Patent ID: 7214727
Filing Date: 2007-05-08
Classification: B60C,C08B,D01F,D02G,Y10T

Abstract:
1. A method of preparing cellulose solution, comprising the steps of: (A) dissolving cellulose powder in a liquid-state, concentrated N-methylmorpholine-N-oxide (NMMO) solution to provide cellulose-containing NMMO solution containing 0.01 to 3 wt % cellulose with respect to the total weight of the cellulose-containing NMMO solution, wherein the concentrated NMMO solution contains 10 to 18 wt % water with respect to the total weight of the NMMO solution; and (B) feeding the cellulose-containing NMMO solution and additional cellulose powder into an extruder having a screw wherein the cellulose-containing NMMO solution and additional cellulose powder are subjected to dispersing, mixing, shearing, kneading, melting and measuring processes in the extruder so as to produce cellulose solution that is swollen and homogenized.