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Method for preparing cellulose nano-fibers based on biomass material

A biomass raw material and nanofiber technology, which is applied in the field of preparation of cellulose nanofibers, can solve the problems of difficult recovery of acid waste liquid, unsatisfactory cellulose purity, harmful ecological environment safety, etc., so as to avoid environmental problems and reduce chemical The generation of polluting waste and the effect of improving efficiency

Active Publication Date: 2017-11-14
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acid waste liquid produced by this separation method is difficult to recycle, and the chlorine-containing waste liquid is also harmful to the ecological environment; meanwhile, the purity of the cellulose separated by this method is not ideal.

Method used

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  • Method for preparing cellulose nano-fibers based on biomass material
  • Method for preparing cellulose nano-fibers based on biomass material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Dry the bagasse waste at 45°C and knead it into velvet; take 1000 g of the bagasse powder, carry out steam explosion and centrifugation under a pressure of 2.0 MPa, wash the product 5 times with distilled water, and freeze-dry it for later use; weigh the frozen 15g (dry weight) of the dried product was mixed with a formic acid-acetic acid aqueous solution mixed reagent (formic acid / acetic acid / water volume ratio 10 / 70 / 20) mixed with a solid-to-liquid ratio of 1:30, and heated to reflux at 100°C for 3h , while stirring at a speed of 400rpm; the reaction is stopped, the product is cooled to room temperature, and filtered with No. 4 (aperture is 5-15 μm) sand core funnel and washed to neutrality with distilled water; the resulting product is mixed with 1.5% hydrogen peroxide ( pH=10.0) mixed at a solid-to-liquid ratio of 1:30, reacted at 55°C for 3 hours, and then washed the reaction product with distilled water until neutral; made a 0.15% suspension of the product sample a...

Embodiment 2

[0052] The rice straw was air-dried under natural conditions, crushed through a 1mm sieve; 2000 g of the rice straw powder sample was subjected to steam explosion and centrifugal treatment under a pressure of 2.8 MPa, and the product was washed 5 times with distilled water, and freeze-dried for later use; 20g (dry weight) of the product was mixed with the mixed reagent of formic acid and acetic acid aqueous solution (formic acid / acetic acid / water volume ratio 5 / 80 / 15) with a solid-to-liquid ratio of 1:20, heated and refluxed at 90°C for 4h, and simultaneously Stir at a speed of 350rpm; when the reaction stops, the product is cooled to room temperature, then centrifuged at 4500rpm, and washed with distilled water until neutral; the resulting product is mixed with 3% NaOH solution at a solid-to-liquid ratio of 1:50 and heated Heat and stir for 2 hours; prepare the resultant sample into a 0.20% suspension, make it uniformly pass through a high-pressure homogeneous microfluidizer, ...

Embodiment 3

[0054] The wheat straw was air-dried under natural conditions and crushed through a 1mm sieve; 10 g (dry weight) of the wheat straw powder was weighed and mixed with a formic acid-acetic acid aqueous solution (formic acid / acetic acid / water volume ratio 30 / 50 / 20) to solidify Mix the liquid at a ratio of 1:25, heat and reflux at 107°C for 3 hours while stirring at a speed of 400rpm; after the reaction stops, cool the product to room temperature, and then filter it with a No. 3 (pore size of 15-40μm) sand core funnel and washed with distilled water until neutral; the resulting product was mixed with 1.8% hydrogen peroxide-0.18% cyanamide solution (pH=10.0) at a solid-to-liquid ratio of 1:30, reacted at 50°C for 4 hours, and then washed with distilled water until neutral The resultant sample is made into a 0.10% suspension, and it is uniformly passed through a high-pressure homogeneous micro-fluidizer, and processed 5 times under a pressure of 150MPa to obtain a dispersion of wheat...

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Abstract

The invention discloses a method for preparing cellulose nano-fibers based on a biomass material. The method comprises the following steps: carrying out drying and fining treatment on the biomass material; then, mixing the generated biomass material and an organic acid solvent, heating, reflowing and separating biomass cellulose; then carrying out nano fibration treatment on the separated biomass cellulose by adopting a physical method, so as to obtain the cellulose nano-fibers with high purity and a high length-diameter ratio. By adopting the method disclosed by the invention, the preparation efficiency is effectively improved and the cellulose nano-fibers with the high purity and the high length-diameter ratio can be prepared; the generation of chemical pollution wastes is reduced; meanwhile, a series of environment problems caused by the fact that chlorine is used in a traditional purification method are avoided.

Description

technical field [0001] The invention relates to a method for preparing cellulose nanofibers, in particular to a method for preparing cellulose nanofibers from biomass. Background technique [0002] Cellulose is the most abundant natural polymer compound in the world, and cellulose nanofibers (CNF, Cellulose Nanofiber) can be obtained through mechanical crushing, acid treatment or enzymatic hydrolysis. Cellulose nanofiber is a kind of ultrafine fiber, the diameter of each fiber is only 3-4nm, equivalent to about one-twentieth of the hair. Cellulose nanofibers have many excellent properties, such as high degree of polymerization, high crystallinity, high Young's modulus and high hardness, etc., so that they have been applied in the field of reinforced polymer nanocomposites; their degradable, hydrophilic The advantages of good quality, transparency, light weight and good biocompatibility make it show good application prospects in artificial biological tissues, biosensors, fle...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21B1/02D21B1/36C08J3/00D06M15/19D06M13/355D06M13/224D06M13/262D06M15/513
CPCC08J3/00C08J2301/02D06M13/224D06M13/262D06M13/355D06M15/19D06M15/513D06M2101/06D21B1/02D21B1/36D21C5/00
Inventor 刘琪宋吉青何文清郝卫平毛丽丽郭瑞
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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