Ammoxidation process for producing acetonitrile
US5756802A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Nov 25, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Acetonitrile is produced directly from alkanes or alkenes by ammoxidation over a catalyst which is a silica-alumina exchanged with a metal of Period 4, Groups VIIA and VIII of the Periodic Table. The silica-alumina can be amorphous but is preferably crystalline zeolite. Preferred zeolite include ZSM-5, beta, NU-87 and USY. Cobalt is the favored metal for exchange. Particularly good results are obtained when the zeolite has been modified with a surface coating of silicon oxides prior to the metal exchange or modified with a boron or phosphorous containing compound followed by calcination. Ammoxidation of alkanes produce alkenes as a byproduct which can be recycled to the reaction to increase acetonitrile yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.