Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid
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United States of America Patent
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Jul 27, 1999
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app pub date -
Jun 16, 1998
filing date -
Jun 7, 1995
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Abstract
A method for reducing carboxybenzaldehyde isomers in crude terephthalic and/or isophthalic acids is described. Crude TPA or IPA is dissolved in N-methyl pyrrolidone and is subsequently contacted with an oxidant, such as substantially anhydrous hydrogen peroxide, to convert the carboxybenzaldehyde isomer (4-CBA or 3-CBA) to TPA or IPA under moderate temperature and pressure conditions.
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