Reaction of hydrogen sulfide with limestone particles

Abstract

Publisher Summary Hydrogen sulfide (H 2 S) removal from a coal gasifier by limestone injection seems economical because of its technical simplicity and high efficiency. Depending on whether the carbon dioxide (CO 2 ) partial pressure is lower or higher than its equilibrium value, H 2 S can be captured by either calcined limestone or limestone. This chapter interprets the superior H 2 Sreactivity and the final capacity of calcined limestone over those of limestone that are ascribed to its higher porosity and larger specific surface area. The low reactivity of limestone can be significantly enhanced by a simple repeated calcination/carbonation treatment during sulfidation under conditions of high partial pressures of CO 2 . The sulfidation product is identified through X-ray powder diffractometer. A scanning electron microscopy (SEM) is also utilized for examining the calcium sulphide (CaS) surface morphology.