Process for making nitriles
US9051242B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Jun 16, 2011 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Oct 15, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Adiponitrile is made by reacting 3-pentenenitrile with hydrogen cyanide. The 3-pentenenitrile is made by reacting 1,3-butadiene with hydrogen cyanide and by isomerizing 2-methyl-3-butenenitrile. Both reactions take place in the presence of a catalyst comprising zero valent nickel and a phosphorus-containing ligand. The ligand is partially degraded by hydrolysis or oxidation. Phosphorus-containing ligand degradation products are removed during the production of 3-pentenenitrile and adiponitrile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.