Method for preparing extracting liquid containing vanillic aldehyde and syringaldehyde through catalytic oxygen decomposition of lignin

A technology for lignin and vanillin, which is applied in the field of catalytic oxygenolysis of lignin to prepare extracts containing vanillin and syringaldehyde, can solve the problems of harsh reaction conditions of strong acid and strong alkali, low yield of target products, corrosive environment of equipment and the like, Achieve the effect of low price, stable hydrothermal performance and easy oxidative depolymerization
CN109942391AActive Publication Date: 2019-06-28SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2019-06-28

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Abstract

The invention relates to a method for preparing extracting liquid containing vanillic aldehyde and syringaldehyde through catalytic oxygen decomposition of lignin. The method comprises the following steps: (1) preprocessing corn straw lignin in a NaHCO3 water solution; (2) putting the corn straw lignin preprocessed in the step (1) and a perovskite type catalyst into a closed reaction kettle, introducing O2 for reacting by taking an ethanol / water mixed solution as a solvent, after the reaction is finished, cooling the reaction liquid to the normal temperature, and carrying out discharging; and(3) sequentially carrying out filtration, rotary evaporation and ethyl acetate extraction on the discharged product in the step (2), so as to obtain the extracting liquid containing vanillic aldehydeand syringaldehyde. The method is mild in reaction condition and environment-friendly, the high-valued utilization of biomass can be realized, and the method has important significance to the protection of the ecological environment.
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Description

technical field

[0001] The invention relates to the technical field of lignin utilization, in particular to a method for preparing an extract containing vanillin and syringaldehyde by catalyzing oxygen decomposition of lignin. Background technique

[0002] With the depletion of fossil energy, it is imminent to find new renewable alternatives to fossil energy. Biomass energy reserves are huge, clean and harmless, and have great potential to replace fossil energy. Biomass is mainly divided into three categories: cellulose, hemicellulose, and lignin. Among them, although lignin has a complex structure and is amorphous, it is the only renewable source of benzene rings in nature. In my country, a huge amount of lignin is produced in the papermaking and wood hydrolysis industries. Due to the complex physical and chemical characteristics of lignin, about 95% of lignin cannot be used for high-value utilization, but is directly discharged into rivers, resulting in Huge environmental ...

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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