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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.
Refinery Caustic Injection Systems: Design, Operation, And Case Studies. ABSTRACT. Caustic injection is used to reduce refinery crude-column-overhead hydrochloric acid corrosion. Such injection systems are considered to be critical equipment because failures can potentially have catastrophic results. Accordingly, it is necessary to rigorously design caustic injection systems to assure correctness and reliable performance.