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US 4,736,045 AGranted
Process for fluorinating ethers
OwnerFrederick G. Drakesmith, Richard L. Powell +2inventors
InventorsFrederick G. Drakesmith, Richard L. Powell, Richard D. Chambers, Brian Grievson
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Abstract
Fluorinated ether, process for their preparation, and use of the fluorinated ethers as inert fluids.
Claims18
A process for the preparation of a fully fluorinated ether, wherein the process comprises
- forming an adduct comprising a free-radical addition of a fluoro-olefin and a hydrogen-containing ether;
- and
- fluorinating the adduct using cobalt trifluoride as a fluorinating agent at a temperature of 300.degree. to 600.degree. C. and substantially avoiding fragmentation of said adduct and thereby controlling the yield of the desired fluorinated ether.
A process for the preparation of a fully fluorinated ether, wherein the process comprises
- forming an adduct comprising free-radical addition of a fluoro-olefin and a hydrogen-containing ether, wherein the mole ratio of fluoro-olefin to hydrogen-containing ether in the adduct is from 6:1 to 1:1;
- fluorinating the adduct using a fluorinating agent comprising cobalt trifluoride at a temperature of 300.degree. to 600.degree. C.;
- wherein the fluoro-olefin is selected from the group consisting of difluoroethylene, trifluoroethylene, tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropene and perfluorocyclobutene;
- and
- wherein the hydrogen-containing ether is selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, tetrahydrofuran, dioxane, tetrahydropyran, trimethylene oxide and ethylene glycol dimethyl ether, and substantially avoiding fragmentation of said adduct and thereby controlling the yield of the desired fluorinated ether.
2 more elements
Dependencies are inferred from the claim text.