SULPHUR PRODUCTION METHOD Russian patent published in 2023 - IPC C01B17/04 B01D53/50 B01D53/86 

FIELD: sulphur production.

SUBSTANCE: invention is related to a process for converting H₂S to elemental sulphur in a Claus process unit. Feedstock containing feed gas with 30-100 vol.% of H₂S, sulfuric acid, sub-stoichiometric molecular oxygen and, if necessary, fuel is sent to the Claus reaction furnace to produce Claus reaction furnace off-gas. The exhaust gas is cooled and, if necessary, elemental sulphur is removed from the gas. The resulting off-gas is directed to contact with an SO₃ barrier material that absorbs and/or converts SO₃. The resulting SO₃ free gas is sent to contact with a material catalytically active in the Claus reaction. Elemental sulphur is isolated, if necessary, by cooling the effluent from the material catalytically active in the Claus reaction. Moreover, the specified material protecting from SO₃ differs from the specified material, which is catalytically active in the Claus reaction.

EFFECT: ensures safe and long-term operation of the installation for the Claus process.

13 cl, 3 dwg, 2 tbl, 9 ex