Hydrogen regeneration of coke-selectivated crystalline aluminosilicate catalyst
US4358395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1978 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Sep 11, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is provided for regeneration of a catalyst comprising a crystalline aluminosilicate zeolite characterized by a silica to alumina mole ratio of at least about 12, a constraint index, as hereinafter defined, within the approximate range of 1 to 12, which catalyst has undergone controlled precoking by exposing the same to a thermally decomposable organic compound at a temperature in excess of the decomposition temperature of said compound but less than about 1200.degree. F., at a hydrogen to organic compound mole ratio of between 0 and 1 to deposit at least about 1 weight percent coke thereon, such precoked catalyst having been deactivated by formation of a carbonaceous deposit thereon as a result of use of the same in catalytically converting an organic charge under conditions less severe, i.e., at a lower temperature and/or a higher hydrogen concentration than those employed during said precoking which comprises contacting the aged catalyst with an atmosphere comprising hydrogen at a temperature between about 800.degree. F. and about 1200.degree. F. and a pressure between about 0 and about 2000 psig for a period of time sufficient to at least partially restore the activity …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.