Abstract
Carbon dioxide (CO2) stripping from CO2-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 (Qreb) of DEEA was evaluated as a function of various operating parameters, including rich CO2 loading, lean CO2 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 Qreb was sensitive to these operating parameters. For example, the Qreb decreased significantly as the lean CO2 loading, rich CO2 loading, and DEEA concentration increased, indicating that the Qreb can be reduced by adjusting these operating parameters. In addition, CO2-loaded aqueous DEEA solution was observed to have a lower Qreb (of 2.17 GJ/t CO2) 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 CO2 capture.
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