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:
Jan. 20, 1981
Filed:
Dec. 06, 1978
Applicant:
Inventors:
Naoki Andoh, Yokkaichi, JP;
Ituo Nishiwaki, Yokkaichi, JP;
Akira Iio, Yokkaichi, JP;
Masatoshi Arakawa, Yokkaichi, JP;
Assignee:
Japan Synthetic Rubber Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
562535 ; 252435 ; 252437 ; 562536 ;
Abstract
Methacrylic acid is produced from methacrolein by gaseous phase oxidation in a very high selectivity, when methacrolein, molecular oxygen-containing gas and steam in a molar ratio of methacrolein:molecular oxygen:steam of 1:1-3:0-50 are subjected to reaction at a temperature in the range of 250.degree. to 400.degree. C., at a space velocity of 250 to 3,000 hr.sup.-1 (at 0.degree. C. and 1 atm.) with a novel catalyst having the following composition formula in atomic ratio: