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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.
The co-. products formed from the electrolytic production of caustic soda are chlorine and hydrogen. The largest users of caustic soda are the pulp and paper, detergent and chemical industries. Caustic soda. is also used in the alumina, oil and gas and textile industries, mostly for its alkalinity value. OxyChem has played a leading role in providing caustic soda to meet the increasing demands of industry.