Heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid

A process for the catalyzed partial gas phase oxidation of acrolein to acrylic acid comprises processing a reaction mixture comprising acrolein, molecular oxygen and at least one inert gas in a molar ratio of O 2 to C 3H 4O of at least 0.5 in a reaction step using a fixed catalyst bed comprising a m...

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Bibliographic Details
Main Author DIETERLE MARTIN,PETZOLDT JOCHEN,ARNOLD HEIKO,RUPPEL WILHELM,MULLER-ENGEL KLAUS JOACHIM
Format Patent
LanguageEnglish
Published 26.04.2006
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:A process for the catalyzed partial gas phase oxidation of acrolein to acrylic acid comprises processing a reaction mixture comprising acrolein, molecular oxygen and at least one inert gas in a molar ratio of O 2 to C 3H 4O of at least 0.5 in a reaction step using a fixed catalyst bed comprising a multi metal oxide containing Mo and V whereby the fixed catalyst bed comprises two separate temperature zones A and B arranged in series. A process for the catalyzed partial gas phase oxidation of acrolein to acrylic acid comprises processing a reaction mixture comprising acrolein, molecular oxygen and at least one inert gas in a molar ratio of O 2 to C 3H 4O of at least 0.5 in a reaction step using a fixed catalyst bed. The catalyst comprised a multi metal oxide containing Mo and V whereby the fixed catalyst bed comprises two separate temperature zones A and B arranged in series. The temperature zones are maintained at 230-320[deg]C, such that the volume specific activity within a fixed catalyst zone is essentially constant and has a step-wise increase in the flow direction of the aqueous reaction mixture by transfer from one fixed catalyst zone to the other. A conversion of 45-85 mol.% acrolein is achieved in zone A; an acrolein conversion of at least 90 mol.% with selectivity to acrylic acid of at least 90 mol.% achieved by a single pass through the total fixed catalyst bed with flow through A followed by B. The catalyst bed loading of acrolein is at least 70 Nl acrolein per liter of catalyst bed per hour; the difference between the maximum temperatures in both zones A and B is at least 0[deg]C; whereby the transition from temperature zone A to temperature zone B does not occur with a transfer from one fixed catalyst zone to another fixed catalyst zone.
Bibliography:Application Number: CN200480008097