Oxidizer and oxidation process for a desulphurization process
An improved oxidizer for liquid reduction-oxidation desulphurization processes uses a hollow fiber membrane contactor. A pressurized, oxygen containing gas stream is introduced into the interior of the hollow fiber membrane while a liquid reduction-oxidation catalyst solution contacts the exterior of the membrane. Oxygen diffuses through the membrane into the liquid reduction-oxidation catalyst solution whereby the solution is oxidized and can be recycled for further use in a desulphurization process.
1. A process for continuously removing hydrogen sulfide from a gaseous stream comprising the following steps in combination:
a. providing a feed stream containing hydrogen sulfide to a oxidation-reduction process;
b. contacting the feed gas stream with a chelated metal catalyst to produce a first hydrogen sulfide-free gas stream and a second stream comprising elemental sulfur and chelated metal catalyst solution;
c. removing the first hydrogen sulfide-free gas stream from the process;
d. providing a hollow fiber membrane having an interior and an exterior;
e. directing at least a portion of the second stream from step b. to the exterior of the hollow fiber membrane;
f. introducing a pressurized, oxygen containing gas stream into the interior of the hollow fiber membrane such that the oxygen diffuses through the hollow fiber membrane and contacts the second stream; and
g. separating elemental sulfur from the chelated metal catalyst solution.
2. The process of claim 1 further characterized in that at least a portion of the chelated metal catalyst solution from step g. is recycled to contact the feed gas stream.