Xylene producing process having staged catalytic conversion of ethylbenzene
US4783568A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1987 |
| Grant date | Nov 8, 1988 |
| Priority date | — |
| Expiry date | Sep 25, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for the production of a desired xylene isomer, preferably paraxylene, and high quality benzene. The desired isomer (11) is recovered from the feed (1) and recycle (3) streams in a xylene separation zone (2). The raffinate (5) from the separation zone is passed into a catalytic xylene isomerization zone (6). The isomerization zone effluent stream is passed into a high severity transalkylation zone (14) which contains a catalyst comprising both a ZSM-5 zeolite and mordenite. Ethylbenzene in the feed stream is subjected to staged conversion in the two catalytic reaction zones to both xylenes and benzene. The overall ethylbenzene conversion efficiency is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.