C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/331
C01B 17/04 (2006.01)
Patent
CA 1131883
ABSTRACT OF THE DISCLOSURE A process for treating H2S-containing gases which have also a relatively high CO2 content, wherein sulphur-containing compounds of said gases are converted to elemental sulphur in a Calus plant. The process is applied to gases having a calculated H2S/CO2 ratio of less than 1. In a first absorption zone sulphur- containing compounds (H2S, COS, CS2) and CO2 are absorbed in a liquid under non-selective absorption conditions, and after regen- eration of said absorption liquid, partly fed to a Claus plant and partly to a catalytic reduction zone. The off-gas of the Claus plant is also introduced in said reduction zone wherein any sulphur compounds other than H2S are converted into H2S in the presence of H2and/or CO. The gas mixture leaving the reduction zone is treated for H2S removal in a second absorption zone with the same liquid as applied in said first zone under conditions which are selective in respect of co-absorption of CO2. The H2S containing absorption liquid of said second zone is regenerated in a regeneration zone common to the first and second absorption zone, whereby the cal- culated H2S/CO2 ratio of the feed to the Claus plant is improved.
325891
Cornelisse Roelof
Ouwerkerk Cornelis
Werner Erik S.e.
Shell Canada Limited
Smart & Biggar
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