Method for esterifying (meth)acrylic acid with an alkanol
AssigneeBASF SE
InventorsHeinrich Aichinger, Holger Herbst, Gerhard Nestler, Jürgen Schröder, Stefan Beckmann
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Abstract
In a process for esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst, in which unconverted starting compounds and (meth)acrylic ester to be formed are separated off by distillation and an oxyester-containing bottom product is formed, the bottom product is first separated off and then the oxyesters contained in it are cleaved in the presence of a relatively long-chain alkylbenzenesulfonic acid at elevated temperatures.
Claims24
A process for esterifying (meth)acrylic acid with an alkanol in the presence of an esterification catalyst, in which unconverted starting compounds and (meth)acrylic ester formed are removed from the reaction mixture by distillation, leaving behind an oxyester-containing bottom product, the bottom product is separated off and the oxyesters contained therein are thereafter cleaved by the action of elevated temperature in the presence of at least one acid catalyst, at least one aromatic sulfonic acid of the formula IV,
- where
- R″ independently of one another are each alkyl of six to twenty carbon atoms,
- u is an integer from 1 to 3, and
- v is 1 or 2,
- being present as the at least one acid catalyst for cleaving the oxyesters, wherein the cleavage is carried out stepwise.
Dependencies are inferred from the claim text.