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A kind of refining method of lignin

A refining method and lignin technology, applied in the field of comprehensive utilization of biomass, can solve the problems of inability to obtain pure lignin products, high equipment requirements, long dissolution time, etc., and achieve the effects of low cost, high economic value and abundant sources

Inactive Publication Date: 2016-01-20
NORTHEAST FORESTRY UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the existing liquefaction method cannot obtain pure lignin products, and that there are high equipment requirements, long dissolution time and low yield in the process of dissolving and separating lignin by inorganic alkaline solution or organic solvent. A method for refining lignin is provided

Method used

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  • A kind of refining method of lignin
  • A kind of refining method of lignin

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specific Embodiment approach 1

[0016] Specific embodiment 1: Add enzymatic lignin raw material and liquefaction reagent furfuryl alcohol into the reactor at a mass ratio of 1:3, liquefy and dissolve at 120°C for 15 minutes, cool to 25°C after liquefaction, then filter to remove the residue, and put The filtrate is distilled to recover the solvent to obtain refined lignin.

[0017] The lignin yield obtained in this embodiment is 43%, which shows that the lignin refining method has high efficiency.

specific Embodiment approach 2

[0018] Specific embodiment two: Add enzymatic lignin raw material and liquefaction reagent furfuryl alcohol into the reactor at a mass ratio of 1:5, liquefy and dissolve at 140°C for 30 minutes, cool to 80°C after liquefaction, then filter to remove the residue, and put The filtrate is distilled to recover the solvent to obtain refined lignin.

[0019] The yield of lignin obtained in this embodiment is 48%, which shows that the lignin preparation method has high efficiency.

specific Embodiment approach 3

[0020] Specific embodiment three: Add the enzymatic lignin raw material and liquefaction reagent furfuryl alcohol into the reactor at a mass ratio of 1:4, liquefy and dissolve at 170°C for 90 minutes, cool to 20°C after liquefaction, then filter to remove the residue, and put The filtrate is distilled to recover the solvent to obtain refined lignin.

[0021] The yield of lignin obtained in this embodiment is 49%, which shows that the lignin preparation method has high efficiency.

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Abstract

The invention especially relates to a refining method for lignin, which belongs to the field of comprehensive utilization of biomass. The refining method provided by the invention overcomes the problem that pure lignin cannot be obtained by using a conventional liquefaction method and the problems of high requirements for equipment, long dissolving time and low yield in the processes of dissolution and separation of lignin by using an inorganic alkaline solution or organic solvent. The refining method comprises the following steps: mixing a lignin raw material with a liquefaction reagent; carrying out heating and liquefaction; carrying out cooling after liquefaction; carrying out filtering to remove residue; and distilling a filtrate to recover a solvent so as to obtain refined lignin. According to the invention, the method has the characteristics of high effectiveness and high selectivity; the refined lignin has high purity, and yield of the refined lignin reaches 43 to 60%; the refining method is simple and is beneficial for industrial utilization of lignin; the refined lignin can be used for preparation of hydrocarbon fuels, biological matrix adhesives, polyurethane materials, etc., has high economic values and enables reutilization of fuel ethanol and waste and residue produced in papermaking to be realized, environmental pollution to be reduced and industrial economic benefits to be increased.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of biomass, in particular to a method for refining lignin. Background technique [0002] With the deepening of human understanding of environmental pollution and resource crisis, the renewable and degradable properties of natural polymers have attracted increasing attention, and the comprehensive and efficient utilization of lignin has also attracted people's attention. Lignin is the only non-petroleum resource that can provide renewable aryl compounds in nature, but because lignin is a macromolecular substance with a three-dimensional structure, and the active phenolic structure is easy to change during the preparation process (such as: acidic conditions prone to condensation under alkaline conditions, prone to oxidation under alkaline conditions, etc.), the current utilization rate is still relatively low. Liquefying and refining lignin to obtain high-purity small-molecule phenolic subs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
Inventor 李淑君郭国万方桂珍任世学马艳丽
Owner NORTHEAST FORESTRY UNIVERSITY
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