Novel DETA-Isobutanol biphasic solvent for post-combustion CO2 capture: High cyclic capacity and low energy consumption

Abstract

In recent years, research into biphasic solvents has become an important direction more efficient control of CO2 emissions. However, most biphasic absorbents still face challenges such as low cyclic capacity and high viscosity of the rich phase. To develop a novel solvent with enhanced cyclic capacity and reduced regeneration energy consumption, a biphasic solvent consisting of DETA/Isobutanol/H2O was proposed. The results demonstrate excellent absorption and desorption performance of the DETA/Isobutanol/H2O biphasic solvent, with an absorption capacity ranging from 1.13 to 1.35 mol/mol and a cyclic capacity ranging from 0.61 to 0.84 mol/mol. After conducting 5 times absorption-desorption experiments, the cyclic capacity of DETA/Isobutanol/H2O biphasic solvent remained at 0.8 mol/mol. The estimated energy consumption for regeneration, under lean phase load, was calculated to be 2.42 GJ/t CO2, which was 42.24 % lower than that of 30wt% MEA aqueous solution (4.19 GJ/t CO2). The DETA/Isobutanol/H2O solution exhibits promising potential in terms of absorption-desorption performance and regenerative energy consumption, making it an exceptional CO2 absorbent.