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. 16, 2021
Filed:
Mar. 23, 2018
Applicant:
Mitsubishi Chemical Uk Limited, Billingham, GB;
Inventor:
Neil Tindale, Redcar, GB;
Assignee:
MITSUBISHI CHEMICAL UK LIMITED, Billingham, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 67/20 (2006.01); C07C 51/06 (2006.01); C07C 57/04 (2006.01); C07C 69/54 (2006.01);
U.S. Cl.
CPC ...
C07C 67/20 (2013.01); C07C 51/06 (2013.01); C07C 57/04 (2013.01); C07C 69/54 (2013.01);
Abstract
There is described a method of reducing polymer tar build-up in the production of methyl methacrylate and/or methacrylic acid by the acetone cyanohydrin process. In the method a stabiliser is contacted with the amide stage reaction medium. The stabiliser includes a hydrocarbon moiety capable of donating a labile hydrogen atom to a methacrylamide derivative capable of reaction with said labile hydrogen atom under the conditions in the said medium. The method herein is especially useful for the continuous production of methyl methacrylate and/or methacrylic acid.