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A pretreatment method for waste gas produced by a purified terephthalic acid production unit

A technology for producing purified terephthalic acid, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve problems such as inability to recycle, achieve stable RTO operation, and reduce processing load.

Active Publication Date: 2022-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methyl acetate is a by-product of the PTA production process, and it is also an important chemical material. Methyl acetate enters the regenerative incinerator RTO along with the tail gas and cannot be recovered.

Method used

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  • A pretreatment method for waste gas produced by a purified terephthalic acid production unit
  • A pretreatment method for waste gas produced by a purified terephthalic acid production unit

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Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 6

[0020] The parameter control of specific embodiment and implementation effect are as shown in table 1:

[0021] Table 1

[0022]

[0023] Description of symbols: m 1 Exhaust gas mass flow rate; C 1 Organic matter content in exhaust gas; t 1 Exhaust gas temperature; t 2 Absorbent temperature; C 2 Absorbent mass concentration; n 1 Ratio of absorbent mass to exhaust gas mass; t 3 Rectification tower bottom temperature; n 2 Rectification column reflux ratio; ΔtRTO furnace temperature drop; ΔC 1 Decrease of benzene content in RTO exhaust gas; ΔC 2 Decrease of toluene content in RTO exhaust gas; ΔC 3 Decrease of xylene content in RTO exhaust gas; ΔC 4 Volatile organic compound content in RTO exhaust gas; m 2 Methyl acetate recovery.

[0024] Decrease calculation:

[0025] As mentioned above, the present invention utilizes the absorption process to pretreat the exhaust gas of the purified terephthalic acid production unit, reduces the RTO operating pressure of the e...

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Abstract

The invention discloses a pretreatment method for waste gas generated by a purified terephthalic acid production device. The specific steps are as follows: firstly, PTA waste gas is passed into an absorption tower, and sodium acetate solution is used as an absorbent in the absorption tower to absorb the waste gas in the PTA waste gas. Methyl acetate; then rectifying and separating absorbent and methyl acetate, collecting methyl acetate and absorbent, and recycling the absorbent. The method of the invention can be used to pretreat the waste gas produced by purified terephthalic acid, so that the RTO of the waste gas treatment facility regenerative incinerator can operate stably, and the exhaust gas discharged from the RTO meets the requirements of national environmental protection standards.

Description

technical field [0001] The invention relates to a pretreatment method for waste gas produced by a purified terephthalic acid production device, and belongs to the technical field of organic chemical industry. Background technique [0002] Purified terephthalic acid (PTA) is an important synthetic fiber raw material. The main component of the exhaust gas from the PTA production unit is nitrogen, which contains various organic substances such as methyl acetate, dibromoethylene, benzene, toluene, and xylene. The organic matter is mainly methyl acetate. Affected by the PTA production process, the content of organic matter in the tail gas fluctuates periodically, ranging from 100 to 50,000 mg / m 3 . Methyl acetate is a by-product of the PTA production process, and it is also an important chemical material. Methyl acetate enters the regenerative incinerator RTO along with the tail gas and cannot be recovered after being incinerated. When the concentration of organic matter in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
Inventor 张存吉沈伟林武民张洪陈筱金江益兰李华孟欣蔡守检
Owner CHINA PETROLEUM & CHEM CORP