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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.
Sodium hydroxide. Sodium hydroxide or caustic soda has the chemical formula of NaOH. Na is the symbol for sodium after its Latin name 'natrium'. OH is the symbol for hydroxide. The word caustic means 'burns'. Sodium hydroxide is a white solid and is available in pellet of powder forms.