Analysis of CO2 solubility and absorption heat into aqueous 1-Diethylamino-2- propanol

摘要

In this work, the CO2 equilibrium solubility in 2M l-diethylamino-2-propanol (1DEA2P) solution were determined as function of temperature (in the range of 298-333K), and CO2 partial pressure (in the range of 8-101kPa). The modified Li-shen K2 correlation model was also developed and used to predicate the CO2 equilibrium solubility in 1DEA2P solution, with an excellent ADD of 3.4%. The heat of CO2 absorption in 1DEA2P solution estimated using Gibbs-Helmholtz equation was found to be-45.7 kJ/mol. In addition, the ion (1DEA2P, 1DEA2PH~+, HCO3~-, CO3~(2-)) speciation plots of the 1DEA2P-CO2-H2O system were developed in order to further understand the reaction process of 1DEA2P with CO2.