Process for the preparation of unsaturated acids from...

Details Process for the preparation of unsaturated acids from... Process for the preparation of unsaturated acids from...

C - Chemistry, Metallurgy

07

C

260/521.1

C07C 57/04 (2006.01) B01J 23/24 (2006.01) B01J 27/19 (2006.01) C07C 51/25 (2006.01)

Patent

CA 1059532

PROCESS FOR THE PREPARATION OF UNSATURATED ACIDS FROM UNSATURATED ALDEHYDES ABSTRACT OF THE DISCLOSURE Methacrylic acid or acrylic acid are produced by the oxidation of methacrolein or acrolein respectively, with molecular oxygen in the vapor phase in the presence of a catalytic oxide of molybdenum, phosphorus, and promoted with chromium or at least one element selected from the group consisting of thallium, rubidium, cesium, potassium, titanium and arsenic, or a mixture thereof, wherein at least part of the molybdenum employed in the preparation of the catalyst is supplied in the form of molybdenum trioxide. The oxidation of methacrolein in the presence of a catalyst wherein all the molybdenum employed in the preparation of the catalyst has been supplied by molybdenum trioxide gives especially desirable high yields and selectivities to methacrylic acid.

258069

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