US3873626A
Expired / Lapsed
US
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Purification of bis(2-fluoro-2,2-dinitroethyl)formal
Assignee: United States Department of the Navy
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Filing: 1971-07-29
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Granted: 1975-03-25
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Expires: 1991-07-29
Abstract
Abstract Bis(2-fluoro-2,2-dinitroethyl)formal is purified by contacting impure bis(2-fluoro-2,2-dinitroethyl)formal dissolved in an inert solvent with an acidic dichromate solution.
Inventors
- 👤 Horst G Adolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:51
CPC Classifications
C; C07; C07C; C07C201/00; C07C201/06; C07C201/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
THE METHOD OF PURIFYING BIS(2-FLUORO-2,2DINITROETHYL)FORMAL FROM A MIXTURE COMPRISING BIS(2-FLUORO2,2-DINITRKOETHYL)FORMAL AND ITS OXYMETHYLENE HOMOLOG 1,9DIFLUORO-1,1,9,9-TETRANITRO-3,5,7-TRIOXANNONANCE COMPRISING: CONTACTING SAID MIXTURE IN AN INERT SOLVENT WITH DICHROMATE WHICH IS DISSOLVED IN A RELATIVELY STRONG ACID SOLUTION WHICH IS NOT ATTACKED BY DICHROMATE.
Claim 2
Independent Claim
40 words
THE METHOD OF PURIFYING BIS(2-FLUORO-2,2DINITROETHYL)FORMAL FROM A MIXTURE COMPRISING BIS(2-FLUORO2,2-DINITRKOETHYL)FORMAL AND ITS OXYMETHYLENE HOMOLOG 1,9DIFLUORO-1,1,9,9-TETRANITRO-3,5,7-TRIOXANNONANCE COMPRISING: CONTACTING SAID MIXTURE IN AN INERT SOLVENT WITH DICHROMATE WHICH IS DISSOLVED IN A RELATIVELY STRONG ACID SOLUTION WHICH IS NOT ATTACKED BY DICHROMATE.
Claim 3
Dependent Claim
17 words
The method of claim 1 further including the step of separating said bis(2-fluoro-2,2-dinitroethyl)formal from the reaction solution.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said dichromate is provided by a reagent selected from the group consisting of sodium dichromate and potassium dichromate.
Claim 5
Dependent Claim
24 words
The method of claim 2 wherein said dichromate is provided By a reagent selected from the group consisting of sodium dichromate and potassium dichromate.
Claim 6
Dependent Claim
13 words
The method of claim 3 wherein said dichromate is provided by sodium dichromate.
Claim 7
Dependent Claim
13 words
The method of claim 4 wherein said dichromate is provided by sodium dichromate.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein said relatively strong acid is selected from the group consisting of sulfuric acid, phosphoric acid, perchloric acid, nitric acid and trifluoroacetic acid.
Claim 9
Dependent Claim
28 words
The method of claim 2 wherein said relatively strong acid is selected from the group consisting of sulfuric acid, phosphoric acid, perchloric acid, nitric acid and trifluoroacetic acid.
Claim 10
Dependent Claim
14 words
The method of claim 1 wherein said relatively strong acid is 70-90% sulfuric acid.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein said relatively strong acid is 85% sulfuric acid.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |