In-depth study of desorption kinetics in adsorption process

Abstract

In this paper, open-loop desorption experiments were carried out by hot gas sweeping. The effects of different concentrations of methylene chloride and temperatures in the sweeping gas on the desorption process were investigated from three perspectives: average desorption rate (rm V-30$, rm V-9$) instantaneous desorption rate (Vmax) and desorption kinetics. It was concluded that the maximum instantaneous desorption rate could better represent the desorption rate required by the experiment at different sweeping concentrations and temperatures. The maximum instantaneous desorption rate Vmax increased with the rising temperature and decreased with the increasing concentration of inlet methylene chloride. The concluded law was the same as the average desorption rate (rmV30$) of 30 min. Thereinto, the temperature had a significant influence on Vmax. As the temperature increased, the concentration of inlet methylene chloride also inhibited the maximum instantaneous desorption rate Vmax more obviously. This provided important reference data for the optimization design of desorption equipment in the activated carbon adsorption process.