Fremgangsmåte for avsvovling av en gassblanding inneholdende H2S og SO2 med gjennvinning av disse forbindelsene i form av svovel

摘要

A method for desulphurising a gaseous mixture which contains a low overall concentration of H2?S and SO2? in a mol ratio of H2?S:SO2? of about 2:1, and recovering said compounds in the form of sulphur, wherein said gaseous mixture is contracted with a catalyst which is a promoter of the sulphur-forming CLAUS reaction between H2?S and SO2? and comprises at least one end portion consisting of a composite catalytic mass obtained by combining alumina with at least one compound of a metal selected from titanium, yttrium, lanthanum and rare earth metals having an atomic number between 58 and 71. The gaseous mixture to be desulphurised is brought into contact with the catalyst at a temperature which is lower than the dew point of the sulphur thereby produced, preferably at between 120 C and 170 C, so that the sulphur is deposited on the catalyst.