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Method for extracting lignin from wood fiber cell walls

A technology of lignocellulose and lignin, which is applied in the fields of biomass basic chemistry and renewable resource utilization, can solve the problems of low yield, lignin quality loss, complicated process operation, etc., and achieves low boiling point, improved efficiency, and operational safety. high effect

Inactive Publication Date: 2016-01-20
SOUTH CHINA AGRI UNIV
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Problems solved by technology

And part of the lignin will be dissolved in the ionic liquid, and it is difficult to precipitate in acetone, resulting in the loss of lignin quality and low yield
[0007] 3. The whole process is complicated

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  • Method for extracting lignin from wood fiber cell walls

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the examples.

[0037] Get the air-dried lignocellulosic raw material in Table 1, pulverize, and get the lignocellulosic powder that has passed through a 40-mesh sieve.

[0038] The lignocellulosic powder is extracted with a benzene-ethanol solution with a volume ratio of 2:1, and the extract is dissolved in the benzene-ethanol solution. After the extraction is completed, the benzene-ethanol solution and the extract dissolved therein are discarded. A lignocellulosic powder without extractables is obtained.

[0039]Use a ball mill to mill the obtained wood fiber powder without extractables, and the milling time is shown in Table 1. Then, 10 g of lignocellulosic powder was dispersed in the extracting solution shown in Table 1 to obtain a suspension of lignocellulosic powder. The mass-volume ratio of lignocellulosic powder and extract is shown in Table 1.

[0040] Stir in a closed contai...

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Abstract

The invention discloses a method for extracting lignin from wood fiber cell walls. The method comprises the following steps: 1, crushing a wood fiber raw material, and extracting wood fiber powder by using a benzene-ethanol solution to obtain extract-free wood fiber powder; 2, carrying out ball milling on the obtained extract-free wood fiber powder for 8-12h through a ball mill, dispersing the ball milled powder in an extract liquid to obtain a suspension, stirring at normal temperature in a closed container for 24-36h, and filtering and separating, or centrifuging and separating to obtain wood fiber powder and a solution; and 3, carrying out rotary evaporation on the solution at a temperature being lower than 45DEG C through a rotary evaporator to obtain solid extract, and carrying out vacuum drying or freeze drying to obtain the lignin. The method reduces the temperature in the rotary evaporation process, reduces the lignin denaturation possibility, improves the rotary evaporation efficiency, reduces the production cost, and is of great scientific significance to identify the structure of wood fibers.

Description

technical field [0001] The invention belongs to the fields of biomass basic chemistry and renewable resource utilization, and in particular relates to a method for extracting lignin from lignocellulosic cell walls. Background technique [0002] Lignin is one of the three major components in plant cell walls, and is the second most abundant and important organic polymer in the plant kingdom after cellulose. Although the research on lignin has a history of more than 100 years, the structure of lignin in plant cell walls has not been fully elucidated due to the complexity of lignin itself and its cross-linking with other components in plant cell walls. In order to further understand the lignin structure in plant cell walls, how to separate lignin components that can represent natural structures from plant cell walls for structural characterization has always been a difficult problem for researchers. [0003] In the initial research, inorganic acid was generally used to treat r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 张爱萍谭晓华谢君
Owner SOUTH CHINA AGRI UNIV
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