Semi-empirical model for limestone dissolution in adipic acid for wet flue gas desulfurization

Abstract

Wet flue gas desulfurization systems are commonly applied to remove sulfur dioxide by contacting it with limestone in an aqueous phase. The effects of pH, stirring speed, solid-to-liquid ratio, acid concentration, and temperature on the dissolution rate of limestone in adipic acid were investigated. The reaction dissolution kinetics was determined by fitting the experimental data into the shrinking core model. The sorbent was characterized at different dissolution periods. An increase in the specific surface area of the sorbent was attributed to formation of portlandite. The experimental data were found to fit the shrinking core model with chemical reaction control. A semi-empirical model was developed from the experimental data to describe the dissolution kinetics