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A method for alkali-activated modified enzymatic lignin

A technology of enzymatic lignin and alkali activation, which is applied in the field of enzymatic lignin technology, can solve the problems of poor water solubility and low reactivity of enzymatic lignin, and achieve improved reactivity, convenient packaging and transportation, and easy commercialization Effect

Inactive Publication Date: 2016-01-13
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Technical problem to be solved: In order to solve the problem of low reaction activity of enzymatic lignin and poor water solubility, the present invention discloses an alkali-activated modified enzymatic lignin The method improves the water solubility of enzymatic lignin, increases the reactive sites of enzymatic lignin, and develops a new direction for the deep processing and utilization of biomass by-products, i.e. enzymatic lignin

Method used

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  • A method for alkali-activated modified enzymatic lignin
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  • A method for alkali-activated modified enzymatic lignin

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Effect test

Embodiment 1

[0017] Biomass ethanol lignin:sodium hydroxide:water (mass ratio) is 1:0.4:5. Stir the sodium hydroxide and water at room temperature for 10 minutes until they are homogeneous, add the biomass ethanol lignin into the above alkaline solution, and fully stir for 30 minutes. Pour it into a hydrothermal reaction kettle with an oil bath at 160°C and react for 7 hours. After the reaction is completed, dilute with water and dilute with dilute hydrochloric acid (1.7molL -1 ) to adjust the pH to 1.0, filter, wash with water several times until neutral, and dry at 50°C to constant weight to obtain pure activated lignin. The phenolic hydroxyl content is 3.87%, the alcoholic hydroxyl content is 3.15%, and the active sites increase by 41%.

Embodiment 2

[0019] Roberts et al. (2011) proposed that the reaction mechanism of hydrothermal alkali-catalyzed degradation of lignin is as follows:

[0020]

[0021] Biomass ethanol lignin:sodium hydroxide:water (mass ratio) is 1:0.4:15. Stir the sodium hydroxide and water at room temperature for 10 minutes until they are homogeneous, add the biomass ethanol lignin into the above alkaline solution, and fully stir for 30 minutes. Pour it into a hydrothermal reaction kettle with an oil bath at 180°C and react for 3h. After the reaction is completed, dilute with water and dilute with dilute hydrochloric acid (1.7molL -1 ) to adjust the pH to 1.0, filter, wash with water several times until neutral, and dry at 50°C to constant weight to obtain pure activated lignin. The phenolic hydroxyl content is 4.17%, and the alcoholic hydroxyl content is 3.15%. Active sites increased by 45%.

[0022] The enzymolysis lignin used is any one of biomass butanol lignin, biomass ethanol lignin and bioma...

Embodiment 3

[0030] Biomass butanol lignin: potassium hydroxide: water (mass ratio) is 1:1.12:10. Potassium hydroxide and water were stirred at room temperature for 10 minutes until homogeneous, biomass butanol lignin was added to the above alkaline solution, and fully stirred for 30 minutes. Pour it into a hydrothermal reaction kettle with an oil bath at 180°C and react for 3 hours. After the reaction is completed, dilute with water and dilute with dilute hydrochloric acid (1.7molL -1 ) to adjust the pH to 1.0, filter, wash with water several times until neutral, and dry at 50°C to constant weight to obtain pure activated lignin. The phenolic hydroxyl content is 4.98%, and the alcoholic hydroxyl content is 3.25%. Active sites increased by 51%.

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Abstract

A method for alkali-activated modified enzymatic lignin, according to the mass ratio of enzymatic lignin: alkali catalyst: distilled water is 1.0: (0.1-2.0): (5.0-10.0), lignin is completely dissolved in alkaline solution, and then pour it into a hydrothermal reaction kettle. After the reaction is completed, adjust the pH to 1.0 with HCl, precipitate, filter, wash and dry to obtain pure activated enzymatic lignin. The present invention selects biomass refined lignin with low price, i.e. enzymatic lignin, as a raw material, and performs alkali activation modification on it, and the activated lignin will expose more active functional groups such as phenolic hydroxyl groups, increasing its water solubility. sex. At the same time, the molecular weight is reduced, which is conducive to improving the reactivity with formaldehyde and replacing phenol with a higher proportion. It is of great significance to realize the development and utilization of lignin, a huge renewable resource.

Description

technical field [0001] The invention belongs to the technical field of enzymatic lignin hydrolysis technology, and in particular relates to an alkali-activated modified enzymatic lignin method. Background technique [0002] Lignin is a random high-branched natural high molecular polymer with a benzene ring structure. Composed of structural units, the main connection methods are α-O-4, β-O-4, β-β, β-5, β-1, 5-5, 4-O-5, etc., among which β-O-4 Ether linkage is the most important structural unit in lignin. The content of lignin in wood is 19~35%. The use of lignin instead of phenol to prepare phenolic resin has been reported in a large number of literatures, but the main problem is that the chemical activity and solubility of lignin are low, which limits the amount of lignin used. Zhao et al. (1994) proposed that each lignin phenylpropane C9 structure unit has an average of only 0.3 active sites that can react with formaldehyde, while phenol has 3 active sites that can react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
Inventor 储富祥刘晓欢王春鹏王基夫许玉芝南静娅
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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