The objective of this research was to study both experimentally and theoretically the absorption of carbon dioxide into aqueous blends of 2-Amino-2-methyl-1-propanol (AMP) and piperazine (PZ). The PZ with concentrations of 0.1, 0.2, 0.3, and 0.4 kmol m-3 were blended into 2.0 and 3.0 kmol m-3 aqueous AMP solutions. The temperature ranges from 30 to 40 oC. The experimental reaction kinetics data were represented by a pseudo-first order reaction mechanism incorporated with the zwitterion mechanism for CO2-AMP reaction mechanism to obtain the reaction rate constants of carbon dioxide with AMP and PZ. The experimental measurements were: density, viscosity of PZ/H2O and PZ/AMP/H2O and Henry's constant and diffusivity of N2O in PZ/H2O and PZ/AMP/H2O, also the reaction kinetic data of CO2 reaction with PZ/H2O and PZ/AMP/H2O. The experimental measurements have been completed as planned. Also for the ionic liquids, physical properties such as density and viscosity of ionic liquids have been measured. The equilibrium solubility of CO2 in ionic liquids was measured using the microbalance. Due to the completion of the expansion construction of the membrane technology center in Chung Yuan Christian University, the microbalance has been setup and test run in the beginning of December (12/2006), the preliminary results of the measurement were presented in this report. The specific CO2 absorption rate will be measured using a wetted-wall column apparatus. The physicochemical properties such as density, viscosity, Henry's law constant and diffusivity of nitrous oxide in amines were also measured. The N2O analogy was used to estimate the Henry's law constant and diffusivity of CO2 in amines solutions. The kinetics data of CO2/ AMP/PZ/H2O were used to determine the reaction rate constants for CO2/AMP, CO2/PZ. The determined reaction rate constants were consistent for single amines and blend amine systems. The results of this study can provide the fundamental kinetics data for the process design for the CO2 absorption using aqueous PZ/AMP solutions as absorbents.
