Method for extracting low-molecular-weight lignin from walnut shells through graded sedimentation of alkaline tetrahydrofurfuryl alcohol

A tetrahydrofurfuryl alcohol and low molecular weight technology is applied in the fields of biomass pretreatment and comprehensive utilization of agricultural wastes, which can solve the problems of lignin dissolution rate and lignin purity, molecular weight and dispersibility need to be improved, and achieves a simple pretreatment method. The effect of convenience, simple steps and low processing temperature

Inactive Publication Date: 2021-10-22
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] Previous studies found that acidified tetrahydrofurfuryl alcohol has a good effect on the pretreatment of lignocellulose, but the lignin dissolution rate, lignin purity, molecular weight and dispersibility still need to be improved

Method used

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  • Method for extracting low-molecular-weight lignin from walnut shells through graded sedimentation of alkaline tetrahydrofurfuryl alcohol

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Embodiment 1

[0037] After the walnut shells are crushed, sieved, washed and dried, take 400g as the raw material for biomass pretreatment, divide it into 4 parts and transfer them to 1000mL blue cap bottles respectively, and add them according to the solid-liquid ratio of 1:5 500ml of 5% alkaline tetrahydrofurfuryl alcohol solution (w / w), then put into a sterilizer for reaction, the reaction temperature is 135°C, and the reaction time is 90min. After the pretreatment, after the non-woven fabric decompression suction filtration, take out the filtrate of 1000ml in the beaker, and add 3 times of volumes of water to dilute the organic solvent, then slowly adjust the pH to 6, a part of lignin (lignin fraction II) Settling out first, the filtrate is collected and adjusted to pH=4, another part of lignin (lignin fraction II) is settled out, the filtrate is collected, and its pH is adjusted to 2, and the last part of lignin (lignin fraction II) is settled out Lignin fraction III), after centrifuga...

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Abstract

The invention relates to a method for extracting low-molecular-weight lignin from walnut shells by graded sedimentation through alkaline tetrahydrofurfuryl alcohol. The method comprises the following steps: 1) crushing, sieving, washing and drying the walnut shells to obtain walnut shell powder, adding alkaline tetrahydrofurfuryl alcohol according to a certain solid-to-liquid ratio, conducting pre-treating at a certain temperature for a period of time to obtain mixed slurry, and performing reduced-pressure suction filtration on the mixed slurry to obtain a filtrate; 2) adding water into the filtrate, adjusting a pH value to 6, then carrying out primary centrifugation, and drying a precipitate to obtain a lignin fraction I; 3) adjusting the pH value of supernatant obtained after centrifugation to 4, then carrying out secondary centrifugation, and conducting drying to obtain a lignin fraction II; and 4) adjusting the pH value of a supernatant obtained after centrifugation to 2, then carrying out tertiary centrifugation, and performing drying to obtain a lignin fraction III. According to the method, the lignin is efficiently extracted from the walnut shells by using the alkaline tetrahydrofurfuryl alcohol, and then fractionation is performed through an acid precipitation method, so the lignin which is low in molecular weight, uniform in distribution and high in reaction activity is finally obtained.

Description

technical field [0001] The invention relates to the technical field of biomass pretreatment and comprehensive utilization of agricultural waste, in particular to a method for extracting low-molecular-weight lignin from walnut shells by fractional sedimentation of alkaline tetrahydrofurfuryl alcohol. Background technique [0002] The sustainable development of energy brought about by the gradual depletion of petrochemical resources and the environmental problems such as the greenhouse effect and air pollution caused by the use of petrochemical resources have shifted people's attention to renewable renewable energy that can achieve carbon neutrality and be used as chemical raw materials. Material resources, especially lignocellulose that does not compete with food crops, such as agricultural waste, including corn stalks, wheat stalks, cotton stalks, bagasse, etc., or plants that can grow in harsh environments, such as Miscanthus , switchgrass, etc. However, due to the complex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 徐建左宗涛王标李新龙耿繁辉张楷徐霞
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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