Abstract
CO 2 has been absorbed in a stirred vessel into aqueous solutions of MEA and DEA containing K 2CO 3, K 2SO 4 and Na 2SO 4 at 25° and 11°C. While electrolytes in general appear to increase the rate of reaction between CO 2 and both MEA and DEA, K 2CO 3 increases the rate of reaction of DEA much more than that of MEA. The addition of K 2CO 3 to solutions of DEA increases the absorption rate, in spite of the decrease in the solubility and diffusivity of CO 2. The observations help to explain why DEA is an effective promoter for the absorption and desorption of CO 2 by hot, concentrated potash solutions.
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