Patent ID: 7780942

Claim:
A catalytic process carried out in at least three catalytic reactors connected in a sequence for treating a mixture of H 2 S and of SO 2 issued from a first combustion stage of a Claus process in order to produce liquid sulfur, said process comprising the following steps: a) at least one step of heating the mixture comprising the SO 2 and the H 2 S to a temperature Ts, b) at least one step of catalytically reacting the heated mixture obtained in a) in the presence of at least one catalyst and at least one stage of recovering the outlet mixture comprising gaseous sulfur, c) at least one step of converting the gaseous sulfur present in the outlet mixture obtained in stage b) to liquid sulfur, wherein between step b) and step c) for at least one of the last two catalytic reactors, measuring the temperature To of said outlet mixture and the dew point temperature Td of the gaseous sulfur present in said outlet mixture, and adjusting the heating temperature Ts of step a) so that the temperature To is greater than the dew point temperature Td by 5° C. to 30° C.