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 treating a gas containing hydrogen sulphide and sulfur dioxide in which at least one gas-liquid contactor reactor (2) is brought into contact with the gas at a suitable temperature is described. with an organic solvent (1) containing a catalyst and recovering a gas (20) containing substantially no more hydrogen sulfide and sulfur dioxide. More particularly, a solvent-sulfur solution (4) of solvent and sulfur is withdrawn from the contactor-reactor, a portion thereof is cooled in at least one cooling zone (8) so as to obtain a suspension of sulfur crystals in the solvent. separates the crystalline sulfur from the solvent in a separation zone (10) and, on the one hand, recovering sulfur-containing solvent (14, 15) which is recycled (1) at least partly into the reactor-contactor (2), and on the other hand sulfur (13). Application to the purification of effluents from Claus units.