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. 02, 2015
Filed:
Mar. 15, 2013
Sumitomo Chemical Company, Limited, Chuo-ku, Tokyo, JP;
Noriaki Suyasu, Niihama, JP;
Eiichi Shiraishi, Niihama, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Abstract
An object of the present invention is to provide a process for producing methacrylic acid with good productivity over a long period of time. The present invention provides a process for producing methacrylic acid by oxidizing methacrolein with oxygen in a continuous manner, comprising supplying a mixed gas containing methacrolein, isobutylene and oxygen and having a content of isobutylene of 300 to 3000 volume ppm, initiating the oxidation so that the methacrolein conversion at an outlet of a reactor becomes at least 85% and, thereafter, continuing the oxidation while the mixed gas having a content of isobutylene of 300 to 3000 volume ppm is supplied until a difference (X1−X2) between methacrolein conversion (X2) at the outlet of the reactor and methacrolein conversion (X1) at the outlet of the reactor at the time of the initiation of oxidation comes into the range of 2 to 30%, and continuing the oxidation while the mixed gas having a content of isobutylene of 500 volume ppm or less is supplied, after the difference (X1−X2) comes into the range of 2 to 30%.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile