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:
Sep. 04, 1984
Filed:
Oct. 26, 1982
Applicant:
Inventors:
Rudolf Brockhaus, Marl, DE;
Hans-Jurgen Franke, Dorsten, DE;
Assignee:
Chemische Werke Huels, AG, Marl, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07C / ; C07D / ;
U.S. Cl.
CPC ...
562599 ; 549532 ; 562531 ; 568483 ; 568594 ; 568691 ;
Abstract
To produce methacrylic acid, firstly, isobutyraldehyde is acetalized. The resultant acetal is cleaved into the isobutenyl ether and alcohol. The isobutenyl ether is oxidized with molecular oxygen or an oxygen-containing gaseous mixture in the presence of an alkaline solution at temperatures of 30.degree.-70.degree. C. to obtain the epoxide. This epoxide is hydrolyzed to the .alpha.-hydroxyisobutyraldehyde. The latter is then oxidized with concentrated or fuming nitric acid at temperatures of 20.degree.-110.degree. C. to produce .alpha.-hydroxyisobutyric acid, and methacrylic acid is obtained therefrom by splitting off water.