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Method for preparing cellulose and carboxymethyl cethylose by wood fibre material

A technology of carboxymethyl cellulose and lignocellulosic materials, applied in the field of preparing high-purity carboxymethyl cellulose, can solve the problems of consuming energy and chemical raw materials, discharging waste liquid containing sulfite, waste of resources and the environment, and achieving Easy handling, low production cost, and time-saving effect

Inactive Publication Date: 2008-07-30
广西壮族自治区药物研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It will consume a lot of energy and chemical raw materials, and cause waste of resources and environmental pollution
[0006] Chinese patent CN1522324 discloses a method of using sulfite to separate lignin from cellulose under alkaline components, high temperature and high pressure. There are sulfites in the liquid, which is easy to cause environmental pollution
At present, food and pharmaceutical grade carboxymethyl cellulose is mostly prepared from cotton linters, and the cost is relatively high

Method used

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  • Method for preparing cellulose and carboxymethyl cethylose by wood fibre material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Crush 20 grams of bagasse or wheat straw into pieces and granules to 0.1-2 mm with a pulverizer, add 200 ml of distilled water to soak to make a suspension, adjust the pH of the solution to 11-12 with 1N sodium hydroxide, add 30% Hydrogen peroxide, 750w microwave irradiation for 10 minutes. Add 1N hydrochloric acid to neutralize and adjust the pH to 6.5-7.5. After filtration, the remaining cellulose filter residue is washed repeatedly with 70% ethanol, and finally placed in a constant temperature drying oven to dry to constant weight. The resulting cellulose is identified by infrared spectroscopy. , quantitatively measure cellulose and lignin according to the literature method (Chen Hongzhang, Cellulose Biotechnology, Chemical Industry Press, first edition in July 2005, 231-237), and the cellulose content reaches 99%.

Embodiment 2

[0042] In a 250ml beaker, add 10g of the cellulose prepared in Example 1, 140ml of 95% ethanol, dropwise add 20g of 20% sodium hydroxide solution, and add 30% hydrogen peroxide, stir and basify at room temperature for 50min, then add 9g of a Ethanol solution of chloroacetic acid (1:1) was reacted under microwave irradiation for 10 min. After the reaction, the product was neutralized with 1N hydrochloric acid, the pH value was adjusted to 6.5-7.5, filtered, washed twice with 75%-85% ethanol, and washed once with 95% ethanol. Dry at 60°C and pulverize to obtain carboxymethyl cellulose product in the form of white powder.

Embodiment 3

[0044] Crush 20 grams of bagasse into pieces and particles to 0.1-2 mm with a pulverizer, add 200 ml of distilled water to soak to make a suspension, adjust the pH of the solution to 11-12 with 1N sodium hydroxide, add 5 ml of 30% hydrogen peroxide And 9g9g ethanol solution of chloroacetic acid (1:1), 750w microwave radiation for 10 minutes. After the reaction, the product was neutralized with 1N hydrochloric acid, adjusted to pH 6.5-7.5, filtered, washed twice with 75%-85% ethanol, and washed once with 95% ethanol. Dry at 60°C and crush to obtain white powdery carboxymethyl cellulose product directly.

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Abstract

The invention relates to a method, which is widely used for separating cellulose and lignin for wood fibre materials and preparing carboxymethyl cellulose. The method comprises the steps as follows: wood fibre is used as raw material; the wood fibre is swollen and basified by using alkaline alcohol solution firstly; peroxide is added, the cellulose and the lignin are separated under the microwave radiation, and high purity cellulose is prepared; and / or the alkaline alcohol solution of monochloroacetic acid is added to prepare the high purity carboxymethyl cellulose. The invention has the advantages of simple technology, environmental protection, lower cost and speediness, and has wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing cellulose and carboxymethyl cellulose, in particular to a method for separating lignin and cellulose from woody fiber-containing plants and preparing high-purity carboxymethyl cellulose. Background technique [0002] Lignocellulosic materials, such as various agricultural residues (corn straw, wheat straw, rice husk, straw and corncobs, etc.), forestry residues (branches and leaves from logging, dead trees, diseased trees, etc.), weeds, reeds , specially cultivated crops (such as pine, fir, poplar, willow, maple, sugar cane, sugar beet, sweet sorghum, etc.) Compounds of polymers such as cellulose, hemicellulose and lignin are the most extensive renewable biomass resources in the world. At present, these resources have not been fully developed and utilized, and some of them have caused pollution, such as incineration of straw and rice straw, discharge of waste from the agricultural product processing indu...

Claims

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Application Information

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IPC IPC(8): D21C5/00C08B11/12
Inventor 陈小刚刘布鸣秦卫华刘元程少威林霄
Owner 广西壮族自治区药物研究所有限公司
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