Process for producing methacrylic acid and a catalyst

Details Process for producing methacrylic acid and a catalyst Process for producing methacrylic acid and a catalyst

B - Operations, Transporting

01

J

252/53.B, 260/52

B01J 23/00 (2006.01) C07C 51/25 (2006.01)

Patent

CA 1135245

ABSTRACT OF THE DISCLOSURE A catalyst having heteropoly-acid structure and the general formula: Image wherein, X represents one or more elements selected from the group consisting of tin, lead, cerium, cobalt, iron, zirconium, thorium, tungsten, germanium, nickel, rhenium, bismuth, antimony, chromium, boron, magnesium. silver, aluminum, zinc, and titanium and a, b, c, d, o, f, and g represent the atomic ratio of the elements where, a is 10, b is a number of 3 or less than 3 excluding 0, c is a number of 0.5 to 6, d is a number of 3 or less than 3 excluding 0, e is a number of 3 or less than 3 excluding 0, f ? a number of 0 to 3, g is a number determined depending on the valency and atomic ratio of other elements. There is also provided a process for producing methacrylic acid by oxidizing methacrolein with molecular oxygen or molecular oxygen-containing gas in the presence of the catalyst defined.

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