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Process for the oxidative purification of terephthalic acid

  • US 20060128987A1
  • Filed: 02/02/2006
  • Published: 06/15/2006
  • Est. Priority Date: 12/09/2002
  • Status: Active Grant
First Claim
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1. A process to produce a purified carboxylic acid slurry said process comprising:

  • (a) oxidizing an aromatic feedstock in a primary oxidation zone to form a crude carboxylic acid slurry;

    (b) oxidizing said crude carboxylic acid slurry in a staged oxidation zone to form a staged oxidation product;

    wherein said staged oxidation zone comprises at least one staged oxidation reactor operated at a temperature of about 150°

    C. to about 280°

    C. (c) crystallizing in a crystallization zone said purified staged oxidation product to form a crystallized product;

    (d) removing in a solid liquid displacement zone impurities from said crystallized product to form said purified carboxylic acid slurry.

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