Development of Chemical CO2 Solvent For High Pressure CO2 Capture (2): Addition Effects of Non-aqueous Media on Amine Solutions

Abstract

To develop high performance chemical CO 2 solvents for high-pressure CO 2 capture, a part of water contained in amine aqueous solution has been substituted with some kinds of organic media. We have found that several kinds of organic media with certain functional group make amine aqueous solutions have high performances for CO 2 capture under high pressure conditions. The RH-3 series solvents improved on RH-2b by addition of the organic media show higher CO 2 absorption rates, higher CO 2 desorption rates, higher CO 2 loading-differences lower CO 2 absorption heats, and/or lower solution specific heat than that without the organic media. An application of the pressurized desorption process to 4.0 MPa-CO 2 is estimated to reduce the total energy for CO 2 capture process including compression process with RH-3e to less than 1.1 GJ/t-CO 2 .