Process for xylene isomerization using ZSM-23 zeolite
US4599475A · kind A · utility
15Cited by
11References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1985 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Jun 19, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved process is disclosed for the isomerization of xylenes over a zeolite which may contain a platinum group metal. The improvement resides in the use of ZSM-23 zeolite which exhibits enhanced selectivity which inhibits the production of undesired C.sub.9.sup.+ aromatic transalkylation by-products. ZSM-23 having pores substantially unobstructed by silica, such as that made from a forming mixture containing amorphous precipitated silica as a silica source, has been found to be particularly useful in the process of the present invention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.