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Method for extracting low-molecular-weight high-purity lignin from Chinese herb residues

A low molecular weight, traditional Chinese medicine slag technology, applied in the field of green utilization of traditional Chinese medicine solid waste resources, can solve the problems of restricting high-value utilization of lignin, structural damage, low lignin purity, etc. The effect of distribution and high purity

Pending Publication Date: 2022-05-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the structure of lignin is often further destroyed and other degradation products are produced in the process of biorefining, the purity of lignin obtained in the final refining is low, and the low molecular weight distribution and high purity limit the high lignin. value utilization

Method used

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  • Method for extracting low-molecular-weight high-purity lignin from Chinese herb residues
  • Method for extracting low-molecular-weight high-purity lignin from Chinese herb residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of deep eutectic solvent: under certain temperature conditions, choline chloride as hydrogen bond acceptor (HBA) and urea, ethylene glycol, glycerol, sulfuric acid / sulfuric acid as hydrogen bond donor (HBD) Glycerol, oxalic acid, and lactic acid acidified by ferric chloride are mixed according to the ratio of hydrogen bond acceptors: hydrogen bond donors, and magnetically stirred for a certain period of time until a colorless transparent homogeneous solution is obtained, which is a deep eutectic solution solvent (DES).

[0045] Extract low-molecular-weight high-purity lignin from traditional Chinese medicine dregs: add 2 g of licorice dregs and 20 g of deep eutectic solvent into a 100 mL single-necked round-bottomed flask, and mechanically stir for 30 min at room temperature to make the dregs fully contact with the deep eutectic solvent. Adjust the stirring speed to 150r / min and pretreat at 120°C for 3h. Cool down in a cold water bath after the reaction is ...

Embodiment 2

[0047] The preparation of deep eutectic solvent: with the choline chloride as hydrogen bond acceptor (HBA) and the lactic acid as hydrogen bond donor (HBD), according to hydrogen bond acceptor: the amount ratio of the different substances of hydrogen bond donor ( 1:2-1:10) and magnetically stirred for a certain period of time until a colorless and transparent homogeneous solution is obtained, which is a deep eutectic solvent (DES).

[0048] Extract low-molecular-weight high-purity lignin from traditional Chinese medicine dregs: add 2 g of ginseng dregs and 20 g of deep eutectic solvent into a 100 mL single-necked round bottom flask, and mechanically stir for 30 minutes at room temperature to make the dregs and deep eutectic solvent fully contact, Then adjust the stirring speed to 150r / min and pretreat at 120°C for 3h. After the reaction is over, cool down in a cold water bath; Suction filtration is carried out to realize solid-liquid separation; in the process of solid-liquid ...

Embodiment 3

[0051] The preparation of deep eutectic solvent: with the choline chloride as hydrogen bond acceptor (HBA) and the lactic acid as hydrogen bond donor (HBD), according to hydrogen bond acceptor: hydrogen bond donor respectively with the amount of different substances Ratio (1:2, 1:10) mixing, magnetic stirring for a certain period of time, until a colorless and transparent homogeneous solution is obtained, which is a deep eutectic solvent (DES).

[0052] Extract low-molecular-weight high-purity lignin from traditional Chinese medicine dregs: add 2 g of Eucommia ulmoides dregs and 20 g of deep eutectic solvent into a 100 mL single-necked round bottom flask, and mechanically stir for 30 minutes at room temperature to make the dregs and deep eutectic solvent fully contact, Then adjust the stirring and stirring speed to 150r / min and pretreat for 3h-36h under the condition of 120°C. After the reaction is finished, the cold water bath cools down; first add 90mL solution C (v 无水乙醇 :v ...

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Abstract

The invention discloses a method for extracting low-molecular-weight high-purity lignin from Chinese herb residues, which mainly comprises the following steps of: preparing a mixed solution by taking choline chloride as a hydrogen bond acceptor (HBA) and taking polyhydric alcohol, inorganic acid, carboxylic acid and the like as hydrogen bond donors (HBD) according to a certain amount-of-substance ratio, and forming a uniform solution at a certain temperature, namely a deep-eutectic solvent A; and adding the eutectic solvent A into the traditional Chinese medicine residue B, and carrying out high-temperature pretreatment to extract lignin. According to the method, the low-price non-toxic choline chloride is adopted as a hydrogen bond acceptor, the eutectic solvent is obtained under the mild condition, and the lignin structure and the chemical reaction activity can be well reserved while the high lignin extraction rate is obtained. The method provided by the invention is high in lignin extraction rate, low in molecular weight, high in purity, low in extraction cost, small in pollution, high in efficiency, easy in reaction control, simple in process and high in practicability.

Description

technical field [0001] The invention relates to the field of green utilization of traditional Chinese medicine solid waste residue resources, in particular to a method for extracting low-molecular-weight high-purity lignin from traditional Chinese medicine residue. Background technique [0002] As a big country of traditional Chinese medicine, my country has an annual production of more than 70 million tons of Chinese herbal medicines, and more than 35 million tons of waste generated during the processing of medicinal materials. The large amount of Chinese medicine dregs produced is a problem that cannot be ignored in today's society. Discarded traditional Chinese medicine solid waste is generally the roots, stems, leaves and other parts of plants, which contain rich lignocellulose. Lignocellulose is currently the largest renewable resource, with abundant reserves and output, and has broad application prospects, which can be converted into various products, such as chemicals...

Claims

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Application Information

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IPC IPC(8): C08H7/00C08H8/00
CPCC08H8/00
Inventor 庄永兵徐宾齐本坤李晨璐万印华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI