Purification of crude glyceride oil compositions.

摘要

A process for purifying crude glyceride oil compositions comprises diluting crude glyceride oil containing gum material and wax as main impurities with an organic solvent, bringing the diluted crude glyceride oil composition into contact under pressure with a semi-permeable membrane composed of polyimide having a repeating unit of the general formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="16" wi="64" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein R<Sup>1</Sup> represents a divalent organic group. A semi-permeable membrane permeable liquid in which the gum material content in the glyceride oil after removal of said organic solvent is 100 ppm or less is thus obtained. The glyceride oil obtained from said semi-permeable membrane permeable liquid is then bleached with at least one adsorbent selected from clay, activated clay, activated carbon and bone black, and bleached oil deodorized to obtain a purified glyceride oil.