Liquid phase process for C8 alkylaromatic isomerization
US6872866B1 · kind B1 · utility
29Cited by
25References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2003 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Dec 15, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A liquid or partially liquid phase process for isomerizing a non-equilibrium mixture of xylenes and ethylbenzene uses a zeolitic catalyst system preferably based on zeolite beta and on pentasil-type zeolite. The invention obtains an improved yield of para-xylene from the mixture relative to prior art processes in a more economical manner. A preferred beta zeolite is a surface-modified zeolite beta resulting from acid washing of a templated native zeolite at conditions insufficient to effect bulk dealumination. A preferred pentasil zeolite is a MTW-type with a silica-to-alumnina ratio between 20 and 45.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.