A method for efficiently separating lignocellulosic materials to obtain high-purity components

A wood fiber material, high-purity technology, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of environmental pollution, low comprehensive utilization rate, low utilization rate of wood fiber materials, etc., to broaden the scope of application and high value of use , good economic effect

Active Publication Date: 2021-08-10
桂林古膳食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Patent applications CN108359026A and CN111019015A are both the research results of the inventors of this application in the early stage, but they all take the extraction of water-insoluble xylan as the main purpose, regardless of the recycling of cellulose, water-soluble xylan, lignin, wood fiber The utilization rate of materials is low, and it is difficult to recover water-soluble xylan and lignin in its preparation method, and the cost is high
In addition, in the patent application CN108359026A, the method of removing lignin by membrane filtration to obtain pure xylan is expensive, and it is difficult to realize large-scale industrial production of xylan
Although the patent application CN111019015A mentions that the dealkalization treatment method can be electrodialysis, which can better maintain the macromolecular structure of water-insoluble lignin, water-soluble xylan and lignin cannot be recovered under this method.
[0013] In summary, limited by the technical level of extraction and separation of lignocellulosic materials, and the lack of understanding of the characteristics of hemicellulose components, the utilization of lignocellulosic materials in the prior art is generally limited to the utilization of one or two of them, rather than Pay attention to the use of the characteristics of each component in lignocellulosic materials to achieve high-efficiency and low-cost separation and utilization of each component, resulting in low comprehensive utilization rate, high cost and low added value of products in the existing lignocellulosic material development and utilization industry , serious environmental pollution

Method used

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  • A method for efficiently separating lignocellulosic materials to obtain high-purity components
  • A method for efficiently separating lignocellulosic materials to obtain high-purity components
  • A method for efficiently separating lignocellulosic materials to obtain high-purity components

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Embodiment 1

[0034] A method for efficiently separating lignocellulosic materials to obtain high-purity components, the steps are as follows:

[0035] (1) Crush the non-mildew and dry corncobs, put them into 10% sodium hydroxide solution for extraction for 3 hours, the ratio of solid to liquid is 1:10, and the extraction temperature is 90°C. After the leaching is finished, the solid-liquid separation is carried out after centrifugation with a centrifuge to obtain the solid phase and the extract; the solid phase is first washed twice with a sodium hydroxide solution with a mass concentration of 6%, and the solid-liquid separation is carried out after each washing; Combine the washing liquid and the extracting liquid to obtain a mixed solution A; then wash the solid phase with water to neutrality, and use a centrifuge to remove free liquid to obtain purified cellulose.

[0036] (2) The above mixed solution A is dealkalized with an alkali-resistant electrodialysis membrane, and the alkali in ...

Embodiment 2

[0041] A method for efficiently separating lignocellulosic materials to obtain high-purity components, the steps are as follows:

[0042] (1) After chopping, chopping and kneading the dry bamboo without mildew, put it into the sodium hydroxide solution with a mass fraction of 12% for 2 hours, the ratio of solid to liquid is 1:12, and the leaching temperature is 120°C. After the leaching, use a centrifuge to separate the solid and liquid to obtain the solid phase and the extract; wash the solid phase twice with a sodium hydroxide solution with a mass concentration of 6%, and perform a solid phase after each washing. Liquid separation; combining the washing liquid and the extracting liquid to obtain a mixed solution A; then washing the solid phase with water to neutrality, and using a centrifuge to remove free liquid to obtain purified cellulose.

[0043] (2) The above mixed solution A is dealkalized with an alkali-resistant electrodialysis membrane, and the alkali in the soluti...

Embodiment 3

[0048] A method for efficiently separating lignocellulosic materials to obtain high-purity components, the steps are as follows:

[0049] (1) Grind the non-mildew and dried bagasse into 8% potassium hydroxide solution for extraction for 2 hours, the ratio of solid to liquid is 1:10, and the extraction temperature is 100°C. After the leaching is finished, the solid-liquid separation is carried out after being centrifuged by a centrifuge to obtain a solid phase and an extract; the solid phase is first washed twice with a potassium hydroxide solution with a mass concentration of 6%, and the solid-liquid separation is carried out after each washing; Combine the washing liquid and the extracting liquid to obtain a mixed solution A; then wash the solid phase with water to neutrality, and use a centrifuge to remove free liquid to obtain purified cellulose.

[0050] (2) The above mixed solution A is dealkalized with an alkali-resistant electrodialysis membrane, and the alkali in the s...

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Abstract

The invention discloses a method for efficiently separating lignocellulosic materials to obtain high-purity components. The method sequentially separates and extracts cellulose, water-insoluble xylan, water-soluble xylan, water-insoluble lignin The cellulose, hemicellulose and lignin in natural lignocellulosic materials are all separated and recovered to produce high-purity, high-molecular-weight products. The method of the present invention extracts, separates and purifies lignocellulosic materials on the basis of fully understanding the characteristics of hemicellulose components, so as to realize high-efficiency and low-cost separation and utilization of each component in lignocellulosic materials, cellulose, Water-insoluble xylan, water-soluble xylan, and water-insoluble lignin have high recovery rate, high purity, and high utilization value. Using the method of the present invention to separate components of natural wood fiber materials has good economical efficiency and is feasible. Safety, production safety and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of utilization of natural wood fiber materials, in particular to a method for efficiently separating wood fiber materials to obtain high-purity components. Background technique [0002] Fiber materials are abundant renewable resources in nature, and the use of such resources as industrial raw materials has always attracted attention. Lignocellulosic materials are composed of three major parts: cellulose, lignin, and hemicellulose, and each component has very high industrial application value. In natural lignocellulosic materials, cellulose is tightly wrapped by hemicellulose and water-insoluble lignin, and the water-insoluble lignin and hemicellulose are linked by chemical bonds, and this chemical bond is usually an ester bond. Unstable features. Therefore, the treatment of lignocellulosic materials with a certain concentration of lye (usually sodium hydroxide) is considered to be an effective means to det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/14C08H7/00D21C5/00
CPCC08B37/0003C08B37/0057C08H6/00D21C5/00
Inventor 张永昌代兴华卢艺芳张永宁李赐玉张厚瑞
Owner 桂林古膳食品科技有限公司
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