Two-stage catalytic process for recovering sulfur from an H...

Details Two-stage catalytic process for recovering sulfur from an H... Two-stage catalytic process for recovering sulfur from an H...

2006-11-21

2006-11-21

Vanoy, Timothy C (Department: 1754)

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

C423S567100, C423S569000, C423S570000, C423S576200, C423S576800, C422S169000, C422S170000, C422S171000, C422S172000, C422S177000, C422S198000, C422S198000, C422S211000

Reexamination Certificate

active

07138101

ABSTRACT:
Apparatus and process for recovering elemental sulfur from a H2S-containing waste gas stream are disclosed. The apparatus preferably comprises a first reaction zone for carrying out the catalytic partial oxidation of H2S, a second reaction zone for the catalytic partial reduction of any incidental SO2produced in the first reaction zone, and a cooling zone including a sulfur condenser. According to a preferred embodiment of the process, a mixture of H2S and O2contacts a catalyst in the first reaction zone very briefly (i.e, less than about 200 milliseconds) producing primarily S0and H2O. Some SO2is also present in the first stage product gas mixture. A reductant gas (e.g. CO, or CH4or natural gas) is fed together with the first stage product gas mixture to a second catalytic reaction zone where the partial reduction of the SO2component to elemental sulfur and CO2is carried out.

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