What is meant by refined oil?

Refined oil means that crude vegetable oil is refined through special process to remove harmful impurities which is not good for human being and storage, the final oil is refined oil. Some vegetable oil is not edible only after refined such as rice bran oil ,cottonseed oil, sunflower oil ,palm oil etc. Olive oil, sesame oil, coconut oil,groundnut oil can be just cold filtered without refining. 

Vegetable oil refining process has four basic steps: degumming ,deacidification, decoloration and deodorization. Main purpose is to remove phophatide,colorant,free fatty acid etc to make sure that refined oil meets national oil standard.

Depending on different technology to remove free fatty acid, vegetable oil refining is divided into chemical refining and physical refining. Chemical refining is adding alkali to neutralize free fatty acid . Physical refining is using high temperature vacuum steam to evaporate free fatty acid. For high acid value crude oil, such as rice bran oil is better use physical refining to reduce oil loss.

Depending on different capacity and automation, vegetable oil refining is divided into batch refining,semi continuous refining and continuous refining. Batch refining normally is used for small scale oil refining less than 15 tons per day. Capacity for more than 50 tons per day must adopt continuous refining. From 30-50 tons per day, you can choose semi continous or continuous refining.

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