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Method for preparing nano-crystalline cellulose by taking corn stalks as raw materials and application thereof

A technology of nanocrystalline cellulose and corn stalks, which is applied in the fields of cellulose raw material pulping, cellulose pulp post-treatment, fiber raw material treatment, etc., can solve the problems of long preparation period, high cost, and comprehensive utilization of plant raw materials, etc. To achieve the effect of comprehensive utilization, environmental protection, low cost of raw materials, and strong comprehensive utilization

Inactive Publication Date: 2016-03-23
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these processes, either the comprehensive utilization of plant raw materials is not considered, or chlorine-containing reagents are used in the preparation process, which will cause environmental pollution
In addition, there are also studies on the preparation of nanocellulose by enzymatic method, but this method has the defects of long preparation period and high cost

Method used

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  • Method for preparing nano-crystalline cellulose by taking corn stalks as raw materials and application thereof
  • Method for preparing nano-crystalline cellulose by taking corn stalks as raw materials and application thereof
  • Method for preparing nano-crystalline cellulose by taking corn stalks as raw materials and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Pre-hydrolysis

[0044] Wash the corn stalks with water to remove impurities, cut them into 1-2cm long and 0.5cm wide sections after drying, and balance the moisture; then at 170°C, add water and glacial acetic acid, the amount of glacial acetic acid is 2% (glacial acetic acid and dry corn stalks The mass percent of skin), liquid ratio 5:1, process 30min, filter, wash with water;

[0045] (2) Kraft cooking

[0046] When the degree of sulfidation is 25%, the amount of alkali used is 16%, the liquid ratio is 5:1, steamed at 170°C for 60min, filtered, and washed with water;

[0047] (3) Bleaching

[0048] Add water and DTPA, pretreat for 30 minutes under the conditions of DTPA dosage 0.5%, slurry concentration 15%, temperature 40°C, pH 3, filter and wash with water;

[0049] Then at an oxygen pressure of 0.8MPa, add water, H 2 o 2 The dosage is 3%, the dosage of NaOH is 4%, the temperature is 80°C, MgSO 4 Dosage 0.4%, Na 2 SiO 3 The dosage is 3%, the pulp concent...

Embodiment 2

[0060] (1) Pre-hydrolysis

[0061] Wash the corn stalks with water to remove impurities, cut them into 1-2cm long and 0.5cm wide sections after drying, and balance the moisture; then at 170°C, add water and glacial acetic acid, the amount of glacial acetic acid is 2% (glacial acetic acid and dry corn stalks The mass percent of skin), liquid ratio 5:1, process 30min, filter, wash with water;

[0062] (2) Kraft cooking

[0063] When the degree of sulfidation is 25%, the amount of alkali used is 16%, the liquid ratio is 5:1, steamed at 170°C for 60min, filtered, and washed with water;

[0064] (3) Bleaching

[0065] Add water and DTPA, pretreat for 30 minutes under the conditions of DTPA dosage 0.5%, slurry concentration 15%, temperature 40°C, pH 3, filter and wash with water;

[0066] Then at an oxygen pressure of 0.8MPa, add water, H 2 o 2 The dosage is 3%, the dosage of NaOH is 4%, the temperature is 80°C, MgSO 4 Dosage 0.4%, Na 2 SiO 3 The dosage is 3%, the pulp conce...

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Abstract

The invention discloses a method for preparing nano-crystalline cellulose by taking corn stalks as raw materials. The method comprises the following steps: carrying out prehydrolysis on the corn stalks by glacial acetic acid; steaming by adopting a sulfate method; carrying out pre-blanching treatment by diethylenetriaminepentaacetic acid; adding H2O2, NaOH, MgSO4 and Na2SiO3; introducing oxygen gas, keeping oxygen pressure to be 0.6MPa-1.0MPa and treating the materials; immersing the materials into KOH at a temperature and stirring; carrying out acidolysis for 1h-3h; carrying out ultrapure water dialysis; carrying out ultrasonic treatment in an ice water bath; and freeze-drying to obtain the nano-crystalline cellulose. The method takes agricultural waste corn stalks as the raw materials, and the nano-crystalline cellulose is prepared by adopting a prehydrolysis-sulfate method steaming-green blanching-alkali refining-acidolysis-ultrasonic treatment process; and the process has the characteristics of low raw material cost, environmental friendliness and high comprehensive utilization.

Description

technical field [0001] The invention relates to a method for preparing nanocrystalline cellulose, in particular to a method for preparing nanocrystalline cellulose by using corn stalks as raw materials through prehydrolysis-sulfate cooking-green bleaching-alkali refining-acidolysis-dialysis-ultrasonic treatment Elemental methods and their applications. Background technique [0002] my country is a big agricultural country, and the total amount of crop straw produced every year accounts for about 20% to 30% of the world's total. According to the latest statistics, the amount of crop straw in the country is about 700 million tons per year, of which more than 150 million tons of corn straw. A large amount of corn stalks are burned in the field, which not only causes a waste of resources and energy, but also brings some pollution to the environment. Corn stalks are rich in cellulose, hemicellulose and lignin, which are inexhaustible and inexhaustible natural high molecular org...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C1/04D21C9/16D21C9/147D21C5/00
CPCD21C1/04D21C3/022D21C5/00D21C9/147D21C9/163
Inventor 李海明王安郭延柱马明帅周景辉毕佳捷
Owner DALIAN POLYTECHNIC UNIVERSITY
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