Manufacture of Hydrofluoroalkanesulfonic Acids
AssigneeE. I. Du Pont de Nemours and Company
InventorsMark Andrew Harmer, Christopher P. Junk, Zoe Schnepp
Life of this patent
Estimating the term…
Abstract
A process for manufacture of hydrofluoroalkanesulfonic acid with at least one hydrogen bonded to the carbon atom adjacent to the carbon atom bonded to the sulfonic acid group comprising: contacting a fluoroolefin with sulfite in an aqueous solution adjusted to about pH 4 to pH 12; removing water from the solution to form a solid; directly treating the solid with oleum; and distilling the hydrofluoroalkanesulfonic acid therefrom. Also a process for manufacture of potassium hydrofluoroalkanesulfonate in high purity is described.
Claims4
Process for manufacture of potassium hydrofluoroalkanesulfonate with at least one hydrogen bonded to a carbon atom adjacent to the carbon atom bonded to the sulfonate group comprising:
- a) contacting fluoroolefin having at least three carbon atoms with an aqueous solution of sulfite and counter ion in which the counter ion comprises potassium, said solution having a pH of about 4 to 12;
- b) employing conditions which cause potassium hydrofluoroalkanesulfonate to precipitate from said solution.
The potassium salts of Rf—CFH—CF2SO3−, wherein Rf is selected from the group consisting of fluoroalkyl groups, perfluoroalkyl groups, cyclofluoroalkyl groups and cycloperfluoroalkyl groups, said groups optionally containing ether oxygen.
Potassium 1,1,2,3,3,3-hexafluoropropanesulfonate.
Dependencies are inferred from the claim text.