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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 is a corrosive chemical sometimes known as lye or caustic soda. It's chemical formula is NaOH. It is an ionic compound, because it is made of a metal ion, sodium (Na+), that is attracted to a nonmental ion, hydroxide (OH-). When it is a solid it is white and it has a high melting point of 604.4F.