Method for modifying enzymatic hydrolysis lignin by alkali activation

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: 2014-01-01
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem to be solved: In order to solve the problem of low reactivity 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for modifying enzymatic hydrolysis lignin by alkali activation
  • Method for modifying enzymatic hydrolysis lignin by alkali activation
  • Method for modifying enzymatic hydrolysis lignin by alkali activation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 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 h. After the reaction is completed, dilute with water and dilute hydrochloric acid (1.7 mol L -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%.

[0021]

Embodiment 2

[0023] Roberts et al. (2011) proposed that the reaction mechanism of hydrothermal alkali-catalyzed degradation of lignin is as follows:

[0024]

[0025] 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 3 h. After the reaction is completed, dilute with water and dilute hydrochloric acid (1.7 mol L -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%.

[0026] The enzymolysis lignin used is any one of biomass butanol lignin, biomass ethanol lignin and biomass lactat...

Embodiment 3

[0036] 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 h. After the reaction is completed, dilute with water and dilute hydrochloric acid (1.7 mol L -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%.

[0037]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for modifying enzymatic hydrolysis lignin by alkali activation. The method comprises the following steps: fully dissolving lignin in alkaline liquor according to mass ratio of enzymatic hydrolysis lignin to a base catalyst to distilled water of1.0:(0.1-2.0):(5.0-10.0); then, pouring the mixture into a hydrothermal reaction kettle; after reaction, adjusting the pH to 1.0 by HCl; and settling, filtering, washing and drying to obtain pure activated enzymatic hydrolysis lignin. According to the method provided by the invention, biomass-refined lignin, namely enzymatic hydrolysis lignin which is wide in source and low in price is selected as the raw material to carry out modification by alkaline activation on the lignin. More active functional groups such as phenolic hydroxyl groups are exposed for the activated lignin, so that the water solubility of the lignin is increased, and meanwhile, the molecular weight is reduced, thereby improving the reaction activity with formaldehyde and replacing phenol in a higher proportion. The method is significant for realizing development and utilization of the lignin which is 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 structural unit has an average of only 0.3 active sites that can react with formaldehyde, while phenol has 3 active sites that can reac...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap