A comprehensive study was conducted to evaluate the contributions of sulfur dioxide (SO 2 ) and oxygen (O 2 ) to the degradation of monoethanolamine (MEA) during CO 2 capture from power-plant flue gas streams. The study was performed in a 600-mL semibatch autoclave reactor, using aqueous MEA concentrations in the range of 3−7 mol/L at temperatures in the range of 328−413 K and a constant gas pressure of 250 kPa. The aqueous MEA was contacted with SO 2 /O 2 /N 2 gas mixtures that had SO 2 concentrations in the range of 6−196 ppm and O 2 concentrations in the range of 6−100 mol %. The effects of CO 2 and a corrosion inhibitor (NaVO 3 ) were also evaluated. The results showed that both SO 2 and O 2 were detrimental, because they accelerated the rate of MEA degradation. NaVO 3 also accelerated the MEA degradation rate, whereas CO 2 had the opposite effect. A new kinetic model was formulated to account for the presence of O 2 and the option of the presence or absence of SO 2 in the flue gas stream. This was of the form:
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Uyanga et al. (2007) studied this question.
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