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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.
Concentrated caustic soda is. circulated with a certain pressure. by a circulating pump. Dosing of lye and diluting water is. done with a magnetic flowmeters. and a pneumatic dosing valves. The lye flow is controlled by the. PLC in relation to the oil flow and. the FFA content. The diluting water flow is. controlled in relation to the lye.