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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.
Later the spent caustic solution is injected to the crude feed for the corrosion control in the. overhead system. Experts from refinery think that injection of the spent caustic solution. creates problems in controlling the sodium content in one of the products.