CATALYST SYSTEM FOR PREPARING CARBOXYLIC ACIDS AND/OR CARBOXYLIC ANHYDRIDES

CATALYST SYSTEM FOR PREPARING CARBOXYLIC ACIDS AND/OR CARBOXYLIC ANHYDRIDES

The present invention relates to a catalyst system for preparing carboxylic acids and/or carboxylic anhydrides which has at least three catalyst layers arranged one on top of the other in the reaction tube, with the proviso that the most inactive catalyst layer is preceded in the upstream direction...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: DOBNER, CORNELIA, WILMER, HAGEN, ROSOWSKI, FRANK, ALLMANN, HANS-MARTIN, STORCK, SEBASTIAN, LAUTENSACK, THOMAS, ZUEHLKE, JUERGEN
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Beschreibung
Zusammenfassung:The present invention relates to a catalyst system for preparing carboxylic acids and/or carboxylic anhydrides which has at least three catalyst layers arranged one on top of the other in the reaction tube, with the proviso that the most inactive catalyst layer is preceded in the upstream direction by a more active catalyst layer. The invention further relates to a process for gas phase oxidation in which a gaseous stream which comprises one hydrocarbon and molecular oxygen is passed through a plurality of catalyst layers, the least active catalyst layer being upstream of a more active catalyst layer.