The CO2 desorption analysis of tri-solvent MEA+BEA+DEEA with several commercial solid acid catalysts

Abstract

The CO2 desorption experiments were conducted with tri-solvents MEA+BEA (Butylethanol amine) +DEEA (N, N-diethylethanolamine) at 0.1∼0.5+2+2 mol/L, combining with 5 commercial catalysts: blended γ-Al2O3/H-ZSM-5, H-beta, H-mordenite, HND-8, and HND-580, to evaluate heat duty. The experiments were conducted in a recirculation process with direct heating at 90 °C or temperature programmed range of 35∼85 °C. The results developed two energy efficient tri-solvent of 0.3+2+2 and 0.5+2+2 with various catalysts, which can proceed CO2 desorption as low as 75–85 °C. After comparison, the 0.3+2+2 and 0.5+2+2 with HND-8 possessed the superior CO2 desorption performance at very low operation temperatures with low Heat Duty (H) and large Desorption Factor (DF). These results provide a highly energy efficient combination of “tri-solvent + catalysts” as a potential candidate for industrial CO2 capture pilot plants.