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alkali refining. in fat and oil processing: Alkali refining. Many of these can be removed by treating fats at 40Â° to 85Â° C (104Â° to 185Â° F) with an aqueous solution of caustic soda ( sodium hydroxide) or soda ash (sodium carbonate). The refining may be done in a tank (in which case it is called batch or tank refining) or in a continuous system.
Neutralization: Here oil is treated with caustic soda. Caustic soda reacts with fatty acid and soap tock is formed. The oil and soap stock are separated by centrifugal force and centrifugal separators. The refining loss is low due to sharp separation of oil and soap.