Regeneration of a anthraquinone working solution by continuous multi-stage thin film distillation
US3949063A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Nov 6, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B15/023
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for regenerating working solutions used in cyclic processes for the manufacture of hydrogen peroxide using anthraquinones, the process consisting of a first distillation stage in which the solvent is separated under a pressure not greater than atmospheric pressure, and a second distillation stage in which the quinones and "light degraded products" are separated under a lower pressure. All the distillation products are used as a new working solution, the vapors of the second distillation stage being condensed on a liquid film of constantly renewed cold solvent originating from condensable vapors of the first distillation stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.