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Membrane and Additional Adsorption Processes for Quality Improvement of Used Frying Oils

Atsushi, Miyagi and Subramanian, R. and Mitsutoshi, Nakajima (2003) Membrane and Additional Adsorption Processes for Quality Improvement of Used Frying Oils. Journal of the American Oil Chemists Society, 80 (9). pp. 927-932.

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The main focus of our study was to improve the quality of used frying oils for recycling as edible oils. Experiments were conducted with hexane-diluted, used frying oils in a batch membrane cell using a nonporous polymeric composite membrane for improving permeate (oil) flux. The oil flux increased by 9- to 14-fold as compared to the permeate flux obtained with undiluted oil. Furthermore, the quality of processed oils was comparable with membrane-processed, undiluted oil. The maximal oil flux was obtained when the weight ratio of oil to oil-hexane retentate (feed) was 0.47 in the process stream. Examination of successive fractions of permeate revealed that membrane performance was not affected by variation in the feed quality. Although the membrane process improved the overall quality of used frying oil, it was not effective in reducing FFA and oxidation products. By combining membrane and adsorption processes, the quality of the used frying oil could be improved to the level of fresh frying oil. Silica gel along with a small amount of magnesium oxide gave the best results in the adsorption process. Combined membrane and adsorption processes seem to be the appropriate approach for the complete regeneration of used frying oils.

Item Type: Article
Uncontrolled Keywords: Adsorption processing, free fatty acids, hexane, magnesium oxide, membrane processing, nonporous polymeric composite membrane, permeate flux improvement, polar compounds, silica gel, used frying oil.
Subjects: 600 Technology > 08 Food technology > 05 Processing and Engineering
600 Technology > 08 Food technology > 19 Lipids-oils/fats
Divisions: Food Engineering
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 26 Jun 2009 05:10
Last Modified: 09 May 2012 07:08
URI: http://ir.cftri.res.in/id/eprint/9119

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