A kind of method utilizing sodium lignosulfonate to prepare aromatic aldehyde compound

A technology of sodium lignosulfonate and aromatic aldehydes, which is applied in the oxidation preparation of carbonyl compounds, the preparation of organic compounds, the separation/purification of carbonyl compounds, etc., which can solve the problems of harsh reaction conditions, high reaction temperature, and high cost, and achieve the goal of reaction The effect of mild conditions, simple process operation, and environmental protection in the preparation process
CN105037116BActive Publication Date: 2017-11-28SHANGHAI INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI INST OF TECH
Publication Date
2017-11-28

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Abstract

The invention discloses a method for preparing aromatic aldehyde compounds from sodium lignosulfonate, which comprises the following steps: adding sodium hydroxide into deionized water to obtain a sodium hydroxide water solution, adding sodium lignosulfonate, stirring uniformly, adding an oxidizer and a catalyst to react while keeping the temperature at 5-60 DEG C, regulating the pH value of the reaction solution to 1-3, carrying out vacuum filtration to remove the unreacted sodium lignosulfonate, extracting the obtained supernate with an organic solvent ethyl acetate or chloroform, and carrying out rotary evaporation concentration on the obtained organic phase at the controlled temperature of 30-55 DEG C, thereby obtaining an aromatic aldehyde mixture; and carrying out column chromatography separation on the obtained aromatic aldehyde mixture to respectively obtain vanillin, p-hydroxybenzaldehyde and syringaldehyde. The preparation method has the advantages of low preparation cost, simple technical operation, mild reaction conditions and no secondary pollution, reduces the pollution of papermaking wastewater on the environment, effectively utilizes the lignin resources, and obtains the high-added-value aromatic aldehyde compounds.
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Description

technical field

[0001] The invention relates to a method for preparing aromatic aldehyde compounds by using sodium lignosulfonate, belonging to the field of biomass chemical industry. Background technique

[0002] At present, the preparation of aromatic aldehyde compounds is based on petrochemical resources, using chemical methods to convert the existing groups on the benzene ring into aromatic aldehyde substances through a series of chemical reactions, or directly introducing aldehydes on the benzene ring through a series of chemical reactions. However, these methods often have high cost, poor reaction selectivity, strict requirements on reaction equipment, harsh reaction conditions, complicated process, and even harm to nature. Environmental pollution and other technical issues.

[0003] With the continuous development of social economy, the enhancement of people's awareness of environmental protection and the increasing scarcity of petrochemical resources, the renewable ...

Claims

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