Process for separating paraxylene comprising at least one crystallization stage at high temperature and at least one clay treatment upstream from the adsorption zone
US6063978A · kind A · utility
3Cited by
4References
46Claims
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Key dates
| Filing date | Jun 30, 1997 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Jun 30, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for separating paraxylene at very high purity from a charge of xylene isomers, comprising a selective adsorption of a fraction that is rich in paraxylene, at least one high-temperature crystallization of this fraction, and an isomerization of the fraction depleted of paraxylene, recycling the mother liquor to the selective adsorption optionally via a clay treatment followed optionally by a distillation of the treatment effluent, and optionally introducing the mother liquor into a distillation unit, wherein the crystallization can comprise several high-temperature stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.