<p>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 prevent 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.</p>
申请公布号
EP0257124(B1)
申请公布日期
1993.04.28
申请号
EP19860111671
申请日期
1986.08.22
申请人
ARI TECHNOLOGIES, INC. (A CORPORATION OF ILLINOIS)