Catalytic synthesizing method of benzaldehyde

A synthesis method and technology of benzaldehyde, which are applied in chemical instruments and methods, oxidation preparation of carbonyl compounds, catalysts for physical/chemical processes, etc., can solve the problems of difficult post-processing of the reaction system, difficult separation of catalysts and products, and environmental pollution by organic solvents. , to achieve the effect of improving economic and social benefits, low production cost and short response time

Inactive Publication Date: 2009-10-07
HARBIN NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing method for synthesizing benzaldehyde is difficult to separate the catalyst from the product, the post-treatment of t

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  • Catalytic synthesizing method of benzaldehyde

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specific Embodiment approach 1

[0007] Specific embodiment one: the catalytic synthesis method of benzaldehyde in the present embodiment is realized according to the following steps: one, 3.5 ~ 13mL of benzyl alcohol, ethanol, propanol, butanol, amyl alcohol, isoamyl alcohol or isobutanol are added to three Neck flask, then add 0.1-0.5g of catalyst to obtain mixture A; 2. Heat mixture A from room temperature to 80-120°C, then gradually drop hydrogen peroxide with a mass fraction of 30% and a volume of 20-30mL Add it to mixture A and stir for 4-8 hours, so that the molar ratio of hydrogen peroxide to benzyl alcohol is 1.5-8.5:1 to obtain mixture B; 3. Add 30-50 mL of benzene to mixture B to extract and separate the layers, discard The upper layer was removed, and then the liquid phase in the lower layer was distilled by rotary evaporation, and the solid phase was then washed once with 20 mL of benzene, 20 mL of water and 50 mL of ethyl acetate, and then filtered and dried to obtain benzene Formaldehyde; where...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the amount of benzyl alcohol, ethanol, propanol, butanol, amyl alcohol, isoamyl alcohol or isobutanol in step 1 is 4.5-12 mL. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0012] Embodiment 3: This embodiment differs from Embodiment 1 in that the amount of benzyl alcohol, ethanol, propanol, butanol, amyl alcohol, isoamyl alcohol or isobutanol in step 1 is 5.5-10 mL. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The present invention relates to a catalytic synthesizing method of benzaldehyde. The method of the invention settles the problems of hard separation of catalyst from product, difficult after-treatment of reaction system, low catalytic activity and environment pollution caused by the organic solvent required by the reaction, which exist in the prior method for synthesizing benzaldehyde. The method comprises the following steps: 1. preparing a compound A; 2. preparing a compound B; and 3. adding benzene into the compound B for executing extractive reaction, separating the upper layer and executing rotary steaming to the lower layer, then washing, filtering and drying for obtaining the benzaldehyde. The method of the invention has the advantages of easy separation of catalyst from product, easy after-treatment of reaction system, high catalytic activity, no requirement of organic solvent in reaction process, energy saving and no environment pollution.

Description

technical field [0001] The invention relates to a catalytic synthesis method of benzaldehyde. Background technique [0002] Benzaldehyde (commonly known as bitter almond oil) is the most simple and industrially important aromatic aldehyde, which is mainly used as an intermediate or raw material for the manufacture of dyes, medicines, spices, seasonings and pesticides. The traditional production method of benzaldehyde has the problem that the produced benzaldehyde often contains traces of halide ions and has low selectivity. In order to overcome the shortcomings of the traditional method, people have gradually replaced the traditional method with the liquid-phase catalytic oxidation method (homogeneous catalytic method and heterogeneous catalytic method) of hydrogen peroxide, but in the liquid-phase catalytic oxidation process, although homogeneous catalytic oxidation has Good activity, but there are disadvantages of difficult separation of catalyst and product, and difficul...

Claims

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Application Information

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IPC IPC(8): C07C47/54C07C45/29B01J31/02
Inventor 蔡清海于媛媛路嫔
Owner HARBIN NORMAL UNIVERSITY
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