With the catalytic induction of EG, anhydrous DMEA shows CO2 absorption performance via chemical binding and physical storage under normal pressure. Among the absorbents, pure DMEA can hardly absorb CO2 directly but when the zwitterionic alkylcarbonates are formed between CO2 and DMEA-EG which can be characterized by 13C NMR and FTIR, the absorption rate of CO2 will be improved at this time. An increasing the CO2 loading as the mass fraction of EG in DMEA-EG, 90wt.% EG captures up to 0.72 mol/mol. The amount of chemically bound and physically stored is directly dependent on temperature, within the range of 293 to 323K, an absorption-regeneration cycle can be formed in a closed vessel because of the zwitterion DMEA-EG-CO2 is unstable at the higher temperature. In other words, DMEA-EG-CO2 can be easily regenerated upon appropriate depressurization or heating, corresponding thermodynamic calculations prove that the regenerative energy of DMEA-EG-CO2 is 25.49kJ/mol.

For the carbon dioxide desorption in anaerobic fermentation process, a mathematical model for the micro-interface mass transfer of a multi-component single bubble was established. Based on the theory of gas generation, the relationships between bubble shape, mass transfer and energy consumption required for bubble generation were discussed. Design indicator such as effective mass transfer height and effective stay time of the bubbles have been established to guide the optical selection of initial bubble size and liquid level height (reactor height). On this basis, calculation of multi-bubble system was further performed to evaluate the influence of bubble size on the gas holdup, and energy consumption. It was found that the performance evaluation based on gas flux was obtained, and the influence of bubble radius on gas mass transfer rate and gas holdup under a certain flux was investigated

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