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Method for separating corncob cellulose by using ionic liquid

An ionic liquid and cellulose technology, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve problems such as separation process research that has not been seen before, and achieve the effect of smooth surface, good film-forming properties and dense structure.

Inactive Publication Date: 2012-10-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application on the separation of biomass components has not seen a more systematic separation process research

Method used

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  • Method for separating corncob cellulose by using ionic liquid
  • Method for separating corncob cellulose by using ionic liquid
  • Method for separating corncob cellulose by using ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Raw material handling

[0028] The corn cob raw material is recovered, dried in the sun to make the moisture content less than 6%; crushed by a high-speed multifunctional grinder for 5 minutes to 30 minutes, every crushed for 2 minutes, with an interval of 1 minute; the crushed material is passed through a 40 mesh to 60 mesh sieve; soaked in distilled water for 1.5 minutes h, filter and dry to obtain corn cob particles;

[0029] (2) Lignin removal

[0030] The 40-60-mesh corn cob raw material obtained by crushing was mixed evenly with 2% NaOH solution to form a mixed solution with a mass volume ratio of 1:20, and it was dissolved at 115 °C for 90 min. After the treatment is completed, filter, wash the filter residue with distilled water for 3 times, and fully vacuum-dry at 80°C to obtain corn cob palm cellulose;

[0031] (3) Cellulose dissolution

[0032] The ionic liquid was vacuum-dried at 90°C for 24 h; the corncob palm cellulose was mixed with the ionic liqui...

Embodiment 2

[0037] (1) Raw material handling

[0038] The corn cob raw material is recovered, dried in the sun to make the moisture content less than 6%; crushed by a high-speed multifunctional grinder for 5 minutes to 30 minutes, every crushed for 2 minutes, with an interval of 1 minute; the crushed material is passed through a 40 mesh to 60 mesh sieve; soaked in distilled water for 1.5 minutes h, filter and dry to obtain corn cob particles;

[0039] (2) Lignin removal

[0040] The crushed 40-60-mesh corncob raw material was mixed evenly with 1.5% NaOH solution to form a mixed solution with a mass-volume ratio of 1:20, and dissolved at 125°C for 90 min. After the treatment is completed, filter, wash the filter residue with distilled water for 3 times, and fully vacuum-dry at 80°C to obtain corn cob palm cellulose;

[0041] (3) Cellulose dissolution

[0042] The ionic liquid was vacuum-dried at 90°C for 24 hours; the corncob palm cellulose was mixed with the ionic liquid evenly to form...

Embodiment 3

[0047] The separation method of corn cob cellulose comprises the steps:

[0048] (1) Raw material processing

[0049] The corn cob raw material is recovered, dried in the sun to make the moisture content less than 6%; crushed by a high-speed multifunctional grinder for 5 minutes to 30 minutes, every crushed for 2 minutes, with an interval of 1 minute; the crushed material is passed through a 40 mesh to 60 mesh sieve; soaked in distilled water for 1.5 minutes h, filter and dry to obtain corn cob particles;

[0050] (2) Lignin removal

[0051] The crushed 40-60-mesh corncob raw material was mixed evenly with 2% NaOH solution to form a mixed solution with a mass volume ratio of 1:20, and was dissolved at 110°C for 90 min. After the treatment is completed, filter, wash the filter residue with water for 3 times, and fully vacuum-dry at 80°C to obtain corncob palm cellulose;

[0052] (3) Cellulose dissolution

[0053] The ionic liquid was vacuum-dried at 90°C for 24 hours; the c...

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Abstract

The invention relates to a method for separating corncob cellulose by using ionic liquid. According to the invention, an ionic liquid 1-allyl-3-methylimidazole chlorine salt is synthesized with raw materials of allyl chloride and 1-methylimidazole; and with the high solubility of the ionic liquid upon cellulose, the ionic liquid is used for separating and extracting cellulose in corncob. The method comprises the steps of corncob pretreatment, lignin removing, cellulose separation, cellulose extraction, and the like. The extraction rate of corncob cellulose is approximately 18.35%. With the method, the purity of the extracted corncob is high, and the film-forming property of the cellulose is good. According to the invention, a green solvent which is the ionic liquid is used as a dissolving medium. The solvent can be recovered and reused, such that the requirement of green production is satisfied.

Description

technical field [0001] The invention belongs to a preparation method of high-purity cellulose, in particular to a separation process of corncob cellulose. Background technique [0002] my country is rich in crop straw resources such as corn stalks, corncobs, bagasse, wheat straw, and rice straw, which are important biomass resources that can be developed and transformed, but they have not been fully utilized at present. The total content of cellulose and hemicellulose in corn cob exceeds 70%, and most of them are burned as agricultural waste, resulting in waste of resources and environmental pollution. Cellulose is the most abundant renewable polymer material bestowed by nature to human beings, and its effective utilization is of positive significance to the sustainable development of the global economy. There are many solvents for dissolving cellulose, such as viscose solution and cuproammonia solution, which are widely used in industry for dissolving cellulose. Wherein t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 郑志李超孟杨培周姜绍通李兴江罗水忠蔡克周
Owner HEFEI UNIV OF TECH
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