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Device and method for preparing benzaldehyde in impinging flow rotating packed bed

A technology of rotating packed bed and impingement flow, applied in feeding device, preparation of carbon-based compounds, chemical instruments and methods, etc., can solve the problems of low product quality of benzaldehyde, less by-products, harsh reaction conditions, etc. Effects of enhanced mixing and mass transfer processes, faster reaction rates, and simple operation

Active Publication Date: 2021-05-18
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of severe reaction conditions, many synthesis steps, low yield, high energy consumption cost and low quality of benzaldehyde products in the prior synthesis of benzaldehyde compounds, the present invention provides an impinging flow rotating packed bed for preparing benzene A device and method for formaldehyde, the preparation method does not require a catalyst, and has the advantages of simple process, high yield and few by-products

Method used

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  • Device and method for preparing benzaldehyde in impinging flow rotating packed bed
  • Device and method for preparing benzaldehyde in impinging flow rotating packed bed
  • Device and method for preparing benzaldehyde in impinging flow rotating packed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 5.41 g (0.05 mol) benzyl alcohol and dissolve it in 500 mL ethyl acetate to the liquid storage tank I in sequence, dilute the sodium hypochlorite solution (0.05 mol) to 500 mL and place it in the liquid storage tank III, set the rotational speed of the rotating packed bed to 300 rpm, Flow rate is 100L / h, open valve Ⅰ and valve Ⅳ, close valve Ⅱ and valve Ⅲ, turn on pump Ⅰ and pump Ⅳ, turn off pump Ⅱ and pump Ⅲ, when the reaction liquid in storage tank Ⅰ and storage tank Ⅲ passes through the impact flow When the rotating packed bed completely flows into the liquid storage tank II, immediately close the pump I and pump IV and the valve I and valve IV, open the valve II and valve III as well as the pump II and pump III at the same time, and start the mechanical agitation of the liquid storage tank II, The two streams of reaction materials passed through the impinging flow rotating packing bed again, and the reaction liquid was passed into the liquid storage tank II, and ...

Embodiment 2

[0026] Add 5.41 g (0.05 mol) benzyl alcohol and dissolve it in 500 mL ethyl acetate to the liquid storage tank I in sequence, dilute the sodium hypochlorite solution (0.15 mol) to 500 mL and place it in the liquid storage tank III, set the rotating packing bed speed to 500 rpm, Flow rate is 100L / h, open valve Ⅰ and valve Ⅳ, close valve Ⅱ and valve Ⅲ, turn on pump Ⅰ and pump Ⅳ, turn off pump Ⅱ and pump Ⅲ, when the reaction liquid in storage tank Ⅰ and storage tank Ⅲ passes through the impact flow When the rotating packed bed completely flows into the liquid storage tank II, immediately close the pump I and pump IV and the valve I and valve IV, open the valve II and valve III as well as the pump II and pump III at the same time, and start the mechanical agitation of the liquid storage tank II, The two streams of reaction materials passed through the impinging flow rotating packing bed again, and the reaction liquid was passed into the liquid storage tank II, and the reaction liqu...

Embodiment 3

[0029]Add 5.41 g (0.05 mol) of benzyl alcohol and dissolve it in 500 mL of ethyl acetate to the liquid storage tank I in sequence, dilute the sodium hypochlorite solution (0.25 mol) to 500 mL and place it in the liquid storage tank III, set the rotating packing bed speed to 800 rpm, Flow rate is 100L / h, open valve Ⅰ and valve Ⅳ, close valve Ⅱ and valve Ⅲ, turn on pump Ⅰ and pump Ⅳ, turn off pump Ⅱ and pump Ⅲ, when the reaction liquid in storage tank Ⅰ and storage tank Ⅲ passes through the impact flow When the rotating packed bed completely flows into the liquid storage tank II, immediately close the pump I and pump IV and the valve I and valve IV, open the valve II and valve III as well as the pump II and pump III at the same time, and start the mechanical agitation of the liquid storage tank II, The two streams of reaction materials passed through the impinging flow rotating packed bed again, and the reaction liquid was passed into the liquid storage tank II, and the reaction ...

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Abstract

A device and method for preparing benzaldehyde in an impinging flow rotating packed bed belongs to the technical field of fine chemicals, and can solve the existing problems of severe reaction conditions, many synthesis steps, low yield and high energy consumption cost in the synthesis of benzaldehyde compounds , The problem of low quality benzaldehyde products, including impinging flow rotating packed bed, liquid storage tank I, liquid storing tank II and liquid storing tank III with stirring rods, using impinging flow-rotating packed bed to perform severe shearing of fluid and broken to produce a huge and rapidly updated phase interface, which greatly strengthens the microscopic mixing and mass transfer process and speeds up the reaction rate. The invention has the advantages of simple operation, high yield, mild reaction conditions and easy industrialization.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a device and a method for preparing benzaldehyde in an impinging flow rotating packed bed. Background technique [0002] Benzaldehyde compounds are important organic synthesis intermediates and fine chemical products, widely used in medicine, dyes, spices, resins and other industries. At present, the methods for synthesizing benzaldehyde compounds mainly include benzyl chloride hydrolysis method and toluene liquid-phase air oxidation method. These two methods have disadvantages such as harsh reaction conditions, low yield, and many by-products. [0003] There are many deficiencies in the traditional method for synthesizing benzaldehyde. In recent years, many scholars have reported the research on the synthesis of benzaldehyde by oxidation of benzyl alcohol. This method has the advantages of simple process, environmental friendliness, good quality of benzaldehy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/18B01J19/00B01J4/02B01J4/00C07C45/30C07C47/54
CPCB01J4/002B01J4/02B01J19/0006B01J19/0053B01J19/18C07C45/30C07C47/54
Inventor 刘有智焦纬洲高文强李鹏阳
Owner ZHONGBEI UNIV
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