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Treatment method of VOCs waste gas

A treatment method and exhaust gas technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as difficult to achieve coupling treatment of VOCs exhaust gas and other exhaust gas resources, and achieve the effect of reducing the time required for oxidation

Pending Publication Date: 2022-07-15
盛隆资源再生(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned device system focuses on the adsorption treatment of VOCs, and it is difficult to realize the coupling treatment of VOCs waste gas and other waste gas resources

Method used

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  • Treatment method of VOCs waste gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The present embodiment provides a method for treating VOCs waste gas, and the process flow diagram is as follows figure 1 shown, including the following steps:

[0050] (1) The oxidative waste acid oxidizes the VOCs waste gas, and separates the oxidized gas and the oxidation residue; the temperature of the oxidation is 60 ° C; the oxidative waste acid is a binary mixed acid of sulfuric acid and nitric acid, and the concentration of nitric acid is 10wt% , the concentration of sulfuric acid is 10wt%; the liquid-gas ratio of oxidative waste acid and VOCs waste gas is 35L / Nm 3 ;

[0051] (2) absorbing the oxidizing gas obtained in step (1) with water to obtain an absorbing liquid, and the liquid-gas ratio of the absorption is 45L / Nm 3 ; The exhaust gas after absorption is discharged after post-treatment;

[0052] (3) The absorbing solution obtained in the electrochemical oxidation step (2), obtains a nitric acid solution; the parameters of the electrochemical oxidation i...

Embodiment 2

[0056] The present embodiment provides a treatment method for VOCs waste gas, and the treatment method includes the following steps:

[0057] (1) The oxidative waste acid oxidizes the VOCs waste gas, and separates the oxidized gas and the oxidation residue; the temperature of the oxidation is 50 ° C; the oxidative waste acid is a binary mixed acid of sulfuric acid and nitric acid, and the concentration of nitric acid is 12wt% , the concentration of sulfuric acid is 8wt%; the liquid-gas ratio of oxidative waste acid and VOCs waste gas is 28L / Nm 3 ;

[0058] (2) absorbing the oxidizing gas obtained in step (1) with water to obtain an absorption liquid, and the liquid-gas ratio of the absorption is 50L / Nm 3 ; The exhaust gas after absorption is discharged after post-treatment;

[0059] (3) The absorbing liquid obtained in the electrochemical oxidation step (2), obtains a nitric acid solution; the parameters of the electrochemical oxidation include: the anode is a titanium-plate...

Embodiment 3

[0063] The present embodiment provides a treatment method for VOCs waste gas, and the treatment method includes the following steps:

[0064] (1) The oxidative waste acid oxidizes the VOCs waste gas, and separates the oxidized gas and the oxidation residue; the temperature of the oxidation is 70 ° C; the oxidative waste acid is a binary mixed acid of sulfuric acid and nitric acid, and the concentration of nitric acid is 8wt% , the concentration of sulfuric acid is 12wt%; the liquid-gas ratio of oxidative waste acid and VOCs waste gas is 42L / Nm 3 ;

[0065] (2) absorbing the oxidizing gas obtained in step (1) with water to obtain an absorption liquid, and the liquid-gas ratio of the absorption is 40L / Nm 3 ; The exhaust gas after absorption is discharged after post-treatment;

[0066] (3) The absorbing solution obtained in the electrochemical oxidation step (2) is obtained, and a nitric acid solution is obtained; the parameters of the electrochemical oxidation include: the ano...

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Abstract

The invention provides a VOCs waste gas treatment method, which comprises: (1) oxidizing VOCs waste gas by using an oxidizing waste acid, and separating to obtain an oxidized gas and an oxidized residual liquid; (2) absorbing the oxidized gas obtained in the step (1) to obtain an absorption liquid; (3) oxidizing the absorption liquid obtained in the step (2) to obtain a nitric acid solution; the oxidizing waste acid in the step (1) comprises nitric acid. According to the method, the oxidizing waste acid serves as an oxidizing agent, VOCs are oxidized into CO2, meanwhile, nitric acid in the VOCs is reduced into NOx such as NO2 and / or NO, NOx is partially converted into nitric acid through absorption and oxidation, oxidation treatment of the VOCs waste gas is achieved, and the nitric acid in the oxidizing waste acid can be recycled; the treatment method is simple to operate, and the cooperative treatment of the VOCs waste gas and the oxidizing waste acid can be realized.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for treating exhaust gas, in particular to a method for treating VOCs exhaust gas. Background technique [0002] VOCs (volatile organic compounds) are volatile organic compounds, which are a class of organic compounds with a saturated vapor pressure of more than 70 Pa at room temperature and a boiling point of not higher than 260 °C under normal pressure. There are many kinds of VOCs, mainly including aldehydes, aromatic hydrocarbons, alkanes or ketones, etc. They are widely found in petrochemical, papermaking, mining, metal electroplating, home building materials, paint coatings and textiles and other industries. Human skin, cardiovascular system and respiratory system cause huge damage, and even have the risk of cancer and deformity; these pollutants are also important precursors of fine particulate PM2.5, which are extremely polluting to human health and the atmo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/44B01D53/18B01D53/14B01D53/96
CPCB01D53/78B01D53/44B01D53/18B01D53/1475B01D53/96B01D2258/02B01D2257/708B01D2251/504
Inventor 郎超
Owner 盛隆资源再生(无锡)有限公司