モノエタノールアミン水溶液のCO2ガスの吸収および放散に関する研究

In this paper the absorption rate and the desorption rate of CO2 gas by simultaneous measurement of pH and CO2 concentration in HCl and monoethanolamine(MEA) aqueous solution were studied by blowing CO2 gas and N2 gas through an upward vertical glass nozzle.\ud The results are smmarized as follows.\ud (1) In the case of CO2 gas absorption into MEA aqueous solution, the reaction of CO2 and MEA was considered as\ud pseudo first erder irreversible reaction while CO2 concentration was maintained at zero. The values of activation energies of the apparent absorption rate, (S/V)kL*, in MEA aqueous solution and (S/V)kL in HCl aqueous solution were found to be 20.7kJ/mol and similar 12.3kJ/mol, respectively. A linear relationship was found between (S/V)kL*, which was 3.2 times as much as (S/V)kL, and CO2 gas flow. It seems that the process of mass transfer in liquid film was the rate determining step in this reaction.\ud (2) In the case of desorption from MEA aqueous solution, the apparent desorption rate, (S/V)kL', was equal to that from HCl solution. The value of activation energy of(S/V)kL' in MEA aqueous solution was 17.2kJ/mol and as much as 13.8kJ/mol in HCl aqueous solution. A linear relationship between (S/V)kL' and N2 gas flow were found. It seems that the process of mass transfer in liquid film was the rate determining step in this reaction