Low sodium cleavage product
US6825387B2 · kind B2 · utility
3Cited by
18References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2003 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Sep 11, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/82
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Washed cleavage product (WCP) in a phenol manufacturing process is treated to remove sodium ions. The WCP is contacted with a cation exchange resin in hydrogen form, and then with anion exchange resin in free base or hydroxide form, to produce a WCP essentially free of sodium ions. The cation and anion exchange resins are regenerated with acid and caustic, respectively. The treatment improves productivity and product quality of new and existing phenol processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.