Absorption of co2 into aqueous tertiary amine/mea solutions

Absorption rates for CO/sub 2/ into aqueous solutions of TEA, MDEA and blends of MEA with MDEA and TEA were measured in a stirred cell by a method similar to that used. Second-order rate constants for CO/sub 2/- TEA and CO/sub 2/-MDEA were obtained for temperatures in the range 25-60{sup 0}C. A model based on the film theory is used to predict the rate of absorption of CO/sub 2/ into mixed amine solutions. This model accounts for the variation of amine concentration in the film. Bulk liquid concentrations of the various species present are obtained from a simplified thermodynamic model. Predicted rates are in reasonable agreement with measurements.