Process for producing pentenenitriles
US9932298B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2013 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | May 16, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/90
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides methods useful in the industrial scale process for hydrocyanation of butadiene to adiponitrile for recycle of unwanted byproduct 2-methyl-3-butenenitrile (2M3BN) by conversion to process intermediate pentenenitrile. The invention provides a process for generating catalysts useful for carrying out the hydrocyanation of butadiene to adiponitrile, the process comprising contacting the 2M3BN and a solution of a nickel-ligand catalyst in cis-2-pentenenitrile (cis-2PN), trans-2-pentenenitrile (trans-2PN), or a mixture thereof. The improved methods of the invention can provide improved catalyst solubility for bidentate ligands without a requirement for a Lewis acid catalyst promoter such as zinc chloride to be present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.