Process for synthesis of Di(meth)acrylic acid esters
AssigneeRoehm GmbH
InventorsJoachim Knebel, Joachim Carl, Guenter Graeff, Andrea Wittkowski
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Abstract
A process for the synthesis and recovery of di(meth)acrylic acid esters at a high degree of purity. Di(meth)acrylic acid esters are produced by transesterfication of (meth)acrylic acid esters of C1 to C4 alcohols with 1,n-diols (where n≧3) in the presence of a zirconium catalyst that comprises a chelate of zirconium with a 1,3-dicarbonyl compound. These catalysts can be readily separated or removed from the reaction mixture by precipitation with phosphoric acid, thus providing a convenient and inexpensive method of producing a di(meth)acrylic acid ester with a reduced level of zirconium.
Claims20
A process for the synthesis of di(meth)acrylic acid esters comprising:
- transesterification of
- a (meth)acrylic acid ester of a C1 to C4 alcohol with
- an 1,n-diol, where n≧3,
- in the presence of a zirconium catalyst comprising a chelate of zirconium with a 1,3-dicarbonyl compound;
- and
- separating said zirconium catalyst from transesterified di(meth)acrylic acid esters by precipitation with phosphoric acid.
Dependencies are inferred from the claim text.