Xylene separation process
US10392324B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 17, 2017 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | May 17, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2529/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process to separate paraxylene from a mixture of paraxylene, metaxylene, orthoxylene, and ethylbenzene in a commercial simulated moving bed apparatus in a reduced number of beds is provided, allowing an additional separation to be conducted in the remaining beds. This additional separation may separate another xylene isomer, ethylbenzene, or a non-aromatic C8+ hydrocarbon from the raffinate stream produced by the first separation. A PowerFeed process is used to recover paraxylene in a first adsorption zone containing 8-16 beds of a conventional 24-bed simulated moving bed adsorption apparatus, and then a second separation may be conducted in a second adsorption zone containing the remaining beds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.