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Soapstock is the main co-product in the refining industry of vegetable oils and animal fats. It has a high content of saponified fatty acids and is formed during the neutralization step of the chemical refining of the fatty material. The Soapstock is an alkaline oily emulsion consisting of water, saponified fatty acids, triglycerides, phosphatides and other compounds in smaller amounts. It is used for various purposes, such as in the soap industry and for the production of a concentrate of free fatty acids.