Process for the synthesis of glycolonitrile
US7368492B2 · kind B2 · utility
1Cited by
10References
18Claims
0Family size
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Key dates
| Filing date | Dec 21, 2005 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | May 1, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C253/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process to prepare substantially pure glycolonitrile in an aqueous medium is provided by reacting hydrogen cyanide and formaldehyde. The formaldehyde feed stream is heated prior to reacting with hydrogen cyanide, resulting in an aqueous glycolonitrile solution with fewer impurities, especially less unreacted formaldehyde, than is obtained by other methods. The process enables production of an aqueous glycolonitrile solution that requires less post-reaction purification (if any at all) prior to enzymatically converting the glycolonitrile into glycolic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.