US4073624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for fluorinating coal
Assignee: United States Department of Energy
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Filing: 1976-12-21
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Granted: 1978-02-14
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Expires: 1996-12-21
Abstract
Abstract Coal is fluorinated by contact with fluorine gas at low pressure. After pial fluorination, when the reaction rate has slowed, the pressure is slowly increased until fluorination is complete, forming a solid fluorinated coal of approximate composition CF 1 .55 H 0 .15. The fluorinated coal and a solid distillate resulting from vacuum pyrolysis of the fluorinated coal are useful as an internal standard for mass spectrometric unit mass assignments from about 100 to over 1500.
Inventors
- 👤 John L. Huston
- 👤 Robert G. Scott
- 👤 Martin H. Studier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:23
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; Y; Y10; Y10T; Y10T436/00; Y10T436/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A method for fluorinating coal comprising: contacting the coal with elemental fluorine at a temperature between 0° and 80° C and at an initial pressure of from 50 to 300 mm Hg; maintaining the initial pressure of the fluorine until the coal is partially fluorinated; increasing the pressure of the fluorine over the partially fluorinated coal slowly to from 1100 to 1600 mm Hg; and maintaining the pressure of the fluorine for a period of time sufficient to completely fluorinate the coal, thereby forming fluorinated coal.
Claim 2
Independent Claim
86 words
A method for fluorinating coal comprising: contacting the coal with elemental fluorine at a temperature between 0° and 80° C and at an initial pressure of from 50 to 300 mm Hg; maintaining the initial pressure of the fluorine until the coal is partially fluorinated; increasing the pressure of the fluorine over the partially fluorinated coal slowly to from 1100 to 1600 mm Hg; and maintaining the pressure of the fluorine for a period of time sufficient to completely fluorinate the coal, thereby forming fluorinated coal.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the pressure is increased slowly over a period of about 1 to 4 days.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the coal is selected from the group consisting of anthracite and bituminous.
Claim 5
Dependent Claim
11 words
The fluorinated coal product produced by the method of claim 1.
Claim 6
Dependent Claim
27 words
The method of claim 3 including the additional steps of heating the fluorinated coal under a vacuum to pyrolytic temperature and collecting the fluorinated coal decomposition product.
Claim 7
Dependent Claim
10 words
The fluorinated distillate produced by the method of claim 5.
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) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |