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Bubble tower oxidation reaction unit for producing terephthalic acid

A technology of terephthalic acid and oxidation reaction, which is applied in the fields of organic chemistry, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of unfavorable slurry flow and complex structure, and achieves simple structure, low construction cost and low operating cost. Effect

Inactive Publication Date: 2004-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal structure of the reactor is complicated, and it is easy to form local air pockets when a large amount of solvent evaporates, which is not conducive to the flow of gas and solid-containing slurry

Method used

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  • Bubble tower oxidation reaction unit for producing terephthalic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The medium and high temperature oxidation process is used to produce terephthalic acid. The annual production capacity of a single reaction device is 300,000 tons of TA, and the annual production time is 7600 hours. The reaction conditions are given in Table 1.1.

[0029]

[0030] The structural dimensions of the device are given in Table 1.2.

[0031] diameter (m)

[0032] In the table, D is the diameter of the tower, which is determined according to the production capacity, and H is the height of the reaction section. For a bubble column reactor with an annual output of 300,000 tons of terephthalic acid, when the aspect ratio is selected as 4, D = 4.60m. The reaction results and related indicators are given in Table 1.3.

[0033] PX conversion rate

[0034] PT and 4-CBA given in the table are respectively the liquid phase concentration (=component quality / solvent acetic acid and water quality) of reaction intermediate p-toluic acid and p-...

Embodiment 2

[0036] The high-temperature oxidation process is used to produce terephthalic acid. The annual production capacity of a single reaction device is still 300,000 tons of TA, and the annual production time is 7600 hours. The reaction conditions are given in Table 2.1. The structure and size of the reaction device are shown in Table 2.2, and the output results of the reactor are listed in Table 2.3.

[0037]

[0038] diameter (m)

[0039] PX conversion rate

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Abstract

The invention discloses a bubbling column oxidizing reaction device to produce p-phthalic acid, including a uniform straight-cylindrical bubbling column, where there are gas processing segment, free space segment and three phase reaction segment in turn form top to bottom in the bubbling column, there are liquid distributor and filling or liquor-holding board installed in the gas processing segment, there is a gas distributor installed at the bottom of the three phase reaction segment, there is a raw material feeding pipe set at 1 / 4-1 / 2 of the height of reaction segment, there is a discharge pipe set at the bottom of the bubbling column, there is a tail-gas pipe and a liquor condensate reflux pipe on the top of the bubbling column, the inlet of the condenser is linked with the tail-gas pipe, the gas outlet is linked with the follow-up tail-gas processing unit, the liquid outlet of the condenser is linked with raw material feeding pipe, liquor condensate reflux pipe and follow-up dehydration tower. It is applied to the process of preparing p-phthalic acid by high temperature oxidization.

Description

technical field [0001] The invention relates to a bubble column oxidation reaction device for producing terephthalic acid (TA), in particular to a device for air liquid-phase catalytic oxidation of p-xylene (PX) in the production process. Background technique [0002] Terephthalic acid is an important raw material for the production of polyester (PET) fibers and resins. At present, it is mainly produced by the p-xylene air oxidation method. Or tetrabromoethane) in the acetic acid solvent, pass into air or enriched oxygen to carry out oxidation, generate solid product terephthalic acid. The typical reaction temperature is 155-205°C, the pressure is 0.5-1.6MPa, 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. The resulting slurry is then obtained through subsequent separation and refining processes. Purified terephthalic acid (PTA) products. [0003] The ...

Claims

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Application Information

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IPC IPC(8): C07C51/265C07C63/26
Inventor 李希谢刚
Owner ZHEJIANG UNIV
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