Process for producing methacrylic acid by oxidative dehydration

Details Process for producing methacrylic acid by oxidative dehydration Process for producing methacrylic acid by oxidative dehydration

1981-08-28

1983-01-25

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

562599, 252435, 252437, C07C 51377, C07C 5705, C07C 67317

Patent

active

043704905

ABSTRACT:
Isobutyric acid is oxidatively dehydrogenated to methacrylic acid by passing a gaseous mixture of isobutyric acid, oxygen, nitrogen and optionally water vapor at temperatures of 300.degree.-450.degree. C. and pressures of 0.5 to 5 bar over a catalyst comprising molybdenum oxide, which also contains vanadium, phosphorous and a metal selected from the group consisting of alkali metals, alkaline earth metals, zinc, silver, aluminum, titanium, lead, manganese, iron, cobalt, nickel and tin, preferably precipitated on a solid silica support and calcined at 200.degree. to 400.degree. C. At conversion levels of 80 to 100% of the isobutyric acid used, a methacrylic acid selectivity of 60 to 74% is attained.

REFERENCES:
patent: 4061673 (1977-12-01), Onoda et al.
patent: 4249020 (1981-02-01), McNeil et al.
patent: 4307247 (1981-12-01), Shaw et al.

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