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Reduce salt corrosion rates with stronger base amines

09.01.2013  |  Lack, J.,  Baker Hughes, Sugar Land, TexasHarrell, B.,  Baker Hughes, Sugar Land, Texas

When processing discounted crude oils, one of the primary challenges refiners face is under-salt corrosion in crude unit distillation overhead systems.

Keywords: [salt] [corrosion] [crude unit distillation] [base amines] [monoethanolamine] [ammonia]

When processing discounted crude oils, one of the primary challenges refiners face is under-salt corrosion in crude unit distillation overhead systems. The combination of higher overhead chloride levels and the presence of amine contaminants in discounted crudes can greatly increase the risk of salt formation. For those overhead systems where amine salt corrosion cannot be mitigated by conventional methods, the application of nontraditional neutralizing amines can be beneficial. In particular, under-salt corrosion rates produced by stronger base amines are significantly less than those of weaker bases found as contaminants, such as ammonia or monoethanolamine. Corrosion rates can also be reduced when the weaker base contaminant salts are mixed with stronger base amine salts. Significant reductions in corrosion rates have been confirmed in both laboratory and field operating environments.

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