Abstract:The absorption and desorption process of CO2 in different organic amine aqueous solution (MEA, DEA, MDEA, TETA, DETA) were compared and analysed in a stirred reactor under normal pressure. The effect of reaction temperature and amine concentration on the absorption and the desorption process in each amine solution was studied. At the same time, the absorption and desorption of CO2 in mixed organic amine is also investigated by orthogonal experiment and an optimized program is obtained. It was found that the comprehensive performance of absorption and desorption of mixed organic amine with molar ratio of TETA and DEA as 5:1 is better under the conditions of an absorbing temperature at 318K and a desorbing temperature at 388K respectively.