Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid

Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid

  • CN 1,572,765 A
  • Filed: 06/04/2004
  • Published: 02/02/2005
  • Est. Priority Date: 06/05/2003
  • Status: Active Grant
First Claim
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1. reclaim the method for metal catalyst from mother liquor, described method comprises the following steps:

  • (a) evaporate the described mother liquor that contains carboxylic acid, described metal catalyst, impurity, water and solvent in first evaporating area, obtain vapour stream and spissated mother liquor stream;

    (b) evaporate described spissated mother liquor stream in second evaporating area, form the mother liquor stream of solvent-rich stream and hyperconcentration;

    (c) from the mother liquor stream of described hyperconcentration, separate organic impurity at solid-liquid disengaging zone water-solvent solution, form the aqueous stream and second aqueous stream;

    (d) in the mixing zone, water and optional extraction solvent are mixed with described aqueous stream and described second aqueous stream, form aqueous mixture;

    (e) extracting the district, in described aqueous mixture, adding and extract solvent, forming and extract stream and raffinate stream;

    With(f) choose wantonly and separate described extraction stream, the extraction solvent streams that forms high boiling point organic impurity stream and reclaim in the disengaging zone.

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