Evaluation CO₂ solubility in biphasic solvent with AMP/Ether/Water for CO₂ capture

Abstract

We suggest new CO₂ absorption processes with biphasic phase separation type for reducing consumption energy. the CO₂-rich solution liquid was separated hydrophilic liquid and hydrophobic liquid. In this work, we studied some kind of amine and ether mixture solvents, and observed phase separation phenomena. From the results of phase separation characteristics, we selected with 2-Amino-2-methyl-1-prophanol (AMP), diethylene diethyl ether (DEGDEE) and water pair. We measured the CO₂ solubility at different temperature and CO₂ patricidal pressure conditions, and evaluated the effect of component concentration in the solvents on CO₂ absorption characteristics and phase separation phenomena. We adjusted the biphasic solvents. AMP, DEGDEE and H₂O of biphasic solvent weight-composition ratio are 30, 20 and 50 wt% respectively. The CO₂ solubility of absorption at 40℃, 0.1atm was obtained 0.647 mol-CO₂/mol-AMINE. The CO₂ solubility of desorption at 90℃, 1.0 atm was obtained 0.177 mol-CO₂/mol-AMINE. The difference of CO₂ loading of this solvent was high performance of CO₂ capture compared with that of other solvents. These result is attributed to the additive phase assisting in the regeneration of CO₂ by extracting the regenerated amine. The results of the present study show reduction of desorption temperature and high CO₂ absorption performance.