Process for preparing acid anhydrides

C - Chemistry – Metallurgy – 07 – D

Patent

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260/359.3, 260/3

C07D 307/60 (2006.01) C07C 51/56 (2006.01) C07D 307/89 (2006.01) C07D 309/36 (2006.01)

Patent

CA 1337701

La présente invention concerne un procédé de pré- paration d'anhydrides d'acide, caractérisé en ce que l'on met en présence un acide devant subir l'anhydridation avec une argile ayant subi un ou plusieurs traitements par un ou plusieurs acides. L'invention concerne de préférence un procédé qui consiste à préparer sélectivement l'anhydride itaconique à partir de l'acide itaconique. Ce procédé permet d'éviter les inconvénients des procédés de l'art antérieur.

583494

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