Using Supercritical Fluid Extraction Device to Recycle PEG-400 as Solvent for Preparation of Conjugated Linoleic Acid

Abstract

Abstract: A supercritical fluid extraction device was used to recycle the solvent polyethylene glycol (PEG) 400 left over after the preparation of conjugated linoleic acid (CLA) by alkali isomerization in this study. The effects of various extraction conditions on the separation of PEG-400 were investigated. The optimal extraction conditions were determined as extraction pressure of 10 MPa, four-step extraction temperatures of 25-35-45-55 ℃ and extraction time of 3 h. Under these conditions, the recycling rate of PEG-400 was up to 70.06%, and the purity of PEG-400 was 97%. The results of one-way ANOVA showed that extraction pressure, temperature and extraction time had a marked effect on the recycling of PEG 400.

Key words: supercritical fluid, extraction, PEG-400, recycling rate

CLC Number:

TS224.4

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Using Supercritical Fluid Extraction Device to Recycle PEG-400 as Solvent for Preparation of Conjugated Linoleic Acid

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