Method for separating and extracting lignin from eucalyptus

A technology of lignin and eucalyptus, which is applied in the directions of lignin derivatives, chemical instruments and methods, organic chemistry, etc., can solve the problems of volatile toxicity, potential safety hazards, flammable organic solvents, etc. Fast processing and good structural integrity

Active Publication Date: 2016-08-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the shortcomings of organic solvents such as flammabil

Method used

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  • Method for separating and extracting lignin from eucalyptus
  • Method for separating and extracting lignin from eucalyptus

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Embodiment 1

[0029] 1. A method for selectively separating lignin from eucalyptus, the specific steps are as follows:

[0030] 1) After the eucalyptus trunk is crushed, the 40-60 mesh powder is screened out, and dried in a vacuum drying oven at 100±5°C and 0.01Mpa;

[0031] 2) Add 1g of eucalyptus powder and 10g of DES (the molar ratio of TEBA to LA is 1:9) into the reaction kettle successively, shake properly to mix the solid-liquid two phases evenly;

[0032] 3) Start the reactor, control the reaction temperature to 90°C, fix the rotation speed to 100rpm, and react for 8 hours;

[0033] 4) After the reaction is completed, the reactant is cooled to room temperature, and the reaction product is taken out, and the Buchner funnel is used for vacuum filtration, and the residue is washed with ethanol, and the filtrate obtained by suction filtration is concentrated by rotary evaporation at 70±5°C and 0.02Mpa. liquid, and recover ethanol;

[0034] 5) Add 50ml of deionized water to the obtained...

Embodiment 2

[0040] 1. A method for selectively separating lignin from eucalyptus, the specific steps are as follows:

[0041] 1) After the eucalyptus trunk is crushed, the 40-60 mesh powder is screened out, and dried in a vacuum drying oven at 100±5°C and 0.01Mpa;

[0042] 2) Add 1g of eucalyptus powder and 30g of DES (TEBA to LA molar ratio 1:3) into the reaction kettle successively, and shake properly to mix the solid-liquid two phases evenly;

[0043] 3) Start the reactor, control the reaction temperature to 90°C, fix the rotation speed to 100rpm, and react for 8 hours;

[0044] 4) After the reaction is completed, the reactant is cooled to room temperature, and the reaction product is taken out, and the Buchner funnel is used for vacuum filtration, and the residue is washed with ethanol, and the filtrate obtained by suction filtration is concentrated by rotary evaporation at 70±5°C and 0.02Mpa. liquid, and recover ethanol;

[0045] 5) Add 150ml of deionized water to the obtained conc...

Embodiment 3

[0051] 1. A method for selectively separating lignin from eucalyptus, the specific steps are as follows:

[0052] 1) After the eucalyptus trunk is crushed, the 40-60 mesh powder is screened out, and dried in a vacuum drying oven at 100±5°C and 0.01Mpa;

[0053] 2) Add 1g of eucalyptus powder and 30g of DES (TEBA to LA molar ratio 1:9) into the reaction kettle successively, shake properly to mix the solid-liquid two phases evenly;

[0054] 3) Start the reactor, control the reaction temperature at 90°C, and set the speed at 100rpm, and react for 8 hours; 4) After the reaction, the reactant is cooled to room temperature, and the reaction product is taken out, and the reaction product is filtered under reduced pressure using a Buchner funnel, and the reaction product is washed with ethanol Wash the residue, perform rotary evaporation on the filtrate obtained by suction filtration at 70±5°C and 0.02Mpa to obtain a concentrated solution, and recover ethanol;

[0055] 5) Add 150ml o...

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Abstract

The invention discloses a method for separating and extracting lignin from eucalyptus. The method includes the following steps of firstly, adding eucalyptus powder and deep eutectic solvent into a reaction kettle, controlling the reaction temperature to be 60-100 DEG C, and conducting stirring reaction for 4-10 h, wherein the deep eutectic solvent is prepared by evenly mixing lactic acid and benzyl triethyl ammonium chloride according to the molar ratio of 1:3 to 1:9; secondly, taking out a reaction product, conducting decompression and suction filtration, washing away residues through ethyl alcohol, conducting rotary evaporation on filtrate obtained through suction filtration to obtain a concentrated solution, recovering ethyl alcohol, adding deionized water to the concentrated solution, and conducting standing and separating to obtain mixed liquid containing sediment; thirdly, conducting centrifuging on the mixed liquid, conducting solid-liquid separation, and washing a solid phase through deionized water thoroughly to obtain regenerated lignin. Lignin in eucalyptus can be effectively extracted, and the purity of the product is 90% or above. The method is simple in process and mild in condition, biomass resource utilization efficiency is improved, and cost is reduced.

Description

technical field [0001] The invention relates to biomass pretreatment and component separation technology, in particular to a method for separating and extracting high-purity lignin from eucalyptus. Background technique [0002] Due to the advantages of large output, low pollution, and renewable, biomass is considered to be an ideal alternative energy source. Lignin is one of the biomass resources second only to cellulose in nature, and it is the only renewable substance with aromatic structure. Lignin is a natural aromatic polymer composed of propane units, which can be widely used in synthetic resins, surfactants, beneficiation flotation agents, refractory materials and other fields. Lignin separation and high-value technology has gradually received widespread attention. [0003] Lignocellulose has a complex structure. There are intramolecular and intermolecular hydrogen bonds in the cellulose molecular chain, and a highly crystalline network structure is formed in a mult...

Claims

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Application Information

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IPC IPC(8): D21C5/00C08H7/00
CPCC07G1/00D21C5/00
Inventor 常杰刘钧王菊付严
Owner SOUTH CHINA UNIV OF TECH
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