Kill-gas introduction to a fluidized bed reactor containing chromium oxide catalyst
US5336738A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1991 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Aug 2, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for stopping an olefin polymerization which is carried out in a low pressure gas phase reactor, which process comprises introducing an effective quantity of deactivating agent into the reactor, characterized in that the olefin polymerisation is carried out using a chromium oxide catalyst and in that the deactivating agent is selected from oxygen, ammonia, water and carbon monoxide and is introduced over a relatively short period of time. The deactivating agent is preferably introduced into the polymerization reactor in a quantity such that in the reactor the weight ratio of the deactivating agent to the catalyst is at least 0.001.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.