Method for producing methacrylic acid

Details Method for producing methacrylic acid Method for producing methacrylic acid

C - Chemistry, Metallurgy

07

C

260/520.7

C07C 57/04 (2006.01) C07C 41/28 (2006.01) C07C 41/56 (2006.01) C07C 45/51 (2006.01) C07C 45/58 (2006.01) C07C 51/27 (2006.01) C07D 303/48 (2006.01)

Patent

CA 1183866

ABSTRACT OF THE DISCLOSURE In producing methacrylic acid, a first step is preferably to acetalate isobutyraldehyde, the acetal thus formed being then broken down into isobutenyl-ether and alcohol, and thereafter the isobutenyl-ether is oxidized with molecular oxygen, or a mixture of gases containing oxygen, in the presence of a leach at temperatures of 30 to 70°C, into an epoxide, said epoxide being hydrolyzed into .alpha.-hydroxyisobutyraldehyde which is then oxidized, with concentrated or fuming nitric-acid at temperatures of 20 to 110°C, into .alpha.-hydroxyisobutyric acid from which methacrylic acid is obtained by dehydration. This preferred production route utilizes readily accessible feed stocks with simple technical steps to provide good yields of methacrylic acid.

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