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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  • 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 canno

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

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Example Embodiment

[0028] Example 1

[0029] The cholinergic acid ratio of 1: 2: 0.05 was referred to in the three flask in three flasks of 1: 2: 0.05, and the mixture was heated under 60 ° C to heat the mixture. The transparent liquid is a low molten solvent (DES). After cooling to room temperature, it is stored in the dryer. It is called 2.00 Ke Danhong Powns (40-60) and 20 ml DES to add three flasks, 120 ° C for 20 minutes, and pour the slurry into 60 ml of 50% acetone solution after the reaction, stir for 3 hours at normal temperature. Leave a residue first and supernatant one. The residue was washed until the washing liquid was colorless, and the supernatant was combined with the washing liquid, concentrated to 30 ml. 15 ml of tetrahydrofuran was added to the concentrate and extracted three times. The extract was then concentrated to 15 ml, and 150 ml of saturated brine was added, stirred overnight, the solid was precipitated, and the filtration was obtained as a lignin, and the weight of the h...

Example Embodiment

[0031] Example 2

[0032]The cholinergic, glyoxylic acid and p-toluenesulfonic acid in three flasks were referred to as a 1: 2: 0.03 molar ratio of the molar ratio of 1: 2: 0.03, and the mixture was heated under 60 ° C and stirred. After cooling to room temperature, it is stored in the dryer. It is called 2.00 Kdan Red Powns (40 ~ 60) and 20 ml DES to add three flasks, 120 ° C for 120 minutes, and then pour the slurry into 60 ml 50% aqueous aqueous solution, stir for 3 hours at normal temperature. Leave a residue first and supernatant one. The residue was washed until the washing liquid was colorless, and the supernatant was combined with the washing liquid, concentrated to 30 ml. 15 ml of tetrahydrofuran was added to the concentrate and extracted three times. The extract was then incorporated to 15 ml, and 150 ml of saturated brine was added, stirred overnight, the solid was precipitated, and the filtration was obtained as lignin, and the weight of the heavy wood was 0.3333G, cal...

Example Embodiment

[0033] Example 3

[0034] The cholinergic acid ratio of 1: 2: 0.05 was referred to in the three flask in three flasks of 1: 2: 0.05, and the mixture was heated under 60 ° C to heat the mixture. The transparent liquid is a low molten solvent (DES). After cooling to room temperature, it is stored in the dryer. It is called 2.00 KD Danhong Powns (40 ~ 60) and 20 ml DES to add three flasks, 120 minutes at 100 ° C, and then pour the slurry into 60 ml of 50% acetone solution, stirring at normal temperature for 3 hours, Leave a residue first and supernatant one. The residue was washed until the washing liquid was colorless, and the supernatant was combined with the washing liquid, concentrated to 50 ml. 20 ml of tetrahydrofuran was added to the concentrate and extracted three times. Then, the extract was then concentrated to 30 ml, and 300 ml of saturated brine was added, stirred overnight, the solid was precipitated, and the filtration was obtained as a lignin, and the weight of the hea...

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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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