Separation of oil constituents in organic solvents using polymeric membranes.

Koike, S. and Subramanian, R. and Nabetani, H. and Nakajima, M. (2002) Separation of oil constituents in organic solvents using polymeric membranes. Journal of the American Oil Chemists' Society, 79 (9). pp. 937-942.

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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) (NTR-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.

Item Type:	Article
Uncontrolled Keywords:	Diafiltration, ethanol, free fatty acids (FFA), glycerides, hexane, nonporous polymeric membranes, oil constituents, permeate flux, rejection, selectivity.
Subjects:	500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 17 Fatty Acid Chemistry 600 Technology > 08 Food technology > 05 Processing and Engineering
Divisions:	Food Engineering
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	01 Jul 2009 07:30
Last Modified:	28 Dec 2011 09:50
URI:	http://ir.cftri.res.in/id/eprint/5336

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