polycarboxylic acid production system using cooled mother liquor from oxidative digestion as feed to impurity purge system

polycarboxylic acid production system using cooled mother liquor from oxidative digestion as feed to impurity purge system

  • CN 105,130,782 B
  • Filed: 02/27/2007
  • Issued: 12/17/2019
  • Est. Priority Date: 03/01/2006
  • Status: Active Grant
First Claim
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1. A process for making a polycarboxylic acid composition, said process comprising:

  • (a) Subjecting a multi-phase reaction medium to oxidation in a primary oxidation zone, thereby producing an initial slurry;

    (b) Subjecting at least a portion of said initial slurry to oxidative digestion in a digestion zone, thereby producing a digestion product slurry;

    (c) Cooling at least a portion of the digestion product slurry in a cooling zone, thereby producing a cooled slurry comprising a cooled liquid phase and a solid phase; and

    (d) Using a solvent purification system to remove at least one aromatic impurity present in a solvent purification feed introduced to the solvent purification system, wherein the cooled liquid phase of the cooled slurry forms at least 20wt% of the solvent purification feed;

    Wherein the oxidation in step (a) comprises;

    (a-i) subjecting a first portion of the multi-phase reaction medium to oxidation in a first reaction zone defined in an external reaction vessel;

    (a-ii) subjecting a second portion of said multi-phase reaction medium to oxidation in a second reaction zone defined in an inner reaction vessel, wherein said inner reaction vessel is at least partially disposed in said outer reaction vessel; and

    (a-iii) withdrawing a slurry phase of at least a portion of said reaction medium from said second reaction zone for producing an initial slurry.

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