PROCESS FOR RECOVERING SULPHUR FROM A H 2?S-CONTAINING GAS STREAM UNDER HIGH PRESSURE

摘要

A process allows high pressure desulfurization of gas streams with relatively small equipment but with a high recovery rate. In at least one reactor, the H2S is directly oxidized by catalysis to give sulfur. Two reactors are used with advantage, the first of which, in the direction of flow, is preferably a reactor operated adiabatically without internal cooling, crossed from bottom to top by the gas stream, while the second reactor, in the direction of The flow is a reactor cooled with advantage to a temperature below the condensation point of sulfur, preferably crossed from top to bottom by the gas stream. As a rule, different catalysts are introduced into the two reactors, although the two catalysts consist mainly of TiO2 and directly and selectively oxidize H2S, but not H2 and CO. In the first reactor without internal cooling, the H2S is directly and selectively oxidized under high pressure by the catalyst. In the second reactor, internally cooled, the reaction continues, while the sulfur already condensed, under the prevailing high pressure conditions, itself has a catalytic effect, which makes regeneration of this liquid sulfur reactor superfluous. The sulfur produced is condensed and separated from the high pressure gas stream. The entire desulfurization process can be further improved by reducing sulfur compounds and / or sulfur vapors, until H2S is obtained and / or by adsorption, chemisorption or washing with NaOH of H2S, residual sulfur compounds and / or sulfur vapors.