Effect of Corrosion Inhibitors on Oxidative Degradation of MEA in Carbon Dioxide Capture Distillation

概要

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The effect of corrosion inhibitors such as CuCO3, CuSO4, and Na2SO3 on the oxidation of MEA was investigated. The products of oxidative degradation of MEA were analyzed with or without the corrosion inhibitors. The corrosion inhibitor effected on the oxidative degradation of MEA and the extent of oxidative degradation is in the order CuCO3 > CuSO4 > MEA without inhibitors > Na2SO3. There was no difference of absorption/desorption rates among MEA solutions with and without the corrosion inhibitors. Among the products of the oxidative degradation of MEA, formate and acetate were dominant degradation products and nitrites and nitrates were also present in large amounts. The corrosion inhibitor CuCO3 and CuSO4 acted as catalysts for oxidative degradation of MEA. CuCO3 and CuSO4 influenced the formation of carboxylic acids (formate, acetate, and oxalate) but did not influence the formation of nitrogen products (nitrites and nitrates). Na2SO3 slightly inhibited the oxidative degradation of MEA and did not make more oxidation products than CuCO3 and CuSO4.