Corrosion reduction with amine scavengers

Details Corrosion reduction with amine scavengers Corrosion reduction with amine scavengers

C - Chemistry, Metallurgy

10

G

C10G 75/02 (2006.01) C10G 9/16 (2006.01)

Patent

CA 2524668

Corrosive amine salts in hydrocarbon streams such as desalted crude oil streams can be prevented or avoided by adding certain amine scavenging chemicals to the streams. Suitable amine scavengers include, but are not necessarily limited to, carboxylic anhydrides and copolymers of carboxylic anhydrides, aromatic anhydrides, isocyanates, polyisocyanates, and epoxides. The non-corrosive reaction products of the amines and/or ammonia with these scavengers are preferably oil-soluble, non-basic and thermally stable. The amine scavengers bind up and react with the amines and/or ammonia to keep them from reacting with materials such as acids (e.g. HCI) to form corrosive amine salts.

L'invention permet de supprimer ou d'éliminer des sels d'amines corrosifs dans des flux d'hydrocarbure déssalé, notamment des flux de pétrole brut dessalé, par l'ajout de substances chimiques captant certaines amines, à ces flux. Des capteurs d'amines appropriés comprennent, de manière non exhaustive, des anhydrides carboxyliques et des copolymères d'anhydrides carboxyliques, des anhydrides aromatiques, des isocyanates, des polyisocyanates, et des époxydes. Les produits réactionnels non corrosifs de ces amines et/ou de l'ammoniac avec ces capteurs sont de préférence solubles dans l'huile, non basiques et thermiquement stables. Les capteurs d'amines se lient et réagissent avec les amines et/ou avec de l'ammoniac pour les empêcher de réagir avec des matières telles que des acides (par exemple HCl) pour former des sels d'amines corrosifs.

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