Process for preparing cycloalkanone oximes
US4108895A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1975 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Oct 23, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel process for preparing cycloalkanone oximes is disclosed. The process comprises PA1 (1) contacting a nitrogen compound selected from the group consisting of nitrogen oxides or nitrosyl compounds with an aqueous or an alcoholic solution containing stannous, copper and chlorine ions to prepare hydroxylamine, PA1 (2) allowing a cycloalkanone to react with the hydroxylamine to form an cycloalkanone oxime, PA1 (3) separating the cycloalkanone oxime from the reaction mixture by extraction with an organic solvent at a pH of less than 4.5, PA1 (4) recovering the cycloalkanone oxime from the extract of the step (3), PA1 (5) treating the raffinate of the step (3) under a reducing condition for conversion of stannic ion formed in the step (1) to stannous ion, and PA1 (6) recycling the stannous ion to the step (1) The process does not produce ammonium salt as a by-product because the cycloalkanone oxime can be separated from the reaction mixture without neutralization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.