Polycarboxylic acid production system employing hot liquor removal downstream of oxidative digestion

Polycarboxylic acid production system employing hot liquor removal downstream of oxidative digestion

  • CN 104,892,391 A
  • Filed: 02/27/2007
  • Published: 09/09/2015
  • Est. Priority Date: 03/01/2006
  • Status: Active Application
First Claim
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1. manufacture a method for terephthalic acid composition, described method comprises:

  • A solvent feed is introduced primary oxidation reactor district by (), wherein at least the described solvent feed of 20wt% is the solvent of recirculation;

    B () makes oxidable compound be oxidized in described primary oxidation zone, produce initial slurry thus, it comprises original solid and original liquid, described original solid comprises terephthalic acid, wherein, based on combined solid and liquid slurry components, the typical sample of described slurry has at least 3 in following characteristics;

    (i) comprises and be less than 9, the m-phthalic acid (IPA) of 000ppmw, (ii) comprise and be less than 15, the phenylformic acid (BA) of 000ppmw, (iii) comprise and be less than 4 of 64ppmw, 4 '"'"'-dicarboxylate biphenyl (4, 4 '"'"'-DCB), (iv) comprise and be less than 2 of 70ppmw, 6-dicarboxyl Fluorenone (2, 6-DCF), v () comprises and is less than 2 of 12ppmw, 7-dicarboxyl Fluorenone (2, 7-DCF), (vi) 9-Fluorenone-2-carboxylic acid (9F-2CA) being less than 12ppmw is comprised, (vii) comprise and be less than 4 of 4ppmw, 4 '"'"'-dicarboxyl stilbene (4, 4 '"'"'-DCS), (viii) comprise and be less than 4 of 6ppmw, 4 '"'"'-dicarboxyl anthraquinone (4, 4 '"'"'-DCA), withC () makes the cooling temperature being cooled to 60-200 DEG C at least partially in optimized cooling zone of oxidation product slurry, produce the slurry of cooling thus, wherein said oxidation product slurry comprises the described original liquid of at least 30wt%,Wherein said oxidation is kept the operation of at least 1/2 day in the method using recirculation solvent manufacture terephthalic acid.

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