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:
Jun. 25, 2024
Filed:
Nov. 09, 2022
Applicant:
Röhm Gmbh, Darmstadt, DE;
Inventor:
Steffen Krill, Muehltal, DE;
Assignee:
RÖHM GMBH, Darmstadt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 67/44 (2006.01); C07C 67/54 (2006.01); C07C 69/54 (2006.01);
U.S. Cl.
CPC ...
C07C 67/44 (2013.01); C07C 67/54 (2013.01); C07C 69/54 (2013.01);
Abstract
A process can be used for preparing methyl methacrylate (MMA), by direct oxidative esterification of methacrolein. The MMA and polymers produced therefrom feature a very low yellowness index. A workup of the reactor output from the oxidative esterification of methacrolein allows for particularly discolouring by-products to be removed or degraded without significant MMA losses.