Process for producing methacrylic acid

Details Process for producing methacrylic acid Process for producing methacrylic acid

1987-10-06

1989-02-14

Garner, Vivian

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

Organic compounds

Carboxylic acids and salts thereof

502206, 502209, 562535, C07C 57055, C07C 5125, C07C 51305

Patent

active

048047783

ABSTRACT:
Disclosed is a process for producing methacrylic acid from methacrolein in high yields and at high selectivity which comprises vapor phase catalytic oxidation of methacrolein with molecular oxygen, characterized by using a catalyst represented by the formula: P.sub.a Mo.sub.b V.sub.c Cu.sub.d Zn.sub.e A.sub.f B.sub.g C.sub.h D.sub.i O.sub.j wherein P, Mo, V, Cu, Zn and O represent phosphorus, molybdenum, vanadium, copper, zinc and oxygen, respectively, A represents at least one element selected from the group consisting of antimony and iron, B represents at least one element selected from the group consisting of silicon, sulfur, selenium, scandium and gallium, C represents at least one element selected from the group consisting of potassium, rubidium, cesium and thallium, D represents at least one element selected from the group consisting of tungsten, magnesium, chromium, maganese, zirconium, tin, tantalum, bismuth, cerium, cadmium and boron, a-j indicate the atomic ratio of the respective elements and when b is 12, a is 0.1-3, c is 0.01-3, d is 0.01-3, e is 0.01-3, f is 0.1-5, g is 0.001-5, h is 0.01-3 and is 0-5 and j indicates the number of oxygen atoms necessary to satisfy valences of the respective elements.

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