Process for preparing methacrylic acid

Details Process for preparing methacrylic acid Process for preparing methacrylic acid

1979-04-16

1986-01-14

Lone, Werren B.

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

Organic compounds

Carboxylic acids and salts thereof

562532, 562535, 568471, 568477, 568478, 568479, 568480, C07C 5125

Patent

active

045647038

ABSTRACT:
In a process for preparing methacrylic acid by the vapor-phase catalytic oxidation of methacrolein or a methacrolein-containing mixture with molecular oxygen in the presence of an oxidation catalyst; the improvement wherein said process comprises
a first-stage oxidation step of oxidizing methacrolein or a methacrolein-containing mixture as a starting material,
a first-stage separating step of separating the resulting methacrylic acid from the reaction product obtained in the first-stage oxidation step,
a second-stage oxidation step of oxidizing the mixture containing the unreacted methacrolein and obtained in the first-stage separating step, and
a second-stage separating step of separating the resulting methacrylic acid from the reaction product obtained in the second-stage oxidation step, and
with or without at least one additional oxidation step and separating step subsequent to the second-stage separating step,
and wherein the conversion of methacrolein in the first-stage oxidation step is adjusted to 30-85 mole % and the final conversion of methacrolein is adjusted to at least 90 mole %.

REFERENCES:
patent: 3686294 (1972-08-01), Ito et al.
patent: 3976688 (1976-08-01), Akiyama et al.
patent: 4031135 (1977-06-01), Engelbach et al.
patent: 4035418 (1977-07-01), Okada et al.
patent: 4129600 (1978-12-01), Childress et al.

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