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Process for preparing wheatgrass cellulose with low pollution

A preparation process and technology of cellulose, applied in the field of natural polymers, can solve the problems of high environmental pollution of waste liquid, shortage of resources such as cotton and wood, limitation of production scale of high-purity cellulose and its microcrystalline cellulose, etc. Great economic and social benefits, high environmental protection effects

Inactive Publication Date: 2010-02-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the raw material cellulose for the preparation of microcrystalline cellulose is prepared from wood and cotton through a series of processes such as alkaline cooking, pulping and bleaching. The production process has great disadvantages: first, resources such as cotton and wood are relatively scarce , which limits the production scale of high-purity cellulose and microcrystalline cellulose; second, the existing cellulose separation technology mostly uses caustic soda cooking and chlorine-containing bleaching processes, and its waste liquid is highly polluting to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1) First, place the wheat grass in an aqueous ethanol solution with a volume concentration of 50% at a solid-to-liquid ratio of 1:3, and treat at 80° C. for 120 min to dissolve most of the lignin and hemicellulose in the wheat grass by the ethanol solution to obtain crude cellulose;

[0012] 2) Secondly, disperse the crude cellulose in water, the added crude cellulose accounts for 10% of the mass of the water, then adjust the pH to 8, and add 0.5% of the crude cellulose mass MgSO 4 As a protective agent, the oxygen pressure is 1.0MPa and the temperature is 130℃ for 120min to further remove lignin and part of hemicellulose;

[0013] 3) Then, filter and wash the crude cellulose product, add acetic acid to the washed crude cellulose product to adjust the pH to 4, then add water to make the mass concentration of the crude cellulose product be 20%, and at room temperature, feed into the fiber 0.2% of the quality of the crude cellulose was treated with ozone for 50 minutes t...

Embodiment 2

[0016] 1) First, place the wheatgrass in an ethanol aqueous solution with a volume concentration of 30% at a solid-to-liquid ratio of 1:8, and process it at 120° C. for 100 min to dissolve most of the lignin and hemicellulose in the wheatgrass by the ethanol solution. crude cellulose;

[0017] 2) Secondly, disperse the crude cellulose in water, the added crude cellulose accounts for 16% of the mass of the water, then adjust the pH to 10, and add MgSO with 1.2% of the crude cellulose mass. 4 As a protective agent, the oxygen pressure is 0.6MPa and the temperature is 100℃ for 90min to further remove lignin and part of hemicellulose;

[0018] 3) Then, filter and wash the crude cellulose product, add acetic acid to the washed crude cellulose product to adjust the pH to 2, then add water to make the mass concentration of the crude cellulose product be 40%, and at room temperature, feed into the fiber. Ozone with 0.8% mass of the crude product was treated for 70min to remove residu...

Embodiment 3

[0021] 1) First, place the wheat grass in an aqueous ethanol solution with a volume concentration of 80% at a solid-to-liquid ratio of 1:5, and treat it at 150° C. for 80 min, so that the ethanol solution dissolves most of the lignin and hemicellulose in the wheat grass, and obtains crude cellulose;

[0022] 2) Secondly, disperse the crude cellulose in water, the crude cellulose added accounts for 25% of the mass of the water, then adjust the pH to 13, and add MgSO with 0.8% of the crude cellulose mass. 4 As a protective agent, the oxygen pressure was 0.2MPa and the temperature was 80℃ for 60min to further remove lignin and part of hemicellulose;

[0023] 3) Then, filter and wash the crude cellulose product, add acetic acid to the washed crude cellulose product to adjust the pH to 5, then add water to make the mass concentration of the crude cellulose product 10%, and at room temperature, feed into the fiber 1.5% of the quality of the crude cellulose was treated with ozone fo...

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Abstract

The invention relates to a process for preparing wheatgrass cellulose with low pollution. The process comprises the following steps: putting wheatgrass into an ethanol water solution, dissolving mostof lignin and hemicellulose in the wheatgrass at high temperature, then dispersing the wheatgrass into water, adding MgSO4, introducing oxygen, filtering after further removing the lignin and part ofthe hemicellulose under a heating condition, washing a cellulose crude product, introducing ozone, removing the residual lignin and the residual hemicellulose to obtain a cellulose product; finally, filtering, washing the cellulose product, adding alkali, regulating the pH value to 8-12, adding H2O2, carrying out heat processing, filtering, washing to obtain a pure cellulose product after being refined. The invention adopts a low-pollution ethanol method to decompose the raw material of the wheatgrass, separates and refines the cellulose in the wheatgrass by a process adopting pollution-free chemical reagents, such as the oxygen, the ozone, the H2O2 and the like, to carry out subsequent processing, relieves the emergent shortage problem of common cellulose resources, such as wood, cotton and the like, and also makes full use of the agricultural waste of wheat straw resource.

Description

technical field [0001] The invention belongs to the technical field of natural polymers, and in particular relates to a low-pollution preparation process of wheat straw cellulose. Background technique [0002] Cellulose is the main raw material for preparing microcrystalline cellulose, which is a natural polymer product composed of free-flowing cellulose crystals and is widely used in various fields. Such as excipients used in medicine, emulsions and foam stabilizers in food industry, paste and milk cosmetic additives in light industry, etc. Usually, the raw material cellulose for preparing microcrystalline cellulose is prepared from wood and cotton through a series of processes such as alkaline cooking pulping and bleaching. , which limits the production scale of high-purity cellulose and its microcrystalline cellulose; second, the existing cellulose separation technologies mostly use caustic soda cooking and chlorine-containing bleaching processes, and the waste liquid is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 李金宝张美云修慧娟张伯坤陈菊
Owner SHAANXI UNIV OF SCI & TECH
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