LAUSR

Abstract 21 pairs of physical-chemical biphasic solvents were screened out using a fast screening facility and the distribution of components was detected both in upper and lower phases after absorption. The physical solvents and amines were enriched in opposite phases due to the limited solubility of absorption products in the physical solvents, and the enrichment of components gets higher as the loading time goes by. Comparisons of the cyclic capacity showed that MEA and DETA were much better main solvents than BDA in biphasic solvents, and 2.5 DETA-4 sulfolane has the highest CO2 cyclic capacity of 4.486 mol  L −1, which was much higher than that of 30 wt% MEA. The concentrations of physical solvents influence the cyclic capacity a lot rather than the types of physical solvents. Then the phase separation character and absorption performance were analyzed for solutions in different amine to physical solvent concentration ratios, and the results showed that increasing the concentration of the physical solvent within certain range benefits to raising cyclic absorption capacity and reducing the energy penalty. At last, the sensible heat and vaporization heat of two biphasic solvents were estimated with a flash module of Aspen Plus, which showed less energy penalty than that of 30 wt% MEA.