Apparatus for treating a gas containing hydrogen sulphide and sulphur dioxide, comprising a step for depleting the recycled solvent in sulphur

An apparatus for treating a gas containing hydrogen sulphide and sulphur dioxide comprising a first gas-liquid reactor-contactor (2), means (3) for supplying a gas to be treated into the first reactor-contactor and means (5) for supplying an organic solvent into the first reactor-contactor, means (25) for recovering sulphur from the first reactor-contactor and means (20) for extracting a gaseous effluent containing sulphur in vapour form from the first reactor-contactor, a second reactor-contactor (102) connected to the means (20) for extracting the gaseous effluent, means (105) for supplying an organic solvent which is depleted in sulphur connected to the second reactor-contactor, means (120) for recovering a gaseous effluent which has been cleaned of sulphur connected to the second reactor-contactor, means (104) for extracting a liquid phase containing the organic solvent and sulphur connected to the second reactor-contactor, at least one means for depleting at least a portion of the liquid phase in sulphur connected to the means (104) for extracting the liquid phase, said means for depleting comprising at least one means (190) for cooling said liquid phase connected to a means (118) for separating solid sulphur which delivers a solid phase (125) of sulphur at a first end and a liquid phase (121) which is depleted in sulphur at a second end, the second end being connected to means (105) for supplying solvent depleted in sulphur, wherein at least one of the reactor-contactors contains a catalyst.