Process for the oxidation of alcohols to their corresponding carbonyl compounds.

摘要

1. Process for the preparation of aldehydes or of ketones by catalytic oxidation using molecular oxygen or a gas containing it, in a liquid medium, of primary or secondary alcohols of general formula (I) : R2 - CHOH - R1 (I) n which : - R1 and R2 , which are identical or different, denote : - a straight-chain or branched alkyl radical containing from 1 to 23 carbon atoms, - a straight-chain or branched alkenyl or alkynyl radical containing from 3 to 23 carbon atoms and in which the double or triple bond is not situated on the carbon atom bonded directly to the carbon atom bearing the OH group, - a straight-chain or branched alkadienyl or alkadiynyl radical containing from 5 to 23 carbon atoms and in which the carbon atom directly bonded to the carbon atom bearing the OH group does not comprise a multiple bond, - an alicyclic radical containing from 3 to 12 carbon atoms, - a phenylalkyl radical in which the alkyl moiety comprises 1 to 14 carbon atoms, it being possible for the various radicals indicated above to comprise one or more substituents such as a hydroxyl group, an alkoxy group containing from 1 to 4 carbon atoms, a nitro group, a nitrile group or a halogen atom, - R1 or R2 denotes a hydrogen atom, - R1 and R2 may together form a straight-chain or branched alkylene radical containing from 4 to 23 carbon atoms and having or not having one or more substituents such as a hydroxyl group, an alkoxy group containing from 1 to 4 carbon atoms, a nitro group, a nitrile group or a halogen atom, - R1 and R2 , separately or together, consist of a concatenation of several radicals chosen from the radicals which may be denoted by R1 and R2 , which are indicated above, - R1 and R2 are such that the formula (I) comprises at most 36 carbon atoms ; characterized in that : - the catalyst consists of a noble metal of Group VIII of the Periodic Classification of the elements associated with a metal chosen from the group comprising bismuth, lead, cadmium, mercury, indium, tellurium, tin, silver and their derivatives, which are deposited on the same single solid support, - the liquid medium consists of an organic solvent, - the reaction temperature is between 60 degrees C and 180 degrees C, and - the water formed is removed by azeotropic distillation.