Vegetable oils alcohol refining process

High aliphatic alcohols and wax esters in which aliphatic alcohols or sterols are esterified to fatty or phenolic acids are also present in cmde vegetable oils at low levels and are partially removed in the winterization process during oil refining. Waxes, mainly esters of long-chain saturated fatty acids and a monounsaturated alcohol, especially eicosenoic alcohol, are found in crude vegetable oils such as olive, sunflower, soybean or peanut but are absent from com or rice bran oils... 

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