Abstract:The potential of 1-butyl-3-methylimidazolium tetrachloroferrate ([bmim] O was reduced to FeCl 2 , at the same time, H 2 S was oxidized to S 8 . In addition, the decrease in acidity caused by increasing the water content increased the weight percent of absorbed H 2 S, and decreased volatile HCl emissions. However, it is difficult to prevent the suspended S 8 generated at vol % (H 2 O) ≥ 80% from the formation of sulfur blockage. Therefore, oxidative absorption of H 2 S by [bmim]Fe(III)Cl 4 -H 2 O mixtures is feasible at vol % (H 2 O) < 80% without sulfur blockage.