Method of purification of dihydric phenols
US7528210B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Mar 30, 2006 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Jan 3, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process comprising the steps of dissolving a dihydric phenol in a solvent to form a solution A; contacting the solution A with a zeolite; filtering the zeolite to form a solution B; adding an anti-solvent to the solution B to form a solution C; and distilling the solution C; wherein the dihydric phenol is represented by Formula (I):wherein R is a hydrogen atom or an aliphatic functionality having 1 to 6 carbon atoms and n is an integer having a value 1 to 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.