Process for the production of methacrylic acid from isobutyralde

Details Process for the production of methacrylic acid from isobutyralde Process for the production of methacrylic acid from isobutyralde

1982-10-26

1984-09-04

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

549532, 562531, 568483, 568594, 568691, C07C 57065, C07C 5127, C07C 4558, C07D30106

Patent

active

044698879

ABSTRACT:
To produce methacrylic acid, firstly, isobutyraldehyde is acetalized. The resultant acetal is cleaved into the isobutenyl ether and alcohol. The isobutenyl ether is oxidized with molecular oxygen or an oxygen-containing gaseous mixture in the presence of an alkaline solution at temperatures of 30.degree.-70.degree. C. to obtain the epoxide. This epoxide is hydrolyzed to the .alpha.-hydroxyisobutyraldehyde. The latter is then oxidized with concentrated or fuming nitric acid at temperatures of 20.degree.-110.degree. C. to produce .alpha.-hydroxyisobutyric acid, and methacrylic acid is obtained therefrom by splitting off water.

REFERENCES:
patent: 2389950 (1945-11-01), Bremner et al.
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patent: 2942007 (1960-06-01), Griffin et al.
patent: 3284494 (1966-11-01), Schoenbrunn
patent: 3562320 (1971-02-01), Woodward et al.
patent: 3666805 (1972-05-01), Volker et al.
patent: 4403098 (1983-09-01), Brockhaus et al.
Migrdichian Organic Synthesis, vol. 1, p. 257, N.Y., Reinhold, 1957.
Stanford Research Institute, SRI, vol. 11, 27-37.

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