Patent ID: 8889899
Filing Date: 2014-11-18
Classification: B01D,C07C

Abstract:
1. A process for transesterification comprising: A) mixing methacrylic acid with at least one ester; and B) transferring an alcohol radical of the at least one ester to the methacrylic acid to obtain an ester of methacrylic acid and an acid of the at least one ester; wherein: B) is carried out in an apparatus comprising at least one distillation column and at least one reactor; the at least one ester comprises an alkyl α-hydroxycarboxylate; the reaction mixture comprises at least one polymerization inhibitor selected from the group consisting of phenothiazine, tert-butylcatechol, hydroquinone monomethyl ether, hydroquinone, and 4-hydroxy-2,2,6,6-tetramethylpiperidinooxyl; and the apparatus further comprises at least one line between at least one distillation column and at least one reactor equipped with a means for increasing pressure.