Patent ID: 6469206
Filing Date: 2002-10-22
Classification: C07C,Y02P

Abstract:
Process for the coproduction of trifluoromethanesulfonic acid anhydride and a carboxylic acid anhydride which comprises the steps of:(1) forming a mixed anhydride comprising a trifluoromethanesulfonyl acyl residue and a carboxyl residue by contacting trifluoromethanesulfonic acid (triflic acid) or an acid halide thereof with a carboxyl compound selected from ketene, dialkyl ketenes, carboxylic acids, salts of carboxylic acids, and carboxylic acid halides; and (2) subjecting the mixed anhydride to reactive distillation to produce triflic anhydride and a higher boiling carboxylic acid anhydride.