Kinetics of sulfur dioxide adsorption on modified activated coal produced from peach shells

Abstract

The kinetics of sulfur dioxide adsorption on modified coal produced from the peach shell was investigated. It was determined the optimal conditions to produce modified activated coals for the processes of effective purification of gases from sulfur dioxide, confirmed by industrial tests. The most rapid adsorption of sulfur dioxide occurs on the shell treated by ZnCl2 (impregnation coefficient 0.4), followed by activation in the CO2 stream at a temperature of 773 K, the pore size of which is easily accessible to sulfur dioxide molecules regardless of their molecular weight and structure. The values of the dynamic characteristics show that with the increase of particle size, the «value of the dead layer» – disabled – increases, therefore, with the increase of particle size, the dynamic activity of the adsorbent decreases. With the increase of the gas flow speed, the time of the protective action is significantly reduced, the process proceeds intensively.