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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.
caustic. adj. 1. (Chemistry) capable of burning or corroding by chemical action: caustic soda. 2. sarcastic; cutting: a caustic reply. 3. (General Physics) of, relating to, or denoting light that is reflected or refracted by a curved surface. n. 4. (General Physics) Also called: caustic surface a surface that envelops the light rays reflected or refracted by a curved surface. 5.