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25 g (0.074 mol) of potassium perfluorobutanesulphonate are suspended in 63 ml of methanol. The suspension is heated to a temperature of 50° C. and at the same time hydrochloric acid gas is bubbled through for approx. 1 hour. At the end of the addition the suspension is cooled to a temperature of 0°±5° C. and the potassium chloride filtered. The solution is concentrated under vacuum so as to eliminate the solvent. 26.5 g of a yellowish residue is obtained with a titre of 79.63% equal to 21.1 g of perfluorobutanesulphonic acid (Expected theoretical yield 22.21 g).

1. customis bubbled through for approx. 1 hour
2. additionAt the end of the addition the suspension
3. temperatureis cooled to a temperature of 0°±5° C.
4. filtrationthe potassium chloride filtered
5. concentrationThe solution is concentrated under vacuum so as