Process for oxidizing hydrogen sulfide to sulfur by means of molecular oxygen in the presence of transition metal complexes as catalysts
US3956473A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1973 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Oct 1, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/05
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Catalytic oxidation of hydrogen sulfide to sulfur in homogeneous liquid phase, by means of molecular oxygen, in an organic solvent whose water content is lower than 60% by volume, said liquid phase comprising a solvent selected from amides, phosphoramides, sulfoxides, nitriles and ethers, said oxidation being conducted in the presence of at least one catalyst selected from the two following categories: PA1 A. a chelate of a transition metal selected from the group of metals consisting of iron, manganese, copper and cobalt, the chelate being selected from the group consisting of dialkyldithiocarbamates, alkylxanthates, dithiolates, 8-hydroxyquinolinates and salicylaldimines, PA1 B. a salt of said transition metal of the formula MX.sub.m in which M is the transition metal, X is an anion selected from the group consisting of Cl.sup.-, Br.sup.-, ClO.sub.4.sup.-, NO.sub.3.sup.- and SCN.sup.- and m is 2 or 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.