Process for decolorizing aromatic dicarboxylic acids

Details Process for decolorizing aromatic dicarboxylic acids Process for decolorizing aromatic dicarboxylic acids

2007-01-16

2007-01-16

Zucker, Paul A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

Reexamination Certificate

active

11353815

ABSTRACT:
In a process for reducing the visible color of a crude aromatic dicarboxylic acid containing colored contaminants, an aqueous ammonia solution of the crude aromatic dicarboxylic acid is prepared and contacted with hydrogen in a reactor in the presence of a heterogeneous metal-containing catalyst that includes a noble metal and a support. The process is carried out under conditions of temperature, pressure, and contact time effective to reduce the visible color of the aromatic dicarboxylic acid.

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