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:
May. 08, 2018
Filed:
Dec. 11, 2014
Steffen Krill, Muehltal, DE;
Alexander Lygin, Griesheim, DE;
Matthias Groemping, Darmstadt, DE;
Torsten Balduf, Pfungstadt, DE;
Rudolf Burghardt, Darmstadt, DE;
Steffen Krill, Muehltal, DE;
Alexander Lygin, Griesheim, DE;
Matthias Groemping, Darmstadt, DE;
Torsten Balduf, Pfungstadt, DE;
Rudolf Burghardt, Darmstadt, DE;
Evonik Roehm GmbH, Darmstadt, DE;
Abstract
The present invention relates to a catalytic continuous process for producing methyl methacrylate, said process comprising the step of reacting methacrolein with oxygen and methanol in the presence of a heterogeneous noble-metal-containing catalyst in an oxidative esterification reaction to give methyl methacrylate, characterized in that the stationary concentration of the starting material methacrolein is equal to or less than 12% by weight based on the total weight of the reaction mixture in the reactor, and the ratio F between the total liquid volume within the reactor expressed in liters divided by the total weight of catalyst in the reactor expressed in kilograms is equal to or less than 4.