Methylation of toluene to para-xylene catalyzed by crystalline silica
US4444989A · kind A · utility
15Cited by
3References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1979 |
| Grant date | Apr 24, 1984 |
| Priority date | — |
| Expiry date | Apr 20, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved catalytic process for making para-xylene from toluene and a methylating agent employing the described crystalline silica as catalyst, said catalyst optionally promoted by one or more compounds of arsenic, phosphorus, magnesium, boron, antimony and amorphous silica. Preferred promoters are boron compounds, antimony compounds, and amorphous silica.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.