Many types of demulsifier, according to the classification of surfactants can be divided into: cationic, anionic, nonionic, two types of ionic demulsifier. Anionic salts of carboxylic acids demulsifier, sulfonate and polyoxyethylene fatty acid ester salt, etc., with the amount of large, poor, vulnerable and less effective electrolyte affect other shortcomings; cationic demulsifier mainly quaternary class, which has a significant effect on the thin oil, but not for heavy oil and aging oil; non-ionic mainly to the amine as the initiator of polyether block to block polyether alcohols as initiator, block polyether alkyl phenolic resin, phenol formaldehyde resin block polyether amines, silicon demulsifiers, ultrahigh molecular weight demulsifiers, polyphosphate, block polyether modified products and to imidazoline demulsifier represented by two types of ionic demulsifier.
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