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Flux behavior in a hydrophobic dense membrane with undiluted and hexane-diluted vegetable oils

Manjula, S. and Nabetani, H. and Subramanian, R. (2011) Flux behavior in a hydrophobic dense membrane with undiluted and hexane-diluted vegetable oils. Journal of Membrane Science, 366 . pp. 43-47.

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Abstract

The flux behavior of a hydrophobic dense membrane (NTGS-2200) with polydimethylsiloxane as active layer and polyimide as support layer was studied with various vegetable oils under undiluted and hexanediluted conditions. Hexane dilution improved the permeate oil flux in all the vegetable oils by at least one order of magnitude and applied pressure increased the total flux as well as oil flux. The dense membrane did not reject triglycerides (TG) over a wide range of hexane dilution (5–80% oil concentration) and operating pressure (0.5–4 MPa) due to a positive flow coupling with hexane. All the oils exhibited an inverse relationship between viscosity and total flux under undiluted and various levels of hexane-diluted conditions. The results revealed that the oil flux followed an inverse relationship with average molecular weights of TG despite their narrow range (670–961 Da) of existence in various vegetable oils, interestingly even under hexane-diluted conditions. Although both viscosity and TG molecular weight showed good correlation with permeate flux, the latter displayed a much better correlation hitherto unexplored and unexploited. This remarkable observation could be supportive in characterizing hydrophobic dense membranes specifically for nonaqueous applications.

Item Type: Article
Uncontrolled Keywords: Hexane dilution Hydrophobic dense membrane Permeate oil flux Triglyceride molecular weight Viscosity
Subjects: 600 Technology > 08 Food technology > 19 Lipids-oils/fats
Divisions: Food Engineering
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 23 Feb 2011 11:33
Last Modified: 28 Dec 2011 10:21
URI: http://ir.cftri.com/id/eprint/9923

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