Process for producing terephthalic acid and device therefor

A technology of terephthalic acid and production equipment, which is applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve problems such as difficult to achieve energy consumption of the whole process, huge separation equipment, high temperature and pressure of reaction tail gas, etc.

Inactive Publication Date: 2005-07-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But above-mentioned method is somewhat difficult to implement, and for example patent US5723656 and US6143925 introduce and finish the task of all acetic acid dehydration by a rectification tower that is connected with bubble column reactor and just require separation equipment very huge, because the temperature pressure of reaction tail gas is higher , also contains a large amount of inert gas
On the other hand, the various patented technologies currently disclosed are partial energy-saving measures. Although they may have a certain energy-saving effect on some units and equipment after implementation, it is difficult to achieve the goal of the lowest energy consumption in the entire process.

Method used

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  • Process for producing terephthalic acid and device therefor
  • Process for producing terephthalic acid and device therefor
  • Process for producing terephthalic acid and device therefor

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Embodiment 1

[0075] Adopt the method and equipment that the present invention provides to carry out the terephthalic acid flow process and device design of annual output 600,000 tons, annual production time 7600 hours, by figure 1 The determined functions and tasks of each unit are obtained through system combination optimization image 3 In the process shown, the process conditions of each unit equipment are determined according to the principle of minimizing material consumption and energy consumption, and the energy matching between each stream is optimized according to the principle of system energy integration. The obtained relevant process parameters are listed as follows according to the unit order:

[0076] 1. Bubble column reactor

[0077] use figure 2 The two bubble tower reactors shown are operated in parallel, the production capacity of a single reactor is 300,000 tons / year, and a single set of equipment is used for slurry treatment and tail gas treatment. The reactor size ...

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Abstract

The invention discloses a method for producing terephthalic acid (TA) and its device. The device is composed of three parts: bubble column reactor, slurry treating device, and exhaust gas treating device. The method is provided as follows: Adopting bubble column reactor with gas separating zone for liquid phase catalytic oxidation of xylene; adopting multistage vaporization, filtering and drying in slurry treating device for recovering solid TA; adopting multistage condensation of byproduced steam for recovering reaction heat in the exhaust gas treating device and recovering solvent by using azeotropy rectification method; determining related process conditions according to the demand of minimum production cost.

Description

technical field [0001] The invention relates to a production method and device for producing terephthalic acid (TA). 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 production process of TA includes three main parts: reaction unit, tail gas treatment unit and slurry treatment unit. The tasks and functions of ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/265C07C63/26
CPCY02P20/50
Inventor 李希王丽军成有为肖咸江
Owner ZHEJIANG UNIV
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