Preparation of acrylic acid by heterogeneously catalyzed partial gas phase oxidation of propylene
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jan 5, 2006
app pub date -
May 18, 2005
filing date -
Jul 1, 2004
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Abstract
The present invention relates to a process for preparing acrylic acid by two-stage heterogeneously catalyzed partial gas phase oxidation of propylene, in which the propylene source used is a preceding propane dehydrogenation and in which the first oxidation stage is operated with restricted propylene conversion, and unconverted propane and propylene present in the product gas mixture of the second partial oxidation stage are recycled substantially into the preceding propane dehydrogenation.
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