Process for the preparation of tetrabromo-4,4'-alkylidenediphenols
US5068463A · kind A · utility
22Cited by
1References
7Claims
0Family size
Inventor
Key dates
| Filing date | Oct 5, 1990 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Oct 5, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/72
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the production of tetrabromo-4,4'-alkylidenediphenols, especially tetrabromobisphenol A (TBBA), from the corresponding alkylidenediphenols by oxidative bromination with Br.sub.2, HBr.sub.3 or HBr and aqueous hydrogen peroxide in the presence of an organic solvent. The process is characterized by washing the organic phase containing dissolved tetrabromo-4,4'-alkylidenediphenol with an aqeuous alkali sulphite solution, preferably at 50.degree. to 90.degree. C. Through this washing treatment, the tetrabromo compound is obtained in higher purity; in addition, the mother liquor can be recycled without difficulty.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.