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.