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. 28, 1978
Filed:
Feb. 16, 1977
Erna A Bljumberg, Moscow, SU;
Gennady F Vytnov, Dzerzhinsk Gorkovskoi oblasti, SU;
Oleg V Isaev, Moscow, SU;
Oleg V Krylov, Moscow, SU;
Sergei A Maslov, Moscow, SU;
Lia Y Margolis, Moscow, SU;
Alexandr P Sineokov, Dzerzhinsk Gorkovskoi oblasti, SU;
Evgeny S Smirnov, Dzerzhinsk Gorkovskoi oblasti, SU;
Levon A Tavadian, Erevan, SU;
Nikolai M Emanuel, Moscow, SU;
Kapitalina I Grobova, Gorky, SU;
Valentina V Krylova, Dzerzhinsk Gorkovskoi oblasti, SU;
Other;
Abstract
A method of preparing methacrylic acid, which comprises liquid-phase oxidation of alpha-methylacrolein with an oxygen-containing gas in a medium of an organic solvent at a temperature ranging from 50.degree. to 100.degree. C and under a pressure of from 1 to 50 atm in the presence of a heterogeneous catalyst such as borides, carbides or nitrides of elements pertaining to Groups IVB-VB of the periodic system, or aluminum boride, carbide or nitride and in the presence of a polymerization inhibitor, whereafter the desired product is separated from the resulting reaction mixture. The method according to the present invention makes it possible to produce methacrylic acid with a high selectivity (up to 86% as calculated for the reacted alpha-methylacrolein). Conversion degree of the starting aldehyde is as high as 55%. There is no formation of polymeric products during the oxidation process.