Economical purification of bisphenol A
US6806394B2 · kind B2 · utility
5Cited by
3References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2003 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Nov 5, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/685
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process and related apparatus are disclosed for economically producing a very high quality bisphenol A product by a multistage crystallization process utilizing a new cross-flow wash design whereby a high purity wash phenol stream is fed to every washing stage, optionally also in combination with a modified stream flow/recycle design which avoids increased by product production and yield losses otherwise expected from processing increased volumes of wash phenol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.