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A method for preparing lignin-containing cellulose nanofibrils

A nanofibril and cellulose technology, which is applied in the direction of using microorganism/enzyme cellulose treatment, fiber raw material, fiber raw material treatment, etc., can solve the problems of environmental pollution, difficult recycling of chemical reagents, etc., and achieve reduced energy consumption and particle size distribution Small range, high efficiency effect

Active Publication Date: 2022-08-09
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of alkali extraction and sodium chlorite to remove lignin has the problem that chemical reagents are not easy to recycle, and to a certain extent, it is easy to cause environmental pollution.

Method used

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  • A method for preparing lignin-containing cellulose nanofibrils
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  • A method for preparing lignin-containing cellulose nanofibrils

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A method for preparing lignin-containing cellulose nanofibrils, the steps are as follows:

[0049] (1) Pulverization: select corncob as raw material, pulverize and screen it, select raw materials with meshes in the range of 60-80 meshes, and store them in a sealed manner for later use;

[0050] (2) extraction: the corncob raw material powder obtained by the above-mentioned screening is subjected to ethanol extraction, air-dried, stored, and used for subsequent use;

[0051] (3) Pretreatment: Weigh a certain amount of extracted raw material and deep eutectic solvent (the molar ratio of raw material and deep eutectic solvent is 1:25), mix thoroughly, stir at constant temperature, control temperature at 90°C, and rotate speed at 180rpm, so that deep eutectic solvent and raw material can be fully contacted and reacted, and the reaction times was 9 hours, and after the reaction finished, a certain amount of ethanol was added to the reaction system to terminate the reaction (...

Embodiment 2

[0056] A method for preparing lignin-containing cellulose nanofibrils, the steps are as follows:

[0057] (1) Pulverization: pulverize and screen the corncob raw materials, select the raw materials with meshes in the range of 60-80 meshes, and store them in a sealed manner for later use;

[0058] (2) extraction: the corncob residue raw material powder obtained by the above-mentioned screening is subjected to ethanol extraction, air-dried, stored, and for subsequent use;

[0059] (3) Pretreatment: Weigh a certain amount of extracted raw material and deep eutectic solvent (the molar ratio of raw material and deep eutectic solvent is 1:25), mix thoroughly, stir at constant temperature, control temperature at 90°C, and rotate speed at 180rpm, so that deep eutectic solvent and raw material can be fully contacted and reacted, and the reaction times was 9 hours, and after the reaction finished, a certain amount of ethanol was added to the reaction system to terminate the reaction (th...

Embodiment 3

[0065] A method for preparing lignin-containing cellulose nanofibrils, the steps are as follows:

[0066] (1) pulverization: pulverize and screen the collected wood flour raw materials, select fiber raw materials with meshes in the range of 60 to 80 meshes, and store them in sealed storage for future use;

[0067] (2) extraction: the wood flour raw material powder obtained by above-mentioned screening is after ethanol extraction, air-drying, storage, for subsequent use;

[0068] (3) Pretreatment: Weigh a certain amount of extracted raw material and deep eutectic solvent (the molar ratio of raw material and deep eutectic solvent is 1:12), mix them thoroughly, and use microwave heating to control the power range of 800W. , the treatment time is 3 minutes, and after the reaction is completed, a certain amount of ethanol is added to the reaction system to terminate the reaction (the ratio of the added mass of ethanol to the mass of the deep eutectic solvent is controlled at 3:1). ...

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Abstract

The invention relates to a method for preparing lignin-containing cellulose nanofibrils. The steps are as follows: (1) pulverization: pulverizing and screening the collected lignocellulosic raw materials; (2) extraction: extracting the raw material powder obtained by the above screening through ethanol extraction After extraction, air-dried, stored, and ready for use; (3) pretreatment; (4) biological enzyme treatment; (5) high-pressure homogenization treatment: the solid part obtained after the treatment in the above step (4) is prepared into a slurry suspension with a mass fraction of 0.5%-3% lignin-containing cellulose nanofibrils can be obtained by high-pressure homogenization treatment. The method of the invention fully combines the pretreatment methods of low eutectic solvent, biological enzymes and high pressure homogenization to prepare lignin-containing cellulose nanofibers. The method has the advantages of green and environmental protection, low equipment requirements, simple and convenient operation , the cost is reasonable and the product performance is stable, which can provide good technical support for the efficient production of nanocellulose.

Description

technical field [0001] The invention belongs to the technical field of efficient and high-value utilization of biomass resources and nano-cellulose resource utilization, in particular to a method for preparing lignin-containing cellulose nano-fibrils. Background technique [0002] Cellulose nanofibrils (CNF) not only have the characteristics of cellulose light weight, degradability, biocompatibility, and regeneration, but also because of their nano-size, good stability and abundant hydroxyl groups, make them suitable for chemical modification. It has attracted much attention in the fields of composite materials, electronic products, catalytic materials, biomedical materials and energy. Lignin containing cellulose nanofibrils (LCNF) can be prepared from lignin-containing cellulose raw materials, which effectively solves the cost problem caused by removing lignin from lignocellulosic raw materials. It effectively expands the raw material range of cellulose nanofibrils, and ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21B1/02D21B1/06
CPCD21C5/005D21B1/021D21B1/06Y02E50/10
Inventor 刘苇李晓玉侯庆喜
Owner TIANJIN UNIV OF SCI & TECH