Manufacture of esters

Details Manufacture of esters Manufacture of esters

2011-08-16

2011-08-16

Puttlitz, Karl J (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C560S217000, C560S174000

Reexamination Certificate

active

07999131

ABSTRACT:
The invention relates to a process in which a compound R1COOR3(I) is made by a transesterification reaction of an ester compound R1COOR2(II) with an alcohol R3OH (III) in the presence of a transesterification catalyst, wherein R1is H or C1-4alkyl or CH2═CR4—; R2is C1-4alkyl; R3is selected from the group consisting of alkyl having at least 4 carbon atoms, cycloalkyl having at least 5 carbon atoms, aryl, aralkyl, alkaryl and amino alkyl; and R4is —H or —C1-4alkyl, wherein alcohol R2OH (IV) is formed as a byproduct and in which said byproduct (IV) is removed by distillation in the presence of an entrainer, in which the entrainer is a compound that suppresses the formation of an azeotrope between compound (II) and byproduct (IV). The process can be useful in the preparation of esters such as dimethyl amino ethyl(meth)acrylate. The invention also provides a method of separating alcohols and esters. In a further form of the invention a process of preparing esters by a transesterification process is provided in which the transesterification catalyst is homogenous.

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