Modeling the rate of corrosion of carbon steel using activated diethanolamine solutions for CO2 absorption

doi:10.1016/j.cjche.2020.03.006

Abstract

Abstract: A mechanistic model is developed to investigate the influence of an activator on the corrosion rate of carbon steel in the absorption processes of carbon dioxide (CO₂). Piperazine (PZ) is used as the activator in diethanolamine (DEA) aqueous solutions. The developed model for corrosion takes into consideration the effect of fluid flow, transfer of charge and diffusion of oxidizing agents and operating parameters like temperature, activator concentration, CO₂ loading and pH. The study consists of two major models: Vapor-liquid Equilibrium (VLE) model and electrochemical corrosion model. The electrolyte-NRTL equilibrium model was used for determination of concentration of chemical species in the bulk solution. The results of speciation were subsequently used for producing polarization curves and predicting the rate of corrosion occurring at the surface of metal. An increase in concentration of activator, increases the rate of corrosion of carbon steel in mixtures of activated DEA.

Key words: CO₂ capture, CO₂ corrosion, Carbon steel, Diethanolamine, Piperazine, Electrochemical model

摘要： A mechanistic model is developed to investigate the influence of an activator on the corrosion rate of carbon steel in the absorption processes of carbon dioxide (CO₂). Piperazine (PZ) is used as the activator in diethanolamine (DEA) aqueous solutions. The developed model for corrosion takes into consideration the effect of fluid flow, transfer of charge and diffusion of oxidizing agents and operating parameters like temperature, activator concentration, CO₂ loading and pH. The study consists of two major models: Vapor-liquid Equilibrium (VLE) model and electrochemical corrosion model. The electrolyte-NRTL equilibrium model was used for determination of concentration of chemical species in the bulk solution. The results of speciation were subsequently used for producing polarization curves and predicting the rate of corrosion occurring at the surface of metal. An increase in concentration of activator, increases the rate of corrosion of carbon steel in mixtures of activated DEA.

关键词: CO₂ capture, CO₂ corrosion, Carbon steel, Diethanolamine, Piperazine, Electrochemical model

Lubna Ghalib, Ahmed Abdulkareem, Brahim Si Ali, Shaukat Ali Mazari. Modeling the rate of corrosion of carbon steel using activated diethanolamine solutions for CO₂ absorption[J]. Chinese Journal of Chemical Engineering, 2020, 28(8): 2099-2110.

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Modeling the rate of corrosion of carbon steel using activated diethanolamine solutions for CO₂ absorption

Modeling the rate of corrosion of carbon steel using activated diethanolamine solutions for CO₂ absorption

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