Patent ID: 11952336
Assignee: EVONIK OPERATIONS GMBH
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 5:
6. A process for preparing a (meth)acrylate of formula (II)

CH2═C(R2)—CO—OR1  (II),

in which
R2 is hydrogen or methyl, and
R1 is a linear or branched, acyclic or cyclic alkyl, aryl or alkenyl radical having 6 to 22 carbon atoms,
the process comprising:
reacting a methyl (meth)acrylate of forma (III)

CH2═C(R2)—CO—OMe  (III),

in which R2 is defined as above,
with an alcohol of formula (I)

HO—R1  (I),

in which R1 is defined as above;
wherein the methanol produced by the transesterification reaction is separated with the methyl (meth)acrylate of formula (III) at a methanol concentration less than or equal to an azeotropic composition of methanol and methyl (meth)acrylate of formula (III) using a distillation column; and
a thus-obtained mixture is enriched to a methanol concentration greater than the concentration of methanol in the azeotropic composition of methanol and methyl (meth)acrylate of formula (III), by adding further alcohol of formula (I) via an alcohol feed located at the distillation column.