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Publisher: Diponegoro University   (Total: 21 journals)   [Sort by number of followers]

Showing 1 - 21 of 21 Journals sorted alphabetically
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 2, SJR: 0.192, h-index: 6)
Geoplanning : J. of Geomatics and Planning     Open Access   (Followers: 1)
ILMU KELAUTAN : Indonesian J. of Marine Sciences     Open Access   (Followers: 1)
Intl. J. of Renewable Energy Development     Open Access   (Followers: 5)
Intl. J. of Waste Resources     Open Access   (Followers: 4)
Izumi : Jurnal Bahasa, Sastra dan Budaya Jepang     Open Access  
J. of Biomedicine and Translational Research     Open Access  
J. of Coastal Development     Open Access   (Followers: 2)
J. of the Indonesian Tropical Animal Agriculture     Open Access  
Jurnal Anestesiologi Indonesia     Open Access  
Jurnal Ilmu Lingkungan     Open Access   (Followers: 1)
Jurnal Reaktor     Open Access  
Jurnal Sistem Komputer     Open Access   (Followers: 1)
Jurnal Teknologi dan Sistem Komputer     Open Access  
Jurnal Wilayah dan Lingkungan     Open Access   (Followers: 1)
Kapal     Open Access   (Followers: 1)
Nurse Media : J. of Nursing     Open Access  
Parole : J. of Linguistics and Education     Open Access  
Tataloka     Open Access  
Teknik     Open Access  
Waste Technology     Open Access   (Followers: 3)
Journal Cover Jurnal Reaktor
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   ISSN (Print) 0852-0798 - ISSN (Online) 2407-5973
   Published by Diponegoro University Homepage  [21 journals]
  • Bagian Depan Reaktor Vol 17 No. 3 September 2017

    • Authors: W Widayat
      Abstract: Bagian Depan yang meliputi cover, daftar isi, editorial boar dan pengantar dari Redaksi
      PubDate: 2017-10-25
      Issue No: Vol. 17, No. 3 (2017)
       
  • Bagian Belakang Reaktor No. 17 No. 3 September 2017

    • Authors: W Widayat
      Abstract: berisi tentang indeks penulis, objek dan petunjuk penulisan
      PubDate: 2017-10-25
      DOI: 10.14710/reaktor.17.3.xx-xxx
      Issue No: Vol. 17, No. 3 (2017)
       
  • FRACTIONATION OF PHENOLIC COMPOUNDS FROM KAFFIR LIME (Citrus hystrix) PEEL
           EXTRACT AND EVALUATION OF ANTIOXIDANT ACTIVITY

    • Authors: Yusak Adi Wijaya, Daniel Widyadinata, Wenny Irawaty, Aning Ayucitra
      Pages: 111 - 117
      Abstract: Side effects of drug-based treatment observed in patients during degenerative diseases treatments has directed towards to the identification of plants with antioxidant activity. Kaffir lime peel was selected in this study. This work was aimed to investigate the effect of solvent (hexane, ethyl acetate and n-butanol) polarity on the fractionation of ethanolic crude extract and assess its antioxidative property by DPPH radical scavenging assay. The results show semi polar solvent of ethyl acetate exhibited the best solvent to extract phenolic compounds from ethanolic kaffir lime peel with total phenolic content detected was 0.12 mg Gallic Acid Equivalent/mg. The employment of solvents possessing different polarity resulted several fractions, i.e. hexane, ethyl acetate, n-butanol and residue with different type of phenolic compounds in each fraction. Accordingly, each fraction exhibited different antioxidant activity against free radical compound of DPPH. The N-butanol fraction demonstrated the strongest activity which is shown by lowest IC50 value among the fractions tested. The fraction of n-butanol exhibited the IC50 value of 0.44 mg/mL which means that only 0.44 mg of the fraction/mL is required to inhibit the neutralization of DPPH by 50%. Phenolic identification by High Performance Liquid Chromatography indicates the different phenolic compounds in each fraction that contribute to antioxidative property to different extent. Further investigation to identify these phenolic compounds will lead to further development of kaffir lime as natural antioxidant to treat specific degenerative diseases.
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.111-117
      Issue No: Vol. 17, No. 3 (2017)
       
  • PENDUGAAN UMUR SIMPAN KERIPIK PISANG SALUT COKELAT “PURBARASA” KEMASAN
           POLIPROPILEN BERDASARKAN ANGKA TBA DENGAN METODE ASLT MODEL ARRHENIUS
           (SHELF LIFE ESTIMATION OF COCOA POWDER-COATED BANANA CHIPS “PURBARASA”
           IN POLYPROPYLENE PACKAGING BASED ON TBA VALUE USING ARRHENIUS MODEL OF
           ASLT METHOD)

    • Authors: Ervika Rahayu Novita Herawati, Rifa Nurhayati, Mukhamad Angwar
      Pages: 118 - 125
      Abstract: Cocoa powder-coated banana chips "PURBARASA" is a banana chips made from local banana in Nglanggeran Village coated with local cocoa powder. The products are sold using polypropylene packaging with 0,08 mm on thickness. The quality of cocoa powder-coated banana chips "PURBARASA" change during storage such as rancidity which caused by fat in cocoa powder and absorbed oil into banana chips when deep frying processed. Deterioration can affect on its shelf life. The shelf life of cocoa powder-coated banana chips "PURBARASA" still not known yet, so it is really necessary to estimate shelf life of this products in order to comply the requirements of food safety labeling on its package. The method which can be used to estimate the shelf life of cocoa powder-coated banana chips "PURBARASA" is Accelerated Shelf Life Test (ASLT) with Arrhenius model. In this case, the parameter used were based on rancidity using TBA test. Observations of deterioration carried out at three different temperatures 350C, 450C and 550C every 7 days for 42 days. Estimated shelf life of cocoa powder-coated banana chips "PURBARASA" at 10, 25, 28, 300C based on TBA test was 6,2 months, 4,6 months, 4,3 months and 4,2 months respectively.
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.118-125
      Issue No: Vol. 17, No. 3 (2017)
       
  • Optimasi Adsorpsi Ion Mg2+ pada Fixed Bed Column dengan Menggunakan
           Response Surface Methodology

    • Authors: Novi Sylvia, Meriatna Meriatna, Fikri Hasfita, Lukman Hakim
      Pages: 126 - 131
      Abstract: Abstract OPTIMIZATION ADSORPTION OF Mg2+ ION ON FIXED BED COLUMN USING RESPONSE SURFACE METHODOLOGY. Modeling of the adsorption process is used to establish the mathematical relationship between the interacting process variables and process optimization. This is important to determine the factor values that produce a maximum response. Adsorption of Mg from groundwater was optimized using response surface methodology based on Box-Behnken design was used to analyze adsorption data. The process was investigated by continuous experiments. Variables included in the process were: bed depths (7.5, 10, and 12.5 cm), time (20, 40, and 60 min), and flow rate (6, 10, and 14 L/min). Regression analysis was used to analyze the developed models. The outcome of this research showed that 72.784% of the variability in removal efficiency is attributed to the three process variables considered, that is, bed depths, time, and flow rate. Optimization tests showed that the optimum operating conditions for the adsorption process occurred at a bed depth of 11.37 cm, time of 55.53 min and flow rate of 6 L/min. Keywords: adsorption; Box-Behnken design; magnesium (Mg2+); optimization  AbstrakPemodelan dari proses adsorpsi digunakan untuk menentukan hubungan matematis antara variabel proses interaksi dan proses optimasi. Hal ini penting untuk menentukan nilai faktor yang menghasilkan respon maksimum. Adsorpsi magnesium (Mg2+) dari air tanah dioptimalkan menggunakan metodologi respon permukaan model Desain Box-Behnken yang digunakan untuk menganalisis data adsorpsi. Percobaan dilakukan secara kontinyu. Variabel yang termasuk dalam proses tersebut adalah: tinggi unggun (7,5, 10 dan 12,5 cm), waktu kontak (20, 40, dan 60 menit), dan laju alir (6, 10, dan 14 L/menit). Analisis regresi digunakan untuk menganalisis model yang dikembangkan. Hasil penelitian menunjukkan bahwa 72,784% efisiensi penyisihan Mg2+ ditentukan oleh tiga variabel proses, yaitu tinggi unggun, waktu kontak, dan laju alir. Hasil optimasi menunjukkan bahwa kondisi operasi optimum untuk proses adsorpsi terjadi pada tinggi unggun 11,37 cm, waktu kontak 55,53 menit dan laju alir 6 L/menit. Kata kunci: adsorpsi; Box-Behnken desain; magnesium (Mg2+); optimasi
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.126-131
      Issue No: Vol. 17, No. 3 (2017)
       
  • Pemetaan Pengaruh Proses Pengolahan pada Kualitas Biji Kakao Menggunakan
           Metode Metabolik Profiling dengan GC/MS

    • Authors: Hana Nur Fitriana, Ronny Purwadi, Made Tri Ari Penia Kresnowati
      Pages: 132 - 139
      Abstract:  MAPPING THE EFFECTS OF COCOA POST HARVEST PROCESSING ON COCOA BEAN QUALITY BY METABOLIC PROFILING METHOD USING GC/MS. The quality of cocoa is strongly effected by the implemented post harvest processes. The fermented cocoa beans is presumed to have higher quality than the unfermented ones, whereas roasting strongly affects the organoleptic quality of the cocoa products. However, what exactly differentiates those cocoa beans are not known yet. This research was foccused on the mapping of post harvest processing method on the quality of cocoa beans, using metabolic profiling method. Different types of cocoa bean samples, that were fermented, roasted, fermented and roasted, as well as unfermented and unroasted (as control) were analysed by GC-MS. The obtained metabolic profiles were further mapped using Principal Component Analysis (PCA). The results showed that there were significant different on samples processed through different processing methods. The fermentation and roasting of cocoa beans direct the process such that more homogenous metabolic composition were obtained. Kata kunci: cocoa beans; fermentation; metabolomic; PCA; processing; roasting  Abstract Proses pengolahan biji kakao sangat menentukan kualitas kakao yang dihasilkan. Biji kakao terfermentasi diyakini memiliki kualitas yang lebih tinggi dibandingkan biji kakao tanpa fermentasi. Proses penyangraian juga diyakini sangat menentukan kualitas organoleptik produk olahan kakao. Akan tetapi, para pelaku bisnis kakao masih belum mengetahui secara pasti apa yang membedakan hal tersebut. Penelitian ini berfokus pada pemetaan pengaruh proses pengolahan pada kualitas biji kakao, menggunakan metode metabolik profiling. Sampel biji kakao dengan berbagai proses pengolahan: difermentasi, disangrai, difermentasi dan disangrai, serta kontrol (tidak difermentasi dan tidak disangrai) dianalisa dengan GC/MS untuk memetakan komposisi metabolitnya. Spektrum metabolit yang diperoleh kemudian dipetakan menggunakan metode Principal Component Analysis (PCA). Hasil yang diperoleh menunjukkan terdapat perbedaan yang signifikan antara sampel dengan berbagai proses pengolahan tersebut, pengolahan biji kakao yang terdiri dari fermentasi dan penyangraian mengakibatkan komposisi biji kakao yang lebih seragam. Keywords: biji kakao; fermentasi; metabolomik; PCA; pemrosesan; penyangraian
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.132-139
      Issue No: Vol. 17, No. 3 (2017)
       
  • SINTESIS GLISEROL KARBONAT DARI GLISEROL DAN UREA MENGGUNAKAN KATALIS
           RESIN INDION 225 Na

    • Authors: Alfiana Adhitasari, Hary Sulistyo, Agus Prasetya
      Pages: 140 - 144
      Abstract: Abstract KINETIC STUDY OF GLYCEROL CARBONATE SYNTHESIS FROM GLYCEROL AND UREA USING INDION 225 Na AS CATALYST. The using of biodiesel as an alternative energy source that is renewable causes the increasing of glycerol as byproduct of biodiesel production. It makes the selling value of glycerol decreases. Glycerol processing is needed to increase the selling value of glycerol in the market. One of the glycerol derivative is glycerol carbonate. Glycerol carbonate is used as adhesives, solvents, inks, surfactants, and lubricants. This research was carried out by reacting glycerol and urea in a batch reactor using Indion 225 Na as catalyst. The purpose of this study was to determine the best conditions of synthesis of glycerol carbonate. The results showed that the obtained optimum conversion of glycerol was 48.43% with ratereaction is 0.1296 hr-1 and the ativation energy is 17.0628 kJ/mol.K with frequency factor is 19.4199 hr-1 in the glycerol:urea ratio of 1:1, the catalyst concentration of 5% and a temperature of 130 0C in 5h of reaction. Kata kunci: glycerol; glycerol carbonate; indion 225 Na; urea   Abstrak Penggunaan biodiesel sebagai alternatif sumber energi yang bersifat renewable mengakibatkan meningkatnya gliserol sebagai hasil samping produksi biodiesel. Peningkatan produksi gliserol berdampak terhadap nilai jual gliserol yang semakin menurun. Pengolahan gliserol perlu dilakukan untuk meningkatkan nilai jual gliserol di pasaran. Salah satu produk turunan gliserol adalah gliserol karbonat. Gliserol karbonat mempunyai kegunaan sebagai perekat, pelarut, tinta, surfaktan, dan pelumas. Penelitian ini dilakukan dengan mereaksikan gliserol dan urea dalam reaktor batch menggunakan katalis resin Indion 225 Na. Tujuan dari penelitian ini adalah untuk mengetahui kondisi terbaik sintesis gliserol karbonat. Hasil penelitian menunjukkan bahwa konversi gliserol terbaik yang didapatkan sebesar 48,43% dengan nilai konstanta kecepatan reaksi sebesar 0,1296 jam-1 dan nilai Ea sebesar 17,0628 kJ/mol.K dengan nilai faktor frekuensi sebesar 19,4199 jam-1pada perbandingan gliserol:urea 1:1, konsentrasi katalis 5% dan suhu 1300C selama 5 jam reaksi. Keywords: Gliserol; Gliserol Karbonat; Indion 225 Na ; Urea   
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.140-144
      Issue No: Vol. 17, No. 3 (2017)
       
  • Characteristics and Free Radical Scavenging Activity of Zinc Oxide (ZnO)
           Nanoparticles Derived from Extract of Coriander (Coriandrum sativum L.)

    • Authors: Tagor Marsillam Siregar, Antonius Herry Cahyana, Regina Jessilia Gunawan
      Pages: 145 - 150
      Abstract: Abstract Zinc Oxide (ZnO) nanoparticles were recently studied for its free radical scavenging activity.                     The formation of ZnO nanoparticles by means of biological method was known to be a simpler and more environmental friendly method. One of the biological methods used for the formation of ZnO nanoparticles was by utilizing the phytochemicals that were present in a plant extract.                                       The phytochemicals such as phenolic and flavonoid compound was able to reduce bulk metal Zinc into Zinc nanoparticles. Coriander (Coriandrum sativum L.) seeds and leaves were known to contain high amounts of phenolic compounds and flavonoid compounds. The aim of this study was to investigate the effect of different solvent polarities used to extract Coriander leaves and seeds towards the reducing power of plant extract and the free radical scavenging capacity of ZnO nanoparticles. The different solvents that were used to extract Coriander were deionized water, ethyl acetate, and hexane. The different solvent polarities affected the weight of the derived ZnO nanoparticles due to the different types of the extracted phenolic and flavonoid compounds. The different solvent polarities also affected the free radical scavenging capacity of ZnO nanoparticles. Ethyl acetate based extract of Coriander leaf resulted in the most weight of ZnO nanoparticles, 0.7907 g and the highest free radical scavenging capacity, 11.16%/mg ZnO nanoparticles. The free radical scavenging activity of ZnO nanoparticles decreased to 3.67%/mg ZnO nanoparticles after the process of calcination at 100°C and decreases to 0 %/mg ZnO nanoparticles after the process of calcination at 300 and 500°C. The diameter of ZnO particles increases from 128.1±33.5 nm to 552.3±61.1 nm after calcination. Kata kunci: calcination; free radical scavenging capacity; polarities; zinc oxide nanoparticles  Abstrak KARAKTERISTIK DAN AKTIVITAS PENANGKAL RADIKAL BEBAS NANOPARTIKEL SENG OKSIDA (ZnO) YANG DIBENTUK MENGGUNAKAN EKSTRAK KETUMBAR (Coriandrum sativum L.). Nanopartikel Seng Oksida (ZnO) saat ini tengah diteliti sehubungan dengan kapasitasnya dalam menangkal radikal bebas. Metode biologis merupakan metode sederhana dan ramah lingkungan yang dapat digunakan pada pembentukan nanopartikel ZnO. Pemanfaatan senyawa fitokimia dari ekstrak tanaman merupakan salah satu metode biologis yang dapat digunakan pada pembentukan nanopartikel ZnO. Senyawa fitokimia seperti senyawa fenolik dan flavonoid dapat mereduksi logam Seng menjadi nanopartikel Seng. Biji dan daun dari tanaman ketumbar (Coriandrum sativum L.) telah diketahui memiliki kandungan senyawa fenolik dan flavonoid. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh perbedaan polaritas pelarut yang digunakan untuk ekstraksi biji dan daun ketumbar terhadap kapasitas reduksi ekstrak dan penangkal radikal bebas dari nanopartikel ZnO. Pelarut yang digunakan pada ekstraksi biji dan daun ketumbar adalah air deionisasi, etil asetat dan heksana. Perbedaan polaritas pelarut mempengaruhi berat nanopartikel ZnO yang diperoleh, hal ini disebabkan oleh perbedaan jenis senyawa fenolik dan flavonoid yang terekstrak. Perbedaan polaritas pelarut juga mempengaruhi kapasitas penangkal radikal bebas  dari nanopartikel ZnO. Ekstrak etil asetat daun ketumbar menghasilkan nanopartikel ZnO dengan berat 0,7907 g   dan aktivitas penangkal radikal bebas sebesar 11,16%/mg nanopartikel ZnO. Aktivitas penangkal radikal bebas nanopartikel ZnO menurun menjadi 3,67%/mg nanopartikel ZnO setelah dikalsinasi pada suhu 100oC dan menurun menjadi 0%/mg nanopartikel ZnO setelah dikalsinasi pada suhu 300oC, 500oC. Diameter nanopartikel ZnO meningkat dari 128,1±33,5 nm menjadi  552,3±61,1 nm setelah dikalsinasi Keywords: elektrokoagulasi, penurunan warna, penurunan TSS, laju degradasi COD, imbah tekstil
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.145-151
      Issue No: Vol. 17, No. 3 (2017)
       
  • PENAMBAHAN POTASSIUM CHLORIDE PADA BIOPLASTIK PATI SAGU DENGAN BERPENGUAT
           MIKROFIBRIL SELULOSA BAMBU BERBANTUKAN SONIKASI

    • Authors: Silviana Silviana, Puji Rahayu
      Pages: 151 - 156
      Abstract: Sago starch based bioplastics as food packaging have drawbacks such as soft, and easily broken. This paper explains improvement of sago starch-based bioplastics reinforced with bamboo microfibrillated cellulose (MFC). Furthermore, this paper investigates effect of dispersing agent on mechanical property by using of potassium chloride (KCl) assisted by ultrasonic homogenizer. Variable used experiments were bamboo MFC concentration of 1%; 3% and 5% w/w and KCl concentration of 1%; 2% dan 3% w/v. Sago starch-based solution was prepared from 4% w/v of commercial sago starch. The mixed solution was gelatinized at temperature of 90 oC. The result showed that the 5% of bamboo MFC increased tensile strength of sago starch-based bioplastics due to purpose of bamboo MFC as reinforcement of sago starch. Further, additional of KCl reduced the dispersing time for 1 hour. Optimum result in this preliminary experiment was obtained at bamboo MFC of 5% w/w and KCl concentration of 1% w/v resulting tensile strength of 17.99 MPa.
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.152-158
      Issue No: Vol. 17, No. 3 (2017)
       
  • PENENTUAN UMUR SIMPAN MINYAK KELAPA: Pengaruh Penambahan Ekstrak Bahan
           Alami terhadap Laju Oksidasi

    • Authors: Danu Ariono, Maxs Christian, Philip Irfan, Sri Mulyani Suharno, Aisya Tamara
      First page: 157
      Abstract: Abstrak Perkebunan kelapa Indonesia merupakan terbesar di dunia, dengan pangsa 31,2% dari total areal perkebunan kelapa di dunia. Salah satu produk dari kelapa adalah minyak kelapa. Namun, minyak kelapa memiliki umur simpan yang singkat. Oleh karena itu, eksperimen ini bertujuan untuk memperkirakan dan mengoptimasi umur simpan minyak kelapa. Minyak kelapa yang dijadikan sampel eksperimen merupakan minyak yang dibuat berdasarkan metode tradisional. Minyak kelapa yang diuji pada eksperimen ini meliputi minyak kelapa blanko, ditambah potongan wortel, ekstrak cair nanas 10 dan 30 %-v/v, pepaya muda 10 dan 30%-v/v, serta tomat 10 dan 30 %-v/v. Minyak kelapa blanko dan yang ditambah potongan wortel disimpan dalam botol kaca terang dan gelap, sedangkan minyak kelapa yang ditambah ekstrak cair hanya disimpan dalam botol kaca gelap. Metoda perkiraan umur simpan dilakukan berdasarkan nilai-nilai pustaka (literature value) bilangan asam dan bilangan peroksida yang didekati dengan metoda regresi persamaan dan Artificial Neural Network (ANN). Hasil eksperimen menunujukkan bahwa umur simpan minyak kelapa adalah 37-41 hari untuk minyak blanko (dalam botol kaca terang dan gelap), 50-51 hari untuk penambahan potongan wortel dalam botol kaca terang, 56-57 hari untuk penambahan potongan wortel wortel dalam botol kaca gelap, 41-45 hari untuk penambahan ekstrak cair nanas 10%-v/v, 30-32 hari untuk 30%-v/v, 63-64 hari untuk penambahan pepaya muda 10%-v/v, 55-62 hari untuk 30%-v/v, 24-27 hari untuk ekstrak  cair tomat 10%-v/v, serta 17-21 hari untuk 30%-v/v.  Kata Kunci : Minyak kelapa, Umur simpan, Bilangan Asam, Bilangan Peroksida, Antioksidan Alami, Artificial Neural Network.   DETERMINATION OF COCONUT OIL STORAGE TIME: The Influence of Natural Extract to the Oxidation Rate. Indonesia's coconut plantation is the largest in the world, with a share of 31.2% of the total coconut plantation area in the world. One of the products from coconut is coconut oil. However, coconut oil has a short storage time. Therefore, this experiment aims to estimate and optimize the storage time of coconut oil. The coconut oil used as the experimental sample was an oil made by traditional method. The coconut oils tested in this experiment included coconut oil, plus carrots, pineapple extracts of 10 and 30% -v/v, 10 and 30% -v/v young papaya, and 10 and 30% -v/v tomatoes. The mixture of coconut oil and carrot pieces was stored in light and dark glass bottles, while the mixture of coconut oil and liquid extract was stored only in dark glass bottles. The estimation method of storage time was based on literature values of acid number and peroxide number approximated by equation regression method and Artificial Neural Network (ANN). The experimental results showed that the storage time of coconut oil was 37-41 days for blank oil (in light and dark glass bottles), 50-51 days for the addition of carrot cuts in bright glass bottles, 56-57 days for the addition of carrot carrot cuts in glass bottles dark, 41-45 days for addition of pineapple liquid extract 10% -v/v, 30-32 days for 30% -v/v, 63-64 days for the addition of young papaya 10% -v/v, 55-62 days for 30% -v/v, 24-27 days for tomato liquid extract 10% -v/v, and 17-21 days for 30% -v/v. Key Words : Coconut oil, Storage time, Acid number, Peroxide number, Natural antioxidan, Artificial Neural Network.
      PubDate: 2017-10-20
      DOI: 10.14710/reaktor.17.3.%p
      Issue No: Vol. 17, No. 3 (2017)
       
  • EXTRACTION OF FREE FATTY ACID FROM RICE BRAN OIL USING ETHANOL-WATER IN A
           STIRRED TANK

    • Authors: I Dewa Gede Arsa Putrawan, Rizkyanto Nugroho, Reza Anggara
      First page: 166
      Abstract: This research was aimed to study the extraction of free fatty acid (FFA) from rice bran oil (RBO) in a stirred tank. Fatty acid mixtures derived from RBO were used as FFAs and aqueous ethanol as solvent. First, the distribution coefficients of FFAs were measured through equilibrium experiments. The experiments were carried at 25°C with ethanol concentration in the solvent and FFA concentration in RBO in the ranges of 85-95%-w and 10-30%-w, respectively. In general, the distribution coefficient of FFA was linearly dependent on ethanol concentration. A constant distribution coefficient of 0.9 for FFA RBO, however, is a fairly acceptable assumption with a deviation range of 20-30%. Inaddition, FFA mixtures in RBO could be represented by a pseudo-component. Extraction experiments were proposed to measure the mass transfer coefficient of FFA, with experimental variations including solvent to feed ratio, ethanol concentration in the solvent, stirring rate, and FFA concentration in RBO. The mass transfer coefficient was in the range of (0.5-1.9)10-3 kg·m-2·s-1. Increasing solvent to feed ratio, ethanol concentration in the solvent, stirring rate, or FFA concentration in RBO increased mass transfer coefficient. The mass transfer coefficient data could be correlated well using the dimensionless equation of Skelland-Xien.
      PubDate: 2017-10-03
      DOI: 10.14710/reaktor.17.3.%p
      Issue No: Vol. 17, No. 3 (2017)
       
 
 
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