Zeolitic catalyst composition of improved shape selectivity
US5034362A · kind A · utility
8Cited by
2References
14Claims
0Family size
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Key dates
| Filing date | Aug 18, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Aug 18, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2529/76
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There are provided aromatic conversion reactions for preparation of dialkylbenzenes, such as xylene and ethyltoluene, of enhanced para isomer content with a zeolitic catalyst composition of improved shape selectivity. The catalysts comprise certain zeolites which have been calcined at a high temperature of at least 649.degree. C. (i.e., 1200.degree. F.). These zeolites have a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12. Examples of such zeolites include ZSM-5 and ZSM-11.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.