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A kind of process and device for preparing benzaldehyde by catalytic oxidation

A technology for catalytic oxidation and benzaldehyde, applied in the preparation of carbon-based compounds, organic compounds, molecular sieve catalysts, etc., can solve the problems of long reaction time of benzyl alcohol, achieve good hydrothermal stability, mild reaction, and improve efficiency Effect

Active Publication Date: 2020-06-30
WEIFANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the indirect electro-oxidation method has the characteristics of good selectivity and high yield, but the electrode material is a noble metal, or the reaction time of the medium to oxidize benzyl alcohol is too long. Therefore, it is very important to further explore and develop the clean production process of benzaldehyde with industrial application prospects. Significance

Method used

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  • A kind of process and device for preparing benzaldehyde by catalytic oxidation
  • A kind of process and device for preparing benzaldehyde by catalytic oxidation
  • A kind of process and device for preparing benzaldehyde by catalytic oxidation

Examples

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Effect test

Embodiment 1

[0032] A kind of technique that catalytic oxidation prepares benzaldehyde mainly comprises the following steps:

[0033] (1) Gas-phase pre-oxidation: use a steam generator to completely vaporize the benzyl alcohol liquid at 310°C to obtain vaporized benzyl alcohol; enter the vaporized benzyl alcohol into a pressurized tank and pressurize to 2.5Mpa to obtain pressurized vaporized benzyl alcohol; Vaporize benzyl alcohol with volume flow Am 3 / h flows into the vortex mixing device through the pipeline, and at the same time, the volume flow Bm 3 / h into the molecular oxygen, and with the volume flow rate Cm 3 / h into nitrogen as a protective gas, wherein, the volume flow Am of benzyl alcohol 3 The minimum value of / h is 9m 3 / h, the minimum flow rate is limited to ensure that the benzyl alcohol has a certain initial velocity before mixing, which is convenient for more thorough mixing during vortex mixing. The volume flow Am of benzyl alcohol 3 / h, the volume flow rate Bm of m...

Embodiment 2

[0044] A kind of technique that catalytic oxidation prepares benzaldehyde mainly comprises the following steps:

[0045] (1) Gas-phase pre-oxidation: use a steam generator to completely vaporize the benzyl alcohol liquid at 320°C to obtain vaporized benzyl alcohol; enter the vaporized benzyl alcohol into a pressurized tank and pressurize to 3Mpa to obtain pressurized vaporized benzyl alcohol; Pressurized vaporization of benzyl alcohol with volume flow Am 3 / h flows into the vortex mixing device through the pipeline, and at the same time, the volume flow Bm 3 / h into the molecular oxygen, and with the volume flow rate Cm 3 / h into nitrogen as a protective gas, wherein, the volume flow Am of benzyl alcohol 3 The minimum value of / h is 9m 3 / h, the minimum flow rate is limited to ensure that the benzyl alcohol has a certain initial velocity before mixing, which is convenient for more thorough mixing during vortex mixing. The volume flow Am of benzyl alcohol 3 / h, the volume ...

Embodiment 3

[0056] A kind of technique that catalytic oxidation prepares benzaldehyde mainly comprises the following steps:

[0057] (1) Gas-phase pre-oxidation: use a steam generator to completely vaporize the benzyl alcohol liquid at 380°C to obtain vaporized benzyl alcohol; enter the vaporized benzyl alcohol into a pressurized tank and pressurize to 4Mpa to obtain pressurized vaporized benzyl alcohol; Pressurized vaporization of benzyl alcohol with volume flow Am 3 / h flows into the vortex mixing device through the pipeline, and at the same time, the volume flow Bm 3 / h into the molecular oxygen, and with the volume flow rate Cm 3 / h into nitrogen as a protective gas, wherein, the volume flow Am of benzyl alcohol 3 The minimum value of / h is 9m 3 / h, the minimum flow rate is limited to ensure that the benzyl alcohol has a certain initial velocity before mixing, which is convenient for more thorough mixing during vortex mixing. The volume flow Am of benzyl alcohol 3 / h, the volume ...

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Abstract

The invention discloses a process and device for catalytic oxidation preparation of benzaldehyde, and belongs to the technical field of preparation of aldehydes; the process includes the steps: (1) gas phase pre-oxidation: completely vaporizing a benzyl alcohol liquid by a steam generator under the condition of the temperature of 310-380 DEG C, and then carrying out full mixing with molecular oxygen and nitrogen in an eddy-mixing device; (2) liquid phase photoelectrocatalytic oxidation: cooling mixed gas after pre-oxidation, allowing the mixed gas to enter a photoelectric reaction device witha photosensitive loaded catalyst and graphite as an anode, MnO2 as a cathode and an ultraviolet lamp as a light source, and carrying out a gradient reaction, to obtain a crude benzaldehyde liquid; and(3) benzaldehyde purification: carrying out centrifugation, standing, extraction, washing, drying, filtration and reduced pressure distillation of the crude benzaldehyde liquid, to obtain high-puritybenzaldehyde. The process has the advantages of short reaction time and high yield, and meets the requirements of green chemical development.

Description

technical field [0001] The invention belongs to the technical field of preparation of aldehydes, and in particular relates to a process and a device for preparing benzaldehyde by catalytic oxidation. Background technique [0002] Benzaldehyde is an important chemical raw material and an important intermediate in food additives, synthetic drugs and spices. Compared with benzoic acid, it has a higher market price. Due to the good chemical activity of the aldehyde group on the benzene ring, benzaldehyde products can undergo a series of unit reactions such as oxidation, reduction, and condensation to become important organic synthesis intermediates, and are widely used in fine chemicals such as medicine, pesticides, and plastic additives. Synthesis, widely used. The methods used for the preparation of benzaldehyde mainly include: benzyl chloride hydrolysis method, toluene oxidation method, benzyl alcohol oxidation method, aromatic acid or its ester reduction method, indirect el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/38C07C45/78B01J29/035
Inventor 逯纪涛刘楠徐小虎曾岳杨敏维魏梦娇
Owner WEIFANG UNIVERSITY
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