ABSORPTION RATES OF CO_2 INTO AQUEOUS MIXTURES OF MDEA (METHYLDIETHANOLAMINE) AND HMDA (HEXAMETHYLENEDIAMINE)

摘要

Absorption rates of CO_2 by aqueous mixtures of MDEA(20.5 wt%) and HMDA(0.7, 3.5, 7.0 and 14.4 wt%) were measured by the apparatus for gas absorption equilibrium. The experimental results showed that the absorption kinetics of CO_2 into the aqueous mixtures of MDEA and HMDA regarded as a pseudo-first order reversible reaction. As the concentration of mixed HMDA increased, the apparent absorption rate constants were increased from 25 %(0.7 wt% HMDA) to 292 %(14.4 wt% HMDA) comparing with 20.5 wt% MDEA.