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Continuous Bleaching Section
Basic process of refining is same in both batch & continuous refinery. Only difference is instead of a measured batch, crude oil is processed continuously with constant stream of flow. Inbetween required utilities & chemicals are added continuously in measured quantity.
Basic stages of the process are as below
Nutralizing , Bleaching, Dewaxing & Deodorizing.
Crude oil from obtained from expellers, solvent extraction plant contains foreign impurities such as mucilage, gums and unfiltered proteinous matter from the seed. It also contains gums which making it unfit for edible purpose.
Batch refining consists of following sections.
1) Nutralizing
2) Bleaching
3) Dewaxing
4) Deodorizing
therefore the first stage of refining is to separate these gums & foreign impurities with chemicals and hot water treatment called as degumming/Nutralizing process. Thereafter the degummed oil is further processed in bleaching section under vacuum and treated with bleaching earth and carbon for reduction of colour pigments. Next it will be deodorized under high vacuum.
The edible oil obtained from refinery is of good quality meeting all requirements of international standards. 
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