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
CN103483597BInactive Publication Date: 2016-01-13INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
Publication Date
2016-01-13
Estimated Expiration
Not applicable · inactive patent

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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.
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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

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
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