US4147733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorination of chlorinated hydrocarbons
Assignee: Dow Chemical Co
•
Filing: 1978-05-22
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Granted: 1979-04-03
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Expires: 1998-05-22
Abstract
Abstract Chlorine atoms in chlorinated lower aliphatic hydrocarbons are replaced by fluorine in the vapor phase reaction of the chlorinated hydrocarbons with aqueous HF at 275° C.- 425° C. in the presence of a metal fluoride catalyst, particularly where the metal is one or more of aluminum, nickel, or chromium. The fluorinated products are blowing agents, refrigerants, monomers, or intermediates for making them.
Inventors
- 👤 Tom R. Fiske
- 👤 Daniel W. Baugh, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:28
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
A process for making a fluorinated lower aliphatic hydrocarbon which comprises contacting a corresponding lower aliphatic chlorinated hydrocarbon in the vapor phase with HF in the presence of steam at about 275° C.-425° C. in the presence of a metal fluoride catalyst.
Claim 2
Dependent Claim
42 words
A process for making a fluorinated lower aliphatic hydrocarbon which comprises contacting a corresponding lower aliphatic chlorinated hydrocarbon in the vapor phase with HF in the presence of steam at about 275° C.-425° C. in the presence of a metal fluoride catalyst.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the metal fluoride is an aluminum fluoride, a chromium fluoride, a nickel fluoride, or a mixture thereof.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein the HF and steam together are equivalent to vaporized aqueous HF of about 20-75 percent HF concentration.
Claim 5
Dependent Claim
24 words
The process of claim 3 wherein the HF is in molar excess over the chlorine to be replaced by fluorine in the chlorinated hydrocarbon.
Claim 6
Dependent Claim
20 words
The process of claim 3 wherein the HF and steam together constitute aqueous hydrofluoric acid of about 35-40 percent concentration.
Claim 7
Dependent Claim
19 words
The process of claim 3 wherein the chlorinated hydrocarbon is vinyl chloride and the fluorinated product comprises vinyl fluoride.
Claim 8
Dependent Claim
24 words
The process of claim 3 wherein the chlorinated hydrocarbon is ethylene dichloride and the fluorinated product comprises ethylene chlorofluoride, ethylidene difluoride, and vinyl fluoride.
Claim 9
Dependent Claim
23 words
The process of claim 3 wherein the chlorinated hydrocarbon is vinylidene chloride and the fluorinated product comprises vinylidene fluoride, vinylidene chlorofluoride, and 1,1,1-trifluoroethane.
Claim 10
Dependent Claim
22 words
The process of claim 3 wherein the chlorinated hydrocarbon is methylene chloride and the fluorinated product comprises methylene chlorofluoride and methylene fluoride.
References Cited (Backward Citations)
US2744148A
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US3258500A
Cited
GB1006456A
Cited
FR1369786A
Cited
GB975498A
Cited
US3862995A
Cited
US4052468A
Cited
US4039596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |