Process for selective diisopropylation of naphthyl compounds using shape selective acidic crystalline molecular sieve catalysts
US5026942A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Dec 12, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2529/85
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The selective isopropylation of a naphthyl compound to diisopropylnaphthalene enhanced in the 2,6-diisopropylnaphthalene isomer is obtained in the presence of an acidic crystalline molecular sieve catalyst having twelve membered oxygen rings. The catalyst pore aperture dimension range from 5.5 .ANG. to 7.0 .ANG.. The user of these shape selective catalysts results in a diisopropylnephthalene stream which is enhanced in .beta. isomers and enhanced in the desired 2,6-diisopropylnaphthalene isomer. A particularly preferred catalyst is synthetic Mordenite having a specific Si/Al ratio and NMR characteristics. Specific catalyst modifications are also described to improve selectivity to the desired 2,6-diisopropylnaphthalene isomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.