Process for treating spent,waste, alkaline digestion liquid from paper pulping operations and product

Process for treating spent,waste, alkaline digestion liquid from paper pulping operations and product

  • CN 1,268,199 A
  • Filed: 05/29/1997
  • Published: 09/27/2000
  • Est. Priority Date: 05/29/1997
  • Status: Abandoned Application
First Claim
Patent Images

1. A processing contain residual lignin and liquid, the method for the cooking liquor that lost efficacy basically that obtains from the slurrying workshop of paper industry, this method comprises the following steps:

  • Water miscible surface-active polymer coagulant is mixed in the described inefficacy cooking liquor;

    Mixed liquid like this is acidified to the pH value less than 7, with release lignin and other organic compound wherein, and makes these materials condense into solid, this solid will swim in liquid surface;

    Solid and liquid after will condensing are separated from each other.

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