KR101360763B1 - Method For Removing Harmful Gases using the conversion reagent of white plume - Google Patents

Abstract

The present invention relates to a method for removing harmful gases, and more particularly, a process of converting red lead or sulfur lead to white lead by treating a white lead converting agent to a harmful gas containing red lead or sulfur lead by nitrogen oxide ((N _x O _y )). The present invention relates to a method for removing harmful gases including removing white lead, and the method for removing harmful gases according to the present invention provides a high efficiency of treating harmful gases such as sulfur lead and red lead using a white lead converting agent. More streamlined and cost-effective.

Description

Method for removing harmful gases using the conversion reagent of white plume

The present invention relates to a method for removing harmful gases that can effectively treat harmful gases such as red lead and sulfur lead by nitrogen oxides.

Hazardous gases from industrial sites generate environmental pollution and odors, and have a harmful effect on the human body. In particular, red smoke and sulfur smoke such as nitrogen oxides generated in semiconductor processes or metal washing processes generate odors. It is a representative noxious gas that causes a disgust and visual disgust.

Various methods for removing such harmful gases and applying them to industrial sites have been proposed. For example, there is a method of spraying water on the outlet of harmful gas, but secondary pollutants, sediments, etc. are generated, and it is difficult to remove red smoke and sulfur smoke. Alternatively, neutralization of harmful gases with a hydrophilic alkali solution such as caustic soda and the like, and removal of nitrogen oxides, sulfur oxides and harmful gases using oxidants and chemicals in acidic and alkaline waters produced by electrolysis with electrolyzed water. There is a way. The above-mentioned methods have a problem that the removal rate of white lead is high but the removal rate of red lead and sulfur lead is low, the removal process is complicated and the cost is low in terms of cost.

Another method is to remove harmful gases by sequentially passing them through an ion exchange filter and an adsorbent. Although the method is excellent in terms of the treatment efficiency of harmful gases, mainly using inorganic adsorbents such as activated carbon, silicic acid, etc. as the adsorbent, there is a problem that the operating cost increases because the adsorbent should be exchanged frequently in the process.

Accordingly, the present invention provides a method for removing harmful gases, which is advantageous to be applied to industrial sites at a simple and economical cost with a high efficiency of treating harmful gases.

An object of the present invention for solving the above problems is to provide a method for removing harmful gases having a high removal rate of harmful gases such as red lead and sulfur lead, and a simple and cost-effective process.

According to an aspect of the present invention,

Regarding the harmful gas removal method comprising the step of converting the red smoke or sulfur lead to white smoke by treating the white smoke conversion agent to the harmful gas containing red lead or sulfur lead by nitrogen oxide (N _x O _y ) and removing the white lead. will be.

The whitening agent is selected from ammonia, ammonium hydroxide, ammonium sulfate, ammonium sulfide, ammonium fluoride, ammonium chloride, ammonium iodide, ammonium oxalate, ammonium nitrate, ammonium carbonate, ammonium phosphate, ammonium thiocyanate It may be one or more. In addition, the ammonia or ammonium salt may be included in an amount of 0.01% by weight or more based on the whitening agent.

Removing the white lead may be performed by spraying water on the white lead. In addition, the removing of the white lead may remove the white lead by electric precipitation (EP) method.

The method for removing harmful gases according to the present invention converts red lead and sulfur lead to white lead, thereby improving the removal rate of red lead and sulfur lead, and can reduce visual disgust because red lead and sulfur lead is discharged into white lead. In addition, the present invention can further improve the treatment efficiency of harmful gases while minimizing the smell, toxicity, environmental pollution to chemicals by using a low concentration of white smoke conversion agent.

1 briefly illustrates a process for removing a noxious gas according to the present invention.
Figure 2 shows the step of converting to white lead according to an embodiment of the present invention.
Figure 3 shows the step of removing the white smoke according to the fifth embodiment of the present invention.
Figure 4 shows the step of removing the white smoke according to the sixth embodiment of the present invention.
Figure 5 shows the removal of harmful gases according to Comparative Example 1 of the present invention.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a method for removing harmful gases, and relates to a method for converting red lead and sulfur lead by nitrogen oxide (N _x O _y ) into white lead.

More specifically, referring to FIG. 1, the method for removing harmful gases according to the present invention includes the steps of converting to white lead and removing the white lead.

The step of converting the white smoke to the harmful gas is converted to the white smoke by treating the harmful gas white lead. The harmful gas may include red lead and sulfur lead by nitrogen oxide (N _x O _y ). According to one embodiment of the present invention, the step of converting to white lead may be exemplified by the following Scheme 1 and Scheme 2, but is not limited thereto.

Scheme 1

1-1 Red  Occur

Cu + 4HNO ₃ → Cu (NO ₃ ) ₂ + 2NO ₂ (red lead) + 2H ₂ O

1-2 white lead  transform

NH ₃ + H ₂ O → NH ₄ OH

4NO ₂ + NH ₄ OH → NH ₄ NO ₂ + 2NO ₃ + HNO (white smoke)

Scheme 2

2-1 Yellow  Occur

Cu + 4HNO ₃ → Cu (NO ₃ ) ₂ + 2NO ₂ (red lead) + 2H ₂ O

2NO ₂ ↔ N ₂ O ₄ (sulfur lead; reversible reaction at low temperature, equilibrium)

2-2 white lead  transform

NH ₃ + H ₂ O → NH ₄ OH

2N ₂ O ₄ + NH ₄ OH → NH ₄ NO ₂ + 2NO ₃ + HNO (white lead)

Looking at the reaction scheme 1 and the reaction scheme 2, it is possible to reduce the appearance of aversion in order to discharge the red smoke and sulfur lead that can give a odor, such as odor and appearance to white lead. In addition, the white smoke can be easily removed by moisture and electrostatic precipitating is finally discharged as a colorless gas during the discharge of harmful gas to prevent environmental pollution, odors and the like.

The whitening agent may comprise ammonia and / or ammonium salts, the ammonium salts are ammonium hydroxide, ammonium sulfate, ammonium sulfide, ammonium fluoride, ammonium chloride, ammonium iodide, ammonium oxalate, ammonium nitrate, It may be one or more selected from ammonium carbonate, ammonium phosphate and ammonium thiocyanate, preferably ammonia and ammonium hydroxide in view of white lead conversion and solubility.

The ammonia and / or ammonium salt may be dissolved in water at a concentration of 0.01% by weight or more, preferably 0.01 to 30% by weight, and 0.01 to 10% by weight in consideration of the smell of ammonia, etc., depending on the treatment environment. More preferably 0.1 to 3% by weight, even more preferably 0.1 to 1.5% by weight. If the concentration of the ammonia and / or ammonium salt is 0.01% by weight or more can provide a high white lead conversion. In addition, a low concentration of ammonia and / or ammonium salt may be used depending on the treatment environment. When the low concentration is used, it is possible to reduce the occurrence of odor due to ammonium or the like while providing excellent white smoke conversion, and also contaminates the environment by ammonia and / or ammonium salt. Etc. can be reduced.

In addition, the white lead converting agent may further include one or more selected from potassium hydroxide, sodium hydroxide, aluminum hydroxide and magnesium hydroxide, and preferably potassium hydroxide and sodium hydroxide. The white lead converting agent may be used by dissolving in water at a concentration of 0.01% by weight or more, preferably 0.01 to 30% by weight, and 0.01 to 10% by weight, more preferably 0.1 to 3 in consideration of reactivity with water and the like. Weight percent.

The step of removing the white smoke is to remove the white smoke by spraying water on the white lead, the injection form of the water, the injection amount of water can be appropriately adjusted according to the amount of white lead.

In addition, the removing of the white lead may remove the white lead by electric precipitation (EP) method. The dust collector corona discharges the generated white smoke to form an electric field, and collects and removes the dust collector by electrostatic force. The present invention can effectively remove white lead and fine particles in the white lead using the electrostatic precipitating method. In the electric dust collecting method, the supply power and the like can be appropriately adjusted according to the amount of white lead. In addition, an electrostatic precipitator known in the art may be used without departing from the scope of the present invention, and the present invention is not particularly limited.

Preferably, the removing the white lead may be performed by electrostatically collecting the white lead and then spraying water to remove the white lead.

Hereinafter, the present invention will be described in more detail with reference to the following examples and comparative examples. The following examples are only illustrative of the present invention and do not limit the scope of protection of the present invention.

Example  1 to 4: white lead  Rating of conversion

1) Cu (20 g) was added to a three-necked flask, and HNO ₃ (60%, 250 mL) was added to generate red lead. By following the bubbling in an aqueous solution of the compound as shown in Table 1 (ultra pure water 1L, wt%), the generation of white lead was visually confirmed and presented in Table 1.

Evaluation method: Red lead only ●, Red lead and white lead simultaneously 동시, White lead only ○

Configuration Example 1 Example 2 Example 3 Example 4 Concentration (M) NH ₃ NH ₄ OH NaOH KOH 0.1 ○ ○ ◐ ◐ 0.5 ○ ○ ◐ ◐ One ○ ○ ○ ◐ 2 ○ ○ ○ ○ 3 ○ ○ ○ ○ saturation ○ ○ ○ ○

2) The formed white lead was analyzed by FT-IR to confirm the detection of NH ₃ and presented in Table 2. If not detected by the FT-IR, it is described as X.

Configuration Example 1 Example 2 Concentration (M) NH ₃ NH ₄ OH 0.1 X X 0.5 X X One X X 2 X X 3 X X saturation detection detection

Looking at Table 1 and Table 2, NH ₄ OH and NH ₃ shows excellent white lead conversion at high and low concentrations. In addition, NaOH and KOH produced severe exothermic reactions during the preparation of the aqueous solution, but showed good white smoke conversion at low and high concentrations.

Example 5

Of embodiment 2 and 3 by the generation of the same, jeokyeon ml of HNO ₃ (60%, 500mL) in Cu (30 g) to the harmful gas removing apparatus as presented after the injection in the device example 1 NH ₃ (1 M ) Was converted into white lead by contact with red lead at a 35 LPM injection amount (FIG. 2). Next, after discharging 80 LPM of water at the outlet of the white smoke for one minute, the discharge state of the white smoke at the outlet is shown in FIG. 3.

Example 6

After the conversion of white lead was carried out in the same manner as in Example 5 except that the WET EP was operated in the outlet of the white lead, the discharge state of the white lead at the outlet is shown in FIG.

Comparative Example 1

As shown in FIG. 5, HNO ₃ (68%, 500 mL) was added to Cu (20 g) to the noxious gas removal device to generate red smoke, and injected into the equipment. While spraying. The discharge state of white lead at the outlet is shown in FIG.

2 to 5, it can be seen that the harmful gas removal method according to the present invention can effectively remove the red smoke using a low concentration of the white smoke conversion agent. In addition, NH ₃ was not detected when the FT-IR was measured at the final outlet in Examples 5 and 6. On the other hand, when spraying only water in the red smoke as in Comparative Example 1 it can be confirmed that the red smoke is discharged as it is.

Claims (9)

Converting red lead or sulfur lead to white lead by treating the white lead converting agent to harmful gases including red lead and sulfur lead by nitrogen oxide; and
Removing the white lead;
Removing the white smoke is to remove the white smoke by electric precipitation (EP) method,
The whitening agent is a harmful gas removal method characterized in that the ammonium hydroxide. delete delete delete The method of claim 1,
The ammonium hydroxide is harmful gas removal method characterized in that it comprises at least 0.01% by weight relative to the total weight of the white lead conversion agent. The method of claim 1,
The ammonium hydroxide is harmful gas removal method characterized in that it comprises 0.1 to 1.5% by weight relative to the total weight of the white lead converter. The method of claim 1,
The white smoke converting agent further comprises at least one selected from potassium hydroxide, sodium hydroxide, aluminum hydroxide and magnesium hydroxide.
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