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Method for extracting lignin

  • US 20160326203A1
  • Filed: 01/09/2015
  • Published: 11/10/2016
  • Est. Priority Date: 01/10/2014
  • Status: Active Grant
First Claim
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1. A method for removing lignin from lignocellulosic biomass, the method comprising:

  • feeding lignocellulosic biomass and a first aqueous solution, which comprises at least 95 weight-% of water, into a reactor vessel, the lignocellulosic biomass and the first aqueous solution forming a reaction mixture,reducing the pressure in the reactor vessel below 0.8 bar absolute pressure, and thenheating the reaction mixture in a predetermined extraction temperature of 70-250°

    C., andadding at least one extraction chemical, which comprises a base or an acid, to the reaction vessel when the extraction temperature is reached, and extracting lignin from the biomass to the liquid phase of the reaction mixture.

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