Method for oxidising h2s to sulphur

Details Method for oxidising h2s to sulphur Method for oxidising h2s to sulphur

C - Chemistry, Metallurgy

01

B

C01B 17/04 (2006.01) B01D 53/86 (2006.01)

Patent

CA 2209331

An oxidation unit (2a) is used which comprises, in series, three catalytic stages (3a, 4a, 5a) each containing a catalyst for promoting the selective oxidation of H¿2?S to sulphur up to a temperature .theta.s ? 150 ·C. The gas to be processed (16) is fed through each of said stages and air (50, 53a, 55a) is injected into each stage. An H¿2?S fraction of said gas is adiabatically oxidised to sulphur in each of the first two stages (3a, 4a) with an amount of air such that a temperature no higher than .theta.s is achieved at the outlet of said stages. All the H¿2?S in the gas fed into the final stage (5a) is oxidised in a controlled excess of air at temperatures no higher than .theta.s. The method is useful for processing H¿2?S-containing gases produced by the hydrogenation/hydrolysis of sulphur plant waste gases.

On opère dans une unité d'oxydation (2a) comportant, en série, trois étages catalytiques (3a, 4a, 5a), renfermant chacun un catalyseur promoteur de l'oxydation sélective de 1'H2S en soufre jusq'à une température .theta.s 150 ~C. On fait passer le gaz à traiter (16) successivement dans chacun desdits étages et injecte de l'air (50, 53a, 55a) dans chaque étage. On oxyde en soufre, de manière adiabatique, une fraction de l'H2S dudit gaz dans chacun des deux premiers étages (3a, 4a) avec une quantité d'air assurant en sortie de ces étages une température d'au plus .theta.s. On oxyde la totalité de l'H2S du gaz passant dans l'étage final (5a) en excès contrôlé d'air et à des températures d'au plus .theta.s. Application au traitement de gaz renfermant H2S obtenus par hydrogénation/hydrolyse de gaz résiduaires d'usines à soufre.

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