Kinetics study of CO2 absorption in AMP and Piperazine solutions
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Kinetics of CO2 in AMP (2-amino 2-methyl 1-propanol) with concentration of 0.1/0.5/1.0/2.0/3.0/4.0 M, 3M AMP with CO2 loadings of 0.15/0.22/0.29 and 0.1/0.5/1.0/1.5M piperazine solutions were measured at a temperature range of 25-70oC. The AMP system was measured at 1KPa pressure of CO2 while CO2- loaded AMP and piperazine were measured at different partial pressures that range from 1-9KPa. The experiments for AMP system were performed in string of disc contactor while PZ system was measured in wetted wall column. The results for rate constants were interpreted in terms of termolecular mechanism for the reaction of CO2 with amine.The physiochemical properties like density, solubility and viscosity of AMP, CO2-loaded 3M AMP and PZ solutions were also measured to study the kinetics of CO2 in AMP and PZ solutions. Density was measured in Anton Paar DMA 4500M density meter at all above mentioned concentrations and within a temperature range of 20-80oC. Viscosity was measured in Physica MCR 100 rheometer at a temperature range of 20-80oC while solubility was calculated from the experiments in stirred jacketed glass vessel for CO2-loaded AMP and PZ (0.5 and 1.5M). Different nitrogen flow rates, gas circulation rates and liquid flow rates were also measured in string of discs contactor to determine the exact value of these to be used for the whole experiments. Simple models based on temperature and concentration was applied on Excel sheet in order to calculate the density, solubility and viscosity. Soft model was applied to calculate the back pressure of CO2 in the 3M AMP loaded systems. The absorption flux of CO2 in AMP (unloaded and CO2-loaded) and PZ solutions, Henry?s constants, mass transfer coefficients and second order rate constants were determined for each case and compared these with the reported data for AMP and PZ.