Deacidification and solvent recovery of soybean oil by nanofiltration membranes

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• 作者：Leticia R. Firman^a ; ^{lfirman@ing.unrc.edu.ar} ; Nelio A. Ochoa^b ; ^{aochoa@unsl.edu.ar} ; José ; Marchese^b ; ^{marchese@unsl.edu.ar} ; Cecilia L. Pagliero^a ; ^{cpagliero@ing.unrc.edu.ar}
• 关键词：Nanofiltration ; Polymeric membrane ; Soybean oil ; Solvent recovery ; Deacidification
• 刊名：Journal of Membrane Science
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：431
• 期：Complete
• 页码：187-196
• 全文大小：1034 K

文摘

Four tailor-made flat composite membranes of poly(vinylideneflouride) (PVDF) as a support and polydimethylsiloxane (PDMS) or cellulose acetate (CA) as coating layer, and a commercially available composite membrane (Solsep 030306) were used to remove hexane and free fatty acid (FFA) from crude soybean oil-hexane mixture. The effects of transmembrane pressure (¦¤p=10-20 bar), temperature (T=30-50 ¡ãC) and feed oil concentration (C_f=10-35 w/w % ) on membrane selectivity and permeation flux were determined. The PVDF-12 % siloxane composite nanofiltration membrane achieved the best results, being stable in commercial hexane and having promising permselectivity properties to separate soybean oil/hexane miscella. Improved separation performance was obtained at C_f=25 % , ¦¤p=20 bar, and T=30 ¡ãC, achieving a permeate flux of 20.3 Lm^?2 h^?1, 80 % oil retention, 58 % FFA removal.