Reaction Kinetics of Carbon Dioxide with Diethanolamine in Polar Organic Solvents

Abstract

Abstract The chemical absorption rate of carbon dioxide with diethanoamine was measured in such nonaqueous solvents as methanol, ethanol, n‐propanol, n‐butanol, ethylene glycol, propylene glycol, and propylene carbonate, and in water at 298 K and 101.3 kPa using a semibatch stirred tank with a plane gas‐liquid interface. The overall reaction rate constant obtained under the condition of fast reaction regime from the measured rate of absorption was used to get the elementary reaction rate constants in complicated reactions represented by reaction mechanism of carbamate formation and the order of overall reaction of CO2 with amine. Correlation between the elementary reaction rate constant and the solubility parameter of the solvent was presented. Keywords: Absorptioncarbon dioxidediethanolamineorganic solvent Acknowledgments This work was supported from the Basic Research Program of the Korea Science and Engineering Foundation (KOSEF) through the Applied Rheology Center (ARC), Brain Korea 21 Project in 2004, and Brain Busan 21 Program.