US4859747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorination of ethers in the presence of hydrogen fluoride scavengers
Assignee: Exfluor Research Corp
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Filing: 1988-05-24
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Granted: 1989-08-22
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Expires: 2008-05-24
Abstract
Abstract The direct fluorination of ethers in the presence of hydrogen fluoride (HF) scavengers such as sodium fluoride and potassium fluoride is disclosed. Ethers (liquid or solid) are either mixed with the HF scavenger, coated onto the HF scavenger or placed separately with the HF scavenger into a fluorination reactor and fluorinated by exposure to elemental fluorine. The HF scavenger permits use of more severe fluorination conditions than would be possible in the absence of the scavenger, i.e. higher initial fluorine, less gradual increases in fluorine gas concentrations and greater fluorine gas flow rates.
Inventors
- 👤 Thomas R. Bierschenk
- 👤 Timothy J. Juhlke
- 👤 Richard J. Lagow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:03
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C07; C07C; C07C41/00; C07C41/01; C07C41/18; C07C41/22; C08G65/002; C08G65/005; C08G65/007; C08G65/321; C08G65/323; C08G65/3233; C08G65/3236
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
59 words
A method of fluorinating a hydrocarbon ether, comprising contacting the hydrocarbon ether, in the presence of a hydrogen fluoride scavenger, with fluorine gas under conditions sufficient for fluorination of ether, the amount of hydrogen fluoride scavenger being sufficient to react with hydrogen fluoride formed during the fluorination and to prevent charring or combustion of the ether during the fluorination.
Claim 2
Independent Claim
59 words
A method of fluorinating a hydrocarbon ether, comprising contacting the hydrocarbon ether, in the presence of a hydrogen fluoride scavenger, with fluorine gas under conditions sufficient for fluorination of ether, the amount of hydrogen fluoride scavenger being sufficient to react with hydrogen fluoride formed during the fluorination and to prevent charring or combustion of the ether during the fluorination.
Claim 3
Dependent Claim
12 words
A method of claim 1, wherein the hydrocarbon ether is a polyether.
Claim 4
Dependent Claim
12 words
A method of claim 2, wherein the polyether is a linear polyether.
Claim 5
Dependent Claim
13 words
A method of claim 1, wherein the hydrogen fluoride scavenger is sodium fluoride.
Claim 6
Dependent Claim
14 words
A method of claim 1, wherein pure fluorine gas is used for the fluorination.
Claim 7
Dependent Claim
15 words
A method of claim 1, wherein the ether is coated onto the hydrogen fluoride scavenger.
Claim 8
Dependent Claim
25 words
A method of claim 1, wherein the hydrogen fluoride scavenger and the ether are present in a weight ratio of about 1:1 to about 20:1.
Claim 9
Dependent Claim
16 words
A method of claim 1, wherein the hydrogen fluoride scavenger is in powder or pellet form.
Claim 10
Dependent Claim
25 words
A method of claim 1, wherein the reactor is a stationary metal tube, a rotating drum reactor, a fluidized bed reactor or a solvent reactor.
Claim 11
Independent Claim
51 words
A method of perfluorinating a polyether, comprising: a. placing the polyether and hydrogen fluoride scavenger in a fluorine reactor, the amount of hydrogen fluoride scavenger being sufficient to react with hydrogen fluoride formed during fluorination; and b. fluorinating the polyether by introducing fluorine into the reactor under conditions sufficient for perfluorination.
Claim 12
Independent Claim
51 words
A method of perfluorinating a polyether, comprising: a. placing the polyether and hydrogen fluoride scavenger in a fluorine reactor, the amount of hydrogen fluoride scavenger being sufficient to react with hydrogen fluoride formed during fluorination; and b. fluorinating the polyether by introducing fluorine into the reactor under conditions sufficient for perfluorination.
Claim 13
Dependent Claim
12 words
A method of claim 10, wherein the polyether is a linear polyether.
Claim 14
Dependent Claim
13 words
A method of claim 10, wherein the hydrogen fluoride scavenger is sodium fluoride.
Claim 15
Dependent Claim
16 words
A method of claim 10, wherein the polyether and the hydrogen fluoride scavenger are mixed together.
Claim 16
Dependent Claim
15 words
A method of claim 10, wherein the ether is coated onto the hydrogen fluoride scavenger.
Claim 17
Dependent Claim
25 words
A method of claim 10, wherein the hydrogen fluoride scavenger and the ether are present in a weight ratio of about 1:1 to about 20:1.
Claim 18
Dependent Claim
16 words
A method of claim 10, wherein the hydrogen fluoride scavenger is in powder or pellet form.
Claim 19
Dependent Claim
25 words
A method of claim 10, wherein the reactor is a stationary metal tube, a rotating drum reactor, a fluidized bed reactor or a solvent reactor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |