Process for the preparation of benzaldehyde in the gas phase

Details Process for the preparation of benzaldehyde in the gas phase Process for the preparation of benzaldehyde in the gas phase

C - Chemistry, Metallurgy

07

C

252/94, 260/566.

C07C 45/51 (2006.01) B01J 23/34 (2006.01) B01J 37/03 (2006.01) C07C 45/41 (2006.01) C07C 47/52 (2006.01)

Patent

CA 1308119

ABSTRACT The invention relates to the preparation of a benzaldehyde by hydrogenation of a corresponding benzoic acid in the gas phase in the presence of a manganese containing catalyst on an acid carrier. The invention is characterized in that use is made of a catalyst prepared by: a) coprecipitation, at a pH between 7 and 10, of a manganese salt and a salt from which an acid carrier is formed, b) subsequent calcination at a temperature between 300 and 700°C, c) followed by reduction with a hydrogen containing gas mixture. Preferably the catalyst contains oxides of aluminium, zirconium, titanium, hafnium and/or niobium.

565862

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