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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 main objective of this research is. to find a suitable method to get rid of spent caustic (NaOH solution) that is produced in the. LPG plant at Preem AB GÃ¶teborg. The company is using 10% caustic soda to wash hydrogen. sulphide from propane and butane product streams. Currently, the spent caustic is used for. crude overhead corrosion control after propane and butane washing. The injection of spent. caustic is causing problems of improper corrosion control in the crude overhead system and. higher amount of sodium in the residue.