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Double bubble column reaction device used for oxidizing p-xylene and reaction process

A reaction device, para-xylene technology, applied in chemical/physical/physical-chemical stationary reactors, preparation of organic compounds, chemical methods for reacting liquid and gaseous media, etc., can solve unfavorable gas and solid-containing slurry It can solve the problems of mixing and flowing of materials, complex structure, etc., so as to improve the comprehensive reaction rate, improve the conversion rate and TA yield, and reduce the investment cost and operating cost.

Inactive Publication Date: 2019-06-11
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, which is not conducive to the mixing and flow of gas and solid-containing slurry

Method used

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  • Double bubble column reaction device used for oxidizing p-xylene and reaction process
  • Double bubble column reaction device used for oxidizing p-xylene and reaction process
  • Double bubble column reaction device used for oxidizing p-xylene and reaction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, a traditional stirred tank reactor is used to produce terephthalic acid, and the reacted slurry and air continue to react in the first crystallizer. The designed production capacity is 600,000 tons / year, and the annual production time is 8000 Hourly calculation. The specific operating parameters of the reactor and the first crystallizer in this process are given in Table 1, and the operating results of the reactor in this embodiment are shown in Table 2.

[0043] Table 1 Operating parameters of the stirred tank oxidation reactor

[0044]

[0045] Table 2 Operation results of the stirred tank oxidation reactor

[0046]

[0047] Note: 1. The PX conversion rate and TA yield of the first crystallizer refer to the total conversion rate and yield;

[0048] 2. O in exhaust gas 2 , CO 2 and CO concentration refer to the volume fraction of each component in the non-condensable component.

Embodiment 2

[0050] In this example, the double bubble column oxidation reactor proposed by the patent of the present invention is used to produce terephthalic acid, wherein the second reactor is an air-lift internal circulation bubble column reactor with a built-in draft tube. The designed production capacity is 600,000 tons / year, and the annual production time is calculated as 8,000 hours. The specific operating parameters of the two bubble column reactors are given in Table 3, and the structural parameters of the two reactors are given in Table 4.

[0051] Table 3 Operating parameters of double bubble column oxidation reactor

[0052]

[0053]

[0054] Table 4 Structural parameters of double bubble column oxidation reactor

[0055] Structural parameters

diameter

high

aspect ratio

Guide tube diameter

Guide tube height

Effective volume

unit

m

m

m / m

m

m

m 3

first reactor

5.40

22.00

4.07

-

-

504

...

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Abstract

The invention discloses a double bubble column reaction device used for oxidizing p-xylene (PX) to produce terephthalic acid (TA) and a reaction process. The device is composed of two bubble column reactors, wherein a second reactor is an airlift inner-loop bubble column having a tower body with a large height-diameter ratio or a built-in draft tube. After reaction materials are mixed, the mixed materials enter a first bubble column reactor, the reaction slurry enter the second bubble column reactor, under the action of air bubbling, the PX is oxidized into the TA, crystallization is performed, filtration is performed, washing is performed, hydrorefining is performed, and therefore the refined terephthalic acid product is obtained. According to the device and process provided by the invention, a stirring device of a traditional continuous stirred tank reactor is eliminated, the bubble columns with two-stage in-series operation are adopted as an oxidation reactor, so that the reaction performance is more inclined to that of a plug flow reactor, the comprehensive reaction speed is improved to some extent, the burning consumption of the raw materials is reduced, and the conversion rate of the PX and the yield of the TA are improved.

Description

technical field [0001] The invention relates to a double-bubble column reaction device and a reaction method for producing terephthalic acid (TA) by oxidation of p-xylene (PX), which is suitable for the existing oxidation with acetic acid as a solvent and gas containing molecular oxygen Various processes for producing TA from PX. Background technique [0002] Purified terephthalic acid (PTA) is a very important industrial raw material, mainly used in the production of polyethylene terephthalate (PET) fibers and resins, and PET is widely used because of its excellent physical and mechanical properties It is applied to all aspects of the national economy and is closely related to people's lives. At present, PTA is mainly produced by the air liquid phase oxidation method of PX. In this method, PX is mixed with solvent acetic acid, catalyst cobalt acetate, manganese acetate, hydrogen bromide (or tetrabromoethane) and then enters the oxidation reactor. Introduce air or enriched...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/24B01J10/00C07C51/265C07C63/26
Inventor 李希宁术余成有为王丽军
Owner ZHEJIANG UNIV
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