Isomerization of aromatic compounds over ZSM-22 zeolite
US5254770A · kind A · utility
24Cited by
20References
15Claims
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Key dates
| Filing date | Sep 19, 1984 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Sep 19, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A mixture of aromatic hydrocarbons, comprising xylenes, is isomerized in the presence of ZSM-22 zeolite to produce a product stream wherein the proportion of para-xylene is substantially equal to the equilibrium ratio of the para-isomer. The process is conducted at about 500.degree. F. to about 1100.degree. F., at about 0 to about 3000 psig, optionally in the presence of hydrogen, and also optionally with the catalyst comprising about 0.005% to about 5.0% of a metal, e.g., platinum, palladium or cobalt, based on total catalyst weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.