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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.
Shell said an inspection found a leak that developed was due to caustic cracking in stainless steel piping. Higher levels of caustic soda than expected were discovered in the heat-integrated crude unit feed system. As the unit approached normal operating temperatures during start up, caustic cracking occurred. âThe source of the excess caustic relates to the first unit shutdown in early June 2012.