Method for recovering elemental sulfur from coal-gas

Details Method for recovering elemental sulfur from coal-gas Method for recovering elemental sulfur from coal-gas

C - Chemistry, Metallurgy

01

B

23/334

C01B 17/04 (2006.01) B01D 53/34 (2006.01) C01B 17/027 (2006.01)

Patent

CA 1263517

Abstract of the Disclosure An improved method for the recovery of elemental sulfur(S) from a coal- gas containing hydrogen sulfide (H2S) wherein hot lime (CaO) is used and then regenerated according to the following chemistry: CaO + H2S = CaS + H2O CaS + O2 = CaO + SO2 SO2 + C = S + CO2 These chemical reactions are conducted in-situ while the supply of carbon (C) for the formation of the elemental sulfur(S) is derived from a component of the coal-gas itself to increase the overall efficiency of desulfurization, in- crease the uniformity of the carbon deposit into the hot lime (CaO), and elimi- nate the extra and cumbersome steps of physically moving the spent lime (CaO) for regeneration and returning it after regeneration, and the step of adding coal to react with the sulfur dioxide (SO2) formed as an off-gas during regeneration.

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