Abstract: The rate coefficients of pure CO_2 absorption into hot potash solution and DETA (diethylenetriamine) catalyzed hot potash solution have been determined in a modified form of wetted-wall column under automosphere pressure and at high temperature. The concentration of potassium carbonate solution adopted is the same as in industrial practice. The influence of reaction temperature, degree of conversion of conbonate and spray den- sity of the liquid on absorption rate has been discussed and the mathematical correlation equation established. The absorption rate coefficients in a modified form of wetted-wall column and in a stirred cell have been compared under same operation conditions. It was shown that if the absorption follows the pseudo-first order and fast reaction, the result obtained in both absorbers will be identical.