US4900874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing fluorine-containing olefin
Assignee: Daikin Industries Ltd
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Filing: 1989-02-13
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Granted: 1990-02-13
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Expires: 2009-02-13
Abstract
Abstract A method for producing a fluorine-containing olefin represented by formula (I): Ch.sub.2 ═CFR.sub.f (I) wherein R f represents a perfluoroalkyl group or a fluoroalkyl group comprising the step of contacting, at a high temperature, hydrogen gas with a 1,1-dihydro-2,2-difluoro alcohol represented by formula (II): HOCH.sub.2 CF.sub.2 R.sub.f (II) wherein R f represents a perfluoroalkyl group or a fluoroalkyl group.
Inventors
- 👤 Kiyohiko Ihara
- 👤 Fumihiko Yamaguchi
- 👤 Shinichi Yamane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:22
CPC Classifications
C; C07; C07C; C07C17/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
A method for producing a fluorine-containing olefin represented by formula (I): CH.sub.2 ═CFR.sub.f (I) wherein R f represents a perfluoroalkyl group or a fluoroalkyl group comprising the step of contacting, at a high temperature, hydrogen gas with a 1,1-dihydro-2,2-difluoro alcohol represented by formula (II): HOCH.sub.2 CF.sub.2 R.sub.f (II) wherein R f represents a perfluoroalkyl group or a fluoroalkyl group.
Claim 2
Independent Claim
59 words
A method for producing a fluorine-containing olefin represented by formula (I): CH.sub.2 ═CFR.sub.f (I) wherein R f represents a perfluoroalkyl group or a fluoroalkyl group comprising the step of contacting, at a high temperature, hydrogen gas with a 1,1-dihydro-2,2-difluoro alcohol represented by formula (II): HOCH.sub.2 CF.sub.2 R.sub.f (II) wherein R f represents a perfluoroalkyl group or a fluoroalkyl group.
Claim 3
Dependent Claim
51 words
A method as claimed in claim 1, comprising the step of passing a mixed gas comprising said 1,1-dihydro-2,2-difluoro alcohol and hydrogen gas in which the molar ratio of hydrogen gas to said 1,1-dihydro-2,2-difluoro alcohol is 1 or more through a reacting tube at a temperature of from 350° to 700° C.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 2, wherein the molar ratio of hydrogen gas to said 1,1-dihydro-2,2-difluoro alcohol is from 2 to 7.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 3, wherein the molar ratio of hydrogen gas to said 1,1-dihydro-2,2-difluoro alcohol is from 3 to 5.
Claim 6
Dependent Claim
17 words
A method as claimed in claim 2, wherein said reaction temperature is from 400° to 650° C.
Claim 7
Dependent Claim
21 words
A method as claimed in claim 2, wherein the pressure of said reaction is from 0.5 to 5 kg/cm 2 .
Claim 8
Dependent Claim
21 words
A method as claimed in claim 6, wherein the pressure of said reaction is from 0.5 to 1.5 kg/cm 2 .
Claim 9
Dependent Claim
20 words
A method as claimed in claim 2, wherein the contacting time of said reaction is from 0.1 to 120 seconds.
Claim 10
Dependent Claim
20 words
A method as claimed in claim 8, wherein the contacting time of said reaction is from 1 to 10 seconds.
References Cited (Backward Citations)
US3038947A
Cited
US3322840A
Cited
US3419628A
Cited
US3456024A
Cited
US3843735A
Cited
GB2141426A
Cited
EP0167097A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |