{HEAD ~ Process} for {TAIL ~ the recovery} of fluorinated sulphonic acid including the step of subjecting the spent acid to heat treatment with stepwise or continuously increasing temperature, withdrawing at least two fractions during the heat treatment; and recovering the fluorinated sulphonic acid from each fraction 
for
{ HEAD ~ Process } for { TAIL ~ the recovery } of fluorinated sulphonic acid including the step of subjecting the spent acid to heat treatment with stepwise or continuously increasing temperature , withdrawing at least two fractions during the heat treatment ; and recovering the fluorinated sulphonic acid from each fraction
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