Patent ID: 7695701
Filing Date: 2010-04-13
Classification: B01D,C01B,F23C,F23G,F23L,Y02P

Abstract:
1. A process for treating an acid gas comprising hydrogen sulfide which comprises: (a) introducing a first acid gas, which comprises hydrogen sulfide and a first oxygen-containing gas into a reducing furnace producing a first oxidized gas stream, wherein the temperature of the reducing furnace is in the range of 1100° C. to 1350° C., and wherein the amount of oxygen-containing gas in the reducing furnace is about 30-50% of the stoichiometric amount for oxidation of all of the sulfur-containing compounds to SO (b) introducing the first oxidized gas stream into a first heat recovery system wherein the stream is cooled and heat is recovered therefrom; (c) introducing the cooled first oxidized gas stream and a second oxygen-containing gas, into an oxidizing furnace, which comprises a burner and a chamber, producing a second oxidized gas stream, wherein the temperature of the oxidizing furnace is in the range of 950° C. to 1100° C. and wherein the amount of oxygen in the second oxygen-containing gas is greater than the stoichiometric amount required for complete combustion; and (d) introducing the second oxidized gas stream into a second heat recovery system; wherein the second oxidized gas stream is cooled and heat is recovered therefrom.