APPLICATION OF THE SHRINKING CORE MODEL TO THE KINETICS OF ZINC-OXIDEDESULFURIZATION

The kinetics of H2S removal by zinc oxide desulfurizer was studied thr ough thermogravimetric analysis. The experimental results show that de sulfurization rate was controlled, at high temperature and low convers ion, by the chemical reaction rate, and at low temperature and high co nversion by the grain diffusion rate. The reaction is first order with respect to H2S concentration in the different controlled stages. The kinetic behavior can be modeled through the employment of the shrinkin g core model. The values of the model parameters were determined. The variation tendencies with temperature and concentration of H2S at the controlled stages were discussed.