An insight on reaction kinetics of amino-acid-functionalized ionic liquid monoethanolamine glycinate for CO2 capture

Abstract

ABSTRACT Recently, the application of functionalized ionic liquids in carbon dioxide (CO2) capture has received significant attention. In this research, the absorption kinetics of CO2 into the aqueous amino-acid-functionalized monoethanolamine glycinate ionic liquid in a stirred cell reactor was investigated. Amino acids are less volatile and have good resistance against oxidative degradation. Experiments were accomplished over a temperature range of 298–308 K and solution concentrations ranging from 0.5 to 2.5 M in the pseudo-first-order regime. The dimensionless Hatta number and infinite enhancement factor were calculated to check the fast pseudo-first-order reaction assumption. The reaction rate constant has been evaluated by recording the system pressure reduction rate over time. Increasing the IL concentration and temperature results in a significant increase in the reaction rate. The obtained kinetic constants have the same order of magnitude as those existing for primary amines.