Method for extracting lignosulphonate from sodium sulfite bamboo pulp waste liquor

Method for extracting lignosulphonate from sodium sulfite bamboo pulp waste liquor

  • CN 101,274,947 B
  • Filed: 03/05/2008
  • Issued: 09/26/2012
  • Est. Priority Date: 03/05/2008
  • Status: Active Grant
First Claim
Patent Images

1. method of from sodium sulfite bamboo pulp waste liquor, extracting sulfonated lignin is characterized in that:

  • A, red liquid is filtered, filter utility is a sieve, makes red liquid slough O-fiber;

    B, the red liquid after will filtering are sent into filter again, slough heteroproteose cell, solid shape impurity, particulate;

    C, redder liquid is sent into the membrane separation purification separation system, remove inorganic salt, organic carboxylate, low molecule glucide, low molecule sulfonated lignin;

    Red liquid behind d, the purifying is concentrated into the concentration of 24 °

    of Be-27 °

    of Be after evaporation;

    E, the red liquid after concentrating can directly perhaps add to be sent into drying machine behind the material and becomes dry powder, gets product.

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