Study of Catalytic CO2 Absorption and Desorption with Tertiary Amine DEEA and 1DMA-2P with the Aid of Solid Acid and Solid Alkaline Chemicals

• Main Authors: Huancong Shi, Min Huang, Qiming Wu, Linna Zheng, Lifeng Cui, Shuping Zhang, Paitoon Tontiwachwuthikul
• Format: Article
• Language: English
• Published: MDPI AG 2019-03-01
• Series: Molecules
• Subjects: CO2 absorption; tertiary amines; CO2 desorption; energy cost; equilibrium; solubility
• Online Access: http://www.mdpi.com/1420-3049/24/6/1009
• ISSN: 1420-3049

Studies of catalytic CO2 absorption and desorption were completed in two well-performed tertiary amines: diethylmonoethanolamine (DEEA) and 1-dimethylamino-2-propanol (1DMA-2P), with the aid of CaCO3 and MgCO3 in the absorption process, and with the aid of γ-Al2O3 and H-ZSM-5 in the desorption process. The batch process was used for CO2 absorption with solid alkalis, and the recirculation process was used for CO2 desorption with solid acid catalysts. The CO2 equilibrium solubility and pKa were also measured at 293 K with results comparable to the literature. The catalytic tests discovered that the heterogeneous catalysis of tertiary amines on both absorption and desorption sides were quite different from monoethanolamine (MEA) and diethanolamine (DEA). These results were illustrative as a start-up to further study of the kinetics of heterogeneous catalysis of CO2 to tertiary amines based on their special reaction schemes and base-catalyzed hydration mechanism.