Process for producing methacrylic acid
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United States of America Patent
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Mar 12, 1985
Grant Date -
N/A
app pub date -
Jul 14, 1978
filing date -
Jul 22, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing methacrylic acid by the vapor phase catalytic oxidation of methacrolein with molecular oxygen or a molecular oxygen-containing gas comprises using a catalyst of multi-elemental complex oxide having the formula Mo.sub.a P.sub.b As.sub.c Cu.sub.d Cr.sub.e X.sub.f O.sub.g wherein X represents at least one of element of Ce, Nd, W and Fe; a, b, c, d, e, f and g respectively represent atomic ratios and a=12, b=0.5 to 3.0, c=0.01 to 1.2, d=0.01 to 2.0, e=0.05 to 2.0 and f=0 to 1.0; and g is decided on the valences of the other components such as usually 37 to 58 which is prepared with or without a reduction using a dibasic carboxylic acid, an oxycarboxylic acid, mannitol or pyrogallol.
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