Heterogeneously catalyzed partial gas phase oxidation of...

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

Reexamination Certificate

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C562S598000

Reexamination Certificate

active

07019168

ABSTRACT:
In a process for partially oxidizing propene to acrylic acid in the gas phase under heterogeneous catalysis, a starting reaction gas mixture comprising propene and oxygen and having a specific composition is oxidized in a first reaction stage over a first fixed catalyst bed having a volume-specific activity which is constant or increases in the flow direction and the acrolein-containing product gas mixture of the first reaction stage is subsequently oxidized in a second reaction stage over a second fixed catalyst bed having a volume-specific activity increasing in the flow direction, and the shaped catalyst bodies of both fixed catalyst beds are annular and each have a specific multimetal oxide composition.

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