PROCESS FOR IMPROVING THE SULFUR YIELD OF A SULFUR PRODUCTION KIT FROM AN H2S-CONTAINING ACIDIC GAS, SAID ASSEMBLY COMPRISING A SULFUR FACTORY FOLLOWED BY A PURIFICATION UNIT

摘要

P The sulfur plant 1, into which the acid gas 8 and a gas containing free oxygen 9 is introduced, produces sulfur by gentle oxidation of the H2 S of the acid gas and further provides a waste gas. 17b containing H2 O, H2 S, SO2 and at least one of COS and CS2 derivatives. This waste gas is brought into contact with a hydrolysis catalyst 2 of the COS and CS2 derivatives at H2 S operating between 180 degree (s) C and 400 degree (s) C to produce a hydrolysed waste gas containing H2 S and SO2 and substantially free of COS and CS2. The hydrolysed waste gas 38 is introduced into a purification unit 3, into which H2 S and SO2 are reacted to form sulfur, operating at a temperature below the dew point of the sulfur formed, and to obtain, moreover, as output 29 of said unit a purified waste gas, which is then incinerated 4. / P P The H2 S resulting from the hydrolysis of COS and CS2 is recovered almost completely in the form of sulfur in the unit d purification, which improves the sulfur yield of the whole. / P