Process for producing phthalic anhydride
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Feb 11, 1998
filing date -
Feb 25, 1997
priority date (Note) -
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Abstract
Process for producing phthalic anhydride by catalytic gaseous phase oxidation of o-xylene or naphthalene in the presence of catalyst, whereby the reaction is carried out in at least two separate reactors. The first reactor is a salt-cooled main reactor and the second reactor is a post-reactor without cooling means containing same or different catalyst as the first reactor, wherein the feed flow to the post reactor consists of only gaseous effluent from the first reactor and the gas flow in the second reactor takes place from up to down without saltbath cooling.
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