Method for the production of acrylic acid by heterogeneously-catalysed gas-phase oxidation
AssigneeBASF SE
InventorsGerhard Nestler, Juergen Schroeder
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Abstract
Acrylic acid is prepared from propene by means of gas-phase oxidation by a process in which a starting gas mixture which contains propene and steam and whose molar propene/steam ratio is ≧1 and whose propane content is ≦5% is passed at elevated temperatures through a fixed catalyst bed comprising successive catalyst part-beds A and B, the part-bed A passed through first containing, as active material, a mixed oxide containing the elements Mo, Bi and Fe and the part-bed B containing, as active material, a mixed oxide containing the elements Mo and V, in a manner such that at least 96.5 mol % of propene are converted in a single pass through part-bed A.
Claims8
A process for the preparation of acrylic acid from propene by means of gas-phase oxidation, in which a starting gas mixture which contains propene and steam and whose molar propene/steam ratio is ≧1 and whose propane content is ≦5% is passed at elevated temperatures through a fixed catalyst bed comprising successive catalyst part-beds A and B, the part-bed A passed through first consisting of, as active material, at least one mixed oxide containing the elements Mo, Bi and Fe and the part-bed B consisting of, as active material, at least one mixed oxide containing the elements Mo and V, in such a way that at least 96.5 mol % of propene are converted in a single pass through part-bed A.
Dependencies are inferred from the claim text.