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Process for cleanly preparing cellulose by utilizing lignocellulose

A wood fiber and cellulose technology, applied in fiber raw materials, fiber raw material treatment, pulping with organic solvents, etc., can solve problems such as difficult water treatment and serious environmental pollution, and achieve the effect of improving extraction yield and broad development space

Active Publication Date: 2016-09-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrial methods for preparing cellulose are the sulfite method and the alkali method. These two methods require the use of a large amount of sulfite and high-concentration alkali solution respectively, causing serious environmental pollution and difficult water treatment in the later stage.

Method used

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  • Process for cleanly preparing cellulose by utilizing lignocellulose
  • Process for cleanly preparing cellulose by utilizing lignocellulose
  • Process for cleanly preparing cellulose by utilizing lignocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Use corncobs as raw materials to prepare cellulose. The specific method is: take 300g of corncobs that are crushed to a diameter of 1cm, add 500mL of dilute sulfuric acid solution with a mass fraction of 0.2%, place at 25°C for 10h, and press filter to discharge the unabsorbed acid solution Continue to reuse. Pour the acid-pretreated corn cobs into the steam explosion machine, and introduce a steam pressure of 1.0 MPa. The corn cobs stay in the retainer cylinder for 10 minutes, reduce the pressure to an atmospheric pressure, wash with water to obtain steam explosion materials, and dry them. Take 10g of dry steam explosion material, add 90mL of ethanol, 10mL of water, add 0.2g of sodium hydroxide, heat up to 200°C in an autoclave, stir at 300rmp, and react for 1h. After cooling to room temperature, filter and wash with water, and dry at 40°C. Take 5g of the dried material and add it to 50mL of dimethyl carbonate, add 17g of hydrogen peroxide, treat at 60°C for 2h, filte...

Embodiment 2

[0029] Prepare cellulose with straw as raw material, the specific method is: take 300g of straw, wash with water to remove dust and impurities, add 1.2L of oxalic acid solution with a mass fraction of 0.3%, place it at 80°C for 1 hour, press filter to discharge the unabsorbed acid solution Continue to reuse. Pour the acid-pretreated straw into the steam explosion machine, and introduce a steam pressure of 0.8MPa. The straw stays in the retainer cylinder for 10 minutes, and the pressure is reduced to an atmospheric pressure. The steam-exploded material is obtained by washing with water, and dried. Take 10g of dry steam explosion material, add 40mL of 1,4-dioxane, add 60mL of water, add 0.04g of ammonium hydroxide, heat up to 180°C in an autoclave, stir at 300rmp, and react for 5h. After cooling to room temperature, filter and dry at 50°C. Take 5g of the dried material and add it to 80mL of diethyl carbonate, add 25.5g of hydrogen peroxide, treat at 90°C for 0.5h, filter, wash ...

Embodiment 3

[0031] Use bagasse as raw material to prepare cellulose. The specific method is: take 300g of bagasse, wash it with water to remove impurities, add 1L of phosphoric acid solution with a mass fraction of 1%, place it at 40°C for 6 hours, press filter to discharge the unabsorbed acid solution and continue to reuse . Pour the acid-pretreated bagasse into the steam explosion machine, and introduce a steam pressure of 2.0 MPa. The straw stays in the retainer cylinder for 40 minutes, and the pressure is reduced to an atmospheric pressure. The steam explosion material is obtained by washing with water, and dried. Take 15g of dry steam explosion material, add 30mL of formic acid, 20mL of water, and 0.01g of potassium hydroxide, heat up to 280°C in a high-pressure reactor, stir at 300rmp, and react for 3h. After cooling to room temperature, filter and dry at 50°C. Take 5g of the dried material and add it to 500mL of cyclohexyl carbonate, add 51g of hydrogen peroxide, treat at 50°C for...

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Abstract

The invention provides a process for cleanly preparing cellulose by utilizing lignocellulose, belonging to the field of the biochemical industry. The method comprises the following steps of: using agricultural wood fiber wastes as raw materials, carrying out acid and steam explosion pretreatment and removing hemicellulose; adding steam exploded materials, organic solvents, alkalis and water to a high pressure reactor, raising the temperature to 80-280 DEG C, reacting at the temperature for 1-5 hours, reducing the temperature after reaction ends and carrying out filtration, thus obtaining weakly alkaline organic solvent materials, wherein the concentrations of the organic solvents are 40-90%; the additive amount of the alkalis accounts for 0.01-0.2% of the amount of the exploded materials; and treating the weakly alkaline organic solvent materials by catalyzing carbonic ester by hydrogen peroxide to generate peroxy acid, carrying out treatment at 50-90 DEG C for 0.5-3 hours and carrying out filtration and washing, thus obtaining cellulose, wherein 0.1-0.4mol of hydrogen peroxide is added to 1g of materials and the material concentration is 10-100g / L. The process combines steam explosion, weak alkalis, organic solvents and the method of generating peroxy acid by catalyzing carbonic ester by hydrogen peroxide. The whole process is clean, environmentally friendly and economically feasible.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and relates to a method for cleanly preparing high-purity cellulose by using agricultural wood fiber waste. Background technique [0002] Cellulose is one of the main components of biomass raw materials, accounting for about 40%. It is a renewable and biodegradable natural polymer with the most abundant reserves in nature. [0003] Cellulose is widely used. Using separated and purified cellulose as raw material, ester derivatives and ether derivatives can be prepared, which can be used in oil drilling, food, ceramic glazes, daily chemicals, graphite products, coatings, etc. In addition, it can also be used as building materials, such as dry powder mortar building materials, water-resistant putty powder for interior and exterior walls, adhesives, caulking agents, etc. The industrial methods for preparing cellulose are the sulfite method and the alkali method. These two methods require the use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/02D21B1/36D21C3/20D21C5/00
CPCD21B1/021D21B1/36D21C3/20D21C5/00
Inventor 王文雅王素君袁其朋
Owner BEIJING UNIV OF CHEM TECH
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