METHOD FOR PRODUCING CARBONYL COMPOUNDS

摘要

The invention relates to a method for producing carbonyl compounds of formula (I), wherein R<1> is a hydrogen atom or an alkyl radical with 1 to 3 C-atoms and R<2> is a hydrogen atom, a C2-C4-alkenyl radical which can be unsubstituted or substituted one to three times with C1-C3-alkyl or a radical of formula (II), wherein R<3> is a hydrogen atom or an oxygen atom together with R<4>, R<4> is the radical OR<6> or an oxygen atom together with R<3>, R<5> is a hydrogen atom, an alkyl radical with 1 to 8 C-atoms, a C2-C4-alkenyl radical which can be unsubstituted or substituted one to three times with C1-C3-alkyl or a cyclohexyl or cyclopentyl radical and R<6> is an alkyl radical with 1 to 4 C-atoms, a cyclohexyl or cyclopentyl radical or a radical of formula -CH2-CHO or -CH2-CH2-O-CH2-CHO by gas phase oxidation of methanol or alcohols of formula (III), wherein R<1> and R<5> have the meaning given above and R<7> is a hydrogen atom or a radical OR<8> and R<8> is a hydrogen atom, an alkyl radical with 1 to 4 C-atoms, a cyclohexyl or cyclopentyl radical or a radical of formula -CH2-CH2-OH or -CH2-CH2-O-CH2-OH with an oxygen-containing gas in the presence of catalysts containing copper and/or silver and optionally, a phosphor compound which is volatile in the reaction conditions, the quantity of phosphor (calculated as P) being up to 20 ppm in relation to the quantity in weight of alcohol used. The inventive method is characterised in that it uses a catalyst system consisting of one catalyst which is essentially phosphor-free and at least one catalyst containing phosphor-containing copper and/or silver.