Separation of oil constituents in organic solvents using polymeric membranes |
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Authors: | S Koike R Subramanian H Nabetani M Nakajima |
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Affiliation: | (1) Reaction and Separation Engineering Laboratory, National Food Research Institute, 305-8642 Tsukuba, Japan;(2) ASAHI Denka Co. Ltd., 116-8553 Tokyo, Japan;(3) Present address: Department of Food Engineering, Central Food Technological Research Institute, 570013 Mysore, India |
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Abstract: | Different types of commercial nonporous (reverse osmosis and gas separation) polymeric membranes were screened for their abilities
to separate FFA, MG, DG, and TG from a lipase hydrolysate of high-oleic sunflower oil after diluting it with organic solvents
(ethanol and hexane). Cellulose acetate (CA) (NIR-1698) membrane gave the largest difference in rejection between FFA and
glycerides and high flux in oil/ethanol mixtures. In the hexane system, the values of permeate flux and rejection were generally
lower than those in the ethanol system. The silicone-polyimide composite membrane (NTGS-2100) gave the highest flux and rejections
of solutes (70.2% for FFA, 94.4% for TG) in oil/hexane mixtures. In the ethanol system with the CA membrane, TG had the highest
rejection (98%) followed by DG (90%) and MG and FFA (50–70%) when the oil concentration was varied from 6.3 to 45.8%. A discontinuous
diafiltration process (16 batches) using the CA membrane with ethanol changed the composition of the oil from 31∶28∶9∶32 TG/DG/MG/FFA
to 65∶30∶1∶4. The results of this study showed that oil constituents can be separated in suitable solvents using appropriate
nonporous membranes. |
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Keywords: | Diafiltration ethanol free fatty acids (FFA) glycerides hexane nonporous polymeric membranes oil constituents permeate flux rejection selectivity |
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