Preparation method of benzaldehyde

A technology of benzaldehyde and cinnamaldehyde, which is applied in the field of benzaldehyde preparation, can solve the problems of harsh reaction conditions and extremely high equipment requirements, and achieve the effects of simple equipment, reduced production costs, and fast reaction

Inactive Publication Date: 2007-09-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the required reaction conditions are harsh (high temperature and high pressure), the temperature is between 200-350°C, and the pressure is between 3-20MPa, which requires extremely high equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 25mL 2% NaOH aqueous solution and 1mmol β-cyclodextrin into a 100mL flask respectively, stir at 30°C until the β-cyclodextrin dissolves, then add 2mmol cinnamaldehyde, and extract with 50mL ethyl acetate after reacting for 25h, the obtained acetic acid The ethyl ester phase was concentrated under reduced pressure to remove ethyl acetate to obtain benzaldehyde with a yield of 22%.

Embodiment 2

[0024] Add 25mL 2% NaOH aqueous solution and 1mmol β-cyclodextrin to a 100mL three-neck flask respectively, stir at 50°C until the β-cyclodextrin dissolves, then add 2mmol cinnamaldehyde, and extract with 50mL ethyl acetate after reacting for 18h. The ethyl acetate phase was concentrated under reduced pressure to remove ethyl acetate to obtain benzaldehyde with a yield of 42%.

Embodiment 3

[0026] Add 25mL 2% NaOH aqueous solution and 1mmol β-cyclodextrin to a 100mL three-neck flask respectively, stir at 90°C until the β-cyclodextrin dissolves, then add 2mmol cinnamaldehyde, react for 4h and extract with 50mL butyl acetate, the obtained The butyl acetate phase was concentrated under reduced pressure to remove the butyl acetate to obtain benzaldehyde with a yield of 27%.

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Abstract

The invention discloses a method for producing the phenyl aldehyde. The method has the benzalacet aldehyde as material, the beta-cyclodextrin as accelerant, the buck as solvent which is formed by one or more admixture including sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, ethanolamine, diethanolamine, triethanolamine and triethylamine for 1-60 hours. Then the phenyl aldehyde is obtained in two steps: firstly extracting having the ester solvent, carbinol, acetone or acetonitrile as organic solvent, secondly decompressing and concentrating. The invention has a simple art, low energy consuming, low cost, low/non pollution, high yield, high purity of phenyl aldehyde, easy separation of the beta-cyclodextrin and recycled application.

Description

technical field [0001] The present invention relates to a kind of preparation method of benzaldehyde. Background technique [0002] Natural benzaldehyde as a food spice has been widely used in food, health care products, pharmaceuticals and other industries. The natural benzaldehyde used in food flavors and flavors in the world has reached 500 tons every year, and its annual demand is still increasing. The traditional production method of natural benzaldehyde is to use amygdalin-containing nuts as raw materials, through fermentation, hydrolysis, alkali washing and other processes; but the highly toxic by-product produced in the hydrolysis process - hydrocyanic acid must be removed, resulting in process Complex and costly. [0003] my country is rich in cinnamon oil resources, and the use of cinnamon oil to produce natural benzaldehyde has received widespread attention. The methods that have been reported so far mainly include the following: [0004] Yi Fengping etc. have r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/54C07C45/67C07C45/54
Inventor 纪红兵陈鸿雁裴丽霞
Owner SOUTH CHINA UNIV OF TECH
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