| 摘要 |
The present invention relates to a process for the synthesis of (meth)acrylic anhydride, according to which (meth)acrylic acid is reacted with acetic anhydride in the presence of at least one polymerization inhibitor, in a reactor surmounted by a distillation column. This process is characterized in that the mole ratio of (meth)acrylic acid to acetic anhydride is chosen to be between 2 and 5, in that the reaction is performed in the absence of catalyst, and in that: the acetic acid formed during the reaction is drawn off, and at least one polymerization inhibitor is gradually introduced into the top of the distillation column during the reaction and the distillation enabling the (meth)acrylic anhydride formed to be separated. The (meth)acrylic anhydrides thereby obtained are used, in particular, as reagents in the preparation of (meth)acrylates.
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