Catalytic CO<sub>2</sub> Capture Performance of a\nMEA-EAE-DEEA Trisolvent in a Hot Silicon Oil-Based Pilot Plant

To\nimplement an energy-efficient combination of CO<sub>2</sub> capture\ntechnology, the pilot plant studies were conducted in preparation\nof commercialization of CCUS demonstration plants, during which a\nset of specific amine blends with various catalytic packing was employed.\nTo achieve the best performance in a novel hot silicon oil-based lab-scale\nCO<sub>2</sub> absorption–desorption pilot facility, this study\nfocused on the steady-state CO<sub>2</sub> absorption–desorption\nperformance of the trisolvent MEA (monoethanol amine)-EAE (2-(ethylamino)ethanol)-DEEA\n(<i>N</i>,<i>N</i>-diethylethanolamine) at a specific\nconcentration of 4.5 mol/L, with the combination of two types of solid\nbase catalysts (CaCO<sub>3</sub> and CaMg(CO<sub>3</sub>)<sub>2</sub>) and solid acid catalysts (HND-580 and HND-8) under specific operation\nconditions. Evaluation of the steady-state analysis was based on three\nkey parameters: absorption efficiency (AE), cyclic capacity (CC),\nand heat duty (HD). Results indicated cyclic capacity enhancement\nand significant heat duty reduction with solid acid–base catalysts\ncompared to noncatalytic benchmarks. The optimal concentration ratio\nwas 0.5 + 2 + 2 mol/L MEA-EAE-DEEA, with the addition of 150 g of\nHND-8 + 40 g of CaMg (CO<sub>3</sub>)<sub>2</sub>, an F<sub>G</sub> of 8 L/min, and an F<sub>L</sub> of 60 mL/min. Under the optimized\nconditions, the heat duty was decreased from 3.0 to 2.46 GJ/t CO<sub>2</sub> over the noncatalytic benchmark.