Method of regenerating a degraded working solution for the production of hydrogen peroxide
US3965251A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1973 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | Aug 2, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B15/023
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A working solution comprising anthraquinone and its derivatives, used for the production of hydrogen peroxide on becoming degraded by formation of non-effective anthraquinone is generated by an auto-oxidation process employing anthraquinone, which comprises: PA1 Contacting, at a temperature of below 130.degree.C., and in the presence of a catalyst comprising a metal selected from a platinum group and supported on a carrier, said degraded working solution, which comprises non-effective anthraquinone and tetrahydroanthraquinone with an olefinic compound whose hydrogenation product is gaseous at said contact temperature and PA1 Subsequently, contacting the thus treated working solution, at a temperature above 130.degree.C., and in the presence of a catalyst comprising a metal selected from the platinum group and supported on a carrier, with an olefinic compound whose hydrogenation product is gaseous at said contact temperature, PA1 Said method being characterized by the fact that at a temperature below 130.degree.C., the regeneration of non-effective anthraquinone is accelerated much faster than the dehydrogenation reaction of tetrahydroquinone and therefore, at a pont in time, when a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.