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:
Oct. 29, 2013
Filed:
Mar. 28, 2007
Alexander May, Darmstadt, DE;
Bernd Vogel, Wiesbaden, DE;
Hermann Siegert, Seeheim-Jugenheim, DE;
Jochen Ackermann, Muehltal, DE;
Soenke Broecker, Ober-Ramstadt, DE;
Alexander May, Darmstadt, DE;
Bernd Vogel, Wiesbaden, DE;
Hermann Siegert, Seeheim-Jugenheim, DE;
Jochen Ackermann, Muehltal, DE;
Soenke Broecker, Ober-Ramstadt, DE;
Evonik Roehm GmbH, Darmstadt, DE;
Abstract
Alpha-hydroxycarboxylic esters are prepared by a continuous process in which alpha-hydroxycarboxamide is reacted with an alcohol in the presence of a catalyst to obtain a product mixture which contains alpha-hydroxycarboxylic ester, ammonia, unconverted alpha-hydroxycarboxamide and alcohol, and catalyst; wherein reactant streams containing an alpha-hydroxycarboxamide, an alcohol and a catalyst are fed into a pressure reactor. The reactant streams are reacted with one another in the pressure reactor at a pressure in the range of 1 bar to 100 bar; and the product mixture is depleted in alcohol and ammonia by distilling off ammonia at a pressure which is constantly kept greater than 1 bar without the aid of additional stripping media. The continuous process can be employed particularly advantageously on the industrial scale.