Method and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenes
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United States of America Patent
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Apr 25, 2000
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Jun 16, 1998
filing date -
Jun 7, 1995
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Abstract
A method and apparatus for preparing purified terephthalic acid and, optionally, isophthalic acid from mixed xylenes. The method of the present invention purifies the oxidation reactor effluent containing a mixture of terephthalic acid and isophthalic acid as well as minor amounts of 4-carboxybenzaldehyde (4-CBA), 3-carboxybenzaldehyde (3-CBA), and toluic acid isomers, to produce purified terephthalic acid and, optionally, purified isophthalic acid in an integrated process.
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