Method to produce aromatic dicarboxylic acids using cobalt and z

Details Method to produce aromatic dicarboxylic acids using cobalt and z Method to produce aromatic dicarboxylic acids using cobalt and z

1998-12-01

2000-11-28

Wilson, James O.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 51255

Patent

active

06153790&

ABSTRACT:
A process to produce terephthalic acid is provided, the process including the steps of: providing a feed stream comprising a dialkyl substituted aromatic and in an organic acid solvent: contacting the feed stream with an oxidant, the oxidant containing at least 50% by volume oxygen and at an oxygen partial pressure of at least 1 psia, at a temperature between about 80.degree. C. and about 130.degree. C., in the presence of a catalyst system comprising zirconium and cobalt, wherein the contacting is done in a stirred tank reactor; removing from the stirred tank reactor a vapor stream comprising the organic acid, water vapor and unreacted oxidant; condensing at least a portion of the organic acid and water from the vapor stream; separating at least a portion of the water from the organic acid back to the stirred tank reactor; returning at least a portion of the condensed organic acid back to the stirred tank reactor; continuously recovering from the stirred tank reactor a product comprising a diacid substituted aromatic; isolating solid crystals of diacid substituted aromatic from the reactor product; and recovering from the solid crystals a diacid substituted aromatic having a purity of preferably at least 97% by weight.

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Arthur W. Chester et al., "Zirconium Cocatalysis of the Cobalt-Catalyzed Autoxidation of Alkylaromatic Hydrocarbons," Journal of Catalysis 46, 308-319 (1977).
National Fire Protection Association 53 Guide on Fire Hazards in Oxygen-Enriched Atmospheres 1994 Edition.

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