US3032586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of dinitrotoluene to toluylene diamine
Assignee: Bayer AG
•
Filing: 1957-04-18
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Granted: 1962-05-01
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Expires: 1977-04-18
Abstract
No abstract record available.
Inventors
- 👤 Dierichs Helmut
- 👤 Holzrichter Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:05
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE IMPROVED METHOD OF MAKING TOLUYLENE DIAMINE BY HYDROGENATING DINITROTOLUENE IN THE PRESENCE OF A CATALYST COMPRISING, SUBJECTING A FLOWING STREAM OF A SOLUTION OF AN EUTECTIC MIXTURE OF DINITROTOLUENE AND TOLUYLENE DIAMINE IN AN INERT ORGANIC SOLVENT FOR THE TWO COMPOUNDS AND HYDROGEN TO A PRESSURE OF AT LEAST ABOUT 50 ATMOSPHERES AND A TEMPERATURE OF FROM ABOUT 80*C. TO ABOUT 120*C. WHILE SAID SOLUTION HAS PARTICLES OF RANEY NICKEL SUSPENDED THEREIN UNTIL NITRO GROUPS OF THE DINITROTOLUENE HAVE BEEN CONVERTED INTO AMINO GROUPS, AND THEREAFTER SEPARATING THE REACTION PRODUCT FROM THE LIQUID PHASE AND ANY RESIDUAL RANEY NICKEL.
Claim 2
Dependent Claim
100 words
THE IMPROVED METHOD OF MAKING TOLUYLENE DIAMINE BY HYDROGENATING DINITROTOLUENE IN THE PRESENCE OF A CATALYST COMPRISING, SUBJECTING A FLOWING STREAM OF A SOLUTION OF AN EUTECTIC MIXTURE OF DINITROTOLUENE AND TOLUYLENE DIAMINE IN AN INERT ORGANIC SOLVENT FOR THE TWO COMPOUNDS AND HYDROGEN TO A PRESSURE OF AT LEAST ABOUT 50 ATMOSPHERES AND A TEMPERATURE OF FROM ABOUT 80*C. TO ABOUT 120*C. WHILE SAID SOLUTION HAS PARTICLES OF RANEY NICKEL SUSPENDED THEREIN UNTIL NITRO GROUPS OF THE DINITROTOLUENE HAVE BEEN CONVERTED INTO AMINO GROUPS, AND THEREAFTER SEPARATING THE REACTION PRODUCT FROM THE LIQUID PHASE AND ANY RESIDUAL RANEY NICKEL.
References Cited (Backward Citations)
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Cited
US2458214A
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US2619503A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |