Separation process by fractional crystallization
US3959978A · kind A · utility
11Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1972 |
| Grant date | Jun 1, 1976 |
| Priority date | — |
| Expiry date | Apr 25, 1992 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A crystallisable component, for example paraxylene, is separated from solution by chilling, separating crystals, washing them, chilling the mother liquor in the presence of wash liquid, separating further crystals and washing them. The invention enables concentrated solutions to be handled easily by keeping the proportions of crystals at each crystallisation stage low without requiring two separations of wash liquid from mother liquor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.