Tetrabromobisphenol-A process
US5017728A · kind A · utility
23Cited by
10References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Aug 20, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00051
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Tetrabromobisphenol-A is made in high purity and increased yield by adding a methanol-bromine solution to a methanol bisphenol-A solution with vigorous agitation. The amount of methanol in the reaction vessel is adjusted to yield a ratio of tetrabromobisphenol-A to methanol when the reaction is substantially complete that provides a lower amount of Hbr impurity in the tetrabromobisphenol-A product. An increased recovery of tetrabromobisphenol-A product is achieved by adjusting the water added to the reaction vessel when the bromination reaction is essentially complete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.