Gas treating solution corrosion inhibitor

C - Chemistry – Metallurgy – 23 – F

Patent

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C23F 11/06 (2006.01) C10L 3/10 (2006.01) C23F 11/02 (2006.01) C23F 11/10 (2006.01) C23F 11/14 (2006.01)

Patent

CA 2306235

Corrosion in aqueous alkanolamine, physical solvents, or combination of alkanolamine and physical solvent solutions used to remove acid gases from natural gas, synthetic gas, or light hydrocarbon streams can be reduced by addition of mixtures of oxygen scavengers or mixtures of oxygen scavengers and sodium molybdate. The oxygen scavengers must be promoted to reduce metal surfaces in contact with the solutions to a more passive, harder, and insoluble form at the operating temperature of the treating system. The sodium molybdate provides additional passivation especially in the imperfections on the surface of the metal where corrosion accelerates.

On peut diminuer la corrosion dans une alcanolamine aqueuse, des solvants physiques, ou des combinaisons de solutions à base d'alcanolamine et de solvant physique utilisées pour éliminer des gaz acides d'un gaz naturel ou synthétique, ou de flux d'hydrocarbures légers, en ajoutant des mélanges de désoxygénants ou des mélanges de désoxygénants et de molybdate de sodium. Les désoxygénants doivent être utilisés de manière à réduire par passivation les surfaces métalliques en contact avec lesdites solutions et à obtenir une forme insoluble plus solide et plus passive à la température de fonctionnement du système de traitement. Le molybdate de sodium fournit en outre une passivation supplémentaire, notamment pour les imperfections présentes sur la surface du métal, là où la corrosion s'intensifie.

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