Experimental Study of Regeneration Performance of Aqueous N,N-Diethylethanolamine Solution in a Column Packed with Dixon Ring Random Packing

Carbon dioxide (CO 2 ) stripping from CO 2 -loaded aqueous N, N -diethylethanolamine solution (DEEA) was comprehensively investigated in a laboratory scale regeneration column packed with Dixon ring random packing. The regeneration heat duty ( Q reb ) of DEEA was evaluated as a function of various operating parameters, including rich CO 2 loading, lean CO 2 loading, solution flow rate, feed temperature, and DEEA concentration, as well as synergistic parameters (e.g., Δα × L and C × L ). The experimental results showed that the Q reb was sensitive to these operating parameters. For example, the Q reb decreased significantly as the lean CO 2 loading, rich CO 2 loading, and DEEA concentration increased, indicating that the Q reb can be reduced by adjusting these operating parameters. In addition, CO 2 -loaded aqueous DEEA solution was observed to have a lower Q reb (of 2.17 GJ/t CO 2 ) as compared to those of aqueous MEA and DETA solutions. Based on heat duty alone, DEEA can be considered to be an attractive solvent for amine-based postcombustion CO 2 capture.