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PROCESS FOR OBTAINING CELLULOSE

  • US 20160168790A1
  • Filed: 07/25/2014
  • Published: 06/16/2016
  • Est. Priority Date: 07/25/2013
  • Status: Active Grant
First Claim
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1. A process for obtaining cellulose or a mixture containing at least cellulose and at least lignocellulose from at least one substrate that is at least to some extent amenable to fermentation comprising at least the steps (1) to (3) and optionally (4), namely(1) conversion of the substrate via addition of at least one inorganic base into an aqueous mixture having a p≧

  • 8.5,(2) ultrasound treatment of the aqueous mixture obtained after step (1),(3) separation of the aqueous mixture obtained after step (2) into a liquid aqueous phase and a disperse mixture containing cellulose or a mixture containing at least cellulose and at least lignocellulose and(4) optionally purification of the disperse mixture obtained after step (3) containing cellulose or a mixture containing at least cellulose and at least lignocellulose,wherein step (1) and step (2) of the process are both carried out at a temperature of <

    100°

    C. andwherein the ultrasound treatment in step (2) is effected in one or more treatment phases, where the duration of a treatment phase is in the range from 0.2 to 60 seconds and each treatment phase is carried out at a sonotrode frequency in a range from 14 to 22 kHz.

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