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Chapter 22.4.9 Combined Claus unit and tail gas treatmentDescriptionIn a Claus plant, a part of the H 2 S is burnt to SO 2 which then reacts with the remaining H 2 S on acatalyst to yield elemental sulphur condensed from the gas phase. Claus processes in variousconcepts are state-of-the-art for sulphur recovery from streams containing H 2 S. To furtherrecover sulphur, subsequent tail gas treatment is applied.For more detailed information about Claus units and subsequent tail gas treatment, see [8,European Commission, 2002].Achieved environmental benefits• recovery of sulphur with efficiencies of 98.66 to 99.99 % related to the combination ofClaus unit and tail gas treatment [8, European Commission, 2002].Cross-media effectsSee [8, European Commission, 2002].Operational dataSee [8, European Commission, 2002].ApplicabilityThis technique is applicable to new and existing partial oxidation plants.EconomicsSee [8, European Commission, 2002].Driving force for implementationSee [8, European Commission, 2002].References to literature and example plants[3, European Commission, 1997, 8, European Commission, 2002]72 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers