The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2012
Filed:
Apr. 22, 2011
John Colin Dunn, Holmfirth, GB;
Dinesh Mistry, Bradford, GB;
Martin Gower, Halifax, GB;
Roger Prétôt, Basel, CH;
Markus Schmid, Münchenstein, CH;
John Colin Dunn, Holmfirth, GB;
Dinesh Mistry, Bradford, GB;
Martin Gower, Halifax, GB;
Roger Prétôt, Basel, CH;
Markus Schmid, Münchenstein, CH;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to a process in which a compound RCOOR(I) is made by a transesterification reaction of an ester compound RCOOR(II) with an alcohol ROH (III) in the presence of a transesterification catalyst, wherein Ris H or Calkyl or CH═CR—; Ris Calkyl; Ris 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 Ris —H or —Calkyl, wherein alcohol ROH (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.