Method for Manufacturing Aromatic Dicarboxylic Acid
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United States of America Patent
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Issued Date -
Jan 31, 2008
app pub date -
Feb 6, 2006
filing date -
Feb 14, 2005
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Abandoned
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Abstract
The method for manufacturing aromatic dicarboxylic acid according to the formula 1 contains the first step of bringing a nitroaryl nitrile to react with a fluorenylidenebisphenol compound in the presence of an alkaline compound to obtain a corresponding di(cyanoaryloxy) derivative; and the second step of hydrolyzing the di(cyanoaryloxy) derivative to convert into a corresponding dicarboxylic acid, where, R1 to R6 are each independently a hydrogen, an alkyl group, or an aryl group, and they may be the same with or different from each other. Since the method does not use halide, the load to purification of the product is significantly light, and the aromatic carboxylic acid which is useful as a monomer for manufacturing polymers is readily obtained at a high purity.
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