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Method for extracting nanocellulose and lignin from wood fiber raw material

A lignocellulosic raw material and nano-cellulose technology, which is applied in fiber raw material processing, natural cellulose pulp/paper, textiles and papermaking, etc., can solve the problem of high equipment requirements, poor β-1,4-glucosidic bond and hydrogen bond capacity , low yield of hydrolyzed nanocellulose, etc., to achieve the effect of increasing yield, reducing pulping and bleaching

Active Publication Date: 2019-09-06
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the traditional hydrolysis of concentrated acid to prepare nanocellulose has high requirements for equipment, and there is a lack of economical and environmentally friendly waste acid recovery methods
Oxalic acid is a solid acid that can be recovered by recrystallization at room temperature, but its acidity is weak (pK a =1.25), the ability to destroy β-1,4-glycosidic bonds and hydrogen bonds is poor, and the yield of hydrolyzed nanocellulose is low

Method used

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  • Method for extracting nanocellulose and lignin from wood fiber raw material
  • Method for extracting nanocellulose and lignin from wood fiber raw material
  • Method for extracting nanocellulose and lignin from wood fiber raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Extraction of nanocellulose and lignin by oxalic acid compounded with toluenesulfonic acid to hydrolyze poplar wood powder.

[0023] The concentrations of p-toluenesulfonic acid compounded oxalic acid are O20P55, O30P45, O40P35, O50P25, O60P15, where O refers to oxalic acid, P refers to p-toluenesulfonic acid, OxPy refers to the mass concentration of oxalic acid is x, and the mass concentration of p-toluenesulfonic acid Be y, wherein x takes 20wt%, 30wt%, 40wt%, 50wt%, 60wt%; y takes 55wt%, 45wt%, 35wt%, 25wt%, 15wt%;

[0024] Acid hydrolysis temperature Ti, wherein, Ti refers to i°C, and i is 90, 100, 110;

[0025] Acid hydrolysis time th, wherein, th refers to h min, and h is 30, 60, 120, 240.

[0026] Add oxalic acid, p-toluenesulfonic acid and water into a 100mL blue cap bottle in proportion, seal it and place it in an oil bath to dissolve, add 20-80 mesh poplar wood powder after the solid acid is completely dissolved, and magnetically Stir for 30-240 m...

Embodiment 2

[0039] Example 2: Extraction of nano-cellulose and lignin by compounding oxalic acid with toluenesulfonic acid to hydrolyze wheatgrass wood powder.

[0040] Add oxalic acid, p-toluenesulfonic acid and water in proportion (O50P25) to a 100mL blue cap bottle, seal and place in an oil bath to dissolve, add 20-80 mesh wheatgrass powder after the solid acid is completely dissolved, and set temperature (100 °C) at a speed of 500 rpm for 120 min with magnetic stirring. After acidolysis, filter and separate the filter residue and filtrate, and wash with hot water several times, transfer the washed filter residue to a dialysis bag, dialyze to neutrality, and extract nanocellulose by centrifugation. Adding water to the filtrate part of acid hydrolysis and filtration can precipitate lignin as precipitate.

[0041] The experimental results show that when the concentration of oxalic acid is 50%, the concentration of p-toluenesulfonic acid is 25%, the temperature is 100°C, and the acid hyd...

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Abstract

The invention discloses a method for extracting nanocellulose and lignin from a wood fiber raw material. The method is characterized in that raw wood fibers rich in celluloses, hemicelluloses and lignin are used as the raw material, and undergo a one-step acidolysis process to directly extract the nanocellulose and lignin. The method concretely comprises the following steps: oxalic acid is combined with p-toluenesulfonic acid to acidolyze the wood fiber raw material, filtration is carried out after the acidolysis is finished to separate filter residues and a filtrate, the filter residues are dialyzed, and then are centrifuged to obtain the nanocellulose; and water is added to the filtrate to precipitate a large amount of the lignin with a high purity and high added values.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a method for extracting nanometer cellulose and lignin from lignocellulosic raw materials. Background technique [0002] Nanofibers have become a research hotspot in the field of nanomaterials due to their nanometer size, high specific surface area, low density, biodegradability, excellent mechanical strength and optical properties, and the natural regeneration of raw fiber. At present, the main raw material for extracting nanocellulose is microcrystalline cellulose or bleached wood pulp whose main component is cellulose, and then extracts nanocellulose through chemical degradation or mechanical separation. However, the method of directly extracting nanocellulose from raw lignocellulosic raw materials rich in cellulose, hemicellulose and lignin is rarely reported. If nanocellulose is directly extracted from raw lignocellulosic raw materials, the process of pulping ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/20D21H11/00D21H11/12C08H7/00
CPCD21C3/20D21H11/00D21H11/12C08H6/00
Inventor 王旺霞谷峰唐香蔡照胜董继红邵景玲
Owner YANCHENG INST OF TECH
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