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Method for rapidly separating lignin with high yield by using green solvent

A green solvent, high-yield technology, applied in the field of lignin separation, can solve the problems of high energy consumption, long separation time, large molecular weight of lignin, etc., and achieve the effects of simple process operation, environmental friendliness and low cost

Active Publication Date: 2021-08-27
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the prior art has at least the following disadvantages: the separation time is long, the yield of lignin is generally lower than 80%, the molecular weight of the obtained lignin is relatively large, and it cannot be dissolved in a large amount in common organic solvents, and the solvent recovery used for lignin treatment consumes more energy. , which is not conducive to improving the economic and environmental benefits of the process

Method used

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  • Method for rapidly separating lignin with high yield by using green solvent

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Effect test

Embodiment 1

[0029] Weigh choline chloride, glyoxylic acid and p-toluenesulfonic acid in a three-necked flask with a molar ratio of 1:2:0.05, heat and stir at 60°C to obtain a homogeneous transparent liquid, which is the deep eutectic solvent (DES) , cooled to room temperature and stored in a desiccator. Weigh 2.00 grams of red poplar wood powder (40-60 mesh) and 20 milliliters of DES into a three-necked flask, and react at 120° C. for 20 minutes. After the reaction, the slurry is poured into 60 milliliters of 50% acetone aqueous solution, and stirred at room temperature for 3 hours. Centrifuge to obtain residue one and supernatant one. The residue one was washed until the washing liquid was colorless, and the supernatant one and the washing liquid were combined and then concentrated to 30 ml. 15 ml of tetrahydrofuran was added to the concentrated solution, and the extraction was repeated three times. Afterwards, the extracts were combined and concentrated to 15 ml, added to 150 ml of sa...

Embodiment 2

[0032]Weigh choline chloride, glyoxylic acid and p-toluenesulfonic acid in a three-necked flask with a molar ratio of 1:2:0.03, heat and stir at 60°C to obtain a homogeneous transparent liquid, which is the deep eutectic solvent (DES) , cooled to room temperature and stored in a desiccator. Weigh 2.00 grams of red poplar wood powder (40-60 mesh) and 20 milliliters of DES into a three-necked flask, react at 120° C. for 120 minutes, pour the slurry into 60 milliliters of 50% acetone aqueous solution after the reaction, stir at room temperature for 3 hours, and Centrifuge to obtain residue one and supernatant one. The residue one was washed until the washing liquid was colorless, and the supernatant one and the washing liquid were combined and then concentrated to 30 ml. 15 ml of tetrahydrofuran was added to the concentrated solution, and the extraction was repeated three times. Afterwards, the extracts were combined and concentrated to 15 ml, added to 150 ml of saturated salin...

Embodiment 3

[0034] Weigh choline chloride, glyoxylic acid and p-toluenesulfonic acid in a three-necked flask with a molar ratio of 1:2:0.05, heat and stir at 60°C to obtain a homogeneous transparent liquid, which is the deep eutectic solvent (DES) , cooled to room temperature and stored in a desiccator. Weigh 2.00 grams of red poplar wood powder (40-60 mesh) and 20 milliliters of DES into a three-necked flask, react at 100° C. for 120 minutes, pour the slurry into 60 milliliters of 50% acetone aqueous solution after the reaction, stir at room temperature for 3 hours, and Centrifuge to obtain residue one and supernatant one. The residue one was washed until the washing liquid was colorless, and the supernatant one and the washing liquid were combined and then concentrated to 50 ml. 20 ml of tetrahydrofuran was added to the concentrated solution, and the extraction was repeated three times. Afterwards, the extracts were combined and concentrated to 30 ml, added to 300 ml of saturated sali...

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Abstract

The invention provides a method for rapidly separating lignin with high yield by using a green solvent. The method comprises the following steps: (1) mixing and heating a first hydrogen bond donor, a second hydrogen bond donor and a hydrogen bond acceptor to obtain a homogeneous transparent ternary eutectic solvent; (2) adding a lignocellulose raw material into the ternary eutectic solvent obtained in the step (1), and carrying out heating treatment to obtain a slurry; (3) adding an acetone aqueous solution into the slurry obtained in the step (2), stirring, then filtering to obtain a filtrate, washing filter residues with an acetone aqueous solution until a washing solution is colorless, and combining the filtrate and the washing solution; and (4) performing evaporation concentration, then performing extraction, adding saturated salt water for regeneration, and finally obtaining the lignin. The process is simple and convenient to operate, low in cost and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of lignocellulose utilization, in particular to a method for separating lignin from lignocellulose. Background technique [0002] Lignocellulose is an extremely abundant renewable resource on the earth, lignin is one of its main components, mainly composed of syringyl propane (S unit), guaiacyl propane (G unit) and p-hydroxyphenylpropane (H unit) composition. Lignin is the only renewable aromatic polymer on earth and has the potential to partially replace petrochemical resources. It contains active groups such as phenolic hydroxyl group, alcoholic hydroxyl group and carbonyl group, which can be used to produce lignin adhesives, polyurethane and other materials; lignin also contains varying amounts of ether bonds, which can be used to produce phenolic monomers through hydrogenation catalysis. However, the structure of lignocellulose is complex, and there are interactions such as hydrogen bonds between ligni...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 游婷婷李海潮许凤罗朝兵李德强
Owner BEIJING FORESTRY UNIVERSITY
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