Prediction of uncatalyzed calcium bisulfite oxidation under different operating regimes

et limestone scrubbing is the most common flue gas desulphurization (FGD)process. In this process, oxidation of calcium bisulphite plays a major role bothby determining the dewatering properties of the obtained sludge and the productionof gypsum of high quality. In order to contribute to the simulation of the wet limestone FGDprocess, in the present paper a comprehensive model for isothermal gas–liquid stirred tankreactors has been used. Based on the assumption that the reactions are zeroth order with respectto gaseous reactants, the model requires appropriate physico-chemical parameters which aretaken from the literature. The model was used to quantitatively interpret some literatureexperimental data concerning uncatalysed calcium bisulphite oxidation performed in acontinuous stirred tank reactor. In particular, the model is capable of confidently predictingthe transition from chemically to mass transfer controlled regime occurring when changing theoperating conditions.