Process for preparing a homogeneous cellulose solution using N-methylmorpholine-N-oxide

  • US 6,153,003 A
  • Filed: 02/10/1999
  • Issued: 11/28/2000
  • Est. Priority Date: 06/10/1996
  • Status: Expired due to Term
First Claim
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1. A process for preparing a homogeneous cellulose solution which comprises the steps of:

  • (a) preparing fibrillar cellulose powder;

    (b) injecting a molten liquid tertiary amine oxide solvent into a twin screw extruder;

    (c) feeding the cellulose powder of step (a) into a section of the twin screw extruder where the molten liquid tertiary amine oxide solvent fed in step (b) produces a well swollen paste with the cellulose powder fed in step (c);

    (d) dissolving the well swollen cellulose paste in the following melting sections in the twin screw extruder; and

    (e) stabilizing the solution obtained in step (d) in a storage tank.

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