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System and method for co-processing N2O and VOC in caprolactam production waste gas

A technology of synergistic processing and caprolactam, which is applied in the production of caprolactam, gas treatment, adipic acid production, etc., can solve the problems of increasing the production and operation costs of enterprises, reducing safety, and easily causing explosions, so as to save production and operation costs and make it easy to obtain The effect of long service life and low cost

Pending Publication Date: 2019-12-06
HENAN SHENMA NYLON CHEM +3
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the existing VOC treatment technology has low efficiency and high cost when dealing with tert-butanol, and additional oxidizing substances need to be introduced, which increases the production and operation costs of the enterprise, and due to the introduction of oxidizing substances, the safety is greatly reduced, and it is easy to cause Explosions and other major safety accidents

Method used

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  • System and method for co-processing N2O and VOC in caprolactam production waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A kind of N in the waste gas of caprolactam production 2 O and VOC co-processing system, as attached figure 1 As shown, the system includes a gas storage device 1 , a water pump 2 , a water washing device 3 , an air bag 4 , a catalytic reaction device 5 , an online flue gas monitoring device 6 , an induced draft fan 7 and a chimney 8 . The waste gas from caprolactam production enters the gas storage device 1 for buffering, and enters the water washing device 3 from bottom to top. At the same time, the spray water enters from the top of the water washing device 3 through the water pump 2. The tert-butanol in the waste gas is condensed and absorbed, and is discharged from the water washing device along with the waste water. The bottom of 3 is discharged, the exhaust gas continues to pass into the air bag 4, and the N 2 Dilute the exhaust gas to reduce N in the exhaust gas 2 The concentration of O, the pretreated exhaust gas enters the catalytic reaction device 5, under ...

Embodiment 2

[0061] Use as attached figure 1 The system shown, for N in caprolactam off-gas 2 The processing method steps of O and VOC are as follows:

[0062] (1) Pretreatment: The waste gas from the production of caprolactam enters the spray washing tower, and the flow rate of the waste gas is 8000m 3 / h, the concentration of tert-butanol in the exhaust gas is 10000mg / m 3 , N in exhaust gas 2 The concentration of O is 300,000ppm, the temperature in the washing tower is 20°C, and the flow rate of spray water is 5t / h. Part of the tert-butanol in the treated waste gas is condensed and absorbed, and is discharged to the corresponding water treatment unit along with the waste water. Exhaust gas passes through N 2 Diluted, N 2 The volume concentration of O is reduced to 60500ppm, and the concentration of tert-butanol in the exhaust gas after pretreatment is 2000mg / m 3 ;

[0063] (2) Catalytic reaction: The pretreated exhaust gas enters the 2-stage adiabatic fixed-bed catalytic reactor, ...

Embodiment 3

[0066] Use as attached figure 1 The system shown, for N in caprolactam off-gas 2 The processing method steps of O and VOC are as follows:

[0067] (1) Pretreatment: The waste gas from the production of caprolactam enters the spray washing tower, and the flow rate of the waste gas is 8000m 3 / h, the concentration of tert-butanol in the exhaust gas is 10000mg / m 3 , N in exhaust gas 2 The concentration of O is 300,000ppm, the temperature in the washing tower is 20°C, and the flow rate of spray water is 6t / h. Part of the tert-butanol in the treated waste gas is condensed and absorbed, and is discharged to the corresponding water treatment unit along with the waste water. Exhaust gas passes through N 2 Diluted, N 2 The volume concentration of O is reduced to 60100ppm, and the concentration of tert-butanol in the exhaust gas after pretreatment is 2010mg / m 3 ;

[0068] (2) Catalytic reaction: The pretreated exhaust gas enters the 2-stage adiabatic fixed-bed catalytic reactor, ...

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Abstract

The invention discloses a system for co-processing N2O and VOC in caprolactam production waste gas. According to the flow direction of the waste gas, the system includes a gas storage device, a waterwashing device, a gas dilution device, a catalytic reaction device, a flue gas monitoring device, and a gas discharging device. The invention also discloses a method for co-processing the N2O and theVOC in the caprolactam production waste gas by using the system. The caprolactam production waste gas enters the water washing device from the gas storage device, after pretreatment is performed, thepretreated product enters the catalytic reaction device, a redox reaction is performed under the action of a catalyst, various indexes of the products are detected by the flue gas monitoring device, and discharge is performed through the gas discharging device. The method utilizes oxidability of the N2O in the caprolactam production waste gas for the first time to synergistically treat tert-butanol in the caprolactam production waste gas, the conversion rate of the N2O is 99.95-99.98%, the conversion rate of the tert-butanol is 99.96-99.99%, and the purpose of treating waste with waste is realized; and the system and the method are technological innovation in the field of energy conservation and environmental protection, and have economic, practical and industrial application prospects.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a kind of N 2 System and method for co-processing O and VOC. Background technique [0002] Caprolactam is one of the important basic organic chemical raw materials. It is mainly used in the production of nylon 6 engineering plastics and nylon 6 fibers, and is widely used in electronics, automobiles, textiles, machinery and other fields. At present, caprolactam is mostly produced by cyclohexanone ammoximation process in my country. The main process units include hydrogen peroxide preparation unit, cyclohexanone production unit, cyclohexanone ammoximation unit, caprolactam refining unit and ammonium sulfate recovery unit, cyclohexanone amidoxime The chemical device is the core process, which uses hydrogen peroxide, cyclohexanone and ammonia under low pressure conditions to use tert-butanol as a solvent to synthesize cyclohexanone oxime under the action of a titanium catalyst...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/54
CPCB01D53/8631B01D53/8621B01D2257/402Y02C20/10Y02P20/30
Inventor 陈标华赵铎史红军陈聚良梁巍屈建海陈亚春钟儒学朱子强张军明冯继伟王晓鹏刘荣鸽吕国辉张卫红李云鹏
Owner HENAN SHENMA NYLON CHEM
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