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Preparation method of benzaldehyde

A technology of benzaldehyde and cinnamaldehyde, which is applied in the field of preparation of natural benzaldehyde to achieve the effects of high ozone utilization rate, good naturalness and good reaction rate

Active Publication Date: 2015-01-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although the method for preparing natural benzaldehyde by catalytic ozone selective oxidation of cinnamaldehyde or cinnamon oil has broad application prospects, there is still room for further improvement.

Method used

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  • Preparation method of benzaldehyde

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Experimental program
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Effect test

Embodiment 1

[0021] In the photocatalytic reactor, 10.0g of cinnamaldehyde (with a cinnamaldehyde content of more than 95%), 100.0g of anhydrous ethanol, 0.1g of TiO were respectively added 2 As a catalyst, ozone was introduced into the inner-illuminated photocatalytic reactor at a flow rate of 0.03g (ozone) / g (cinnamaldehyde) / h, and the ozonation reaction was carried out at -5°C for 0.5h to obtain crude benzaldehyde, which was heated at 80°C, Molecular distillation was carried out under the pressure of 160Pa to obtain 1.8 g of benzaldehyde product, and the yield of benzaldehyde was 22.4%.

Embodiment 2

[0023] In the photocatalytic reactor, 10.0g of cinnamaldehyde (with a cinnamaldehyde content of more than 95%), 60.0g of absolute ethanol and 0.2g of SnO were added respectively. 2 As a photocatalyst, ozone was introduced into the inner-illuminated photocatalytic reactor at a flow rate of 0.1 g (ozone) / g (cinnamaldehyde) / h, and the ozone cooperated with the photocatalytic reaction for 2 hours at 20 ° C to obtain crude benzaldehyde, at a temperature of 70 ° C. 2. Carry out molecular distillation under the pressure of 200Pa to obtain 3.5 g of benzaldehyde product, and the yield of benzaldehyde is 43.6%.

Embodiment 3

[0025] In the photocatalytic reactor, 10.0g of cinnamaldehyde (with a cinnamaldehyde content of more than 95%), 20.0g of anhydrous ethanol, and 0.3g of ZnO photocatalyst were added respectively, at a flow rate of 0.3g (ozone) / g (cinnamaldehyde) / h. Ozone was introduced into the inner-illuminated photocatalytic reactor, and the ozone cooperated with photocatalytic reaction for 3 hours at 5 °C to obtain crude benzaldehyde. Molecular distillation was carried out at a temperature of 50 °C and a pressure of 150Pa to obtain 4.7 g of benzaldehyde. The yield was 58.5%.

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Abstract

The invention discloses a preparation method of benzaldehyde. The method comprises the following steps: by taking cinnamyl aldehyde or cinnamyl oil as a raw material, adding 1.0-5.0% of one or more photocatalysts such as TiO2, ZnO, SnO2, Bi2O3, Y2O3 and the like; putting in an inner radiating photo-catalytic reactor; introducing 0.03-0.5g of ozone into per gram of cinnamyl aldehyde per hour at -5-20 DEG C for ozone synergized photo-catalytic reaction for 0.5-5 hours to obtain a coarse benzaldehyde product; and finally, obtaining benzaldehyde with relatively high purity by virtue of a molecular distilling device. The method disclosed by the invention is simple in process and green in reaction process, and the nature degree of benzaldehyde can be maintained. Moreover, the method is good in selectivity and high in benzaldehyde yield.

Description

technical field [0001] The invention belongs to the field of intensive and deep processing of agricultural and forestry chemical products, and particularly relates to a preparation method of natural benzaldehyde. Background technique [0002] With the improvement of living standards, people have higher and higher requirements for food safety, and are more inclined to use safer and healthier natural food additives. As an important food natural flavor, natural benzaldehyde is widely used in food, beverage, tobacco and cosmetics industries. Natural benzaldehyde has a special almond odor and exists in a large amount in essential oils such as cinnamon oil, bitter almond oil, and walnut oil. It is the second largest spice in the world in terms of quantity, with an annual demand of about 8,000t. At present, the demand for natural benzaldehyde is increasing day by day, and it is one of the commodities in short supply at home and abroad; at the same time, natural spices usually have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/54C07C45/40
CPCC07C45/40C07C45/82C07C47/54
Inventor 纪红兵秦祖赠
Owner SUN YAT SEN UNIV
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