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1. (WO1998032819) PURIFYING POLYUNSATURATED FATTY ACID GLYCERIDES

Pub. No.:    WO/1998/032819    International Application No.:    PCT/NO1998/000025
Publication Date: Fri Jul 31 01:59:59 CEST 1998 International Filing Date: Tue Jan 27 00:59:59 CET 1998
IPC: C07C 67/58
C11B 3/00
C11B 3/16
C11B 7/00
Applicants: NORSK HYDRO ASA
PERRUT, Michel
BREIVIK, Harald
MAJEWSKI, Wieslaw
Inventors: PERRUT, Michel
BREIVIK, Harald
MAJEWSKI, Wieslaw
Title: PURIFYING POLYUNSATURATED FATTY ACID GLYCERIDES
Abstract:
A composition containing polyunsaturated fatty acid glycerides is purified by means of supercritical fluid fractionation in one or more countercurrent columns operated either with internal reflux achieved by a temperature gradient along the column or with an external reflux achieved through external regulation of the pressure, and using as the solvent a mixture of supercritical CO2 and a polar co-solvent. Oligomeric and malodorous impurities in particular can be successfully removed by this process, which also can, if desired, be followed, or preceded, by another supercritical fluid fractionation with supercritical CO2 under conditions adjusted so as to favour fractionation of the glyceride components.