Controlled dealumination of zeolites
US4533533A · kind A · utility
14Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 1983 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | May 23, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Selective and controlled dealumination of an aluminosilicate zeolite is achieved by filling the pore system of the zeolite with a foreign material, for example coke, removing part of the foreign material from the outer portion of the zeolite, for example by heating in a gas stream comprising oxygen, dealuminating the outer portion, and then removing the remainder of the foreign material. Use of such a partially dealuminated zeolite as catalyst in a toluene disproportionation reaction leads to greater selectivity to paraxylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.