Phase transfer catalyst recovery
US5030757A · kind A · utility
1Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 7, 1990 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | May 7, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/86
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A quaternary ammonium salt catalyst is recovered from mixtures where the salt is in contact with an aqueous alkaline phase by adding water to completely dissolve the salt and adding base to cause the dissolved catalyst to separate as a hydroxide which forms an oily upper phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.