Kinetic study of electrodialysis of acetic acid and phosphate in fermentation broth |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran;2. Department of Chemical Engineering, University of Guilan, Rasht, Iran;1. Department of Food Science and Technology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria;2. Department of Agro-Industry, Faculty of Agriculture, Natural Resources and Environment, Naresuan University, Phitsanulok, Thailand;3. Department of Biotechnology, Faculty of Engineering and Industrial Technology, Silpakorn University, Muang, Nakhon Pathom 73000, Thailand;1. Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, India;2. Department of Biotechnology, Dr. Ambedkar Institute of Technology for Handicapped, Kanpur, India;3. Department of Chemical Engineering, Indian Institute of Technology Bombay, Mumbai, India;4. Division of Germplasm Conservation, National Bureau of Plant Genetic Resources, Indian Council of Agricultural Research, Ministry of Agriculture (Govt. of India), Pusa Campus, New Delhi, India;5. Department of Science, Upper Primary School, Mundera, Unnao, India;6. Faculty of Environment, University of Waterloo, Waterloo, ON, Canada;7. Department of Biochemical Engineering, School of Chemical Technology, Harcourt Butler Technical University, Kanpur, India;8. Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, India;9. Center for the Environment, Indian Institute of Technology Guwahati, Guwahati, India;1. Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, No. 1799 Jimei Road, Xiamen City, Fujian, 361021, China;2. Cluster for Bio-engineering, Department of Microbial and Molecular Systems, Faculty of Engineering Technology, KU Leuven Campus Bruges, Spoorwegstraat 12, 8200, Brugge, Belgium;3. Cluster for Sustainable Chemical Process Technology, Department of Chemical Engineering, KU Leuven, Technology Campus Ghent, Gebroeders De Smetstraat 1, B-9000, Gent, Belgium;1. Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Key Laboratory of Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China |
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| Abstract: | Ion fluxes of acetic acid and phosphate in the electrodialysis of a model fermentation broth were examined using a solution of acetic acid and potassium dihydrogenphosphate. As the molar fraction of the phosphate was increased the ion flux of the acetic acid decreased, which was as predicted theoretically. As the influent pH was increased the flux also increased notably, reached a maximum, and then decreased slightly. The maximum flux was obtained in a pH range from 5.2 (near pKa) to 6.6. The pH at the exit of the electrodialyzer became markedly alkaline when the influent pH was in the range of 6 to 7 in the absence of the phosphate. The pH range shifted to the alkaline side and the degree of alkalinity reduced as the molar fraction of phosphate increased. This may be ascribed to the buffering effect of the phosphate. It is concluded that the optimum pH for the electrodialysis of an organic acid fermentation broth is around (pKa + 1), where a relatively high ion flux with high current efficiency and a small pH increase at the exit of the electrodialyzer are established. |
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