A method and a system for producing nanocellulose, and nanocellulose

A nano-cellulose and cellulose technology, which is applied in the post-treatment modification of cellulose pulp, fiber raw materials, fiber raw material treatment, etc., can solve problems such as high energy consumption

Inactive Publication Date: 2014-01-01
UPM-KYMMENE OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem is e.g. caused by the particularly high energy consumption involved in the production of nanocellulose
Furthermore, it is challenging to implement the methods used in the laboratory for the production of nanocellulose at production scale

Method used

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  • A method and a system for producing nanocellulose, and nanocellulose

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Experimental program
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Embodiment

[0047] Nanocellulose is produced by refining cellulose by means of two different refiners. The first stage refiner is a low consistency refiner. The consistency of the slurry when introduced to the refiner was about 3%. The specific energy consumption (EOK) at this refiner is 100-300 MWh / h.

[0048] After the first refiner, the slurry is separated by means of a first separator. The first separator was a pressure separator with a 0.2 mm perforated frit. The concentration of the slurry fed to the separator was about 3%, and the reject material ratio of the separator was 10%. The ratio of fractions with a size smaller than 200 microns (so-called 200 fractions) in the acceptable material was 80-85%. The reject portion of the separator is conveyed back to the first refiner for refining, so that an amount of replacement unrefined cellulose is also conveyed to the first refiner, the amount substantially corresponding to The amount of slurry conveyed onwards from the first separa...

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Abstract

A method and system for producing nanocellulose are provided. Cellulose is refined by a first refiner, the refined cellulose is separated by a first separator in such a manner that at least part of it belongs to an accepted fraction, water is removed from the accepted fraction by a precipitator and the accepted fraction is refined by a second refiner to produce nanocellulose.

Description

technical field [0001] The present invention relates to methods and systems for preparing nanocellulose. The invention also relates to nanocellulose prepared by this method. Background technique [0002] The properties of nanoparticles are often significantly different from those of macroscopic substances. One such substance is nanocellulose, which has properties significantly different from those of ordinary cellulose. By using nanocellulose it is possible to provide products having eg better tensile strength, lower porosity and at least partial translucency when compared to using cellulose. Since nanocellulose is a gel-like material, nanocellulose also differs from cellulose in its appearance. Due to its properties, nanocellulose has become an ideal raw material, and products containing nanocellulose will have several uses in industry. [0003] Practically, implementing industrial-scale production of nanocellulose with state-of-the-art equipment is problematic. The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/16D21H11/08D21D1/20D21B1/04
CPCB01J19/00D21D1/20D21H11/08D21D5/02C08B1/00D21H11/16D21B1/00D21D1/00D21H11/18
Inventor A·维尼伊恩恩H·古斯塔夫森T·科斯基恩
Owner UPM-KYMMENE OYJ
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