Special pre-treatment steps which are essentially a combination of de-gumming and blending under special operating conditions, eliminate all impurities and render oil fit to be processed at elevated temperature under vacuum. Various steps involved in refining are
(1) Super cleaning
(2) Contobleaching and
(3) De-acidification.
All these processes are very well standardized and practiced in the country since long. The average recovery is 90%.
