Method for refining acetic anhydride

Details Method for refining acetic anhydride Method for refining acetic anhydride

C - Chemistry, Metallurgy

07

C

C07C 53/12 (2006.01) C07C 51/573 (2006.01)

Patent

CA 2145748

Disclosed is a continuous method for refining acetic anhydride produced by the reaction of ketene and acetic acid by means of a vacuum distillation system to provide a refined material comprised of at least 99.5 weight percent acetic anhydride, not more than 0.5 weight percent acetic acid and not more than 90 parts per million (ppm) diketene.

Méthode en continu pour le raffinage de l'acide acétique produit par réaction d'un cétène avec de l'acide acétique au moyen d'un système de distillation sous vide; on obtient ainsi un produit raffiné contenant au moins 99,5 % en poids d'anhydride acétique, au plus 0,5 % en poids d'acide acétique, et au plus 90 parties par million (ppm) de dicétène.

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