Process for making nitriles
US9133107B2 · kind B2 · utility
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27Claims
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Key dates
| Filing date | Jun 16, 2011 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Jun 23, 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. The catalyst for the reaction of 1,3-butadiene with hydrogen cyanide to make 3-pentenenitrile is recycled. At least a portion of the recycled catalyst is purified by an extraction process, which separates catalyst degradation products and reaction byproducts, such as mononitriles having 9 carbon atoms, from the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.