The absorption Of SO2 into limestone slurry containing suspended reactive particles was performed in a bubble reactor with continuous feeding of both gas and liquid phases at a constant pH and high temperature (50 degrees C). An absorption model with a reaction plane based on the film model was developed. The effect of limestone particle size, concentration, acetic acid additives, and inlet SO2 concentration on the concentration distribution of chemical species in the liquid film and SO2 absorption rate were simulated. Increasing the concentration of limestone slurry, adding acetic acid additives into the system or decreasing the limestone particle size or inlet SO2 concentration caused the reaction plane in the liquid film to shift towards the gas-liquid interface. Model and experimental results were compared, and it was shown that the model fits the experimental data well.