US2719172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitric acid oxidation to dicarboxylic acids
Assignee: BASF SE
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Filing: 1952-08-30
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Granted: 1955-09-27
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Expires: 1972-08-30
Abstract
No abstract record available.
Inventors
- 👤 Nebe Erich
- 👤 Boehm Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:30
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/316
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR WORKING UP THE MOTHER LIQUORS OBTAINED BY THE OXIDATION OF ALIPHATIC AND CYCLIC COMPOUNDS CONTAINING A CHAIN OF SIX CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF HEXANEDIOL-(1,6), CYCLOHEXANONE, CYCLOHEXANOL, CAPROLACTAM AND CYCLOHEXYLAMINE BY MEANS OF AQUEOUS NITRIC ACID AND SEPARATING THE DICARBOXYLIC ACIDS FORMED BY CONCENTRATING AND COOLING, WHICH PROCESS COMPRISES EVAPORATING SAID MOTHER LIQUORS TO DRYNESS UNDER REDUCED PRESSURE AT TEMPERATURE UP TO 70* C., HEATING THE RESIDUE AT ABOUT 100* C. TO 200* C. UNTIL NO MORE NITROGEN OXIDES ARE SPLIT OFF AND DISTILLING IT BY MEANS OF STEAM UNDER REDUCED PRESSURE UNTIL NO MORE DICARBOXYLIC ACIDS DISTIL OVER.
Claim 2
Dependent Claim
106 words
A PROCESS FOR WORKING UP THE MOTHER LIQUORS OBTAINED BY THE OXIDATION OF ALIPHATIC AND CYCLIC COMPOUNDS CONTAINING A CHAIN OF SIX CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF HEXANEDIOL-(1,6), CYCLOHEXANONE, CYCLOHEXANOL, CAPROLACTAM AND CYCLOHEXYLAMINE BY MEANS OF AQUEOUS NITRIC ACID AND SEPARATING THE DICARBOXYLIC ACIDS FORMED BY CONCENTRATING AND COOLING, WHICH PROCESS COMPRISES EVAPORATING SAID MOTHER LIQUORS TO DRYNESS UNDER REDUCED PRESSURE AT TEMPERATURE UP TO 70* C., HEATING THE RESIDUE AT ABOUT 100* C. TO 200* C. UNTIL NO MORE NITROGEN OXIDES ARE SPLIT OFF AND DISTILLING IT BY MEANS OF STEAM UNDER REDUCED PRESSURE UNTIL NO MORE DICARBOXYLIC ACIDS DISTIL OVER.
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) | 1958-09-26 | 1959-03-28 | 1959-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-26 | 1963-03-28 | 1963-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-26 | 1967-03-28 | 1967-09-27 | $7700.00 | Window Closed / Lapsed |