Process for separating dichlorodiphenylsulfone isomers
US4876390A · kind A · utility
5Cited by
12References
9Claims
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Key dates
| Filing date | Aug 19, 1988 |
| Grant date | Oct 24, 1989 |
| Priority date | — |
| Expiry date | Aug 19, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C315/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the liquid phase adsorptive separation of 4,4'-dichlorodiphenylsulfone (4,4'-DCDPS) from crystallization residue feed mixture also containing other DCDPS isomers. The feed is contacted with an X or Y type zeolite, substituted with a cation of a Group IA or IIA metal or ammonium. The other isomers are selectively adsorbed to the substantial exclusion of 4,4'-DCDPS. The 4,4'-DCDPS is recovered in high purity by fractionating the raffinate to recover the desorbent, aliphatic alcohols having 4-8 carbon atoms either used alone or diluted with an aromatic compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.