Manufacture of hydrofluoroalkanesulfonic acids

Details Manufacture of hydrofluoroalkanesulfonic acids Manufacture of hydrofluoroalkanesulfonic acids

2011-03-01

2011-03-01

O'Sullivan, Peter G (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfonic acids or salts thereof

C562S111000, C562S116000, C562S123000

Reexamination Certificate

active

07897807

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.

REFERENCES:
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patent: 1097191 (1995-01-01), None
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patent: 2006084262 (2006-08-01), None
Kilian, A. and Waeschke, H.; “Synthesis of 1,1,2,2-Tetrafluoroethane Sulfonic Acid (TFESA) in the Autoclave”, Wissenschaftliche Beitrage, Ingenieurhochschule Kothen, pp. 22-28 (1978).
Koshar, R. J. et al; “Preparation of Beta-H-Perfluoro Alkanesulphonic Acids”, Journal of the American Chemical Society, vol. 75, No. 18, Sep. 20, 1953, pp. 4595-4596, American Chemical Society, Washington, DC.

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