Preparation method of natural benzaldehyde

A technology of benzaldehyde and natural cinnamic aldehyde, which is applied in the field of preparation of natural benzaldehyde, can solve the problems of high price, slow reaction speed, and low product quality, and achieve the effects of guaranteed quality, not easy polycondensation, and high reaction efficiency

Inactive Publication Date: 2007-02-14
SHANGHAI HUASHENG FLAVORING
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  • Abstract
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Problems solved by technology

Because cinnamaldehyde and alkaline substance generate the reaction of natural benzaldehyde is a kind of reversible reaction, therefore, along with the carrying out of reaction, in the reaction product, the content of natural benzaldehyde constantly improves, and reaction speed constantly reduces, and the natural benzene in the reaction product Due to the reaction balance, the formaldehyde content cannot be further increased, which affects the reaction yield and reaction efficiency
Because be used to prepare food, the perfume of household chemistry has certain requirement, natural cinnamic aldehyde usually derives from the essential oil of natural plant, as osmanthus oil, so price is very expensive, meanwhile, natural benzaldehyde also can condense, therefore, present The production method leads to the production cost of natural benzaldehyde cannot be reduced, and the product quality is not high

Method used

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  • Preparation method of natural benzaldehyde

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Effect test

Embodiment 1

[0018] 500 kilograms of weight concentration is that 2% sodium hydroxide aqueous solution is added in the reactor that top is provided with rectifying device, is heated to boiling, then 200 kilograms of cinnamic aldehydes are added reactor and react, generate natural benzaldehyde and acetaldehyde, and Through the rectification device, the natural benzaldehyde and acetaldehyde generated during the reaction process are continuously removed from the top of the rectification device by means of rectification, and part of the discharged natural benzaldehyde gas is condensed and refluxed, and part of it is sent as a product to the subsequent In the working section, the discharged acetaldehyde gas is collected for later use, and the reflux ratio of rectification is 2.5;

[0019] After reacting for 10 hours, 140 kg of natural benzaldehyde with a weight concentration of 95% was obtained, and the reaction yield was 83%.

Embodiment 2

[0021] 200 kilograms of weight concentration is that 5% sodium carbonate aqueous solution is added in the reactor that top is provided with rectifying device, is heated to boiling, then 80 kilograms of natural cinnamic aldehydes are added reactor and react, generate natural benzaldehyde and acetaldehyde, and Through the rectification device, the natural benzaldehyde and acetaldehyde generated during the reaction process are continuously removed from the top of the rectification device by means of rectification, and part of the discharged natural benzaldehyde gas is condensed and refluxed, and part of it is sent as a product to the subsequent In the working section, the discharged acetaldehyde gas is collected for later use, and the reflux ratio of rectification is 3;

[0022] After 12 hours of reaction, 54 kg of natural benzaldehyde with a weight concentration of 94% was obtained, and the reaction yield was 79%.

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Abstract

The natural benzaldehyde preparing process includes the following steps: the heated reaction between natural cinnamic aldehyde and water solution of alkaline matter in a reactor to produce natural benzaldehyde and acetaldehyde; rectification in a rectifier in the upper part of the reactor to produce gaseous natural benzaldehyde and acetaldehyde in the top of the rectifier; condensing the gaseous natural benzaldehyde and acetaldehyde; and conveying partial product to post section. The process has continuous elimination of the produced natural benzaldehyde and acetaldehyde, high material concentration, high reaction efficiency, low production cost and high product quality.

Description

technical field [0001] The invention relates to a preparation method of natural benzaldehyde. Background technique [0002] Natural benzaldehyde is an important fragrance, which is widely used in food and daily chemical industry. [0003] At present, natural benzaldehyde is prepared from cinnamaldehyde and alkaline solution by batch reaction. Because the reaction of cinnamaldehyde and alkaline substance to generate natural benzaldehyde is a kind of reversible reaction, therefore, along with the carrying out of reaction, in the reaction product, the content of natural benzaldehyde constantly improves, and reaction speed constantly reduces, and the natural benzene in the reaction product The formaldehyde content cannot be further improved due to the reason of reaction balance, which affects the reaction yield and reaction efficiency. Because be used to prepare food, the perfume of household chemistry has certain requirement, natural cinnamic aldehyde usually derives from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/228C07C45/00
Inventor 周文勇叶金大
Owner SHANGHAI HUASHENG FLAVORING
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