Catalytic CO<sub>2</sub>-MEA absorptions with the aid of CaCO<sub>3</sub>, MgCO<sub>3</sub>, and BaCO<sub>3</sub> in the batch and semi-batch processes Huancong Shi Min Huang Yuandong Huang Mingqi Cui Raphael Idem 10.6084/m9.figshare.8040161.v1 https://tandf.figshare.com/articles/journal_contribution/Catalytic_CO_sub_2_sub_-MEA_absorptions_with_the_aid_of_CaCO_sub_3_sub_MgCO_sub_3_sub_and_BaCO_sub_3_sub_in_the_batch_and_semi-batch_processes/8040161 <p>Three solid chemicals, CaCO<sub>3</sub>, MgCO<sub>3</sub>, and BaCO<sub>3</sub>, were tested to accelerate the CO<sub>2</sub> absorption with monoethanolamine (MEA) solvents to verify the effect of heterogeneous catalysis. The experiments were conducted in a batch process at 20 ± 0.2 °C and a semi-batch process under room temperature. For the batch process tests, CaCO<sub>3</sub>, MgCO<sub>3</sub>, and BaCO<sub>3</sub>, accelerated the CO<sub>2</sub> absorption with MEA solutions at 1, 3, and 5 mol/L, respectively. The overall absorption periods were reduced by around 39.5%, 36.8%, and 36.8% in 3 M solution; and 31.9%, 19.1%, and 26.6% in 5 M solution. For the semi-batch process tests, CaCO<sub>3</sub> and MgCO<sub>3</sub> accelerated the CO<sub>2</sub> absorption with 5 M MEA solutions by 20% and 20%, from 57 s to 45 s to reach equilibrium at loading of 0.0 mol/mol, and 16% and 12% from 75 s to 63–66 s to reach equilibrium at loading of 0.20 mol/mol. These solid chemicals were good candidates of heterogeneous catalysts of CO<sub>2</sub>–MEA absorption in an amine scrubbing process.</p> 2019-04-25 09:05:10 Carbamate formation CO2 absorption heterogeneous catalysis solid alkaline catalysts Zwitterion mechanism