KR101358359B1 - Filtration media for gas and its manufacturing method - Google Patents

Abstract

According to the present invention, an adhesive is applied to the surface of a nonwoven fabric and an adsorbent material is attached thereon, and then the two nonwoven fabrics having the adsorbent material are attached to each other with the adsorbent material interposed therebetween with an aluminum lath interposed therebetween, using a compression roller. The present invention provides a gas filtration media and a method of manufacturing the same, wherein the gas filtration media according to the present invention prevent the flow or desorption of the adsorption material, thereby preventing contamination by solid fine particles such as dust generated from the adsorption material, and bending. It can be made into various shapes by processing, so that the assembling process of inserting and placing into the filter case is easy, and the filtration effect is maintained because the shape bent to the fluid pressure is maintained.
In addition, it is possible to minimize the pressure loss of the fluid by bending the shape of the gas filtration media accommodated in the filter to be freely deformed, and to reduce the power cost cost due to the large capacity of the blower, it is economical, and minimizes the flux of the fluid By increasing the contact time with the adsorbent material, the filtration efficiency can be increased.

Description

Filtration media for gas and its manufacturing method

The present invention relates to a gas filtration media and a method of manufacturing the same, and more particularly, to be able to be bent in various shapes, while maintaining the bent shape and the gas filtration media for removing harmful gases and odor gas and its It relates to a manufacturing method.

Air pollutants generated in industrial sites or around the living are classified into particulate dust and gaseous substances, and gas filters using adsorbent materials such as activated carbon are used to effectively remove gaseous pollutants and purify the air.

However, a gas filter filled with an adsorption material such as activated carbon has a problem that secondary pollution may occur due to dust generated from the adsorption material.

There is also a gas filter filled in the filter case with granular activated carbon, but such a gas filter has a problem in that the filtration efficiency is reduced due to the small area where granular activated carbon is in contact with the gas fluid.

In order to increase the filtration efficiency, a gas filter in which a flat filter medium containing an adsorption material is accommodated in the form of a tray in a filter case is disclosed in Korean Patent No. 10-0488410.

The gas filter has a disadvantage in that the amount of adsorbed material is increased, so it is advantageous to collect harmful gases in a high concentration, and the amount of harmful gases is collected. However, the pressure loss of the fluid is increased so that the flow rate decreases and the filtration process rate is lowered.

When the blower is enlarged in order to compensate for the pressure loss of the fluid, energy consumption increases and deformation of the filtration media occurs.

In particular, since the gas filter used in the clean room for semiconductor manufacturing needs to efficiently process a lot of air, the pressure loss must be small, and at the same time, the removal of highly corrosive acid gas causing metal corrosion to semiconductor ICs is required.

Therefore, in order to efficiently remove harmful gases by increasing the contact area while reducing the amount of adsorption material filling, or to manufacture filters having various shapes suitable for installation sites, it is necessary to change the shape of the gas filtration media in various ways to fill the filters.

The present invention can be bent to be deformed into various shapes in order to solve the above problems and needs, and the bent shape is maintained, and the gas filtration media excellent in the ability to remove the harmful components of odor gas and harmful gas and its manufacture It is an object to provide a method.

In order to achieve the above object, the present invention provides a gas filtration media and a method of manufacturing the same, wherein an adsorbent material is filled between nonwoven fabrics, and an aluminum lath is interposed in parallel with the nonwoven fabric.

Gas filtration media according to the present invention prevents the flow or desorption of the adsorption material to prevent contamination by solid particles, such as dust generated from the adsorption material, and can be inserted into the filter case by deforming into various shapes by the bending process. As a result, the assembly process is easy, and the shape bent against the pressure of the fluid is maintained, so that the filtration effect is maintained.

In addition, it is possible to minimize the pressure loss of the fluid by arranging the shape of the gas filtration media accommodated in the filter by bending freely, and to reduce the power cost cost due to the large capacity of the blower, it is economical, and minimizes the flux of the fluid Therefore, the filtration efficiency can be increased by increasing the contact time with the adsorption material.

Hereinafter, the present invention will be described in detail.

In order to bend the filtration media or to maintain the bent shape, the gas filtration media of the present invention attaches the adsorption material to one side of the nonwoven fabric, and the adsorption material layers of the two nonwoven fabrics on which the adsorption material is adhered to each other and aluminum It is made by inserting and attaching a lath.

Aluminum lath is an aluminum lath made of cut line and stretched in both directions to form an opening with perforated hole in the cut part, which has high strength, elasticity, light weight, good adhesion, easy handling and construction, durability, and deformation in impact Due to its unprecedented properties, it is widely used as a support plate in building applications.

In the present invention, aluminum lath supports the adsorption material attached between the nonwoven fabrics, maintains a stable filtration media form, and induces the processing fluid to stay in the adsorption material to increase the contact time, thereby increasing the harmful gas or odor gas. Increases the adsorption efficiency of

In addition, the aluminum lath does not have a high shape restoring force in comparison with other metal meshes when the filtering medium is bent, so that the aluminum lath can be deformed even with a small force. Even if the bend is maintained, it maintains the bent shape and maintains the shape of the filtration media against the pressure generated by the flow of gas blown into the filter.

Such various forms of deformation can realize a large filtration area in a small space so as to minimize the permeation flux of the permeating fluid, thereby improving the adsorption efficiency of harmful gases.

In addition, aluminum lath maintains excellent adhesion to prevent the adsorption material from being desorbed to the vibration or physical shock caused by the flow of gas in the filtration process, and aluminum has good durability because it is inert to the gas to be treated and the adsorption material.

Preferably, the thickness of the aluminum lath is 0.3 to 1.0 mm. If the thickness of the aluminum lath is less than 0.3 mm, the strength of supporting and maintaining the shape of the filtration media is weak, and deformation may occur for a strong wind speed and a large amount of air. Is more than 1.0 mm, the strength is high, the workability of bending work is reduced, and the amount of adsorbed material per unit area is small, which is undesirable in terms of filtration efficiency.

The aluminum lath may have a honeycomb shape or a diamond shape in the shape of the opening. When the shape of the opening is in the shape of a honeycomb, the length of the short width of the opening is 3-6 mm and the length of the long width of the opening is 5-10 mm. In the case where the shape of the opening is diamond-shaped, it is preferable that the length of the short width of the opening is 1 to 12 mm and the length of the long width of the opening is 3 to 22 mm.

If the length is too short in the opening of the aluminum lath, the opening of the aluminum lath becomes smaller, so that the cross-sectional area that can be ventilated becomes smaller, so that the pressure loss of the gas fluid is increased, and if the length is too long, the aluminum lath maintains the shape of the filtration media. It is not preferable because the shape of the filtration media may be deformed during operation because it does not have sufficient strength.

In the present invention, activated carbon, impregnated activated carbons, activated carbon containing calcium ferrite compounds, metal medicines, catalysts, and the like may be used as adsorption materials for filtering harmful gases and odor gases.

Activated carbon is one of the most commonly used materials for adsorption. It is an aggregate of amorphous carbon made from wood, lignite, anthracite, and coconut shell as raw materials. It is an adsorbent having a.

The adsorbent may have a surface area of 1000 mm 2 or more per g, and a functional group of carbon atoms on the surface adsorbs molecules of the adsorbate by attracting the surrounding liquid or gas.

Since general activated carbon has a nonpolar surface and physical adsorption power mainly by van der Waals forces, it does not have sufficient adsorption power for low boiling point components such as sulfur dioxide and ammonia, and therefore, impregnated activated carbon is preferably used for such gases. .

Impregnated activated carbon is chemically adhering to general activated carbon to selectively adsorb specific components. Activated carbon impregnated with sodium hydroxide or sodium carbonate is activated carbon for acid gas adsorption, and activated carbon impregnated with sulfuric acid or phosphoric acid is basic gas. It becomes activated carbon for adsorption.

In activated carbon containing a calcium ferrite compound (CaFe ₂ O ₄ or Ca ₂ Fe ₂ O ₅ ) which is an adsorption material of the present invention, the calcium ferrite compound exhibits high activity due to the release of active oxygen in its molecular structure to the outside. The released calcium ferrite compound accepts oxygen from the outside, and the oxygen inside the calcium ferrite compound molecular structure becomes unstable again due to environmental changes and converts into active oxygen. It acts as a catalyst for the catalyst, and the calcium ferrite compound itself has an acid gas absorption capability and can be used for exhaust gas purification from a combustion device or the like.

Therefore, when oxidatively decomposing organic compounds containing halogen elements such as fluorine (F), chlorine (Cl) and bromine (Br), the halogen compounds contained in the decomposition products are absorbed and removed by activated carbon containing calcium ferrite compounds. Therefore, it is possible to remove acid gas such as sulfur dioxide generated from waste incineration through neutralization reaction, and to suppress the generation of harmful gases such as dioxins, and thus it can be usefully used as an exhaust gas purifier for waste incinerators.

Activated carbon containing a calcium ferrite compound is prepared by adjusting a coal material containing calcium oxide and ferric oxide so that the molar ratio of calcium / iron is 1.0 to 3.0, and mixing it with coal and calcining at 1100 to 1200 ° C. in the presence of oxygen.

Looking at the above process in more detail, when the coal mixture of coal ash is heated up, the moisture contained in the coal is evaporated to dry at around 100 ℃.

Moisture contained in the coal is a cause of lowering the hardness in the subsequent carbonization process, it is preferable to keep the temperature constant for 1 to 1.5 hours at 100 ℃ vicinity to sufficiently evaporate the moisture.

Thereafter, primary decomposition such as dehydration and deoxidation is performed while the temperature is raised to 400 ° C., and oxygen is released in the form of water, carbon dioxide, and the like, and volatile components are removed while the oxygen bond is broken while the temperature is raised to 700 ° C.

Subsequently, when the temperature is increased to 1100 to 1200 ° C., dehydrogenation produces a secondary planar structure by direct bonds between aromatic nuclei and a three-dimensional conformational structure by -CH ₂ -bonds. Is activated, forming a cross-connected structure.

In addition, calcium oxide and ferric oxide present in the coal ash react with each other to form a calcium ferrite compound (Ca ₂ Fe ₂ O ₅ or CaFe ₂ O ₄ ).

The activated carbon has a large surface area, and fine pores are complex, so that the specific surface area is large and has a high adsorption capacity. Therefore, the activated carbon can be used for purification of foods such as decolorization and deodorization, and gas purification such as dedusting and desulfurization. It is also useful for solvent recovery and wastewater treatment.

The addition amount of coal is suitable for 50 ~ 100 parts by weight of coal based on 100 parts by weight of the coal material molar ratio is adjusted, if less than 50 parts by weight of the addition of coal is insignificant and exceeds 100 parts by weight of calcium ferrite activity is lowered Not desirable

The metal medicament is a coating of a chemical on a metal oxide, such as aluminum oxide, zeolite, pearlite, particulate, and the catalyst may be preferably coated with a noble metal catalyst and cocatalyst such as platinum, palladium on the metal oxide.

Activated carbon containing calcium ferrite compound is used as adsorption material to remove acid gas that causes metal corrosion and to filter gas containing a lot of acid gas, such as filter or combustion gas used in clean room that needs large ventilation. It is more preferable.

The material used as the adsorption material may have a shape such as crushing, columnar, spherical, etc., the particle size is preferably 16 to 100 mesh.

If the particle size of the adsorption material is more than 100 mesh, secondary contamination that is likely to occur during filtration is likely to occur, and if the particle size of the adsorption material is less than 16 mesh, the contact area between the processing gas and the adsorption material is small, and the filtration efficiency is likely to decrease.

By weight of the adsorbent material is attached to the aluminum Ras is 400 ~ 1500 g / m together ² is desired, a weight of the amount of adsorption performance down of the absorption material is less than 400 g / m ² and lower the filter when 1500 g / m ² greater than It is difficult to effectively reduce the pressure loss of the gas fluid passing through, there is a problem that the bending angle is limited within a certain range when bending.

The gas filtration media is coated with an adhesive on one side of the nonwoven fabric, and the adsorbent material is adhered thereon, and then the two nonwoven fabrics having the adsorbent material face each other where the adsorbent material is present. It can be prepared by the method of attachment.

In this case, the adhesive used is preferably a rubber hot melt or an olefin hot melt, and the hot melt adhesive does not use a solvent that may cause pollution or pollution of the environment.

Rubber-based hot melts or olefin-based hot melts have a low melting temperature, so that the thermal energy is small when the adhesive is processed, it is economically advantageous, and has excellent adhesion with nonwoven fabrics of various materials.

In order to prevent the flow or desorption of the adsorption material in the gas filtration media to the non-woven fabric on both sides of the aluminum lath to which the adsorption material is attached to prepare a gas filtration media according to the present invention.

Non-woven fabric is a fabric made by binding fibers by mechanically, chemically or thermally arranging them in a non-woven direction without going through a woven fabric process.

Nonwoven fabrics are made of polypropylene, polyester, nylon, acrylic, polyurethane, etc., depending on the material of the fiber, and depending on the manufacturing method, chemical bonding, thermal bonding, needle punching, Spun bond, melt blown, stitch bond, and the like are classified into.

The nonwoven fabric used in the filtration media as in the present invention has spunbond as polyester material because it is required to have sufficient mechanical properties to protect the filtration media against the pressure of the passing gas fluid and to have sufficient pores for the gas fluid to pass through. Or heat-sealed products are most suitable.

The basis weight of the nonwoven fabric is preferably 15 ~ 70 g / m ² , if the basis weight is less than 15 g / m ² mechanical strength of the nonwoven fabric is lowered may cause breakage during bending or filtration process, the basis weight 70 If g / m ^{2 is} exceeded, the thickness of the nonwoven fabric becomes so thick that the fluid is clogged with the nonwoven fabric, resulting in a large pressure loss, which reduces filtration efficiency.

The gas filtration media manufactured as described above may be bent to be deformed into various shapes including waveforms and accommodated in the filter case.

Below, this invention is demonstrated concretely by an Example, a comparative example, and a test example. However, the following examples are only for illustrating the present invention, and the present invention is not limited by the following examples, and may be changed to other embodiments equivalent to substitutions and equivalents without departing from the technical spirit of the present invention. Will be apparent to those of ordinary skill in the art.

≪ Example 1 >

Apply an olefin-based hot melt adhesive (OPS500H, Oku Co., Ltd.) uniformly to one surface of a nonwoven fabric (polyester, span bond, weight 30 g / m ² , Toray Advanced Materials Co., Ltd.) using a heat gun, and activate carbon (particle size 35). Mesh, crushed, palm activated carbon, SGF-100, Samchully activated carbon Co., Ltd.) was applied in excess.

The two layers of the nonwoven fabric with the adsorbent material are placed against each other and the aluminum lath (0.8 mm in thickness and the shape of the opening is honeycomb, the opening width is 5 mm and the width of the opening is 5 mm in length). The length of the long direction is 7 mm, Ian Metal Co., Ltd. is inserted and attached while pressing by using a roller, followed by drying in a dryer at 50 ~ 60 ℃ for more than 5 hours, and the attached weight is 1000 g / m ^2. Dried gas filtration media was made.

The gas filter media 29.5 cm wide and 5 m long were then bent to form a corrugated corrugated plate, which was then placed in a filter case (305 (width) x 305 (height) x 150 (length) mm) and fixed to the gas. A filter was prepared.

<Example 2>

The powder samples were prepared by analyzing the components of the coal ash to measure the contents of calcium oxide and ferric oxide, and further adding calcium oxide or ferric oxide to adjust the molar ratio of calcium / iron of the coal ash to 2.0.

Coal was added to the sample of which the molar ratio was adjusted to the same weight as the sample, and the temperature was kept constant at 100 ° C. for 1 hour at a temperature increase, and thereafter, the temperature was raised to 1100 ° C. at a rate of 5 ° C./min and ventilated with the outside. After firing for 4 hours, the mixture was allowed to cool to prepare activated carbon containing a calcium ferrite compound.

The crystallinity was measured using XRD (X-ray Diffraction, D / max-3C, Rigaku denki Co., Japan) to analyze the crystallinity of the activated carbon containing the calcium ferrite compound prepared as described above.

Targets were analyzed using 2Theta 5 ~ 50 ° ranges of Cu Kα, Scanning speed 4 ° / min, Voltage / Current 30 ㎸ / 15 ,, and classification was ASTM (Ca ₂ Fe ₂ O ₅ : 47-1711, CaFe ₂ O _4: 32-0168).

As a result of the test, diffraction patterns attributable to CaFe ₂ O ₄ and Ca ₂ Fe ₂ O ₅ were confirmed to confirm that the activated carbon contained a calcium ferrite compound.

A gas filter was manufactured in the same manner as in Example 1, except that Example 1 used activated carbon containing the calcium ferrite compound instead of activated carbon.

<Comparative Example>

Gas filter was manufactured in the same manner as in Example 1, except that in Example 1, instead of aluminum lath, a high-density polyethylene plastic mesh (3 mm mesh space, Apex Industries, Ltd.) was used.

<Test Example>

Pass the gas fluid having a sulfur dioxide concentration of 200 ppb through the prepared filter at a flow rate of 2 m / s, measure the sulfur dioxide concentration of the filtered gas, and ventilate for 4 hours to vent the pressure loss of the fluid and ventilate for 240 hours in the filter. A test was conducted to observe the shape of the gas filtration media.

The sulfur dioxide reduction rate of the gas filtered in the test was measured to be 61.5% in Example 1, 99.2% in Example 2, and 58.4% in Comparative Example.

In addition, the gas fluid pressure loss of Example 1 and Example 2 was evaluated to 100Pa or less, and it was confirmed that the shape of the gas filtration media did not change even after 240 hours of ventilation.

On the other hand, in the gas filtration media according to the comparative example, the plastic mesh was broken while the bending angle was increased, and the support strength was weak, so that the adsorption material was desorbed as the gas filtration media was severely shaken during ventilation.

As a result of the above test, the gas filtration media according to the present invention can reduce the pressure loss of the fluid when the gas filtration media is bent and inserted into the filter case while ventilating the gas filtration media while removing harmful gases. It was confirmed that it has excellent characteristics that are maintained as it is.

Claims (9)

Between the nonwoven fabric is filled with an adsorbent material having a function of filtering harmful gas and odor gas, the aluminum lath in the middle of the adsorbent material interposed in parallel with the nonwoven fabric,
The aluminum lath has an opening shape of a honeycomb shape or a diamond shape, and when the shape of the opening shape is a honeycomb shape, the length of the short width of the opening is 3 to 6 mm and the length of the long width of the opening is 5 to 10 mm. The gas filtration media of which the length of the short width of the opening is 1 to 12 mm and the length of the long width of the opening is 3 to 22 mm when the shape of the shape is diamond. delete The method of claim 1,
The adsorbent material is at least one selected from the group consisting of activated carbon, impregnated activated carbon, activated carbon including calcium ferrite compound, metal medicine and catalyst. The method of claim 3, wherein
Activated carbon containing the calcium ferrite compound is a gas filtration, characterized in that produced by mixing at 1100 ~ 1200 ℃ after mixing the same amount of coal ash and coal adjusted to a molar ratio of calcium / iron contained in the coal ash to 1.0 ~ 3.0 media. The method of claim 1,
The adsorbent material is at least one selected from the group consisting of crushed, columnar and spherical in shape, the particle size of the adsorbent material is characterized in that the gas filtration media 16 to 100 mesh. The method of claim 1,
The nonwoven fabric is made of polyester, and the gas filtration media, characterized in that produced by the spunbond or heat fusion method. The method of claim 1,
The thickness of the aluminum lath is 0.3 ~ 1.0 mm and the weight of the adsorption material is 400 ~ 1500 g / m ² , the basis weight of the nonwoven fabric is characterized in that the gas filtration media is 15 ~ 70 g / m ² . After adhering an adhesive to the surface of the nonwoven fabric and attaching an adsorbent material having a function of filtering toxic gas and odor gas thereon, the two nonwoven fabrics having the adsorbed material attached to each other face the surface where the adsorbent material is present and the aluminum lath in between. It is manufactured by interposing and attached using a compression roller,
The aluminum lath has an opening shape of a honeycomb shape or a diamond shape, and when the shape of the opening shape is a honeycomb shape, the length of the short width of the opening is 3 to 6 mm and the length of the long width of the opening is 5 to 10 mm. The length of the short width of the opening is 1 to 12 mm and the length of the long width of the opening is 3 to 22 mm when the shape of the diamond is diamond-shaped. The method of claim 8,
Wherein said adhesive is hot melt-rubber or hot melt-olefin.