Process for preparing nicotinic acid and catalyst used in the method
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United States of America Patent
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Issued Date -
Oct 6, 2005
app pub date -
Jun 25, 2004
filing date -
Apr 5, 2004
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a process for preparing nicotinic acid, which comprises directly subjecting a mixture of 3-methylpyridine, oxygen, and water to a vapor phase oxidation in the presence of a catalyst consisting of, as active ingredients, vanadium oxide (V.sub.2O.sub.5) and transition metal oxide both of which are supported on a carrier, to give the nicotinic acid, wherein crystal size of the active ingredients on the surface of the carrier is controlled in a range of from 40 to 200 nm through use of transition metal oxide. The present invention further relates to a catalyst used in the oxidation. In the method according to the present invention, the nicotinic acid can be obtained in a higher conversion and a higher selectivity. Therefore, the manufacturing cost can be reduced.
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