| 摘要 |
1. Process for the separation of a ketoxime or aldoxime from a ketoxime- or aldoxime-containing amide mixture, characterized in that the ketoxime or aldoxime is distilled off from the amide mixture at a temperature between 80 degree C and 180 degree C. 2. Process according to claim 1, characterized in that the distillation is conducted under reduced pressure. 3. Process according to claim 1, characterized in that the distillation is steam distillation. 4. Process according to claim 1, characterized in that the distillation is conducted at a temperature between 100 degree C and 160 degree C. 5. Process according to any one of claims 1-4, characterized in that the distillation is conducted in a column with 1-15 theoretical trays. 6. Process according to claim 5, characterized in that the distillation is conducted in a column with 5-15 theoretical trays. 7. Process according to claim 6, characterized in that the pressure drop per theoretical tray is less than 200 Pa. 8. Process according to any one of claims 1-7, characterized in that ketoxime or aldoxime obtained by the distillation is recycled to a reactor for preparation of the corresponding amide. 9. Process according to any one of claims 1-8, characterized in that the distillation is conducted in two stages. |
