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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.
This has to be concentrated to 50% and the salt has to be removed. An evaporative process is used where there are three tonnes of steam per tonne of caustic soda. This salt is separated from the caustic brine and is used to saturate dilute brine. The chlorine is purified by liquefaction and evaporation.