Forming solutions

Forming solutions

  • CN 101,636,416 A
  • Filed: 01/10/2008
  • Published: 01/27/2010
  • Est. Priority Date: 01/17/2007
  • Status: Active Application
First Claim
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1. prepare the method for cellulose solution in liquid organic solvent, it comprises the steps:

  • (i) form the premixture that comprises Mierocrystalline cellulose, water and be suitable for cellulosic organic solvent;

    (ii) water and/or solvent hold the Mierocrystalline cellulose in the premixture that expands;

    (iii) utilize pump that premixture is pumped in the vertical orientated thin-film evaporator by supply line, high thin-film evaporator has the rotor of centrally-located, this rotor is suitable for premixture is spread upon on the inside of thin-film evaporator, and by vaporizer premixture is carried downwards;

    (iv) heat is applied on the wall of thin-film evaporator, and the internal pressure in the thin-film evaporator is reduced under the normal atmosphere;

    So that(v) evaporating some water enters in the solution in the liquid organic solvent to allow Mierocrystalline cellulose;

    And(vi) the cellulose solution the solvent is extracted out from the bottom of thin-film evaporator;

    It is characterized in that premixture being pumped in the thin-film evaporator with controllable mode, and supply line that substantially can be by not being suitable for premixture and the pressure difference between the thin-film evaporator inside are attracted in the thin-film evaporator with non-controllable manner by pump.

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