Method for recovering a gaseous boron trifluoride bf.sub.3 and the usage of the product formed in the method
US5254784A · kind A · utility
23Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1991 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Dec 20, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J27/32
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a method for removing a boron trifluoride from the exhaust gases of a vacuum pump, which gases have been obtained when polymerizing .alpha.-olefines by using a BF.sub.3 -alcohol complex as a catalyst. In a vacuum distillation, the underpressure is achieved by means of a pump sealed with a fluid ring or by means of fluid jet with a torque or ejector pump, possibly assisted by a mechanical blaster, such as a propellant circulating pump. In this pump, the fluid ring or the fluid jet is formed by a cocatalyst forming a complex with the BF.sub.3 catalyst, which cocatalyst is an alcohol, preferably butanol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.