Patent ID: 6248923
Filing Date: 2001-06-19
Classification: C07C,Y02P

Abstract:
Process for the coproduction of a symmetrical fluorocarboxylic acid anhydride and acetic anhydride which comprises contacting ketene and a fluorocarboxylic acid containing 2 to 4 carbon atoms to produce an acetyl mixed anhydride and subjecting the acetyl mixed anhydride to reactive distillation to produce a lower boiling product comprising the symmetrical fluorocarboxylic acid anhydride and a higher boiling product comprising acetic anhydride (Ac.sub.2 O), provided that (i) the boiling point of the symmetrical anhydride of the fluorocarboxylic acid is lower than the boiling point of the fluorocarboxylic acid and (ii) the boiling point of the symmetrical anhydride of the fluorocarboxylic acid is lower than the boiling point of acetic anhydride.