Method for recovering material values from bisphenol tars
US6303835A · kind A · utility
7Cited by
4References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2000 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Sep 11, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Phenol and isopropenylphenol are recovered from BPA tars by sparging the fluidized BPA tar while heating in the presence of a basic catalyst. Sparging dramatically increases the efficiency of phenol and isopropenylphenol recovery. Recovered isopropenylphenol may be converted to bisphenol A in the distillate by reaction with phenol and an acidic catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.