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. 07, 1978
Filed:
Mar. 08, 1977
Asahi Glass Company, Ltd., Tokyo, JP;
Abstract
In a process for producing methacrylic acid by two step oxidation comprising a first oxidation step of producing methacrolein by reacting isobutylene with molecular oxygen in the presence of a diluent gas and a catalyst, and a second oxidation step of producing methacrylic acid by reacting methacrolein with molecular oxygen in the presence of a diluent gas and a catalyst, the improvement comprises using nitrogen as the diluent gas in the first oxidation step and nitrogen and steam as the diluent gas in the second oxidation step, mixing the reaction products obtained in the first and second oxidation steps, separating and recovering methacrolein and methacrylic acid from the mixture and feeding the recovered methacrolein back into the second oxidation step as a starting material.