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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.
In Chemistry Bases (whether strong or weak) are described as Caustic. So depending on the concentration would be greater than pH 7. When the word Caustic used, it is usually a â¦ ssociated with a very high pH typically 12- 14.