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Method for extracting cellulose from straw

A cellulose and straw technology, applied in fiber raw material processing, textile and papermaking, etc., can solve the problems of difficult bleaching, high requirements, and insufficient paper tenacity.

Inactive Publication Date: 2008-08-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Correspondingly, when used in papermaking, the resulting paper is not strong enough and difficult to bleach, resulting in lower quality paper
and recovery of black liquor which contains large amounts of silicates is very energy intensive
In addition, it has been reported that only hydrogen peroxide is used to gradually extract cellulose, but the reaction conditions are complex and demanding (Sun et al., Industrial Crops & Products, 2000, 12: p71)

Method used

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  • Method for extracting cellulose from straw
  • Method for extracting cellulose from straw
  • Method for extracting cellulose from straw

Examples

Experimental program
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Embodiment 1

[0028] The 20g wheat straw after pulverizing (removing the nodular part of the straw containing a large amount of silicon) was put into a Soxhlet extractor and extracted with 200ml volume ratio of 1: 1 mixed solution of toluene and ethanol for 24 hours, and then used 180 ml of 5% KOH solution was soaked in the extracted product for 12 hours, stirring slightly during this process. Then the obtained sample was filtered with suction, the filtrate was recovered, and the filtered product was washed with water for 3 times, then filtered with suction again and dehydrated. The obtained product was soaked in 150 ml of 0.4% sodium chlorite solution for 6 hours, and the pH value of the solution in which the sample was placed was adjusted to about 5.0 with slight stirring. Then the obtained product was suction-filtered, continued to be put into 5% KOH solution for overnight treatment, and the solid in the solution was filtered out. Rinse well with water until the pH value is neutral, and...

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Abstract

The invention relates to a method for abstracting cellulose from non-woody plants fiber raw materials such as straws and the like and in particular relates to a method for removing silicon and lignin to abstract the cellulose from the straws. The invention can simultaneously remove the silicon, the lignin and the like from the straws and can obtain the cellulose through processing organic solvent, inorganic alkaline solution, oxidizing solution and the like.

Description

field of invention [0001] The invention relates to a method for extracting cellulose from straw and other non-woody plant fiber raw materials and the cellulose obtained therefrom. In particular, the present invention relates to a method for extracting cellulose by simultaneously removing silicon and lignin from straw. Background technique [0002] Due to the destruction of ecological balance, desertification is becoming more and more serious, and the requirements for environmental protection and sustainable development are getting higher and higher. Straw plants such as wheat straw, rice straw and other crop residues are used as a new source of natural cellulose and used in papermaking industrial fibers. Alternative materials to wood are receiving more and more attention and research because of their extremely cheap and easy availability. [0003] Compared with wood, straw plants contain a relatively high content of silicon components. In the prior art, for extracting cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 黄勇于慧刘瑞刚
Owner INST OF CHEM CHINESE ACAD OF SCI
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