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Coal-to-olefin industrial exhaust gas comprehensive treatment device and method

A technology for industrial waste gas and coal-to-olefins, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as high concentration of organic matter, difficulty in recycling, unstable concentration and gas volume, difficulty in reaching the tail gas index, etc., and achieve the tail gas index Excellent, efficient treatment and resource utilization, high explosion-proof effect

Active Publication Date: 2019-10-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the high freezing point of methyl formate and dimethyl oxalate in coal-to-olefin waste gas, which is easy to hydrolyze and produces an acidic solution after hydrolysis; the high concentration of organic substances such as methanol, ethanol, and ethylene glycol is difficult to recycle; the high oxygen content of waste gas, The concentration and gas volume are unstable, which leads to problems such as difficulty in reaching the exhaust gas index

Method used

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  • Coal-to-olefin industrial exhaust gas comprehensive treatment device and method
  • Coal-to-olefin industrial exhaust gas comprehensive treatment device and method
  • Coal-to-olefin industrial exhaust gas comprehensive treatment device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the tank area of ​​the coal-to-olefins plant, the exhaust gas is treated by the breathing valve on the top of the tank. After the exhaust gas from the tank roof breathing valve is discharged, it enters the exhaust gas collection pipeline, and enters the treatment device through the blower at the front of the device, with a concentration of 20000-400000mg / m 3 , the main pollutants are methanol, ethanol, ethylene glycol, methyl formate, dimethyl oxalate, and may also contain a small amount of other organic pollutants, including various alkanes, alkenes, cycloalkanes, halogenated hydrocarbons, aromatic compounds, etc. . After the exhaust gas passes through the blower, it first enters the water washing unit. The water washing unit uses softened tap water as the washing liquid. The water washing unit adopts a multi-stage spray washing tower. The gas-liquid contact time exceeds 2 minutes. After washing, the pollutants in the exhaust gas are transformed into methanol, The ...

Embodiment 2

[0042] Treatment of high-concentration coal-to-olefin waste gas discharged from the reaction kettle of the coal-to-olefin plant, the waste gas composition of nitrogen (volume fraction) is 86%, and dimethyl oxalate is 105,000 mg / m 3 , Methanol 100000mg / m 3 , ethanol 61000mg / m 3 , ethylene glycol 41500mg / m 3 , other hydrocarbons 8000mg / m3. Other hydrocarbons mainly include alkanes, olefins and a small amount of aromatics and halogenated hydrocarbons. The total gas flow rate is 100~300m 3 / h, the temperature is lower than 120°C, the washing unit adopts a spray tower, the superficial speed of the tower is 2.0m / s, the overall size is Φ3600×8500mm, the quantity is 2, the amount of softened water is 105t / h, and the material of the washing unit is 304 stainless steel; the membrane Component parameters, material POMS, filling volume 40㎡, methanol / nitrogen separation coefficient 38.5, methanol / oxygen separation coefficient 20.4, permeation flux 1.25-1.48m 3 / ㎡h; adsorption tank par...

Embodiment 3

[0049] Treat the waste gas discharged from the breathing valve of the dimethyl oxalate storage tank, the waste gas composition is: air (volume fraction) is 98%, dimethyl oxalate 5700mg / m 3 , Methanol 12mg / m 3 , ethanol 15mg / m 3 , ethylene glycol 3mg / m 3 , other hydrocarbons 200mg / m 3 . Other hydrocarbons mainly include alkanes and alkenes. The total flow of gas flow is 200m 3 / h, temperature 70°C (±5°C), washing unit adopts packed tower, superficial velocity 2.0m / s, external dimension, Φ2200×5000mm, quantity 2, demineralized water consumption 40t / h, washing unit material stainless steel; Membrane module parameters, material PDMS, filling volume 20㎡, methanol / nitrogen separation coefficient 33.5, methanol / oxygen separation coefficient 18.6, permeation flux 1.85-2.10m 3 / ㎡h; adsorption tank parameters, molecular sieve adsorbent, iodine adsorption value of the adsorbent 600-900mg / g, filling capacity 3.6t, adsorption tank size Φ3200×6000mm, quantity 2 sets.

[0050] The mai...

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Abstract

The invention relates to a coal-to-olefin industrial exhaust gas comprehensive treatment device and method. The coal-to-olefin industrial exhaust gas comprehensive treatment device and method are mainly applied to treatment and resource utilization of exhaust gas emitted in organized and unorganized modes by tank areas, platforms and production devices in the field of coal chemical industry. Specifically, a washing process and three organic exhaust gas recovery techniques of membrane separation, condensation and adsorption are innovated, optimized and coupled to form the coal-to-olefin industrial exhaust gas treatment method. The method does not include the heating step or the heat production step, the explosion-proof property and safety are high. In the washing process, soluble organic matter is recovered, the acidity is reduced, the temperature is decreased, then resource utilization is conducted through a combination process of membrane separation, condensation and adsorption, and thus the requirements of resource utilization and emission on standard are met. According to the coal-to-olefin industrial exhaust gas comprehensive treatment device and method, the difficult problem of coal-to-olefin exhaust gas treatment is solved, organic exhaust gas emitted by industrial devices, the tank areas, the vehicle-loading platforms and the like in the coal-to-olefin field can be efficiently removed and subjected to resource utilization, and the coal-to-olefin industrial exhaust gas comprehensive treatment device and method have application prospects.

Description

technical field [0001] The invention relates to a coal-to-olefins industrial waste gas comprehensive treatment device and method, which are mainly used in the waste gas treatment and resource utilization of tank farms, platforms, and production devices in the field of coal chemical industry for organized and unorganized discharge. Specifically, it is a coal-to-olefin industrial waste gas treatment method formed by innovating and optimizing the three organic waste gas recovery technologies of water washing process, membrane separation, condensation and adsorption, and coupling them. Background technique [0002] Coal-to-olefins, or coal-based methanol-to-olefins, refers to the technology of synthesizing methanol from coal and then producing olefins such as ethylene and propylene through methanol. Coal-to-olefins is the production of low-carbon olefins by substituting "coal" for "oil", which is one of the important ways to realize China's energy strategy of "substituting coal ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/72B01D53/22B01D53/02B01D5/00
CPCB01D5/00B01D53/02B01D53/228B01D53/72B01D53/75B01D53/78B01D2053/221B01D2253/102B01D2253/106B01D2257/70
Inventor 魏昕栾金义杨丽侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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