Method for extracting lignin by using mixed solvent two-step method

A technology for mixing solvent and lignin, which is applied in the field of extracting lignin from lignocellulosic biomass, can solve the problems of increased separation difficulty, low lignin degradation activity, low extraction efficiency, etc., and achieves easy recycling, high separation efficiency, good degradation activity

Inactive Publication Date: 2017-12-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing methods use acid or alkali catalysis, and the extraction time is long, time-consuming and labor-intensive; and the lignin degradation activity obtained by extraction is low.
For example, the industrial Alcell method uses ethanol-water solvent, uses the acid produced in the process as a catalyst, and delignifies at 200°C; because of the presence of acid, degradation by-products will be produced during the delignification process, which increases the difficulty of separation Sun Runcang and others used inorganic acid as catalyst, organic acid or organic low-carbon alcohol aqueous solution as extraction system to extract lignin from wheat straw, extracted at 85°C for 4 hours, and the lignin yield was up to 94% (Ind.Crops Prod. ., 2006, 23, 180); Pan Xuejun et al. used ethanol aqueous solution to extract lignin in poplar wood at a temperature higher than 195°C. Due to excessive polymerization after bond breaking, the extraction efficiency was reduced, and the activity of the extracted lignin was not high at the same time. (Ind. Eng. Chem. Res., 2010, 49, 12156)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 5.0g of the treated lignocellulose and add it to a 300ml Parr kettle. First add 80mL methanol and 20mL water, replace with nitrogen 3 times, react at 100°C for 1h, cool down, and filter; the filter residue is added to the kettle again, 80mL tetrahydrofuran, After replacing 20 mL of water with nitrogen for 3 times, react at 120°C for 1 hour, cool down, and filter; the extracts obtained two times were distilled under reduced pressure to remove the organic solvent and combined; the final extract was added with excess distilled water, stirred vigorously, and then stood and filtered , Dry 4.3g of lignin.

Embodiment 2

[0024] Take 10.0g of the treated lignocellulose and add it to a 300ml Parr kettle. First add 80mL ethanol and 20mL water, replace with nitrogen 3 times, react at 100°C for 1h, cool down and filter;

[0025] The filter residue was added to the kettle again, 80mL 1,4-dioxane and 20mL water were added, and after nitrogen replacement three times, the reaction was carried out at 140°C for 1 hour, cooled down, and filtered; the extracts obtained twice were distilled under reduced pressure to remove organic solvents, Combine; add excess distilled water to the final extract, stir vigorously, stand, filter, and dry (40°C) to obtain 7.5 g of lignin.

Embodiment 3

[0027] Take 6.0g of the treated lignocellulose and add it to a 300ml Parr kettle, first add 50mL methanol, 50mL water, replace with nitrogen 3 times, react at 120°C for 0.5h, cool down, and filter;

[0028] The filter residue was added to the kettle again, 80 mL of ethylene glycol monomethyl ether and 20 mL of water were added. After nitrogen replacement for 3 times, the reaction was carried out at 100°C for 0.5 hours, cooled and filtered, and the extracts obtained twice were distilled under reduced pressure to remove the organic solvent and combined ; The final extract is added with excess distilled water, stirred vigorously, then stood, filtered, and dried to obtain 4.5 g of lignin.

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Abstract

Disclosed is a method for extracting lignin by using a mixed solvent two-step method. In the method, two mixed solvents with different properties are used as extracting agents for continuous extraction in an inert condition by two steps, so that lignin in lignocellulosic biomass is separated high effectively. The mixed solvents used in the method are separately an alcohol/water system and an ether/water system, and after extraction of the lignin, the used solvents can be recycled can used reused. The method provided by the invention can be used to separate lignin high effectively, and the obtained lignin by separation has good degradation activity, so that the method is easy to use for high-value use of lignin, and has an important application value.

Description

Technical field [0001] The invention relates to the field of comprehensive utilization of lignocellulosic biomass, in particular to a method for extracting lignin from lignocellulosic biomass by using a mixed solvent two-step method. Background technique [0002] Biomass resources are rich in reserves, green and renewable; comprehensive utilization of biomass resources in nature is the need for sustainable development. Lignin is one of the main components of lignocellulosic biomass, and its content in nature is second only to cellulose; its structure is diverse, and it is an amorphous three-dimensional network formed by phenylpropane structural units connected by CC or CO bonds. 状高polymer. So far, lignin is the only natural resource in nature that can provide renewable aromatic-based compounds. However, lignin is mainly discharged as waste in the pulp and paper industry, which is not fully utilized and causes environmental pollution. Therefore, the comprehensive and efficient u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 徐杰马阳阳杜中田夏飞高进苗虹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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