US3899536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2,4,6,2{40 ,4{40 ,6{40 -hexanitro-diphenylamine
Assignee: Societe Nationale des Poudres et Explosifs
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Filing: 1972-05-08
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Granted: 1975-08-12
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Expires: 1992-05-08
Abstract
Abstract A process for preparing substantially pure 2,4,6,2'',4'',6''hexanitro-diphenylamine, commonly known as Hexyl, a thermostable explosive, comprises two nitration stages, in the first of which 2,4,6-trinitrodiphenylamine is nitrated with relatively dilute nitric acid to form pentanitro-diphenylamine and in the second of which the intermediate product is nitrated with concentrated nitric acid. The Hexyl obtained is substantially free of undesired isomers.
Inventors
- 👤 Hubert Girardon
- 👤 Jean Marie Emeury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:15
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C07C209/76
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A PROCESS FOR THE PREPARATION OF HEXYL OF MELTING POINT 252*C WHICH CONSISTS OF A FIRST NITRATION STAGE IN WHICH 2,4,6TRINITRO-DIPHENYLAMINE IS NITRATED TO PENTANITRODIPHENYLAMINE WITH AQUEOUS NITRIC ACID HAVING A CONCENTRATION OF FROM 45 TO 65% OF NITRIC ACID BY WEIGHT USING A NITRIC ACID: TRINITRODIPHENYLAMINE WEIGHT RATIO OF GROM 4 TO 13 AT A TEMPERATURE OF FROM 75*-80*C, NITRATION BEING TERMINATED AFTER 1 TO 3 HOURS, AND SECOND NITRATION STAGE IN WHICH THE PENTANITRODIPHENYLAMINE OBTAINED IS NITRATED TO 2,4,6,2'',4'',6''-HEXANITRODIPHENYLAMINE WITH NITRIC ACID HAVING A CONCENTRATION OF FROM 90 TO 100% BY WEIGHT OF NITRIC ACID USING A NITRIC ACID: PENTANITRO-DIPHENYLAMINE WEIGHT RATIO OF FROM 4 TO 10 AT A TEMPERATURE OF FROM 50* TO 70*C, NITRATION BEING TERMINATED AFTER 1/2 TO 3 HOURS.
Claim 2
Dependent Claim
125 words
A PROCESS FOR THE PREPARATION OF HEXYL OF MELTING POINT 252*C WHICH CONSISTS OF A FIRST NITRATION STAGE IN WHICH 2,4,6TRINITRO-DIPHENYLAMINE IS NITRATED TO PENTANITRODIPHENYLAMINE WITH AQUEOUS NITRIC ACID HAVING A CONCENTRATION OF FROM 45 TO 65% OF NITRIC ACID BY WEIGHT USING A NITRIC ACID: TRINITRODIPHENYLAMINE WEIGHT RATIO OF GROM 4 TO 13 AT A TEMPERATURE OF FROM 75*-80*C, NITRATION BEING TERMINATED AFTER 1 TO 3 HOURS, AND SECOND NITRATION STAGE IN WHICH THE PENTANITRODIPHENYLAMINE OBTAINED IS NITRATED TO 2,4,6,2'',4'',6''-HEXANITRODIPHENYLAMINE WITH NITRIC ACID HAVING A CONCENTRATION OF FROM 90 TO 100% BY WEIGHT OF NITRIC ACID USING A NITRIC ACID: PENTANITRO-DIPHENYLAMINE WEIGHT RATIO OF FROM 4 TO 10 AT A TEMPERATURE OF FROM 50* TO 70*C, NITRATION BEING TERMINATED AFTER 1/2 TO 3 HOURS.
Claim 3
Dependent Claim
26 words
A process according to claim 1, in which the concentration of the nitric acid used in the first stage is from 50 to 55% by weight.
Claim 4
Dependent Claim
22 words
A process according to claim 1, in which the weight ratio used in the first nitration stage is from 5 to 7.
Claim 5
Dependent Claim
19 words
A process according to claim 1, in which the first stage is terminated after 1 to 1 1/2 hours.
Claim 6
Dependent Claim
26 words
A process according to claim 1, in which the concentration of the nitric acid used in the second stage is from 97 to 99% by weight.
Claim 7
Dependent Claim
22 words
A process according to claim 1, in which the weight ratio used in the second nitration stage is from 5 to 7.
Claim 8
Dependent Claim
22 words
A process according to claim 1, in which the second stage is carried out at a temperature of from 60* to 65*C.
Claim 9
Dependent Claim
18 words
A process according to claim 1, in which the second stage is terminated after 1 to 2 hours.
References Cited (Backward Citations)
US1326947A
Cited
US2612523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |