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A kind of reaction device and method for preparing benzoic acid and benzaldehyde by direct oxidation of toluene

A reaction device and technology of benzaldehyde, applied in the field of chemical synthesis of benzoic acid and benzaldehyde, can solve the problems of prolonging the reaction time of toluene oxidation, low selectivity and yield of benzaldehyde, difficult controllability of toluene, etc., and achieve structural Simple, increased contact time, increased mass transfer effect

Inactive Publication Date: 2017-10-27
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 1. The reactors for the production of benzoic acid are mainly bubbling reactors, in which the backmixing of the reaction liquid in the bubbling reactor is very serious, and it is difficult to realize the controllability of the toluene oxidation reaction process, so that the reaction intermediate product benzaldehyde low selectivity and yield
[0006] 2. The reaction of toluene liquid-phase oxidation to prepare benzoic acid and benzaldehyde is a strong exothermic reaction, and the heat of reaction needs to be removed in time during the reaction process. However, a heat exchange device is added on the bubble reactor, resulting in a complicated structure. Heat transfer efficiency is low
If there is a problem with the heat exchange structure, the work needs to be shut down, and the complex heat exchange structure will bring great inconvenience to maintenance
[0007] 3. Bubble reactor is through the air or high concentration O 2 It is passed into the reactor in the form of bubbling to undergo oxidation reaction with liquid phase toluene, and the mass transfer rate has a great influence on the speed of the gas-liquid phase reaction, while the mass transfer efficiency of the bubbling reactor is low, which prolongs the oxidation reaction of toluene. reaction time

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  • A kind of reaction device and method for preparing benzoic acid and benzaldehyde by direct oxidation of toluene
  • A kind of reaction device and method for preparing benzoic acid and benzaldehyde by direct oxidation of toluene

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Embodiment 1

[0039] Embodiment 1 of the present invention provides a tubular reaction device and method for preparing benzoic acid and benzaldehyde by direct oxidation of toluene, for the preparation of benzoic acid and benzaldehyde, please refer to figure 2 As shown, the method includes:

[0040] (1) A tubular reaction device for preparing benzoic acid and benzaldehyde by direct oxidation of toluene, the device includes 15 tubular reaction sleeves, the height of the reaction sleeve is 15m, and the inner diameter of the reaction sleeve is 200mm.

[0041] (2) Start the material and gas delivery system, raw material preheating and high-temperature heat transfer oil circulation system: open the gas mass flow meter 19, and pass protective gas N into the system 2 To the system pressure is 0.7MPa; open the liquid phase material delivery pump 15, and transport the toluene reaction raw material solution 28 that is 0.01wt% benzaldehyde relative to the mass fraction of toluene in the toluene prehea...

Embodiment 2

[0049] Embodiment 2 of the present invention provides a tubular reaction device and method for the direct oxidation of toluene to prepare benzoic acid and benzaldehyde, for the preparation of benzoic acid and benzaldehyde, please refer to figure 2 As shown, the method includes:

[0050] (1) A tubular reaction device for preparing benzoic acid and benzaldehyde by direct oxidation of toluene, the device includes 18 tubular reaction sleeves, the height of the reaction sleeve is 11 m, and the inner diameter of the reaction sleeve is 180 mm.

[0051] (2) Start the material and gas delivery system, raw material preheating and high-temperature heat transfer oil circulation system: open the gas mass flow meter 19, and pass protective gas N into the system 2 To the system pressure is 0.7MPa; open the liquid phase material delivery pump 15, and transport the toluene reaction raw material solution 28 that is 0.02wt% benzaldehyde relative to the toluene mass fraction in the toluene prehe...

Embodiment 3

[0059] Embodiment 3 of the present invention provides a tubular reaction device and method for preparing benzoic acid and benzaldehyde by direct oxidation of toluene, for the preparation of benzoic acid and benzaldehyde, please refer to figure 2 As shown, the method includes:

[0060] (1) A tubular reaction device for preparing benzoic acid and benzaldehyde by direct oxidation of toluene, the device includes 13 tubular reaction sleeves, the height of the reaction sleeve is 12m, and the inner diameter of the reaction sleeve is 230mm.

[0061] (2) Start the material and gas delivery system, raw material preheating and high-temperature heat transfer oil circulation system: open the gas mass flow meter 19, and pass protective gas N into the system 2 To the system pressure is 0.7MPa; open the liquid phase material delivery pump 15, and transport the toluene reaction raw material solution 28 that is 0.03wt% benzaldehyde relative to the toluene mass fraction in the toluene preheatin...

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Abstract

The invention discloses a reaction device and method for preparing benzoic acid and benzaldehyde through direct oxidation of methylbenzene. The reaction device is characterized in that the device adopts a tubular reactor form and is composed of multiple vertically arranged sleeve type reactors; the sleeve type reactors are connected end to end through gas-liquid down pipes which are relatively small in diameter; a static mixer mixing unit structure is arranged in each reaction tube sleeve; thermal conductive oil under the reaction temperature of methylbenzeneoxidation fills the space between everytwo reactive tube sleeves. According to the reaction system, the controllability of the methylbenzene oxidation process is improved, so as to adjust the yield of intermediateoxidation product benzaldehyde; meanwhile, the reaction system has the characteristic of simple structure and high heat exchange efficiency.

Description

technical field [0001] The invention relates to a chemical synthesis method of benzoic acid and benzaldehyde, in particular to a reaction device for preparing benzoic acid and benzaldehyde by continuous oxidation reaction of toluene. Background technique [0002] Benzoic acid is an important raw material for organic synthesis, mainly used as a food preservative, an alkyd resin improver, and can also be used in pharmaceuticals, dye intermediates, plasticizers, raw materials for spices, fiber intermediates and other fields; benzaldehyde is It is a very widely used aromatic aldehyde raw material in the chemical industry, and is widely used in spices, medicine, dyes, pesticides and other fields. The methods currently used in industry to prepare benzoic acid and benzaldehyde include trichlorotoluene hydrolysis, phthalic anhydride decarboxylation, benzyl halide oxidation and liquid-phase air oxidation. However, the main application aspects of benzoic acid and benzaldehyde require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/00C07C45/36C07C47/54C07C51/235C07C63/06
Inventor 胡永琪崔继超赵途张连宇孙涛略赵风云张向京
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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