Abstract
The MEA-DEA blended amine solvents have been a hot research topic recently. This study focused on the absorption efficiency tests of 5 mol/L MEA-DEA blended solvents in a batch and semi-batch process, with the aid of solid chemicals CaCO3 and MgCO3. 5.0 mol/L MEA solvent was used as benchmark. The absorption profiles and initial absorption rates were plotted to select the optimized mix ratio. The results indicated that 2+3M MEA-DEA had good performance in absorption with the aid of CaCO3. After comprehensive consideration, the 2+3M MEA-DEA with solid alkaline chemical (CaCO3) in the absorber and blended catalysts (γ-Al2O3/H-ZSM-5 = 2:1) in the desorber was selected as the energy efficient solution (among 1+4, 2+3, 3+2, and 4+1M MEA-DEA) for the pilot plant. It contained 72–75% of the absorption efficiency but only 46.5–50% of the heat duty compared with 5M non-catalytic MEA.
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