Patent ID: 6828463
Filing Date: 2004-12-07
Classification: B01J,C07C

Abstract:
A process for the preparation of aromatic carbonyl compounds of general formula (I)Arâ€”COâ€”Râ€ƒâ€ƒFormula (I) Ar represents an aromatic nucleus with one or more aromatic rings R is defined as hydrogen group (â€”H), paraffine group (â€”CnH2n+1) wherein, n is an integer more than or equal to 1), substituted paraffine groups, cycloparaffine group (â€”CmH2mâˆ’1) wherein, m is an integer greater than 2), substituted cycloparaffine group, substituted or unsubstituted aromatic nucleus containing one or more aromatic rings, by liquid phase catalytic oxidation, said process comprising the steps of: (a) pretreating a polyoxometallate anion exchanged hydrotalcite catalyst under a vacuum or gas atmosphere free from traces of moisture and carbon-dioxide at a temperature in the range 50-200Â° C., for a period sufficient to remove adsorbed moisture from the catalyst; (b) oxidizing an aromatic compound of general formula (II) in the presence of the pretreated polyoxometallate anion exchanged hydrotalcite catalyst Arâ€”CHXâ€”Râ€ƒâ€ƒFormula (II) wherein,Ar and R are as defined above X is hydrogen group (â€”H) or hydroxyl (â€”OH) group, (c) separating the products (I) from the reaction mixture; (d) washing the used catalyst by aromatic compound (II) or optionally washing the catalyst by non aqueous solvent and drying the washed catalyst; and (e) recycling the catalyst for subsequent reaction batch.