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A method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass

A technology for wood fiber and biomass, which is applied in the field of preparing high yield and high aryl ether bond structure lignin, can solve the problems of low aryl ether bond content and high carbon-carbon bond content, and achieves low aryl ether bond and carbon-carbon bond. The effect of high carbon bond content and low cost

Active Publication Date: 2022-03-04
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these delignification methods selectively break the C-O bond in the lignin, fragment the lignin, separate and dissolve the lignin in the lignocellulosic raw material through the process of solution dissolution, and the obtained lignin also exists The phenomenon that the aryl ether bond content is not high and the carbon-carbon bond content is high

Method used

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  • A method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass
  • A method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass
  • A method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass

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Embodiment 1

[0036] A method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass, comprising the steps of:

[0037] 1) Pretreatment: remove impurities from the balsa raw material, crush it to a fineness of 20-60 mesh, and dry it to obtain the lignocellulosic biomass raw material for subsequent use;

[0038] 2) Ball milling: the lignocellulose raw material obtained in step 1) was ball milled at 450 rpm for 2 hours, and set aside;

[0039] 3) Homogenization: Homogenize the pulverized raw materials obtained in step 2) in a homogenizer, control the operating pressure to 150MPa, the homogeneous injection concentration is 2.5%, and the homogenization times are 10 times, and the obtained samples are used for future use ;

[0040]4) Enzymolysis: Add the raw material obtained in step 3) to sodium acetate buffer solution with a pH of 4.8, then add 35 FPU cellulase / gram substrate, and perform enzymolysis at 50° C. for 48 hours.

[0041] 5) Separation...

Embodiment 2

[0044] A method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass, comprising the steps of:

[0045] 1) Pretreatment: removing impurities from the parenchyma cell raw material of moso bamboo, crushing to a fineness of 20-60 mesh, and drying to obtain the lignocellulosic biomass raw material, which is set aside;

[0046] 2) Ball milling: the lignocellulose raw material obtained in step 1) was ball milled at 400 rpm for 2.5 hours, and set aside;

[0047] 3) Homogenization: the pulverized raw material obtained in step 2) is homogenized in a homogenizer, the control operating pressure is 130MPa, the homogeneous injection concentration is 1.5%, the number of homogenization times is 8 times, and the obtained sample is used for future use ;

[0048] 4) Enzymolysis: Add the raw material obtained in step 3) to sodium acetate buffer solution with a pH of 5.0, then add 30 FPU cellulase / gram substrate, and perform enzymolysis at 45-55° C...

Embodiment 3

[0052] A method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass, comprising the steps of:

[0053] 1) Pretreatment: removing impurities from the Manila hemp raw material, crushing to a fineness of 100-150 mesh, and drying to obtain the lignocellulosic biomass raw material for subsequent use;

[0054] 2) Ball milling: the lignocellulose raw material obtained in step 1) was ball milled at 500 rpm for 3.5 hours, and set aside;

[0055] 3) Homogenization: Homogenize the pulverized raw materials obtained in step 2) in a homogenizer, control the operating pressure to 140 MPa, the homogeneous injection concentration is 1%, and the homogenization times are 10 times, and the obtained samples are used for later use;

[0056] 4) Enzymolysis: Add the raw material obtained in step 3) to sodium acetate buffer solution with a pH of 5.5, then add 50 FPU cellulase / gram substrate, and perform enzymolysis at 45° C. for 72 hours.

[0057] 5) S...

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Abstract

The invention discloses a method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass, and belongs to the technical field of value-added transformation and utilization of lignin resources. The method includes the steps of crushing pretreatment, ball milling, homogenization, enzymolysis, separation and washing, etc., and the yield of obtained lignin is more than 95%, and the relative proportion of lignin containing aryl ether bonds is more than or equal to 90%. Aiming at the current situation that the carbon-carbon bond content in the lignin obtained by the existing extraction method is high, the lignin carbon-carbon bond ratio obtained by the present invention is low, the preparation method is simple and efficient, time-consuming, simple to operate, and low in cost, and has good promotion Potential and industrial value.

Description

technical field [0001] The invention belongs to the technical field of value-added transformation and utilization of lignin resources, and in particular relates to a method for preparing lignin with high yield and high aryl ether bond structure from lignocellulosic biomass. Background technique [0002] Lignin is a natural aromatic ring polymer mainly composed of syringyl (S) units, guaiacyl (G) units and p-hydroxyphenyl (H) units. In addition, the lignin structure also contains other precursor structures, such as p-hydroxybenzoic acid, p-coumaric acid, ferulic acid, etc. In wood fiber, natural lignin is mainly polymerized by the above monomers in the form of aryl ether bonds (β-O-4) and a small amount of carbon-carbon bonds (β-5, β-β, etc.). Macromolecular lignin polymers are formed. As the only aromatic ring resource in lignocellulosic fibers, lignin has extremely high utilization value. [0003] However, as the largest industry currently utilizing lignocellulosic fiber...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 文甲龙马成业袁同琦曹学飞张琛徐玲花高雪高宇非王汉敏
Owner BEIJING FORESTRY UNIVERSITY
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