Process for preparing 4-hydroxyacetophenone oxime with mother liquor recycle
US4994613A · kind A · utility
6Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C251/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel process is disclosed for the preparation of 4-hydroxyacetopheone oxime by reaction of 4-hydroxyacetophenone with a hydroxylamine in caustic wherein the mother liquor obtained after crystallization of the oxime together with the wash water is recycled back and reused. This invention illustrates the criticality of maintaining the reactants in certain critical mol ratios in order to obtain 4-hydroxyacetopheone oxime of acceptable color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.