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Process and apparatus for purifying arene oxidizing tail gas

A technology for oxidizing tail gas and aromatic hydrocarbons, applied in chemical instruments and methods, separation methods, preparation of organic compounds, etc., can solve the problems of high consumption, large consumption of combustion accelerants, large investment, etc., and achieves the effect of reducing costs and facilitating industrial applications.

Inactive Publication Date: 2007-06-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this method are: the equipment investment is large, and precious metals need to be used as catalysts; the consumption of combustion aids is large, and its consumption is 4 to 8 times higher than the content of organic matter in the treated tail gas; at the same time, although this method burns toxic and harmful of organic content, but increases CO2 emissions many times over, and the organic content is not recycled
The main problem of this method is that the cost of desorption and recovery of organic matter is too high. After desorption with superheated steam or nitrogen, the desorbed gas needs to be condensed and liquefied, and rectified to separate and remove organic components. Because the content of organic matter in the desorbed gas is not enough High, it will consume a lot of energy for the treatment of desorbed gas. When it is used in large-scale industrial production, this part of investment and operation costs are considerable, which restricts the general application of this method

Method used

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  • Process and apparatus for purifying arene oxidizing tail gas
  • Process and apparatus for purifying arene oxidizing tail gas
  • Process and apparatus for purifying arene oxidizing tail gas

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Considering the tail gas purification problem in the production process of terephthalic acid (TA), the technical scheme shown in Figure 1 is adopted. Raw material p-xylene (PX) and air are added to the oxidation reactor 1 and reacted therein to generate terephthalic acid. The tail gas after the reaction enters the condenser 2 and the washing tower 3 from the tail gas pipe to cool down and wash, and recover most of the organic components in the gas; The tail gas containing a small amount of organic matter enters the adsorption bed 4 for adsorption and purification before being discharged. Part of the compressed air drawn from the air feed pipe of the oxidation reactor enters the adsorption bed 5 through the side line desorption air pipe to contact with the saturated adsorbent in the bed, desorbs organic matter and then enters the oxidation reactor for recycling. The adsorption bed 4 and the adsorption bed 5 are regularly switched through the switching valves 8-15 to real...

Embodiment 2

[0044] Considering the tail gas purification problem in the terephthalic acid production process, the technical scheme shown in Figure 1 is still adopted. The difference from Example 1 is that the adsorption bed adopts the radial bed shown in Figure 3 to reduce the pressure drop of the bed layer, and at the same time, the adsorbent adopts activated carbon fiber. The operating parameters of the adsorbent and the adsorption bed are listed in Table 4, and the remaining operating parameters are the same as in Example 1.

[0045] Adsorbent name

[0046] It can be seen from Table 4 that activated carbon fibers have a higher adsorption capacity than activated carbon particles, and the bed pressure is reduced. In this way, less adsorbent is needed to achieve the same purification purpose. In addition, the use of radial beds reduces the distance for gas to pass through the adsorbent bed, which greatly reduces the total pressure drop of the bed, which is beneficial to reduce e...

Embodiment 3

[0048] Considering the tail gas purification problem in the terephthalic acid production process, the technical scheme shown in Figure 4 is adopted. The main part is similar to Figure 1, the difference is that Figure 4 uses system nitrogen as the desorption gas, and the nitrogen comes from the terephthalic acid dryer. A part of the used purge gas is drawn from it, and the desorbed organic matter is returned to the desorption gas scrubber 16 for recovery and treatment along with the gas. Adsorption bed 4 performs adsorption operation at higher pressure and lower temperature, and the desorption gas used in adsorption bed 5 has a higher temperature and lower pressure, which is beneficial to the desorption operation. The operating parameters of adsorption bed 4 are the same as those in embodiment 1 or embodiment 2, and the operating parameters of adsorption bed 5 are listed in Table 5.

[0049]

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PUM

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Abstract

The present invention discloses process and apparatus for purifying arene oxidizing tail gas. Two adsorbing beds with filled adsorbent are adopted for alternate adsorption and desorption of organic matter from the tail gas. While one adsorbing bed adsorbs organic matter from the tail gas, the other one desorbs to recover organic matter with compressed air or nitrogen as the desorbing gas and to regenerate the adsorbent, with the desorbed organic matter being returned to the oxidizing system together with the desorbing gas for reuse. The present invention needs no additional desorbed gas treating apparatus and recovers organic matter directly with the tail gas treating apparatus in the oxidizing system, such as condenser, spraying tower, gas waster, etc. The present invention has low adsorption purifying cost and is suitable for industrial use.

Description

technical field [0001] The invention relates to a method and device for purifying aromatic hydrocarbon oxidation tail gas, comprising 2 to 3 adsorption beds and related adsorption-desorption processes, suitable for purification treatment of various aromatic hydrocarbon oxidation tail gas and recycling of organic components. Background technique [0002] The liquid-phase catalytic oxidation of aromatics is an important industrial process for the preparation of various aromatic carboxylic acids and alcohols and aldehydes containing aromatic rings, such as the liquid-phase air oxidation of p-xylene to prepare terephthalic acid, and the oxidation of m-xylene to m-benzene Dicarboxylic acid, toluene oxidation to benzoic acid and benzaldehyde, trimellitic acid from trimellitic acid, 2-6 dimethylnaphthalene or 2-6 diisopropylnaphthalene to 2-6 naphthalene dicarboxylic acid, cumene Oxidation of phenol, and so on. These processes all use air as the oxidant, and carry out the oxidatio...

Claims

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Application Information

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IPC IPC(8): B01D53/04C07C51/265
Inventor 李希王丽军成有为郭霞
Owner ZHEJIANG UNIV
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