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Method for separating and extracting cellulose nanocrystals and lignin from poplar powder

A nanocrystal and cellulose technology, applied in the directions of lignin derivatives, cellulose raw material pulping, chemical instruments and methods, etc., can solve the problems of economic loss, excessive energy consumption, waste of resources, etc., to reduce energy consumption, improve Economical, mild effect

Inactive Publication Date: 2019-12-10
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, most of the raw materials used for the preparation of cellulose nanocrystals are pulps that have been pretreated to remove lignin. In the pretreatment process of raw materials, a large amount of chemicals and energy consumption are needed. The process of removing lignin by high-temperature cooking of raw materials has greatly caused waste of resources and economic losses, resulting in excessive consumption of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 60g of formic acid and 40g of distilled water into a 500mL three-necked flask at 25°C, then add 20g of concentrated sulfuric acid with a mass fraction of 98%, control the temperature in an oil bath, raise the temperature to 70°C, and stir for 5 minutes to form a mixed acid system. Then add 1.5g of dry poplar wood powder with a particle size distribution between 0.1mm and 3mm to the system, continue to react at 80°C for 6h, add 100g of distilled water after the reaction, and then centrifuge at 8000r / min for 5min. Pour out the supernatant and retain the precipitated part, disperse the obtained precipitate with 200 g of distilled water, then centrifuge at a speed of 8000 r / min for 5 min, and repeat the centrifugal washing process 3 times with distilled water. Add 25g of 1mol / L NaOH solution to the precipitate obtained after washing, mechanically stir for 4h, then centrifuge at 8000r / min for 5min, separate the supernatant and the precipitate: add 100g of distilled water ...

Embodiment 2

[0020] Add 90g of formic acid and 40g of distilled water into a 500mL three-neck flask at 35°C, then add 5g of concentrated sulfuric acid with a mass fraction of 98%, control the temperature in an oil bath, raise the temperature to 90°C, and stir for 15 minutes to form a mixed acid system. Then add 6g of dry poplar wood powder with a particle size distribution between 0.1mm and 3mm to the system, continue to react at 90°C for 8h, add 400g of distilled water after the reaction, and then centrifuge at 8000r / min for 5min, pour Remove the supernatant and retain the precipitated part, disperse the obtained precipitate with 400 g of distilled water, then centrifuge at a speed of 10,000 r / min for 5 min, and repeat the centrifugal washing process 6 times with distilled water. Add 35 g of 1 mol / L NaOH solution to the precipitate obtained after washing, mechanically stir for 5 h, then centrifuge at 8000 r / min for 5 min, separate the supernatant and the precipitate: add 400 g of distilled...

Embodiment 3

[0022] Add 90g of formic acid and 40g of distilled water into a 500mL three-neck flask at 35°C, then add 20g of concentrated sulfuric acid with a mass fraction of 98%, control the temperature in an oil bath, raise the temperature to 70°C, and stir for 5 minutes to form a mixed acid system. Then add 6g of dry poplar wood powder with a particle size distribution between 0.1mm and 3mm to the system, continue to react at 70°C for 6h, add 100g of distilled water after the reaction, and then centrifuge at 8000r / min for 5min, pour Remove the supernatant and retain the precipitated part, disperse the obtained precipitate with 200 g of distilled water, centrifuge at a speed of 10000 r / min for 5 min, and repeat the centrifugal washing process 6 times with distilled water. Add 25g of 1mol / L NaOH solution to the precipitate obtained after washing, mechanically stir for 4h, then centrifuge at 8000r / min for 5min, separate the supernatant and the precipitate: add 100g of distilled water to th...

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PUM

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Abstract

The invention provides a method for separating and extracting cellulose nanocrystals and lignin from poplar powder, and belongs to the field of natural polymer material separation and extraction. According to the method, 1-6 parts by mass of the poplar powder is treated by a mixed acid system which is prepared from the components in parts by mass: 60-90 parts of organic acid, 40 parts of distilledwater and 5-20 parts of concentrated sulfuric acid with mass fraction being 98%, the reaction temperature is 70 DEG C-80 DEG C and the reaction time is 6h-8h, the organic acid is one of oxalic acid,formic acid and acetic acid, after the reaction is completed, the obtained lignin-containing cellulose nanocrystals are subjected to alkali treatment, and the cellulose nanocrystals and the lignin areseparated. The method omits the step of preparing the cellulose nanocrystals to perform pretreatment and delignification on fiber raw materials, and simultaneously obtains two products of the cellulose nanocrystals and the lignin. The process is simple and the cost is reduced.

Description

technical field [0001] The invention relates to the field of separation and extraction of natural polymer materials, in particular to a method for separation and extraction of cellulose nanocrystals and lignin from poplar wood powder. Background technique [0002] Lignocellulosic raw materials are the most abundant and cheap renewable biomass resources on the earth. They are mainly composed of cellulose, hemicellulose and lignin. With the increasing shortage of fossil resources and the increasing environmental pollution, environmental protection can Regenerated lignocellulose resources have been widely used in various fields. Cellulose nanocrystals are rod-shaped cellulose with nanoscale. Due to their high strength, high modulus, high crystallinity, high specific surface area, low thermal expansion coefficient, good dispersibility and biodegradability, they are widely used in packaging, printing, manufacturing, etc. Pulp and paper, sewage purification, electronic devices, d...

Claims

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Application Information

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IPC IPC(8): D21C3/04D21C3/00C08H7/00C07G1/00
CPCC07G1/00C08H6/00D21C3/003D21C3/04
Inventor 解洪祥司传领李颖王慧梁敏刘华玉刘坤张筱仪刘慰邹竹帆
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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