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  Subjects -> CHEMISTRY (Total: 841 journals)
    - ANALYTICAL CHEMISTRY (50 journals)
    - CHEMISTRY (593 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
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    - PHYSICAL CHEMISTRY (67 journals)

CHEMISTRY (593 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 34)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 234)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 55)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 69)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 204)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 214)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 2)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 293)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 124)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 98)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 13)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 71)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 176)
Chemical Science     Open Access   (Followers: 22)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 57)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 143)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 260)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 12)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 58)
Dalton Transactions     Full-text available via subscription   (Followers: 22)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)
Environmental Science : Nano     Partially Free   (Followers: 1)
Environmental Toxicology & Chemistry     Hybrid Journal   (Followers: 18)

        1 2 3 | Last

Journal Cover Chemie-Ingenieur-Technik (Cit)
  [SJR: 0.348]   [H-I: 26]   [26 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0009-286X - ISSN (Online) 1522-2640
   Published by John Wiley and Sons Homepage  [1577 journals]
  • Continuous Synthesis of Nanostructured Co3O4@SiO2 Core-Shell Particles in
           a Laminar-Flow Reactor
    • Authors: Angela Straß; Roland Maier, Robert Güttel
      Abstract: The application of a microreactor system for the continuous synthesis of nanostructured Co3O4@SiO2 core-shell particles was investigated and compared to the standard lab experiment in batch operation. TEM images reveal that the synthesis of nanostructured core-shell particles in a laminar-flow reactor is generally possible. However, the particle size distribution for both SiO2 and core-shell particles synthesized continuously in a microreactor is broader, probably due to axial dispersion under laminar-flow conditions.The synthesis of nanostructured core-shell particles is normally carried out batchwise in lab-scale equipment. In this article, the preparation of nanostructured Co3O4@SiO2 core-shell particles using a continuous laminar-flow microreactor is presented. The results demonstrate the principal feasibility of this approach.
      PubDate: 2017-05-02T11:00:45.013199-05:
      DOI: 10.1002/cite.201600162
       
  • Industrielle Herstellung von zeolithischen Molekularsieben / Manufacturing
           of Industrial Zeolite Molecular Sieves
    • Authors: Kristin Gleichmann; Baldur Unger, Alfons Brandt
      Abstract: Zeolithische Molekularsiebe werden seit über 60 Jahren in industriellen Prozessen, hauptsächlich als hoch effiziente Adsorbenzien in Reinigungs- oder Trennprozessen in Gas- oder Flüssigphase eingesetzt. Um den unterschiedlichen Anforderungen in der Endanwendung Genüge zu tun, wurden im Laufe der Zeit unterschiedliche Herstellverfahren für Molekularsiebe entwickelt. In diesem Übersichtsartikel wird anhand von Beispielen der Einfluss von Synthese und/oder Formgebung auf die Eigenschaften hydrophiler, zeolithischer Molekularsiebe in Hinblick auf deren industriellen Anwendungen aufgezeigt und erläutert.Since more than 60 years zeolite molecular sieves are mainly used in industrial processes as high efficient adsorbents in purification or separation processes in gas or liquid phase. As response to the different requirements in the final application different manufacturing processes were developed. In this review the impact of synthesis and/or shaping processes onto the properties of hydrophilic, zeolite molecular sieves with regard to their industrial use are demonstrated and explained on special examples. Thereby zeolite powder, as well as shaped binder-containing and binderless material is considered.Zeolithische Molekularsiebe werden seit über 60 Jahren hauptsächlich als hoch effiziente Adsorbenzien eingesetzt. Anhand von Beispielen wird der Einfluss von Synthese und/oder Formgebung auf die Eigenschaften hydrophiler, zeolithischer Molekularsiebe in Hinblick auf deren industriellen Anwendungen aufgezeigt und erläutert.
      PubDate: 2017-05-02T11:00:21.551219-05:
      DOI: 10.1002/cite.201600164
       
  • Modeling of Water Adsorption in SAPO-34-Coated Aluminum Foam
    • Authors: Sven Bruckner; Thomas Demmer, Markus Ganswind, Dieter Bathen
      Abstract: After presenting the most promising continuous adsorption cooling topology for air-conditioning of a passenger cabin, a transient, 3D model is proposed, based on a modified linear driving force approach, to simulate an adsorption process in a SAPO-34-coated open-celled aluminum foam. The simulation is executed in ANSYS CFX 15.0 and the additional model equations are implemented through the CFX expression language. As a result the influence of the pore diameter onto the system simulation and the mass transport limitation is shown and the sensitivity concerning the pressure in the gas phase adsorption is confirmed.Much research is conducted to improve the efficiency of thermal powered adsorption refrigeration processes. This study proposes a transient, three-dimensional model, based on a modified linear driving force (LDF) approach, to simulate an adsorption process in a SAPO-34-coated open-celled aluminum foam executing the simulation in ANSYS CFX 15.0.
      PubDate: 2017-05-02T11:00:12.996132-05:
      DOI: 10.1002/cite.201600035
       
  • Fest-Flüssig-Trennung von feindispersen Suspensionen durch
           Pressfiltration bei pulsierendem Überdruck / Solid-Liquid Separation of
           Finely Dispersed Suspensions by Press Filtration under Pulsating
           Overpressure
    • Authors: Oleksandr Shevchenko; Sergej Tynyna
      Abstract: Die Produktivität von Filtrationsanlagen zur Entwässerung von feindispersen Suspensionen lässt sich durch pulsierenden Überdruck erhöhen. Für Suspensionen von marinen organisch-mineralischen Sedimenten wurden Pressfiltrationsprozesse bei statischem und pulsierendem Überdruck untersucht. Der Einfluss des statischen Druckanteils, der Druckamplitudencharakteristik, der Druckschwingungsfrequenz und der Filtrationszeit auf das sich bildende Filtratvolumen wurden bestimmt. Basierend auf dem Darcy-Gesetz wurde ein Modell des Filtrationsprozesses bei statischem Überdruck entwickelt. Bei pulsierendem Überdruck wurden die Experimentplanung und die statistische Datenanalysemethode eingesetzt.The productivity of filtration systems for dewatering of finely dispersed suspensions can be increased by pulsating overpressure. For suspensions of marine organic-mineral sediments, press filtration processes were investigated under static and pulsating overpressure. The influence of the static pressure component, the pressure amplitude characteristic, the pressure vibration frequency, and the filtration time on the volume of filtrate were determined. Based on Darcy's law, a model of the filtration process under static overpressure was developed. For pulsating overpressure, the mathematical theory of experiment planning and the statistical data analysis method were used.Der Pressfiltrationsprozess einer feindispersen Suspension von marinen organisch-mineralischen Sedimenten wird experimentell untersucht. Durch den Einsatz von pulsierendem Überdruck kann die Effizienz der Filteranlagen erheblich gesteigert werden. Dieser Prozess ist noch wenig erforscht und verlangt weitere Untersuchungen.
      PubDate: 2017-05-02T11:00:02.616129-05:
      DOI: 10.1002/cite.201600019
       
  • A Numerical Research on Limits of the Dispersion Model
    • Authors: Feifei Song; Thomas Schmid, Richard Häfeli, Philipp Rudolf von Rohr
      Abstract: The axial dispersion in tubular reactors is frequently modeled by the dispersion model, which is an analytical solution under the assumption that the vessel dispersion number is sufficiently small. In this study, limits until which the analytical solution is valid are investigated by comparison with the numerical method. The results show that it is applied only if the vessel dispersion number is small enough and the entrance effect of the tracer is avoided. Therefore, an algorithm based on the numerical solution of the control equation of dispersion is proposed, which allows for higher vessel dispersion numbers.For large vessel dispersion numbers, the convolution method for the dispersion model shows a large deviation error. In this work, this deviation is quantitatively investigated, and the limits of vessel dispersion numbers under specific error requirements are shown. At the same time, a numerical method is proposed for large vessel dispersion numbers.
      PubDate: 2017-04-27T19:03:59.211423-05:
      DOI: 10.1002/cite.201600024
       
  • Katalysatorscreening und Reaktormodellierung für die oxidative
           Methankopplung zur Brennwertanhebung von Biogas / Catalyst Screening and
           Reactor Modeling for Oxidative Methane Coupling to Increase the Heating
           Value of Biogas
    • Authors: Marcus Friedel; Jörg Nitzsche, Hartmut Krause
      Abstract: Die Einspeisung von Biogas in das Erdgasnetz kann einen entscheidenden Anteil zum Gelingen der Energiewende beitragen, da Biogas hierdurch für verschiedene Sektoren (Mobilität, Industrie und Gaskraftwerke) nutzbar wird. Die in der Regel vor der Einspeisung durchgeführte Brennwertanhebung mit Flüssiggas verursacht jedoch hohe Kosten und Abhängigkeiten von fossilen Energieträgern. Um eine unabhängige Brennwertanhebung zu ermöglichen wird derzeit das Verfahren der oxidativen Kopplung von Methan zur Erzeugung höherer Kohlenwasserstoffe aus Biogas untersucht.The feed of biogas into the natural gas grid contributes to the success of the energy transition from fossil and nuclear fuels to renewables, because the usage of fed-in biogas is highly diversified. But the necessary admixture of liquefied petroleum gas (LPG) to increase the heating value results in high costs and in a dependency on fossil fuels. Currently, the process of the oxidative coupling of methane to produce higher hydrocarbons from biogas, whereby an independent increase of the heating value will be possible, is investigated.Durch neue Reaktorkonzepte und Katalysatoren, wird das Verfahren der oxidativen Kopplung von Methan (OCM) weiterentwickelt, um höhere Kohlenwasserstoffe direkt aus biogasstämmigen Methan zur Biogaskonditionierung zu erzeugen. Dadurch soll die bisher durchgeführte Brennwertanhebung mit kostenintensiven und fossilen Flüssiggas ersetzt werden.
      PubDate: 2017-04-27T18:56:21.526813-05:
      DOI: 10.1002/cite.201600018
       
  • Between the Poles of Data-Driven and Mechanistic Modeling for Process
           Operation
    • Authors: Dörte Solle; Bernd Hitzmann, Christoph Herwig, Manuel Pereira Remelhe, Sophia Ulonska, Lynn Wuerth, Adrian Prata, Thomas Steckenreiter
      Abstract: The best method for process control is the use of model-based solutions, based on process analytical technology for online monitoring of critical process variables, product quality attributes, or a holistic process state estimation. Mechanistic models as well as data-driven techniques are essential for real-time process monitoring. Their main characteristics, advantages and disadvantages, and the link between both are discussed as well as the synergetic effects, benefits, and drawbacks resulting from their combination. Aspects and differences of the computational model life cycle management are highlighted.Based on process analytical technology an optimal control of processes can be achieved. Mechanistic as well as data-driven models are essential for real-time process monitoring, as not all process variables can be measured directly. Here the main characteristics of these models as well as their advantages and disadvantages are discussed.
      PubDate: 2017-04-06T08:20:44.655359-05:
      DOI: 10.1002/cite.201600175
       
  • Thermal Energy Storage Integration Based on Pinch Analysis –
           Methodology and Application
    • Authors: Donald Olsen; Peter Liem, Yasmina Abdelouadoud, Beat Wellig
      Abstract: Reducing thermal energy use in industry is an effective way to improve energy efficiency. Process integration methods tackle this challenge, of which pinch analysis is a popular approach for identifying direct heat recovery measures. Many processes are batch processes that can profit from indirect heat recovery using thermal energy storage (TES). This paper presents a systematic conceptual TES integration methodology. In addition, functionality to support this methodology has been implemented in the PinCH software and is presented in a case study.Thermal energy storage is important for improving heat integration in batch processes. To reduce energy consumption in such processes, practical tools for conceptual design are required. The PinCH software has been extended to include unique feature support based on the indirect source/sink profile to aid in the design of heat exchangers and storage networks based on pinch analysis.
      PubDate: 2017-04-05T09:00:54.826243-05:
      DOI: 10.1002/cite.201600103
       
  • One-Step Synthesis of MIL-53(Al)/Boehmite Composites
    • Authors: Johannes Schwegler; Marcus Fischer, Carolin Paula, Peter S. Schulz, Martin Hartmann
      Abstract: [EMIM][Hbdc] and [EMIM]2[bdc] were synthesized and successfully used in a one-step synthesis procedure of MIL-53(Al)/boehmite composites with unusual properties. The breathing effect typically observed for MIL-53(Al) is not found and scanning electron microscopy confirms the presence of MIL-53 nanoparticles in a boehmite matrix. The completely different characteristics of this MIL-53 samples in comparison to hydrothermally synthesized MIL-53(Al) clearly demonstrate the tremendous influence of variations of the reagents used for the syntheses of metal-organic framework materials.[EMIM][Hbdc] and [EMIM]2[bdc], two new versatile linker precursors for terephthalate-based metal-organic frameworks were synthesized and successfully used for the synthesis of MIL-53(Al)/boehmite composites. The MIL-53 component can be directly formed in the large pore, the high-temperature form depending on the choice of the precursor and the synthesis temperature.
      PubDate: 2017-04-05T09:00:50.982994-05:
      DOI: 10.1002/cite.201700002
       
  • Optimierungsbasierte Prozesssynthese auf Basis eines kommerziellen
           Flowsheet-Simulators / Optimization-Based Process Synthesis Based on a
           Commercial Flowsheet Simulator
    • Authors: Tim Janus; Christophe Foussette, Maren Urselmann, Stephen Tlatlik, Axel Gottschalk, Michael Emmerich, Thomas Bäck, Sebastian Engell
      Abstract: Anhand von Simulationen mit einem kommerziellen Fließbildsimulator werden optimierte Fließbilder generiert. Da der Simulator keine expliziten Gleichungen und keine Ableitungen zur Verfügung stellt, wird ein memetischer Algorithmus eingesetzt. Dieser kombiniert einen evolutionären Algorithmus mit einer lokalen ableitungsfreien Suche. Es werden diskrete Designvariablen und kontinuierliche Parameter optimiert. Anhand eines Fallbeispiels wird das Verhalten des Optimierers demonstriert. Von Experten vorgeschlagene Startlösungen können deutlich verbessert werden, allerdings ist der Rechenzeitbedarf für komplexere Fließbilder noch relativ hoch.Based on simulations with a commercial flowsheet simulator, optimized flowsheets are generated. Since the simulator does not provide explicit equations or derivatives, a memetic algorithm is used. This algorithm combines an evolutionary algorithm with a local derivative-free search. Discrete design variables and continuous parameters are optimized. Based on a case study, the behavior of the optimizer is demonstrated. Initial solutions generated by experts can be improved significantly by this approach but the computational time for complex flowsheets is still relatively high.Der Beitrag beschreibt die Realisierung eines Optimierungswerkzeugs zur Generierung optimaler Prozessfließbilder auf der Grundlage von Simulationen mit einem kommerziellen Fließbildsimulator. Die Optimierung erfolgt mit einem memetischen Algorithmus. Zur Auswertung der Lösungskandidaten wird die blockorientierte Fließbildsimulation aufgerufen.
      PubDate: 2017-04-05T09:00:49.020475-05:
      DOI: 10.1002/cite.201600179
       
  • Design of Dividing-Wall Columns by Mixed-Integer Nonlinear Programming
           Optimization
    • Authors: Meik B. Franke
      Abstract: Dividing-wall columns (DWCs) offer an interesting alternative to conventional distillation towers. Savings of up to 30 % in both energy and capital cost are reported. While these high savings are realistic in some applications, DWCs offer less or no advantage at all in other applications. In any case, it is important to make a fair comparison between the conventional system and the DWC based on an optimized process design. Mixed-integer nonlinear programming (MINLP), especially the presented modified Generalized Benders Decomposition approach, could be the tool to make this comparison, as shown here.The design of dividing-wall columns is a difficult task, because a large number of degrees of freedom has to be fixed. Mixed-integer nonlinear programming (MINLP), especially the presented modified Generalized Benders Decomposition approach, is able to solve these demanding optimization problems, as shown by means of three industrial case studies.
      PubDate: 2017-04-05T09:00:47.043226-05:
      DOI: 10.1002/cite.201700005
       
  • A Blueprint for Software Architectures in Process Optimization
    • Authors: Armin Fricke; Jan Christian Schöneberger
      Abstract: How to use software effectively and efficiently in the chemical, pharmaceutical and life science industries is one of the central questions in Process Optimization. The paper shows in five examples from chemical engineering how various programs connect to a first principle process simulator through the existing interfaces. It also shows how the functionality of a process simulator can be enhanced. Through the application programming interface (CC-API), the objects are re-used beyond the boundaries of the flow sheeting program CHEMCAD.Combining different software packages for process optimization can be a challenge: Software interfaces and data structures often don't match. The paper suggests software design principles, which process engineers could recommend the software vendors to follow and proposes a way to build software solutions for process optimization.
      PubDate: 2017-04-05T08:50:49.379249-05:
      DOI: 10.1002/cite.201600130
       
  • Anaerobic Digestion Model (AM2) for the Description of Biogas Processes at
           Dynamic Feedstock Loading Rates
    • Authors: Juan A. Arzate; Max Kirstein, Funda C. Ertem, Erich Kielhorn, Howard Ramirez Malule, Peter Neubauer, M. Nicolas Cruz-Bournazou, Stefan Junne
      Abstract: The anaerobic digestion of biomass is a complex, dynamic, and highly nonlinear process. Hence, a mathematical model that is capable of describing the complete operability region with sufficient accuracy cannot be identifiable even with the most advanced process monitoring technology. The complexity of the anaerobic digestion model no. 1 (ADM1) leads to the application of either parameter-reduced versions of the ADM1 or simpler models as, e.g., the anaerobic digestion model AM2. A comparative study for the simulation of biogas formation at dynamic feedstock loading using maize silage was performed with both models.The anaerobic digestion under dynamic loading rates was simulated with the anaerobic digestion model no. 1 (ADM1) and the anaerobic digestion model AM2 in a comparative study with maize silage as feedstock. It is shown that the AM2 is well applicable with only 6 states, which is beneficial at the typically limited monitoring capacities at biogas plants.
      PubDate: 2017-04-05T08:50:42.499406-05:
      DOI: 10.1002/cite.201600176
       
  • MOSAIC – Enabling Large-Scale Equation-Based Flow Sheet Optimization
    • Authors: Erik Esche; Christian Hoffmann, Markus Illner, David Müller, Sandra Fillinger, Gregor Tolksdorf, Henning Bonart, Günter Wozny, Jens-Uwe Repke
      Abstract: Dedicated software exists for both process simulation and optimization. Given the advantages of simultaneous optimization schemes, engineers are frequently tasked with reimplementing their simulation models in optimization languages or environments. In this contribution, a workflow is introduced to model chemical engineering models in MathML and to have an automatic code generation for both specialized simulation and optimization tools. Two examples are given to highlight the performance of this workflow implemented in the modeling, simulation, and optimization environment MOSAIC.A workflow for the simultaneous optimization of large and complex chemical engineering problems is introduced. The applicability of the workflow implemented in MOSAIC is exemplified for the process synthesis problem of the oxidative coupling of methane and a data reconciliation problem for the hydroformylation of long-chained olefins.
      PubDate: 2017-04-05T08:45:45.538338-05:
      DOI: 10.1002/cite.201600114
       
  • Hydratisierung von Cyclohexen zu Cyclohexanol unter Verwendung von H-ZSM5
           als Katalysator / Hydration of Cyclohexene into Cyclohexanol using H-ZSM5
           as Catalyst
    • Authors: Hendrik Spod; Martin Lucas, Peter Claus
      Abstract: Um die Wettbewerbsfähigkeit aufrecht zu erhalten gilt es Prozesse stetig zu optimieren. Polyamide gehören zu den verbreitetsten Kunststoffen weltweit und finden vor allem als Synthesefasern ihre Anwendung. Untersucht wird eine alternative Teilreaktion in der Produktion von Adipinsäure, die Flüssigphasenhydratisierung von Cyclohexen zu Cyclohexanol, unter Verwendung des Zeolithen H-ZSM5 als Katalysator. Mit einem Si/Al-Verhältnis von 28 weist er im optimalen Reaktionsfenster die beste Performance hinsichtlich der Selektivität und Aktivität zu Cyclohexanol auf, wodurch eine maximale Ausbeute von 13 % erreicht wird.In order to maintain competitiveness, it is important to constantly optimize processes. Polyamides are among the most widely used synthetics in the world and are used mainly as synthetic fibres in the textile industry. An alternative partial reaction is investigated in the production of adipic acid, the liquid phase hydrationn of cyclohexene to cyclohexanol, using the zeolite H-ZSM5 as a catalyst. With a Si/Al ratio of 28 it was found to offer the best performance regarding selectivity and activity under optimized reaction conditions resulting in cyclohexanol yields of 13 %.Die Bildung von Cyclohexanol über Cyclohexen stellt einen Teil einer alternativen, ökonomischeren Syntheseroute zur Gewinnung der wichtigen Polyamide Nylon 6 sowie Nylon 6.6 dar. Gezeigt werden die Ergebnisse der Flüssigphasenhydratisierung von Cyclohexen unter Verwendung von H-ZSM5 als Katalysator.
      PubDate: 2017-04-05T08:40:48.038767-05:
      DOI: 10.1002/cite.201600160
       
  • Application of Advanced Exergetic Analysis for the Improvement of Chemical
           Processes
    • Authors: Mathias Penkuhn; George Tsatsaronis
      Abstract: The exergy concept addresses the synthesis, design, and optimization of processes in which matter and energy are converted. While a conventional exergy analysis identifies the location, magnitude, and causes of thermodynamic inefficiencies within a system, the concept of advanced exergetic analysis provides the opportunity to reveal the structural interdependencies of the system components and to estimate the thermodynamic improvement potential of the most components. The capabilities of an advanced exergetic analysis are demonstrated using the hydrodealkylation process of toluene as an example.Identifying potential improvement options is a crucial task for optimizing energy-intensive chemical processes. Using the information provided by an advanced exergetic analysis it is possible to identify the structural interdependencies and the improvement potential of system components.
      PubDate: 2017-03-31T03:01:06.932493-05:
      DOI: 10.1002/cite.201600113
       
  • Prozessoptimierung am Beispiel der Methanolsynthese mithilfe
           verschiedener lokaler Optimierungsalgorithmen / Process Optimization of
           the Methanol Synthesis Using Different Local Optimization Algorithms
    • Authors: Johannes Sundberg; Sebastian Rehfeldt, Andreas Peschel, Harald Klein
      Abstract: Prozessoptimierung wird oft mit wenig flexibler Optimierungsfunktionalität in Prozesssimulatoren oder nach zeitintensiver Modellierung und Implementierung in algebraischen Modellierungssprachen durchgeführt. Der in dieser Arbeit angewandte hybride Ansatz nutzt Vorteile beider Methoden: MATLAB wird als Optimierungsplattform mit dem Prozesssimulator UniSim Design gekoppelt. Der Ansatz wird am Beispiel der industriellen Methanolsynthese evaluiert. Für die Optimierung werden gradientenbasierte und ableitungsfreie Algorithmen angewendet und so bestehende Arbeiten auf dem Gebiet sinnvoll ergänzt.Process optimization is often performed using process simulators with limited optimization functionality or algebraic modelling languages, which require time consuming model formulation and implementation. Here a hybrid approach is chosen as an alternative, which uses advantages of both methods: MATLAB as an optimization platform is coupled with the process simulator UniSim Design. The approach is evaluated using the example of the industrial methanol synthesis. For the optimization, gradient-based and derivative-free algorithms are applied and thereby existing work in this field is extended reasonably.Die Leistungsfähigkeit des vorgestellten hybriden Ansatzes zur Prozessoptimierung wird am Beispiel der großtechnischen Methanolsynthese gezeigt. Besonderheiten bei der praktischen Anwendung werden diskutiert und bestehende Arbeiten auf diesem Gebiet durch die Anwendung gradientenbasierter und ableitungsfreier Algorithmen zur Optimierung sinnvoll ergänzt.
      PubDate: 2017-03-31T03:00:43.815725-05:
      DOI: 10.1002/cite.201600108
       
  • Hydroisomerisierung von langkettigen n-Alkanen an bifunktionellen
           Zeolith-Katalysatoren / Hydroisomerization of Long-Chain n-Alkanes on
           Bifunctional Zeolite Catalysts
    • Authors: Christopher Zschiesche; Dieter Himsl, Rainer Rakoczy, Andreas Reitzmann, Jens Freiding, Nicole Wilde, Roger Gläser
      Abstract: Die Hydroisomerisierung eines C10 – C13-n-Alkangemisches wurde an sechs bifunktionellen, platinhaltigen Zeolith-Katalysatoren mit 10- und 12-Ring-Porensystemen untersucht. Die Katalysatoren mit 12-Ring-Porensystemen zeigen eine höhere Aktivität als die mit 10-Ring-Porensystemen. Dagegen werden an den 10-Ring-Zeolithen aufgrund formselektiver Eigenschaften höhere Ausbeuten an den gewünschten einfach verzweigten Isomeren erhalten. Für die 10-Ring-Zeolithe werden jedoch höhere Reaktionstemperaturen für das Erreichen der maximalen Isomerenausbeuten benötigt. Dies führt im Vergleich zu den 12-Ring-Zeolithen zu mehr Spaltprodukten.The hydroisomerization of a C10 – C13 n-alkane mixture was investigated over six bifunctional platinum-containing zeolite catalysts with 10- and 12-membered ring pore systems. The catalysts with 12-membered-ring zeolites are more active than those with 10-membered-ring zeolites. In Contrast, higher yields of the desired mono-branched isomers are obtained on the 10-membered-ring zeolites due to shape-selectivity effects. For the 10-membered-ring zeolites, higher reaction temperatures are required for achieving the maximum isomer yields, which leads to more cracking products compared to the 12-membered-ring zeolites.Die formselektiven Eigenschaften von bifunktionellen, platinhaltigen Zeolith-Katalysatoren lassen sich für die Hydroisomerisierung langkettiger C10 – C13-n-Alkane nutzen. Zeolithe mit 12-Ring-Porensystemen zeigen gegenüber denjenigen mit 10-Ring-Porensystemen eine höhere Aktivität. An Letzteren werden höhere Ausbeuten an den gewünschten einfach verzweigten Isomeren erhalten.
      PubDate: 2017-03-23T02:45:29.604122-05:
      DOI: 10.1002/cite.201600165
       
  • Experimental Study on the Influence of Hydrogel on CO2 Hydrate Formation
    • Authors: Bärbel Egenolf-Jonkmanns; Georg Janicki, Stefano Bruzzano, Görge Deerberg, Didier Dalmazzone, Walter Fürst
      Abstract: The influence of two differently cross-linked polyacrylate particles on CO2 hydrate formation was investigated. A series of up-scaling experiments from small (high-pressure differential scanning calorimetry, HP-DSC) over medium (glass reactor) to large scale (HP-reactor) was carried out. It was found out that there is a low influence on the induction time, which is an essential key parameter of the hydrate formation. The results show the same trends: with a low degree of cross-linker used in low concentration CO2 hydrate formation could be enhanced.CO2 hydrate formation was studied within series of up-scaling experiments using hydrogel additives with different content of cross-linker. The targeted use of weakly cross-linked hydrogels enhances the CO2 hydrate formation and makes CO2 hydrate slurries interesting as process fluids in climate cooling systems and for the development of further innovative applications.
      PubDate: 2017-03-22T09:22:35.09286-05:0
      DOI: 10.1002/cite.201600064
       
  • Dynamische Optimierung mit einem Fließbildsimulator am Beispiel der
           Minimierung von Produktwechselzeiten / Dynamic Optimization with a
           Flowsheet Simulator Using the Example of Minimization of Product
           Changeover Times
    • Authors: Jan Christian Schöneberger; Armin Fricke
      Abstract: Zur Ermittlung optimaler Trajektorien der Stellgrößen beim Produktwechsel in einer zweistufigen oleochemischen Destillationsanlage wird das dynamische Prozessmodell im Fließbildsimulator CHEMCAD über eine OPC-Schnittstelle mit der Entwicklungsumgebung Matlab gekoppelt. Nach der Einführung des dynamischen Prozessmodells werden verschiedene Optimierungsstrategien zur Lösung des Problems vorgestellt, verglichen und zu einer hybriden Strategie zusammengeführt. Abschließend wird das so gefundene lokale Optimum des dynamischen Optimierungsproblems visualisiert, analysiert und interpretiert.In order to optimize the trajectories of the control variables for a product changeover in a two-step oleochemical distillation plant the flowsheet simulator CHEMCAD is coupled via its OPC interface with the programming environment Matlab. After the introduction of the dynamic process model different optimization strategies are introduced, compared, and finally combined to a hybrid optimization framework. The local optimum found with this framework is visualized, analyzed, and interpreted from an engineer's viewpoint.Die Minimierung von Produktwechselzeiten in Multifunktionsanlagen ist häufig mit einer direkten Gewinnsteigerung beim Betrieb solcher Anlagen verbunden. Um optimale Trajektorien für die Betriebsparameter bei der Umstellung zu finden muss ein dynamisches Optimierungsproblem formuliert und behandelt werden.
      PubDate: 2017-03-22T09:22:31.251591-05:
      DOI: 10.1002/cite.201600115
       
  • Adsorption of Cyclic Hydrocarbons on Silica Alumnia Gels in Natural Gas
           Processing
    • Authors: Frederik Berg; Christoph Pasel, Michael Luckas, Tobias Eckardt, Dieter Bathen
      Abstract: To ensure the technical use of natural gas it is necessary to remove heavy (cyclic) hydrocarbons from the crude gas. In this article the adsorption of two cyclic hydrocarbons in a N2-carrier gas is investigated on two commercial silica alumina gels. Adsorption isotherms are determined from cumulative breakthrough experiments in a fixed-bed adsorber. The isosteric heat of adsorption is calculated from the temperature-dependent isotherms. The experimental data is discussed regarding the molecular structure of the adsorptive agents as well as surface chemistry and pore structure of the adsorbents.Adsorption isotherms and isosteric heats of the adsorption of benzene and cyclohexane on commercial silica alumina gels, which are used in natural gas processing, are shown. Based on measured data mechanisms and interactions of the adsorption process are discussed.
      PubDate: 2017-03-22T09:22:21.380655-05:
      DOI: 10.1002/cite.201600183
       
  • Operational Criteria for the Separation of Alkanes by Zeolite Membranes
    • Authors: Radostina Dragomirova; Majid Namayandeh Jorabchi, Dietmar Paschek, Sebastian Wohlrab
      Abstract: Operational criteria for the adsorption based separation of alkanes by MFI zeolite membranes were evaluated using the model system n-butane in methane. The influence of operation parameters is rather case sensitive and the separation is determined by the interplay between mobility of adsorbed molecules across the membrane and the depletion of the preferred adsorptive agent, n-butane, along the membrane. Different aspects in the operational design for the separation of alkanes by zeolite membranes were illuminated, namely separation task, stationarity, and membrane surface.Conventional separation processes play an essential role in chemical industry. Therefore, operational criteria, e.g., process parameters and process design, for the adsorption based separation of alkanes by MFI zeolite membranes were evaluated using a model system of n-butane in methane. A rather case sensitive behavior was found.
      PubDate: 2017-03-22T09:07:16.159201-05:
      DOI: 10.1002/cite.201600178
       
  • Optimal Design of Laboratory and Pilot-Plant Experiments Using
           Multiobjective Optimization
    • Authors: Esther Forte; Erik Harbou, Jakob Burger, Norbert Asprion, Michael Bortz
      Abstract: Performing an experimental design prior to the collection of data is in most circumstances important to ensure efficiency. The focus of this work is the combination of model-based and statistical approaches to optimal design of experiments. The knowledge encoded in the model is used to identify the most interesting range for the experiments via a Pareto optimization of the most important conflicting objectives. Analysis of the trade-offs found is in itself useful to design an experimental plan. This can be complemented using a factorial design in the most interesting part of the Pareto frontier.The capabilities of multiobjective optimization in the field of model-based experimental design are demonstrated at laboratory and pilot-plant scale using three case studies. Different types of conflicting objectives are considered and it is shown that the calculation of the Pareto frontier provides useful information for the selection of the most interesting range of experimental conditions.
      PubDate: 2017-03-02T07:50:29.269434-05:
      DOI: 10.1002/cite.201600104
       
  • Conceptual Design of Highly Integrated Processes – Optimization of
           Dividing Wall Columns
    • Authors: Thomas Waltermann; Mirko Skiborowski
      Abstract: Process intensification provides a whole toolbox of innovative solutions for improved energy efficiency of chemical processes. However, evaluation of this potential is hampered by the unavailability of suitable models and design tools. Integrated processes like dividing wall columns either have to be mapped by available unit operation models or tailored equation-based models have to be developed. The current article reviews available methods for conceptual design and optimization of dividing wall columns and provides a detailed comparison of two representative optimization approaches.A consistent consideration of intensified process options requires suitable models and tools for process design and optimization. Since appropriate models and optimization capabilities are yet limited, available methods for the conceptual design of dividing wall columns are reviewed and the benefits of tailored models for process optimization are illustrated.
      PubDate: 2017-02-07T09:50:35.271011-05:
      DOI: 10.1002/cite.201600128
       
  • Planungsansatz für modulare Anlagen in der chemischen Industrie /
           Planning Approach for Modular Plants in the Chemical Industry
    • Authors: Christoph Fleischer-Trebes; Nicolai Krasberg, Christian Bramsiepe, Norbert Kockmann
      Abstract: Modulare Produktionsanlagen werden bei der Planung von neuen Anlagen in Betracht gezogen, sobald diese schnell geplant werden und den Charakter von wandlungsfähigen, flexiblen Anlagen mit sich bringen sollen. Hier wird ein modulbasierter Planungsansatz vorgestellt, mit dessen Hilfe die Planung von neuen, modular aufgebauten Anlagen strukturiert und zeiteffizient durchgeführt werden kann. Dabei werden alle zum Bau benötigten Dokumente von Modulen in einer Process Equipment Design Dokumentation hinterlegt, die projektübergreifend zur Wiederverwendung zur Verfügung steht.Modularly built production plants are considered for planning new chemical plants, in case they shall be designed quickly and transformable, flexible plants are required. To date, these plants are planned mostly by the conventional planning process, so that time saving is not achieved. This paper presents a module based planning approach, which allows a structured planning of new modular plants in a time-efficient way. All required documents for building modules are stored in the Process Equipment Design documentation, which is available for re-use in future projects.Damit Zeiteinsparungen bei der Planung modularer Produktionsanlagen erzielt werden können, muss ein Planungsansatz für diesen innovativen Anlagentyp entwickelt werden. Der in diesem Beitrag vorgestellte modulbasierte Planungsansatz beschreibt, wie Know-how in Form wiederverwendbarer Ingenieursleistungen projektübergreifend angewendet werden kann.
      PubDate: 2017-02-01T09:05:54.028454-05:
      DOI: 10.1002/cite.201600083
       
  • Titelbild Chem. Ing. Tech. 5/2017
    • Pages: 501 - 501
      Abstract: Process optimization is the high end of process engineering. Beyond experience, it requires methods, tools, and knowledge about physical properties and phenomena to identify the sweet spot for an optimization strategy. Process optimization is a team endeavor of process operators, equipment manufacturers, engineering, procurement and construction contractors, software vendors, and research institutes. It even changes the way process engineers work and may require all of these organizations to modify their activities to deliver a constant stream of innovation. Software is the key to this innovation. How to use software effectively and efficiently in the chemical, pharmaceutical, and life science industries is one of the central questions in Process optimization.
      PubDate: 2017-04-24T06:32:38.362994-05:
      DOI: 10.1002/cite.201770051
       
  • „Ist das jetzt der optimale Prozess?” fragte der Kaufmann.
           „Vermutlich nicht” antwortete der Ingenieur.
    • Authors: Armin Fricke
      Pages: 503 - 503
      Abstract: No abstract.
      PubDate: 2017-04-24T06:32:38.209503-05:
      DOI: 10.1002/cite.201770052
       
  • Inhalt: Chem. Ing. Tech. 5/2017
    • Pages: 504 - 507
      PubDate: 2017-04-24T06:32:34.631837-05:
      DOI: 10.1002/cite.201770053
       
  • GDCh: Chem. Ing. Tech. 5/2017
    • Pages: 508 - 509
      PubDate: 2017-04-24T06:32:38.837164-05:
      DOI: 10.1002/cite.201770054
       
  • Forum: Chem. Ing. Tech. 5/2017
    • Pages: 510 - 511
      PubDate: 2017-04-24T06:32:35.375924-05:
      DOI: 10.1002/cite.201770055
       
  • Market-Based Coordination of Shared Resources in Cyber-physical Production
           Sites
    • Authors: Simon Wenzel; Radoslav Paulen, Benedikt Beisheim, Stefan Krämer, Sebastian Engell
      Pages: 636 - 644
      Abstract: Large interconnected production sites typically consist of many plants that are physically coupled by networks of shared resources. An optimal site-wide allocation of shared resources is key to a resource-, energy-, and cost-optimal operation. Market-based coordination can find the site-wide optimum with limited data exchange between the subsystems and thus ensures confidentiality. In this contribution, market-based coordination is applied to a simulation study of a petrochemical production site with steam and intermediate products as shared resources.Market-based coordination strategies can balance flows of material and energy in shared-resource networks between individual autonomous production plants. The distributed approach optimizes energy and resource efficiency by finding the optimal operating point of the site and ensures a high level of confidentiality.
      PubDate: 2017-04-24T06:32:37.85405-05:0
      DOI: 10.1002/cite.201700007
       
  • Vorschau: Chem. Ing. Tech. 6/2017
    • Pages: 698 - 698
      PubDate: 2017-04-24T06:32:34.739951-05:
      DOI: 10.1002/cite.201770056
       
  • Überblick Inhalt: Chem. Eng. Technol. 5/2017
    • Pages: 699 - 699
      PubDate: 2017-04-24T06:32:38.920419-05:
      DOI: 10.1002/cite.201770057
       
  • Hochaufgelöste computertomographische Messungen der Fluiddynamik in
           Füllkörperschüttungen / Measurement of Fluid Dynamics in Random
           Packings Using High-Resolution Computed Tomography
    • Authors: Sebastian Schug; Wolfgang Arlt
      Abstract: Durch Aufnahme computertomographischer Bilder über die Höhe einer Füllkörperkolonne sind lokale und integrale Werte für den Holdup, die benetzte Füllkörperoberfläche und die Stoffaustauschfläche bestimmt worden. Hierfür sind der Raschig Super-Ring, RMSR und Raflux-Ring über einen weiten Betriebsbereich untersucht worden. Die Ergebnisse zeigen große Unterschiede zwischen den drei Füllkörpertypen und lassen sich aufgrund der hohen räumlichen Auflösung der Messtechnik quantifizieren. Die Resultate der integralen Werte sind weitgehend unabhängig von der Füllkörperschüttung und auch nach Neuschüttung der Füllkörper reproduzierbar.Local and integral values for the holdup, the wetted packing surface area and the mass transfer area were determined by taking computed tomography images along a randomly packed column. Therefore, Raschig Super-Ring, RMSR and Raflux-Ring were investigated over a wide range of operating points. The results show a big difference between the three types of random packings and could be quantified through the high spatial resolution of the measuring technique. The presented results of the integral values are largely independent from the random packing itself and are repeatable for a repacking of the column.In diesem Beitrag sind durch hochaufgelöste computertomographische Aufnahmen sowohl integrale, als auch lokale fluiddynamische Parameter in drei Füllkörpertypen bestimmt worden. Insbesondere die benetzte Füllkörperoberfläche und Stoffaustauschfläche konnten bei diesen Untersuchungen quantifiziert werden.
      PubDate: 2016-12-06T03:51:02.803171-05:
      DOI: 10.1002/cite.201600110
       
  • Simulation and Multi-criteria Optimization under Uncertain Model
           Parameters of a Cumene Process
    • Authors: Norbert Asprion; Sergej Blagov, Roger Böttcher, Jan Schwientek, Jakob Burger, Erik von Harbou, Michael Bortz
      Abstract: Since experimentation is expensive with increasing computation power the significance of modeling, simulation, and optimization in process development has grown. Quite often in such models some parameters are uncertain, e.g., due to high variance in experimental data used for their estimation. Methods for investigating the impact of uncertain model parameters in the simulation and a new extension of an adaptive multi-criteria optimization method to account for these uncertainties are described and demonstrated based on a cumene process.The application of methods to investigate the impact of uncertainty on simulation and multi-criteria optimization results is demonstrated and discussed for the cumene process. Results for stochastic and robust optimization are compared with optimization results of individual uncertainty scenarios.
      PubDate: 2016-12-02T05:20:07.241901-05:
      DOI: 10.1002/cite.201600098
       
 
 
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