Collect. Czech. Chem. Commun. 1999, 64, 157-167

Effect of Water Vapour on the Equilibrium Between CaO and COS in Coal Gas

Miloslav Hartman*, Karel Svoboda and Otakar Trnka

Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, Rozvojová 135, 165 02 Prague 6, Czech Republic


The effectiveness of calcium oxide in the removal of carbonyl sulfide from coal gas is estimated by thermochemical computations. It is assumed that the gas phase composition is determined by the equilibria of the reactions of water vapour with calcium sulfide and carbonyl sulfide and by the water-gas-shift reaction. The proposed relationships can be employed in engineering considerations and calculations.

Keywords: Coal gas desulfurization; Calcium oxide; Carbonyl sulfide; Equilibrium concentrations; Environmental chemistry; Waste gases treatment.