Manufacture of hydrofluoroalkanesulfonic acids
AssigneeE.I. du Pont de Nemours and Company
InventorsMark Andrew Harmer, Christopher P. Junk, Zoe Schnepp
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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.
Claims14
Process for manufacture of hydrofluoroalkanesulfonic acid with at least one hydrogen bonded to a carbon atom adjacent to the carbon atom bonded to the sulfonic acid group comprising:
- a) contacting fluoroolefin with sulfite in an aqueous solution adjusted to about pH 4 to pH 12;
- b) removing water from said solution to form a solid;
- c) directly treating said solid with oleum to form a mixture that includes hydrofluoroalkanesulfonic acid;
- and
- d) distilling said hydrofluoroalkanesulfonic acid from said mixture.
Dependencies are inferred from the claim text.