Preparation of para-xylene by toluene methylation
US4935574A · kind A · utility
25Cited by
6References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 13, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Mar 13, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J21/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A silica catalyst that retains its high initial activity for a longer time is obtained by forming the catalyst from an aquasol that was obtained by mixing an alkali metal aluminate with an aqueous solution of alkali metal silicate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.