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Method for extracting poplar cellulose by coupling steam explosion method with weak alkali

A weak base extraction and cellulose technology, applied in the separation of raw materials, etc., can solve the problems of high cost and high consumption of acid and alkali chemicals

Inactive Publication Date: 2020-05-15
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to overcome the problems of large consumption of acid-base chemicals and high cost in the existing pretreatment technology, provide a simple and low-cost poplar wood cellulose extraction method, and realize the extraction of cellulose, hemicellulose and lignin Green and efficient separation of pigments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for extracting poplar wood cellulose with a steam explosion method coupled with a weak base, the specific steps are as follows:

[0014] Step 1: take the raw material of dry poplar chips, soak them in water for 12 hours, and obtain wet poplar chips with a moisture content of 25%;

[0015] Step 2: Weigh the wet poplar chips obtained in the above step 1 of a certain quality, and steam-explode for 15 minutes under a pressure condition of 1.8MPa to obtain the steam-explosion material;

[0016] Step 3: add water with 8 times the mass of the steam-exploded material, filter and wash it three times with eight layers of gauze, separate the washing liquid, obtain the steam-exploded solid material after cleaning, and dry the steam-exploded solid material at 60° C. for 12 hours;

[0017] Step 4: take the dried steam-exploded solid material in step 3, and remove lignin by alkali under the condition of sodium hydroxide with a mass concentration of 0.5%, to obtain high-conten...

Embodiment 2

[0019] A method of poplar wood cellulose extracted by a steam explosion method coupled with a weak base, the specific steps are as follows:

[0020] Step 1: take the raw material of dry poplar chips, soak them in water for 13 hours, and obtain wet poplar chips with a moisture content of 30%;

[0021] Step 2: Weigh the wet poplar chips obtained in the above-mentioned step 1 of a certain quality, and steam-explode for 20 minutes under the pressure condition of 2.0MPa to obtain the steam-explosion material;

[0022] Step 3: Add water 10 times the mass of the steam-exploded material, filter and wash it three times with eight layers of gauze, separate the washing liquid, obtain the steam-exploded solid material after cleaning, and dry the steam-exploded solid material at 60° C. for 13 hours;

[0023] Step 4: take the steam-exploded solid material dried in step 3, and remove lignin by alkali under the condition of sodium hydroxide with a mass concentration of 0.6%, to obtain high-co...

Embodiment 3

[0025] A method of poplar wood cellulose extracted by a steam explosion method coupled with a weak base, the specific steps are as follows:

[0026] Step 1: take the raw material of dry poplar chips, soak them in water for 14 hours, and obtain wet poplar chips with a moisture content of 35%;

[0027] Step 2: Weigh the wet poplar chips obtained in the above step 1 of a certain quality, and steam-explode for 25 minutes under the pressure condition of 2.3MPa to obtain the steam-explosion material;

[0028] Step 3: Add water with 18 times the mass of the steam-exploded material, filter and wash it three times with eight layers of gauze, separate the washing liquid, obtain the steam-exploded solid material after cleaning, and dry the steam-exploded solid material at 60° C. for 14 hours;

[0029] Step 4: take the steam-exploded solid material dried in step 3, and remove lignin by alkali under the condition of sodium hydroxide with a mass concentration of 0.8%, to obtain high-content...

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PUM

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Abstract

The invention belongs to the field of forest chemical industry, pulping and papermaking and wood biomass refining, and particularly relates to a method for extracting poplar cellulose by coupling a steam explosion method with weak alkali. According to the method, poplar is used as a raw material, a steam explosion solid material with high cellulose content is obtained through steam explosion pretreatment under optimized conditions, then alkali extraction lignin removal is carried out, and invalid adsorption of lignin to cellulase is reduced, so that high-efficiency and high-content cellulose extraction is realized. According to the method, the yield of the poplar fiber components is increased, and the method is expected to be expanded to cellulose component extraction of other wood fiber raw materials, and is an efficient, green and environment-friendly cellulose obtaining method.

Description

technical field [0001] The invention belongs to the fields of forest product chemistry, pulping and papermaking and woody biomass refining, and specifically relates to a method for extracting poplar wood cellulose by a steam explosion method coupled with a weak base. Background technique [0002] The cell wall of lignocellulosic biomass raw materials is mainly composed of cellulose, hemicellulose and lignin connected through complex actions and forms. The anti-degradation barrier formed by the composite structure of the cell wall of lignocellulosic biomass raw material has a protective effect on the plant itself, but it also hinders the conversion of lignocellulosic biomass to a certain extent. In order to improve the conversion efficiency of lignocellulosic biomass raw materials, it must be pretreated to deconstruct its dense structure, separate lignin and hemicellulose from non-cellulosic components, and expose fibers with enzyme contact sites. plain surface. [0003] As...

Claims

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Application Information

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IPC IPC(8): D21B1/36
CPCD21B1/36
Inventor 杨佳鑫徐蕊司传领王冠华张淑亚陈佳宁
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY