US3625835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of cyclohexanone oxime by plural stage, vacuum distillation per a
Assignee: Stamicarbon BV
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Filing: 1970-06-15
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Granted: 1971-12-07
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Expires: 1990-06-15
Abstract
Abstract There is disclosed a continuous process for preparing cyclohexanone oxime by reacting cyclohexanone with a solution of a hydroxylammonium salt derived from a weak acid, e.g. phosphoric acid. The reaction takes place in counterflow contact, and in the presence of a water-immiscible or poorly water-miscible organic solvent for the oxime formed. An improved process for accomplishing separation of the resulting oxime from the solvent by rectification and apparatus suited for realizing this process.
Inventors
- 👤 Adrianus Tervoort
- 👤 Theodorus Balg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C251/00; C07C251/32; C07C251/34; C07C251/44; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
The process of claim 1 wherein, as a preliminary step, the oxime solution is washed with water.
Claim 2
Dependent Claim
18 words
The process of claim 1 wherein, as a preliminary step, the oxime solution is washed with dilute NH4OH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |