US3056837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing hexamethylenediamine
Assignee: Stamicarbon BV
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Filing: 1959-04-24
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Granted: 1962-10-02
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Expires: 1979-04-24
Abstract
No abstract record available.
Inventors
- 👤 Johannes W M Steeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:51
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/44; C07C209/48; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A PROCESS FOR PREPARING HEXAMETHYLENEDIAMINE BY THE CATALYST HYDROGENATION OF A NITRILE STARTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF ADIPONITRILE AND REAMINOCARPRONITRILE IN THE LIQUID PHASE AND AT PRESSURES WITHIN THE RANGE OF 20 ATMOSPHERES TO 75 ATMOSPHERES USING A FINELY DIVIDED METAL CATALYST SELECTED FROM THE GROUP CONSISTING OF RANEY NICKEL AND RANEY COBALT, THE IMPROVEMENT OF: CARRYING OUT SAID HYDROGENATION PROCESS IN A HYDROGENATION REGION WHICH INCLUDES AT LEAST ONE HYDROGENATION ZONE; DICHARGING FROM THIS REGION A SUSPENSION OF THE CATALYST IN HYDROGENATION REACTIO PRODUCT; MAINTAINING THE THUS DISCHARGED SUSPENSION UNDER HYDROGEN PRESSURE; SEPARATING PART OF THE HYDROGENAATION PRODUCT FROM SAID DISCHARGE SUSPENSION; RECYCLING THE RESULTING SUSPENSION INTO SAID HYDROGENATION REGION; AND ADDING FURTHER STARTING MATERIAL TO SAID RECYCLED SUSPENSION BEFORE THE SAME IS DELIVERED TO SAID HYDROGENATION REGION.
Claim 2
Dependent Claim
133 words
IN A PROCESS FOR PREPARING HEXAMETHYLENEDIAMINE BY THE CATALYST HYDROGENATION OF A NITRILE STARTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF ADIPONITRILE AND REAMINOCARPRONITRILE IN THE LIQUID PHASE AND AT PRESSURES WITHIN THE RANGE OF 20 ATMOSPHERES TO 75 ATMOSPHERES USING A FINELY DIVIDED METAL CATALYST SELECTED FROM THE GROUP CONSISTING OF RANEY NICKEL AND RANEY COBALT, THE IMPROVEMENT OF: CARRYING OUT SAID HYDROGENATION PROCESS IN A HYDROGENATION REGION WHICH INCLUDES AT LEAST ONE HYDROGENATION ZONE; DICHARGING FROM THIS REGION A SUSPENSION OF THE CATALYST IN HYDROGENATION REACTIO PRODUCT; MAINTAINING THE THUS DISCHARGED SUSPENSION UNDER HYDROGEN PRESSURE; SEPARATING PART OF THE HYDROGENAATION PRODUCT FROM SAID DISCHARGE SUSPENSION; RECYCLING THE RESULTING SUSPENSION INTO SAID HYDROGENATION REGION; AND ADDING FURTHER STARTING MATERIAL TO SAID RECYCLED SUSPENSION BEFORE THE SAME IS DELIVERED TO SAID HYDROGENATION REGION.
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) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |