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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.
Caustic soda is a vital element in various industrial applications. In terms of household applications, it is a key ingredient in drain and oven cleaners. This chemical is highly reactive and corrosive. It can cause irritation to the eyes, skin and gastrointestinal tract. A large dose of caustic soda in an aquatic system can alter its pH and cause toxic reactions to aquatic elements. In metals, caustic solutions usually lead to corrosion.