Kinetics of the Absorption of Carbon Dioxide into Mixed Aqueoussolutions of Piperazine and 2-amino-2-methyl-1-propanol

• Main Authors: Chun-Ting Lin, 林俊廷
• Other Authors: Meng-Hui Li
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/04967869294268436959

碩士 === 中原大學 === 化學工程研究所 === 95 === The objective of this research was to study both experimentally and theoretically the absorption of carbon dioxide into aqueous blends of piperazine (PZ) and 2-amino-2-methyl-1-propanol (AMP). 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 experiment can estimate the effect of absorption rate of carbon dioxide for increasing PZ into AMP aqueous solution. The specific CO2 absorption rate was 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 experimental reaction kinetics data were represented by two models：(1) Pseudo-first order reaction mechanism incorporated with the zwitterion mechanism for CO2-AMP reaction mechanism. (2) Simplified combined mass transfer reaction kinetics equilibrium. Both of these two methods can obtain the reaction rate constants of carbon dioxide with PZ and AMP. The kinetics data of CO2/PZ/AMP/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 result shows that increasing PZ in AMP aqueous solution can raising the absorption rate of carbon dioxide of blended amine solution.