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CHEMICAL ENGINEERING (235 journals)            First | 1 2     

Showing 201 - 236 of 236 Journals sorted alphabetically
Nanochemistry Research     Open Access   (Followers: 1)
Natural Volatiles & Essential Oils     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 4)
npj Science of Food     Open Access  
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Open Chemical Engineering Journal     Open Access  
Periodica Polytechnica Chemical Engineering     Open Access  
Petroleum Chemistry     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription  
Plasma     Open Access   (Followers: 3)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 2)
Polymer     Hybrid Journal   (Followers: 86)
Polymer Bulletin     Hybrid Journal   (Followers: 6)
Polymer Composites     Hybrid Journal   (Followers: 18)
Polyolefins Journal     Open Access  
Powder Technology     Hybrid Journal   (Followers: 13)
Reaction Chemistry & Engineering     Hybrid Journal  
Reactions     Open Access  
Research on Chemical Intermediates     Hybrid Journal   (Followers: 3)
Revista Cubana de Química     Open Access  
Revista ION     Open Access  
Revista Mexicana de Ingeniería Química     Open Access  
Russian Chemical Bulletin     Hybrid Journal   (Followers: 3)
Russian Journal of Applied Chemistry     Hybrid Journal  
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 3)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 7)
Sustainable Chemical Processes     Open Access   (Followers: 3)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 5)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 3)
Transition Metal Chemistry     Hybrid Journal   (Followers: 6)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Upstream Oil and Gas Technology     Open Access   (Followers: 1)
Visegrad Journal on Bioeconomy and Sustainable Development     Open Access   (Followers: 1)

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Russian Journal of Applied Chemistry
Journal Prestige (SJR): 0.201
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1608-3296 - ISSN (Online) 1070-4272
Published by Springer-Verlag Homepage  [2469 journals]
  • Erratum to: Successive Modification of Montmorillonite with Quaternary
           Alkylammonium Salts of Various Structures as a Method of Preparing
           Nanofillers for in situ Synthesis of Polymer Nanocomposites
           (SILAR)-Deposited CuO Thin Films of Nitrobenzene

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      Abstract: Erratum
      PubDate: 2022-02-01
       
  • Sodium Tetraborate as a Triglyceride Transesterification Catalyst

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      Abstract: The possibility of using Na2В4O7 and Na2В4O7∙10H2O as catalysts for transesterification of triacyl glycerides (with sunflower oil as example) with methanol to obtain biodiesel fuel was examined. At the molar ratio of sunflower oil to methanol of 1 : 12, temperature of 65°С, reaction time of 2 h, and catalyst concentration of up to 5 wt %, the maximal yield of the methyl esters of the fatty acids was 65 and 95% with Na2В4O7∙10H2O and Na2В4O7, respectively. Na2В4O7 can be used as a triglyceride transesterification catalyst no less than three times without appreciable change in the yield of fatty acid methyl esters. Na2В4O7 can be recommended as a catalyst for transesterification involving other esters and alcohols.
      PubDate: 2022-02-01
       
  • Pyrolysis of Polyurethanes. Process Features and Composition of Reaction
           Products

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      Abstract: An increase in the production and consumption of polyurethane products used in heavy and light industry, in the construction industry, automotive, medicine, furniture industry, in the manufacture of sports equipment, brings about the need for their processing and disposal. Incineration of polyurethane waste leads to the release of toxic gases (NOx, HCl, various freons, and fluorine-containing hydrocarbons) and the formation of polycyclic aromatic and heterocyclic compounds, polychlorinated dibenzodioxins and dibenzofurans, and other corrosive-aggressive chlorine-containing compounds. Thermal processing of polyurethanes in an inert atmosphere, i.e., pyrolysis, in contrast to the polymer decomposition in an oxidizing medium, results in the formation of a larger amount of oxygen-containing compounds, which raises the problem of studying the optimal conditions for the polyurethane waste pyrolysis. The formation of halogen- and phosphorus-containing organic compounds, due to the presence of chlorine, fluorine, phosphorus in flame retardant additives that improve the thermostable properties of polyurethanes, significantly reduces the quality of the resulting pyrolysis products, which affects their further use. The review describes the principles and mechanisms of polyurethane degradation. The influence of the polymer structure, the process temperature, the nature of the carrier gas, and the presence of a catalyst on the thermal polyurethane degradation and the formation of products in the gas and condensed phases is considered.
      PubDate: 2022-02-01
       
  • A Mini-Review on Methods of Solvent Extraction Kinetics for Heavy Metal
           Ions

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      Abstract: The solvent extraction can be used in the separation of metal ions from electronic waste, associate mineral and industrial waste containing metals. The investigations of kinetic are important to the optimization and design of reactors for the application of solvent extraction. The research method of solvent extraction kinetics is important to obtain reliable kinetic parameters. Therefore, this paper mainly introduces the typical methods for the solvent extraction kinetics, including single drop method, constant interfacial area cell, microfluidic method, rotating diffusion cell method, AKUFVE method, high speed stirring extraction method, and common extraction experiments. The classical extraction examples, equipment, merits and demerits of these methods were discussed in this paper, which provided useful information for selecting a suitable method with aim of obtaining reliable kinetic parameters for the separation of metal ions.
      PubDate: 2022-02-01
       
  • One-Step Synthesis of a Steel Corrosion Inhibitor,
           1-(2-Neononylamidoethyl)-2-neononyl-2-imidazoline

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      Abstract: 1-(2-Neononylamidoethyl)-2-neononyl-2-imidazoline was synthesized in one step from diethylenetriamine and neodecanoic acid in 55–60% yield. Its structure was confirmed by data of gas–liquid chromatography, mass spectrometry, and UV, IR, and 13C NMR spectroscopy. As shown by UV spectroscopy, the product is resistant to acid hydrolysis. The kinetics of its base hydrolysis in 50% aqueous isopropanol at 25–75°С and рН 12.5 was studied. The inhibiting effect of 1-(2-neononylamidoethyl)-2-neononyl-2-imidazoline on the corrosion of St3 low-carbon steel in 2.0 М sulfuric acid and in 1.0 and 4.8 М hydrochloric acid was studied; the degree of protection was 90–94%.
      PubDate: 2022-02-01
       
  • Product of the Reaction of Activated Industrial Aluminum Alloys with Water
           as a Precursor of a Catalyst Support

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      Abstract: Products of the reaction of water with technical aluminum alloys activated with Ga–In eutectic were obtained. The major impurities in the aluminum hydroxide formed are Ga (5 wt %), In, and Cu (0.6–0.7 wt %); Fe, Zn, Ca, Mg, and Mn were also detected in amounts less than 0.1 wt %. A procedure was suggested for purification of the contaminated Ga–In eutectic used for the Al activation with the aim of subsequent reuse of the eutectic. The oxide phase obtained from the synthesized product is γ-Al2O3 modified with Ga and In. It is characterized by the developed surface (surface area ~300 m2 g–1) and mesoporous structure; it can be used as an adsorbent and support for dehydrogenation catalysts. Platinum catalyst on the oxide support obtained is comparable in propane dehydrogenation performance to model systems based on А0 aluminum alloy.
      PubDate: 2022-02-01
       
  • Deposition of PbS Films by Pyrolysis of Atomized Solutions of Lead
           Thiourea Complexes

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      Abstract: The concentration areas of the existence of various coordination compounds in the PbCl2–(NH2)2CS system were determined by plotting the distribution diagrams and diagrams of the prevalence of complex species in the initial solution. As shown by X-ray diffraction analysis, at deposition temperatures of 300–500°С PbS films crystallize in the cubic system, with the unit cell parameter being independent of the deposition temperature. The band gap of the synthesized PbS was determined by optical spectrometry; it is 0.41–0.45 eV for direct allowed transitions.
      PubDate: 2022-02-01
       
  • Modeling of Degassing of Viscoplastic Liquids in a Cylindrical
           Hydrocyclone

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      Abstract: A mathematical model of degassing of viscoplastic liquids in a cylindrical hydrocyclone, taking into account the action of inertia forces and Coriolis forces and the liquid weight added was developed. The system of differential equations in partial derivatives, describing the gasification process, was reduced to a system of common differential equations and was solved by the numerical method. Based on the mathematical model developed, the influence exerted on the degree of removal of gas bubbles by the plasticity number at different values of the separation factor and nonlinearity parameter of the flow curve was analyzed. The results obtained were substantiated physically. They can be used in the development of the equipment for the treatment of drilling fluids and for the oil degassing prior to transportation.
      PubDate: 2022-02-01
       
  • Epoxy Nanocomposites with Metal-Containing Fillers: Synthesis, Structure,
           and Properties

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      Abstract: Recent achievements in the field of the development of preparation methods and study of structure and properties of epoxy nanocomposites with metal-containing fillers are analyzed. The ex situ and in situ methods for preparing epoxy nanocomposites are discussed. Nanocomposites with such fillers as metals, oxides, salts, chalcogenides, quantum dots, and hybrid and multicomponent fillers are considered. The structure of epoxy nanocomposites is analyzed in detail; it is determined by the structure of the matrix, by the type and character of nanoparticle distribution in the volume, and by the thickness and structure of the interfacial layer. The influence of the dimensionality (zero-, one-, two-, or three-dimensional) of metal-containing filler nanoparticles on the structure of the formed epoxy matrix of the nanocomposites is discussed. The dependence of the mechanical properties of epoxy nanocomposites on the interfacial interaction and structure of the matrix is analyzed. The electrophysical, magnetic, thermal, and tribological properties of the epoxy nanocomposites are considered.
      PubDate: 2022-02-01
       
  • A Highly Selective Cr2O3/nano-ZSM-5 Bifunctional Catalysts for CO2
           Hydrogenation to Aromatics

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      Abstract: The direct conversion of CO2 to aromatics is an effective strategy for simultaneously achieving carbon neutrality and its resource utilization. However, it is a great challenge to efficient CO2 conversion to high value-added aromatics due to the chemical inertness and characteristics of multi-path conversion of CO2. In this work, a series of nanosized ZSM-5 zeolites [NZ5(x)] with different acid amount and strength were synthesized by a seed-induced template-free method via changing the initial gel composition. The Cr2O3 nanoparticle was prepared by simple precipitation method. The performance of the Cr2O3/NZ5(x) bifunctional catalysts composed of Cr2O3 and nano-ZSM-5 zeolites with different acidity, and mixed Cr2O3 with NZ5 (50) by different ways in the CO2 hydrogenation reaction was investigated. The Cr2O3/NZ5(50) catalyst with suitable acidity and closest metal-acid site distance exhibit the highest aromatics selectivity of 87.2% among all hydrocarbon products at CO2 single-pass conversion of 13.6%, which is due to the synergistic effect between the acid sites of the nanosized ZSM-5 zeolite and metal sites provide by Cr2O3 with abundant oxygen vacancies.
      PubDate: 2022-02-01
       
  • Synthesis and Antimicrobial Activity of 3-Substituted
           8-Propenylbenzo[e][1,3]oxazines

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      Abstract: A series of 1,3-benzoxazine derivatives were prepared by ternary Mannich condensation of 2-propenylphenol, formaldehyde, and primary amines (aniline, propylamine, hexylamine, and benzylamine). The product structures were confirmed by elemental analysis and by IR and NMR spectroscopy. The antimicrobial activity of the compounds against Staphylococcus aureus (two strains), Escherichia coli, Candida albicans, Shigella flexneri, Salmonella enterica, and Aspergillus niger was evaluated in 5, 15, and 35 mg L–1 solutions. The benzoxazine containing the benzyl fragment shows the best antimicrobial properties. To confirm the antimicrobial activity of the compounds in lower concentrations, serial dilution tests were performed, and the minimal suppressing concentration (0.035 mg L–1) was determined. The ultrastructure of an Escherichia coli cell in the presence of the compound with the benzyl substituent was examined by electron microscopy.
      PubDate: 2022-02-01
       
  • Application of Rare Earth 1,3-Diketonate Derivatives as Radioluminophores

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      Abstract: The possibility of using rare-earth 1,3-diketonate derivatives with the general formula [Ln(L1)4]M and [Ln(L1)3L2] as radioluminophores luminescing under the action of 3H β-particles was proved. Yellow-green (Tb) and red (Eu) phosphors were produced depending on the rare-earth element used. It was found that the studied compounds have an acceptable luminescence brightness for use in the manufacturing radioluminescent light elements.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010037
       
  • Preparation of Nanosized Particles of Cobalt in the Presence of
           Water-Soluble Polymers

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      Abstract: The formation of cobalt particles in the presence of water-soluble polymers of various nature was studied. The use of polyethyleneimine made it possible to prepare a dispersion of cobalt particles with a narrow size distribution. The use of polystyrenesulfonic acid and poly-N-vinylpyrrolidone led to the formation of a dispersion of cobalt particles 1.8–35.0 nm in size. In the presence of polyacrylic acid, particles 3.5–19.5 nm in size are formed, which consist of cobalt oxide and metallic cobalt.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010116
       
  • Synthesis and Properties of TiO2–SiO2/CaO Biomaterials with Spherical
           Particles Based on Tokem-200 Cation Exchange Resin

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      Abstract: Biomaterials based on Tokem-200 cation exchanger containing spherical particles were synthesized from solutions using the sol-gel method. The outer frame of the particles is TiO2–SiO2, the inner part is filled with CaO (TiO2–SiO2/CaO sample). The carboxylic cation exchange resin Tokem-200 is characterized by high selectivity with respect to Ca2+ ions, which makes it possible to use it in the development of biomaterials, since calcium is involved in the formation of bone tissue. Conditions for heat treatment of samples were established to produce a homogeneous structure of the material: heat treatment (drying at 60°C), annealing at 150, 250, 350°C for 30 min at each temperature step, annealing at 600°C for 6 h. It was proposed to use gelatin as a binder additive.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010025
       
  • Properties of Zinc Oxide Adsorbent for Adsorbing Hydrogen Sulfide

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      Abstract: The paper defines the conditions for the synthesis of hydrogen sulfide adsorbent based on zinc oxide from basic zinc carbonate in order to produce strong, porous and non-dusting pellets of a sulfur-adsorbing mass. It is proposed to prepare the adsorbent by mixing nanocrystalline and coarsely dispersed ZnO. It was proven that the introduction of solutions of carboxymethyl cellulose and hydroxypropyl cellulose into the extraction paste makes it possible to reduce the fraction of plastic deformations in the ZnO suspension from 79.8 to 56.1%. In this paper the rheological properties of zinc oxide are investigated. According to the Maxwell–Shvedov and Kelvin model, all the studied systems belong to the fourth structural-mechanical type. Tests of a sulfur adsorbent based on zinc oxide suspensions showed that in the temperature range of 300–400°C in the reaction gas mixture H2S 10%, N2 90%, there are completely no sulfur compounds at the outlet. It has been established that the formability of the ZnO-based paste is possible at an optimum moisture content of 33.4%.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010141
       
  • Epoxy Nanocomposites Modified with Functionalized Multiwalled Carbon
           Nanotubes

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      Abstract: Multiwalled carbon nanotubes were modified by interaction with γ-aminopropyltriethoxysilane and were dispersed in an epoxy compound. The properties of multiwalled carbon nanotubes treated with γ-aminopropyltriethoxysilane were characterized by transmission electron microscopy and by Raman and Fourier IR spectroscopy. Multiwalled carbon nanotubes modified with γ-aminopropyltriethoxysilane are uniformly distributed in the bulk of the epoxy compound. Introduction of modified carbon nanotubes into the epoxy compound initiates curing of the epoxy oligomer and, in addition, leads to reinforcement of epoxy composites: The bending strength increases by 194%, the bending elastic modulus, by 137%, the tensile strength, by 108%, the tensile elastic modulus, by 52%, and the impact resilience, by 300% relative to the plasticized epoxy composite without multiwalled carbon nanotubes.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010104
       
  • New Epoxy Resin Polymerization Catalysts Based on
           N,N-Dimethylaminoalkylamides of Perfluoroalkanoic Acids

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      Abstract: A series of N,N-dimethylaminoalkylamides of perfluorobutanoic and perfluoropentanoic acids were prepared, and the activity of these amides in curing of ED-20 commercial epoxy resin was studied. Data of differential thermal analysis and Fourier IR spectroscopy, taking into account the gel fraction content of the cured composites, show that the curing agent reactivity increases with an increase in the weight fraction of the hydrocarbon moiety and with a decrease in its fluorine content. Evaluation of the adhesion strength in gluing St.3 steel with amide-cured ED-20 epoxy resin shows that all the compounds synthesized ensure two times more efficient gluing compared to the resin cured with the standard curing agent, polyethylenepolyamine. In gluing of D16 aluminum alloy, the gluing efficiency, on the contrary, slightly decreases.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010074
       
  • Photocatalytic Activity of Fluorinated Titanium Dioxide in Ozone
           Decomposition

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      Abstract: Nanocrystalline (~10 nm) fluorinated titanium dioxide was prepared by hydrothermal-microwave treatment. The powder obtained was applied onto the surface of porous quartz glass by impregnation; the TiO2 amount loaded was 0.87 wt %. As shown by in situ measurements, the material obtained exhibits high catalytic activity in ozone decomposition, exceeding that of commercial photocatalysts Hombikat UV100 and Evonik Aeroxide® TiO2 P25 by a factor of more than 1.5.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010153
       
  • Composite Fibers Based on Hydrated Cellulose and Poly-N-vinylpyrrolidone,
           Prepared from Cellulose Solutions in N-Methylmorpholine-N-Oxide

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      Abstract: Hydrophilic composite fibers of various compositions were prepared from mixtures of solid solutions of cellulose in N-methylmorpholine-N-oxide or its monohydrate and poly-N-vinylpyrrolidone after bringing them to the viscous-flow state. The rheological behavior of cellulose–poly-N-vinylpyrrolidone systems in N-methylmorpholine-N-oxide with various water contents was studied. At the poly-N-vinylpyrrolidone content of up to 30 wt % relative to cellulose and a temperature of 100–120°С, the systems under consideration are emulsions whose rheological behavior is determined by specific features of the dispersed phase, character of the interface, and its stability under shear flow. The poly-N-vinylpyrrolidone dispersed phase, as well as its preliminary immobilization on cellulose, does not worsen the rheological properties of the melt, which allows preparation of composite fibers under the conditions similar to those of the formation of hydrated cellulose fibers. The results of studying the fibers by scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry show that the fibers have dense microfibrillar structure without additional ordering caused by the phase interaction; they also demonstrate intense interphase interaction of the components. The mechanical characteristics of the fibers, determined by tensile tests, are comparable to those of hydrated cellulose fibers.
      PubDate: 2022-01-01
      DOI: 10.1134/S107042722201013X
       
  • Successive Modification of Montmorillonite with Quaternary Alkylammonium
           Salts of Various Structures as a Method of Preparing Nanofillers for in
           situ Synthesis of Polymer Nanocomposites

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      Abstract: In accordance with the suggested procedure, the strength characteristics of polymers prepared by radical polymerization of vinyl polymers are enhanced by grafting the monomers to the nanofiller surface. When preparing high-strength polymer–aluminosilicate nanocomposites by radical polymerization in situ, it is appropriate to ensure both grafting of polymer chains to the aluminosilicate surface of the filler (montmorillonite) and hydrophobization of the nanofiller surface. To solve this problem, successive modification of montmorillonite with two quaternary ammonium salts with different properties was studied. Fillers with mixed modifiers were prepared, and their structure was determined. Studies of composites with such fillers confirmed the appropriateness of using the mixture of modifiers for preparing the filler: The nanocomposite based on butyl methacrylate, containing organoclay with the mixed modifier, surpasses in the Young’s modulus both unfilled poly(butyl methacrylate) and composites containing nanoclays with the individual modifiers.
      PubDate: 2022-01-01
      DOI: 10.1134/S1070427222010086
       
 
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