Preparation method of cellulose nanofiber

A nanofiber and cellulose technology, applied in the field of resources, can solve the problems of environmental pollution and safety risks caused by strong acids, strong bases and toxic reagents, and achieve the effects of simple and safe reagents, increased molecular accessibility, and excellent performance.

Inactive Publication Date: 2015-05-27
NANTONG LIANHAIWEIJING BIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation method of cellulose nanofiber provided by the present invention solves the problem that the chemical method uses strong acid, strong alkali and toxic reagents to pollute the environment, and produces many side reaction products, which pose a safety risk

Method used

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  • Preparation method of cellulose nanofiber
  • Preparation method of cellulose nanofiber

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Soak 2-10mm long corn stalks in water until saturated, then put them into a steam explosion tank, hold the pressure for 10 minutes under a pressure of 1.8Mpa, and then release the pressure instantly to obtain steam-exploded corn stalks; add steam to the reaction kettle Exploded corn stalks and water, the mass ratio of steam-exploded corn stalks and water is 1:8, hydrolyzed at 180°C for 20 minutes, and after cooling, use vacuum pump to filter to obtain hydrolyzate and steam-exploded straw filter residue; steam-exploded straw filter residue After washing with water, place it in an autoclave, then add 80% ethylene glycol solution at a solid-to-liquid ratio of 1:7, heat to 210°C for extraction for 2.5 hours, and perform solid-liquid separation after cooling to obtain the extraction solution and cellulose solid; the extraction solution is distilled under reduced pressure to obtain ethylene glycol solution and lignin, in which ethylene glycol can be reused for circular extract...

Embodiment 2

[0030] Soak the bran in water until the water is saturated, then put it into a steam explosion tank, maintain the pressure under the pressure of 2.2Mpa for 5 minutes, and then release the pressure instantly to obtain the steam explosion bran; add the steam explosion bran and water into the reaction kettle , the mass ratio of steam-exploded bran and water is 1:10, hydrolyzed at a temperature of 190°C for 10 minutes, and after cooling, use a vacuum pump to carry out suction filtration to obtain hydrolyzate and steam-exploded bran filter residue; steam-exploded bran filter residue is washed with water After filtering, put it in a high-pressure reactor, then add 80% ethylene glycol solution at a solid-to-liquid ratio of 1:8, heat to 215°C for extraction for 2 hours, and perform solid-liquid separation after cooling to obtain the extraction solution and cellulose solid; The extraction solution is distilled under reduced pressure to obtain ethylene glycol solution and lignin, in whic...

Embodiment 3

[0032] Soak the bean dregs in water until the water is saturated, then put them into a steam explosion tank, maintain the pressure at a pressure of 1.5Mpa for 12 minutes, and then release the pressure instantly to obtain steam-exploded bean dregs. The mass ratio of bean dregs to water is 1:16, hydrolyzed at 170°C for 30 minutes, and then filtered with a vacuum pump after cooling to obtain the hydrolyzate and steam-exploded bean dregs filter residue; the steam-exploded bean dregs filter residue is washed with water and then subjected to high-pressure reaction In the still, add 90% ethylene glycol solution with a mass concentration of 90% according to the solid-to-liquid ratio of 1:9, heat to 200°C for extraction for 2 hours, and conduct solid-liquid separation after cooling to obtain the extraction solution and cellulose solid; the extraction solution is distilled under reduced pressure Finally, ethylene glycol solution and lignin are obtained, wherein ethylene glycol can be reu...

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Abstract

The invention relates to a preparation method of a cellulose nanofiber. The method comprises the following steps: with wood fiber biomass as a raw material, presoaking, and carrying out steam explosion pretreatment; carrying out high-temperature hydro-thermal treatment on pretreated materials; hydrolyzing hemicellulose, and carrying out washing suction filtration to obtain hemicellulose hydrolysate and filter residues rich in lignin; putting the filter residues into a high-pressure reaction kettle, adding an ethylene glycol solution, heating and extracting the lignin from the residues with ethylene glycol; extracting and carrying out solid-liquid separation to obtain a lignin extract liquid and cellulose solid; carrying out enzymolysis on the cellulose solid with cellulase and removing an amorphous region of the cellulose to obtain cellulose crystal; and carrying out high-pressure homogenizing on the cellulose crystal to obtain a cellulose nanofiber product. The cellulose nanofiber prepared by the method has the advantages of nanoscale, large specific surface area, high activity and high security.

Description

technical field [0001] The invention relates to the technical field of resources, in particular to a preparation method of cellulose nanofibers. Background technique [0002] Nanocellulose is a new type of polymer functional material with unique structure and excellent performance, and has good application prospects in many fields. In biological applications, nanocellulose has made great progress in carriers and biosensors; in the medical field, nanocellulose and inorganic materials are a hotspot in the manufacture of artificial tissues; The application of nanocellulose has also been paid attention to; the food industry is also an important field of nanocellulose application, and the source and use range have a tendency to expand; in addition, the composite of nanocellulose and magnetic materials is also a new hot spot. [0003] At present, the preparation of nanocellulose mostly uses chemical methods to pretreat lignocellulose. Chemical methods not only pollute the environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/00D21C5/00C12P19/14C12P19/04
Inventor 唐波陈赛刘文玉
Owner NANTONG LIANHAIWEIJING BIOLOGY
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