Increased selectivities in the oxidation of olefins to...

Details Increased selectivities in the oxidation of olefins to... Increased selectivities in the oxidation of olefins to...

C - Chemistry, Metallurgy

07

C

260/520.5

C07C 51/25 (2006.01) B01J 23/44 (2006.01) C07C 57/03 (2006.01)

Patent

CA 1238053

ABSTRACT OF THE DISCLOSURE Olefins such as propylene are oxidized directly to .alpha.,.beta.-unsaturated carboxylic acids such as acrylic acid with air or oxygen in an aqueous medium, employing an activated palladium-on-carbon catalyst, in the presence of a free radical inhibitor such as butylated hydroxytoluene. The catalyst pretreatment consists of reducing it with propylene at temperatures of at least about 60°C for at least about 10 minutes in the substantial absence of oxygen. In a like manner isobutylene may be oxidized to methacrylic acid, while butene-1 May be oxidized to crotonic acid.

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