C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/214
C08B 1/00 (2006.01) D06L 1/12 (2006.01) D06L 1/18 (2006.01) D06L 1/22 (2006.01) D06L 3/02 (2006.01) D06L 3/10 (2006.01)
Patent
CA 2033694
ABSTRACT OF THE DISCLOSURE Disclosed is a method of extracting impurities from natural cellulose. The method includes placing the material in a kettle and evacuating the material preferably in the dry state. Subsequently, a treatment liquid is introduced into the kettle to impregnate the material. The treatment liquid may be lye or acid and may optionally contain other chemicals. The amount of the treatment liquid is not more than 3 parts by weight per part of the material. Subsequently, saturated steam of a temperature above 100°C is conducted through the impregnated material until an excess pressure of at most 8 bar is reached in the kettle. The material is kept at this pressure for about 1 to 5 minutes. After releasing the pressure from the kettle, the material is washed in the hot state. If necessary, the treatment steps can be repeated, possibly with the use of different recipes for the treatment liquids. By employing the evacuation step and a small amount of the treatment liquid, the treatment time is substantially reduced.
Fetherstonhaugh & Co.
Magin Berthold
Mtm Obermaier G.m.b.h.
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