Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1997-02-03
1998-03-03
Barts, Samuel
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5142
Patent
active
057236593
ABSTRACT:
An improved process is disclosed for purifying impure aromatic polycarboxylic acids produced by the catalytic oxidation of polyalkylaromatic hydrocarbons which comprises contacting said impure acid with hydrogen and at least one hydrogenation catalyst, the improvement comprising said catalyst having a water insoluble and non-brittle coating of at least one polymeric material.
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Barts Samuel
Engelhard Corporation
Keller Raymond F.
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