Effect of zinc oxide nanoparticles on rate of carbon dioxide solubility in aqueous n-methyldiethanolamine solution
Volume Title: 1
1Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran
2Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
The most common method to remove sour gas from natural gas is used chemical solvents such as N-methyldiethanolamine. The rate of CO2 solubility in this chemical solvent is lower than other alkanolamines like DEA and MEA. Therefore, many studies have been developed in order to increase the solubility of carbon dioxide in aqueous N-methyldiethanolamine. In this study, the rate of CO2 solubility in aqueous N-methyldiethanolamine solution was investigated in the presence of zinc oxide nanoparticles with different composition at 40oC by using the liquid-gas equilibrium setup. "Rate of pressure decreasing" and "apparent absorption rate" were measured for CO2 in the water-alkanolamine-nanoparticle system with compositions of (20 wt.%, 1500 ppm), (40 wt.%, 500 ppm) and (40 wt.%, 1500 ppm) for N-methyldiethanolamine and zinc oxide nanoparticles, respectively. The study of pressure rate and apparent absorption rate showed that by loading zinc oxide nanoparticles to aqueous alkanolamine solutions the rate of CO2 solubility increased in aqueous N-methyldiethanolamine.