Response surface historical method, simulation of CO2 absorption process by DEA in FFR using COMSOL multiphysics

Abstract

Absorption of carbon dioxide as a greenhouse gas from a mixture of CO2 and N2 in a continuous falling film reactor (FFR) has been designed and developed. The reactor length and inner diameter were 1m and 0.021m, respectively. In this paper, the absorption of CO2 by DEA (Diethanolamine) in FFR is studied by means of COMSOL Multiphysics and Design expert. Design expert is used to developing an empirical equation for CO2 absorption when reacting with DEA. The simulation is performed with COMSOL Multiphysics for a second-order reaction and the velocity profile is considered the effect of shear stress. The result shows that the penetration depth of CO2 in the falling film reactor is 0.006mm and the absorption rate increases with increasing gas flow velocity and inlet CO2 concentration. Also, this study is performed on low Reynolds number (1 ≤ ReG ≤ 6 and 4 ≤ ReL ≤ 40 at 298 K) which has not been considered by other researchers.