Separation method of lignocellulose raw material ingredients

A technology of lignocellulose and lignin, applied in the direction of pulping with inorganic alkali, can solve the problem of not realizing the separation of all components, and achieve the effects of less destructive, lower reaction temperature and less corrosiveness

Inactive Publication Date: 2014-07-16
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This approach increases hemicellulose yield but does not achieve full component separation

Method used

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  • Separation method of lignocellulose raw material ingredients
  • Separation method of lignocellulose raw material ingredients
  • Separation method of lignocellulose raw material ingredients

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the method for separating components of corn stalks, its steps and conditions are as follows:

[0021] (1) Separation of cellulose: preparation mass concentration is 2% H 2 o 2 solution, adjust the pH to 8 with 0.1M / L NaOH; according to the liquid-solid ratio of 15mL / g, add corn stalks and the solution into the flask, condense, reflux, stir, and react at a temperature of 40°C for 2h. After the reaction is completed, cool to room temperature, vacuum filter and wash the filter cake with distilled water, and dry the filter cake; weigh and calculate the cellulose recovery rate to be 94.3%.

[0022] (2) Separation of lignin: the filtrate of step (1) is adjusted to pH 3~4 with ω=18.3% hydrochloric acid, and flocculent precipitation is arranged, and by centrifugation, precipitation is separated from filtrate, and the solid obtained by separation is lignin The lignin after centrifugation was dried; it was weighed, and the recovery rate of lignin was calculated t...

Embodiment 2

[0025] Embodiment 2: the method for wood chip component separation, its steps and conditions are as follows:

[0026] (1) Separation of cellulose: replace corn stalks with sawdust, and adjust the pH to 10 with 0.1M / L NaOH; the rest are the same as step (1) in Example 1; the calculated cellulose recovery rate is 94.3%.

[0027] (2) Separation of lignin: with the step (2) of embodiment 1; Calculate the recovery rate of lignin to be 27%.

[0028] (3) Separation of hemicellulose: with the step (3) of embodiment 1; Calculate the recovery rate of hemicellulose to be 23.2%.

[0029] (4) The filtrate after alcohol analysis reclaims the ethanol wherein through vacuum distillation, and the remaining filtrate is recycled, and the method of use is the same as that of step (1) to step (3).

Embodiment 3

[0030] Embodiment 3: the method for the component separation of rice husk, its steps and conditions are as follows:

[0031] (1) Separation of cellulose: replace corn stalks with rice husks, and adjust the pH to 11 with 0.1M / L NaOH; the rest are the same as step (1) in Example 1; the calculated cellulose recovery rate is 87.3%.

[0032] (2) Separation of lignin: with the step (2) of embodiment 1; Calculate the recovery rate of lignin to be 53.6%.

[0033] (3) Separation of hemicellulose: with the step (3) of embodiment 1; Calculate the recovery rate of hemicellulose to be 767%.

[0034] (4) The filtrate after alcohol analysis reclaims the ethanol wherein through vacuum distillation, and the remaining filtrate is recycled, and the method of use is the same as that of step (1) to step (3).

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Abstract

The invention discloses a separation method of lignocellulose raw material ingredients. An aqueous solution containing NaOH and H2O2 and a lignocellulose raw material are added, according to a certain ratio of liquid to solid, into a reactor for reaction for separation of cellulose, lignin and hemicellulose; the used NaOH-H2O2 is low in corrosion and less in side reaction. A recovered ethanol solvent can be reused, the lignin and the cellulose in the lignocellulose raw material are damaged slightly, and the process reduces the reaction temperature, reduces the reaction time and saves the cost of production. The cellulose recovery rate of the method is 84.2%, the lignin recovery rate of the method is 66.6%, and the hemicellulose recovery rate of the method is 96.7%. Purity determination of each ingredient shows that the separated cellulose purity is 98.7%, the hemicellulose purity is 97.2%, and the lignin purity is 96.5%.

Description

technical field [0001] The present invention has designed a kind of method of lignocellulosic raw material component separation, in NaOH-H 2 o 2 A method for degrading and separating lignocellulosic raw materials under a system. Background technique [0002] Lignocellulosic feedstock is the most abundant renewable natural polymer resource on earth. In today's society, people are facing serious problems such as resource shortage and environmental pollution caused by the rapid consumption of mineral resources such as oil and natural gas. Therefore, the efficient use of renewable resources has become the focus of sustainable development of mankind. The development and utilization of lignocellulosic raw materials have great economic and social benefits. Lignocellulosic raw materials include straw, sawdust, rice husk, wheat straw, etc. my country has abundant lignocellulose raw material resources. The main components of lignocellulosic raw materials are cellulose, hemicellul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02C08H7/00C08B37/14
Inventor 张龙李聪张莉
Owner CHANGCHUN UNIV OF TECH
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