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Definition of caustic. 1 : capable of destroying or eating away by chemical action : corrosive The chemical was so caustic that it ate through the pipe. 2 : marked by incisive sarcasm a caustic film review caustic humor.
Caustics are added to desalting water to neutralize acids and reduce corrosion. They are also added to desalted crude in order to reduce the amount of corrosive chlorides in the tower overheads. They are used in some refinery treating processes to remove contaminants from hydrocarbon streams.