Crystallization process
US4016210A · kind A · utility
4Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1975 |
| Grant date | Apr 5, 1977 |
| Priority date | — |
| Expiry date | Oct 23, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C317/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process is provided for the crystallization of bis-(4-chlorophenyl) sulphone from a reaction mixture in which it is formed by reacting chlorobenzene sulphonic acid and chlorobenzene which comprises (i) forming a crystallization liquor from the reaction mixture by adjusting the weight ratio of chlorobenzene to chlorobenzene sulphonic acid of the reaction mixture so as to maximize the quantity of bis-(4-chlorophenyl) sulphone which can crystallize from the liquor at a desired crystallization temperature, and (ii) allowing the bis-(4-chlorophenyl) sulphone to crystallize from the crystallization liquor at the temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.