METHOD AND DEVICE FOR PROCESSING A HYDROGEN SULPHIDE-CONTAINING GAS, COMPRISING A COOLING STEP FOR CRYSTALLISED SULPHUR REMOVAL.

摘要

A method and a device for processing a gas containing hydrogen sulphide and sulphur dioxide, wherein the gas is contacted with an organic solvent (1) containing a catalyst in at least one gas/liquid reactor/contactor (2) at a suitable temperature, and the gas (20) substantially free of hydrogen sulphide and sulphur dioxide is recovered. Specifically, a single-phase solvent and sulphur solution (4) is drawn off from the reactor/contactor, a portion thereof is cooled in at least one cooling area (8) to form a suspension of sulphur crystals in the solvent, the crystallised sulphur is separated from the solvent in a separation area (10), and both a sulphur-depleted solvent (14, 15) that is at least partially recycled (1) in the reactor/contactor (2), and sulphur (13), are recovered. The method and device are useful for purifying effluents from Claus units.