The three-zone enhancement model

after investigating the enhancement of gas absorption on solid dissolution

was developed for the absorption systems with complex reactions between absorbed gas and dissolved particles existing in the liquid film zone. Enhancement of absorption rate was measured at different solid hold-up and stirring intensity in a batch stirred vessel for the SO2-Mg(OH)2 system.It was found that particle size

slurry hold-up

‘inert zone’thickness

and partial pressure of transported gas showed major influences on the absorption enhancement.The model results with the consideration of ‘inert zone’ near gas-liquid interface and corrected by apparent viscosity agreed with experimental data well.