PROCESS FOR PREPARING AN ORGANIC ACID OR ITS DERIVATIVES USING A HOMOGENEOUS MC-TYPE CATALYST AND AN O2/CO2 MIXTURE
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United States of America Patent
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Issued Date -
Apr 17, 2008
app pub date -
Aug 24, 2007
filing date -
Oct 12, 2006
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Abandoned
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Abstract
The present invention relates to a process for producing an organic acid or its derivatives, which comprises oxidation of a hydrocarbon substrate in the presence of a homogeneous MC-type catalyst and an oxidant. In particular, the present invention relates to a process comprising oxidation of a hydrocarbon substrate in the presence of a homogeneous MC-type catalyst selected from Co/Br, Mn/Br, Co/Mn/Br and Co/Mn/M/Br and an O.sub.2/CO.sub.2 mixed gas oxidant where the partial pressure of O.sub.2 is controlled to 30-40%, thereby improving the oxidation rate, the conversion, the selectivity and the yield even under milder conditions. Especially, the present invention remarkably reduces down to a negligible level the production of color impurities and other impurities such as 4-CBA and p-toluic acid, which had been conventionally removed by hydrogenation reduction. Further, the loss in acetic acid solvent due to combustion can also be drastically decreased using the method of the present invention.
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