Process for operating the epoxidation of ethylene
US6372925B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Dec 12, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is provided a process for the vapor phase oxidation of ethylene to ethylene oxide in the presence of a supported highly selective silver-based catalyst, the process comprising operating fresh catalyst for an initial operation phase, then operating at a further operation phase when the catalyst has reached an advanced aged defined by a cumulative ethylene oxide production exceeding 1.5 kT EO per m3 of catalyst. In the further operation phase the composition of the reaction mixture is changed to contain from 1.1 to 4 times the concentration of ethylene used in the initial operation phase and the corresponding optimised and safe concentration of oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.