US4221734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of derivatives of fluoroalkane-carboxylic and perfluoroalkane-sulfinic acids
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1977-12-12
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Granted: 1980-09-09
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Expires: 1997-12-12
Abstract
Abstract A process is disclosed for the preparation of derivatives of perfluoroalkanecarboxylic acids and perfluoroalkanesulphinic acids by reacting a perfluoroalkylhalide having the general formula RFX, in which X represents an atom of chlorine, bromine, or iodine, and RF represents an unbranched or branched perfluorinated chain containing from 2 to 12 carbon atoms; with CO2 or SO2 in a solvent medium and in the presence of activated or unactivated zinc.
Inventors
- 👤 Auguste Commeyras
- 👤 Hubert Blancou
- 👤 Andre Lantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:51
CPC Classifications
C; C07; C07C; C07C313/00; C07C313/02; C07C313/04; C07C309/00; C07C51/00; C07C51/15
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A process for the preparation of zinc salts of perfluoroalkanecarboxylic acid and perfluoroalkanesulphinic acid which comprises reacting a perfluoroalkyl halide having the general formula R F X, wherein X represents an atom of chlorine, bromine, or iodine, and wherein R F represents an unbranched or branched perfluorinated chain containing from 2 to 12 carbon atoms; with CO 2 or SO 2 in an inert solvent medium and in the presence of a material consisting essentially of unactivated zinc the mole ratio of zinc to perfluoroalkyl halide being from 1:1 to 2:1.
Claim 2
Dependent Claim
91 words
A process for the preparation of zinc salts of perfluoroalkanecarboxylic acid and perfluoroalkanesulphinic acid which comprises reacting a perfluoroalkyl halide having the general formula R F X, wherein X represents an atom of chlorine, bromine, or iodine, and wherein R F represents an unbranched or branched perfluorinated chain containing from 2 to 12 carbon atoms; with CO 2 or SO 2 in an inert solvent medium and in the presence of a material consisting essentially of unactivated zinc the mole ratio of zinc to perfluoroalkyl halide being from 1:1 to 2:1.
Claim 3
Dependent Claim
15 words
The process according to claim 1, in which the perfluoroalkyl halide is a perfluoroalkyl iodide.
Claim 4
Dependent Claim
14 words
The process according to claim 1 in which the reactant is gaseous carbon dioxide.
Claim 5
Dependent Claim
13 words
The process according to claim 1 in which the reactant is sulphurous anhydride.
Claim 6
Dependent Claim
34 words
The process of claim 1 wherein the reaction temperature is between 30° and 100° C., and the amount of inert solvent is between 100 and 500 ml. of solvent per mole of perfluoroalkyl halide.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the mole ratio of zinc to perfluoroalkyl halide is 1.2:1 to 1.5:1, and wherein the zinc is in powder form.
Claim 8
Dependent Claim
25 words
The process of claim 3 wherein zinc perfluorocarboxylate is recovered and reacted with acetic acid whereby perfluorocarboxylic acid is produced and recovered as the product.
Claim 9
Dependent Claim
23 words
The process of claim 4 wherein zinc perfluorosulphinate is recovered and reacted with hydrochloric acid whereby perfluoroalkylsulphonyl chloride is recovered as the product.
Claim 10
Dependent Claim
25 words
The process of claim 1 wherein the amount of CO 2 or SO 2 is from about 5 to 20% excess relative the perfluoroalkyl halide.
References Cited (Backward Citations)
US4098806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |