초록 ▼

A process and apparatus for removal of volatile divalent sulfur compounds from waste gases. Volatile organic compounds are advantageously removed in the same process. The divalent sulfur compounds are oxidized in a combustion zone, then preferably removed from the combustion gas, as by absorption or

A process and apparatus for removal of volatile divalent sulfur compounds from waste gases. Volatile organic compounds are advantageously removed in the same process. The divalent sulfur compounds are oxidized in a combustion zone, then preferably removed from the combustion gas, as by absorption or adsorption. The divalent sulfur compound and any VOCs are oxidized in either a catalytic or thermal combustion zone, after which the combustion gases are cooled by transfer of heat to the contaminated gases entering the combustion zone. A regenerative heat transfer reaction system is preferably used. Catalyst may comprise a noble metal, or oxides of Cr, Cu and/or Mn. A catalyst degraded by deposition of sulfate or sulfite salts on its surface may be reactivated by in situ decomposition of such salts. Reactivation also removes such salts from the heat transfer storage beds of a regenerative heat transfer reaction system.

대표청구항 ▼

A process for removing a volatile sulfur compound selected from the group consisting of hydrogen sulfide, carbon disulfide, carbonyl sulfide, organic sulfur compounds and mixtures thereof from a contaminated gas stream comprising: reacting in a combustion zone said volatile sulfur compound contained

A process for removing a volatile sulfur compound selected from the group consisting of hydrogen sulfide, carbon disulfide, carbonyl sulfide, organic sulfur compounds and mixtures thereof from a contaminated gas stream comprising: reacting in a combustion zone said volatile sulfur compound contained in a gas stream with oxygen in or upstream of a bed comprising a catalytic material, thereby producing a combustion gas containing sulfur oxide, said sulfur oxide predominantly comprising sulfur dioxide wherein the surfaces of said bed becoming progressively coated with sulfite and/or sulfate salts by deposit thereof from the gas stream, and removing said sulfate and/or sulfite salts from said bed in situ while continuing to introduce said contaminated gas stream into said combustion zone and oxidizing said volatile sulfur compound in said combustion zone to produce said combustion gas, said sulfite and/or sulfate salts being removed from said bed by heating said catalyst bed to a reactivation temperature at which said salts are decomposed to sulfur oxide gases, said sulfur oxide gases being purged from said combustion zone.