In the thermal stage of the Claus process, the partial combustion of hydrogen sulphide (H2S) with atmospheric oxygen in a Claus furnace produces a certain amount of sulphur dioxide (SO2) at 950 - 1,400 °C. The resulting SO2 which has already partially reacted in the Claus furnace with the existing H2S to elemental sulphur, initially accumulates as S2 because of the high temperatures. The further stages for the production of elemental sulphur take place behind the Claus furnace.
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