PROCEDE DE PREPARATION D'ALDEHYDES ET D'ACIDES INSATURES AU DEPART DE PROPYLENE ET D'ISOBUTYLENE

In the oxidation of propylene or isobutylene, with molecular oxygen in a tube-shaped fixed-bed reactor with the formation of a mixture of acrolein and acrylic acid, or methacrolein and methacrylic acid, respectively, the reaction temperature can be controlled in an excellent manner when an oxidation...

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Bibliographische Detailangaben
1. Verfasser:	DAVID ROGER BRIDGEMAN, SERGE ROMAN DOLHYJ ET ERNEST CARL MILBERGER
Format:	Patent
Sprache:	fre
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING GENERAL METHODS OF ORGANIC CHEMISTRY MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SOLDERING OR UNSOLDERING THEIR RELEVANT APPARATUS TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	In the oxidation of propylene or isobutylene, with molecular oxygen in a tube-shaped fixed-bed reactor with the formation of a mixture of acrolein and acrylic acid, or methacrolein and methacrylic acid, respectively, the reaction temperature can be controlled in an excellent manner when an oxidation catalyst system is used in which the catalysts have two forms which differ physically. The catalyst which is the first to be brought into contact with the reactants is composed of an essentially inert carrier material with a coating of catalytic material. The second catalyst, which is then brought into contact with the reactants, is essentially composed of catalytic material only. The good temperature control allows the conversion rate to be increased substantially.