Hydrogen sulfide removal

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B - Operations, Transporting

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B01J 31/28 (2006.01) B01D 53/14 (2006.01) B01D 53/34 (2006.01) B01D 53/52 (2006.01) B01D 53/77 (2006.01) B01J 31/22 (2006.01) B01J 38/12 (2006.01) C01B 17/04 (2006.01) C01B 17/05 (2006.01) C10K 1/10 (2006.01)

Patent

CA 1227783

ABSTRACT OF THE DISCLOSURE In a cyclic hydrogen sulfide oxidation-catalyst regeneration process using an aqueous chelated polyvalent metal catalyst solution, excessive degradation of the aminopolycarboxylic acid chelating agent is prevented by incorporating in the solution an effective amount of a stabilizing agent capable of retarding or preventing rupture of nitrogen-carbon bonds in the chelating agent during oxidative regeneration of the catalyst solution. Alkaline thiosulfates are the preferred stabilizing agents. Particularly good results are obtained using an alkaline thiosulfate stabilizer in a catalyst solution comprising the dimer form of the NTA-iron complex.

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