Removal of hydrogen sulfide from gases

Details Removal of hydrogen sulfide from gases Removal of hydrogen sulfide from gases

B - Operations, Transporting

01

D

252/30, 23/345

B01D 53/34 (2006.01) B01D 53/14 (2006.01)

Patent

CA 1071613

Abstract of the Disclosure Hydrogen sulfide is removed from a gas stream in an oxidation-reduction system by contacting the gas stream with an aqueous alkaline chelated iron solution in which the iron is in the ferric state to absorb hydrogen sulfide and convert it to elemental sulfur which is recovered. The solution is regenerated by aeration. The chelated iron solu- tion contains two different types of chelating agents, on of which is selected to bind ferrous ions so as to prevent precipitation of ferrous sulfide, and the other of which is selected to bind ferric ions so as to prevent precipitation of ferric hydroxide. The absorption step of the process may be operated under either aerobic or anaerobic conditions.

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