Редколлегия Физикохимия Поверхности и Защита Материалов - Corrosion of Structure Materials and Their Weld Joints in the Environments of Monoethanolamine Gas C

Corrosion of Structure Materials and Their Weld Joints in the Environments of Monoethanolamine Gas Cleaning in Ammonia Production

V. A. Kachanov, Yu. B. Danilov, T. E. Shepil’, E. K. Gvozdikova, A. I. Kabashnyi, V. Yu. Kozin, and S. M. Ivanuna

Ukrainian Research Institute for Chemical Machine Building, ul. Marshala Koneva 21, Kharkiv, 61001 Ukraine

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Abstract — It is shown that the main cause of increased corrosion damage in equipment in units of monoethanolamine that remove CO₂ from converter gas exceed the regulation levels of formic acid, as chloride ions are acquired in the equipment during the neutralization of formic acid with caustic containing chlorides, as are distorting hydrodynamic flows in columns due to the corrosion of inner items, which results in the working environment effecting the structural elements. In order to lower the corrosivity of the working environment, it is recommended to control the content of formic acid by keeping it below 0.1 g/l, to neutralize it with caustic containing no chloride ions, and to eliminate the distortion of hydrodynamic flows in the apparatus, thus preventing the impact effects of the environment.