Oxidizing device for producing aromatic carboxylic acid

An oxidation device, aromatic carboxylic acid technology, applied in carboxylate preparation, organic chemistry, chemical instruments and methods, etc., can solve the problems of large gas processing capacity and solvent evaporation, reduction of liquid foam entrainment, high superficial gas velocity, etc. , to achieve the effect of increasing gas-liquid contact efficiency, increasing plate efficiency, and simple tray structure

Inactive Publication Date: 2007-07-25
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

However, the diameter of the connection between the reaction section and the separation section shrinks sharply. Once the liquid level in the reaction section reaches the contraction section during operation, it is easy to form a liquid level surge, causing the separation section to flood and shut down.
Some reactors are equipped with an expansion section on the upper part to separate solid particles and liquid foam, but this scheme is difficult to work for the oxidation of alkyl aromatic hydrocarbons, because the process has a large amount of gas treatment and solvent evaporation, and the superficial gas velocity is extremely high (up to 0.4 ~ 1.0 m / s), it is difficult to effectively separate solid particles and reduce liquid foam entrainment by using the expansion section

Method used

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  • Oxidizing device for producing aromatic carboxylic acid
  • Oxidizing device for producing aromatic carboxylic acid

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Embodiment 1

[0024]The reaction section adopts a bubble column, and the gas separation section adopts multi-layer large-aperture sieve plates. Due to the large gas-liquid flow rate of the several layers of trays located in the lower part of the separation section, the plate spacing and opening ratio are 500mm and 15% respectively; The gas-liquid flow rate of several layers of trays located in the upper part of the separation section is small, so the plate spacing and opening ratio are reduced, which are 450mm and 11% respectively. The reaction conditions are listed in Table 1, the structural parameters of the reactor are listed in Table 2, the output indicators of the liquid phase of the reaction section are listed in Table 3, and the output indicators of the gas separation section are listed in Table 4.

[0025] Table 1 oxidation reaction conditions

[0026]

PX processing capacity

(ton / hour)

reaction pressure

Mpa (absolute pressure)

...

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Abstract

An oxidizing device for preparing aromatic carboxylic acid consists of a uniform straight cylindrical bubbling tower with gas separating section, spatial section and three-phase reacting section. The gas separating section has 5-6 layer liquid held tower board with down-flow tube, the three-phase reacting section consists of reacting slurry, gas distributor and charging and discharging tubing. It adopts structure with multi-layer liquid held tower board with down-flow tube and reactor of bubbling tower combination, and keeps bubbling level on tower board. Its advantages include low cost, high efficiency, wide operating range and high stability.

Description

technical field [0001] The invention relates to an oxidation device for producing aromatic carboxylic acid, in particular to a production device for producing terephthalic acid (TA) through air liquid-phase catalytic oxidation of p-xylene (PX). Background technique [0002] Polybasic aromatic carboxylic acid is the important raw material of producing polyester (PET) fiber and resin, mainly adopts alkyl aromatic hydrocarbon air oxidation method to produce at present, and this method dissolves raw material alkyl aromatic hydrocarbon in containing catalyst cobalt acetate, manganese acetate, hydrogen bromide ( Or tetrabromoethane) in the acetic acid solvent, pass into air or enriched oxygen to carry out oxidation, generate solid product aromatic carboxylic acid. The typical reaction temperature is 120-225°C, the pressure is 0.1-2MPa, and the residence time is 40-120min. The reaction heat is removed by solvent evaporation, and the steam is condensed and returned to the reactor. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/265C07C63/26
Inventor 李希王丽军陈斌王丽雅
Owner ZHEJIANG UNIV
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