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A method for the clean separation of lignin and hemicellulose from plant biomass

A plant biomass and hemicellulose technology, applied in the field of light industry processing, can solve the problems that affect the subsequent utilization of cellulose, fail to meet the national strategic requirements, and cannot be reused, etc., and achieve low difficulty and low cost of wastewater treatment , the effect of low production cost

Active Publication Date: 2020-11-17
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages. First, high-intensity lye cooking completely destroys the structure of hemicellulose and lignin, making it impossible to reuse; second, high-intensity lye cooking also destroys the fiber to a certain extent. The structure of cellulose affects the subsequent utilization of cellulose; finally, the most important thing is that the waste liquid after cooking with high-concentration lye has a large degree of pollution to the environment, which does not meet the current national strategic requirements for green production and sustainable development

Method used

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  • A method for the clean separation of lignin and hemicellulose from plant biomass
  • A method for the clean separation of lignin and hemicellulose from plant biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw material and place of origin: 500g apocynum raw hemp, Xinjiang

[0041] The separation method is as follows:

[0042] The first step, mechanical crushing step

[0043] Apocynum pulverizes, crosses 60 mesh sieves, obtains Apocynum powder;

[0044] The second step, microwave digestion processing step

[0045] Immerse the crushed apocynum powder into the microwave digestion solution, put it into the microwave digestion tank together, put it into the microwave digestion device, set the microwave digestion program, raise the temperature to 120°C within 15 minutes, keep it warm for 15 minutes, and then slowly cool down to 70°C. Take out the treated powder, use 10 times methanol to filter the powder, collect the filtrate and the solution in the reaction kettle together, and record it as solution A;

[0046] The mass ratio of each component of above-mentioned apocynum powder and microwave digestion solution is as follows:

[0047] Apocynum powder: methanol: glycerol: co...

Embodiment 2

[0055] Raw materials and origin: 500g ramie raw hemp, Hunan

[0056] The separation method is as follows:

[0057] The first step, mechanical crushing step

[0058] The ramie is pulverized and passed through a 60-mesh sieve to obtain ramie powder;

[0059] The second step, microwave digestion processing step

[0060] Immerse the crushed ramie powder into the microwave digestion solution, put it into the microwave digestion tank together, put it into the microwave digestion device, set the microwave digestion program, raise the temperature to 120°C within 15 minutes, keep it warm for 5 minutes, and then slowly cool down to 70°C. Take out the treated powder, filter the powder with 10 times methanol, collect the filtrate and the solution in the reaction kettle together, and record it as solution A;

[0061] The mass ratio of each component of above-mentioned ramie powder and microwave digestion solution is as follows:

[0062] Ramie powder: methanol: glycerin: concentrated su...

Embodiment 3

[0070] Raw materials and origin: 500g kenaf raw hemp, Xinjiang

[0071] The separation method is as follows:

[0072] The first step, mechanical crushing step

[0073] The kenaf is pulverized and passed through a 60-mesh sieve to obtain the kenaf powder;

[0074] The second step, microwave digestion processing step

[0075] Immerse the crushed kenaf powder into the microwave digestion solution, put it into the microwave digestion tank together, put it into the microwave digestion device, set the microwave digestion program, raise the temperature to 120°C within 15 minutes, keep it warm for 20 minutes, and then slowly cool down to 70°C. Take out the treated powder, use 10 times methanol to filter the powder, collect the filtrate and the solution in the reaction kettle together, and record it as solution A;

[0076] The mass ratio of each component of above-mentioned kenaf powder and microwave digestion solution is as follows,

[0077] Kenaf powder: methanol: glycerin: conce...

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Abstract

The invention provides a method for clean separation of lignin and hemicellulose from plant biomass. The method comprises the following steps: immersing crushed plant powder in a microwave digestion solution, placing a mixture of the microwave digestion solution and the crushed plant powder into a microwave digestion tank, placing the microwave digestion tank into a microwave digestion device, andsetting a microwave digestion procedure to obtain a first solution; subjecting the obtained powder to high-pressure carbon dioxide treatment to obtain an intermediate powder and a second solution; and putting the intermediate powder into a bleaching tank for corresponding treatment to finally obtain the pure product of plant cellulose. The method can be used for clean separation of lignin and hemicellulose, and the production cost is relatively low; the consumption of water, electricity, and gas is relatively low, the time consumption is low, and the usage amount of chemical reagents is smallduring the whole production process provided by the invention; only a small amount of sodium percarbonate, hydrogen peroxide and sulfuric acid are used, and methanol and glycerol can be recycled andreused; caustic soda is not used in a degumming process, and a sodium sulfite component which can cause the generation of sulfur dioxide exhaust gas is not used, so that the environmental protection pressure is small, and the wastewater treatment cost is relatively low.

Description

technical field [0001] The invention relates to the field of light industrial processing, in particular to a method for cleanly separating lignin and hemicellulose from plant biomass. Background technique [0002] Plant biomass mainly contains cellulose, hemicellulose and lignin, which is the largest source of organic matter resources in the world and is renewable. Among them, cellulose has the most extensive application value, and has a large number of applications in textile fiber production, paper pulping and nanocellulose. However, hemicellulose and lignin are generally removed as waste, and the existence of hemicellulose and lignin increases the difficulty of preparing cellulose. [0003] With the popularization of the concept of sustainable development and the increasing environmental protection pressure of traditional light industry, the clean separation and full component utilization technology of plant three elements (cellulose, hemicellulose and lignin) needs to b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00C08H8/00C08B37/14
CPCC08B37/0003C08B37/006C08H8/00
Inventor 韩光亭姜伟宋焱张元明周成凤
Owner QINGDAO UNIV