KR102502447B1 - Air purificaiton device with filter for adsorbing volatile organic compounds - Google Patents

Abstract

The present invention relates to an air purifier equipped with a filter for adsorbing volatile organic compounds, wherein the filter for adsorbing volatile organic compounds comprises the steps of (a) preparing a mixed powder by mixing carbon powder and clay mineral powder; (b) Preparing a dough by adding a binder and a dispersing solvent to the mixed powder and then wet-mixing the dough, (c) extruding the dough to prepare a molded body, (d) drying the molded body, and (e) ) As a filter manufactured by the step of sintering the molded body, it is possible to improve adsorption performance and regenerate by preparing a filter that can be directly applied using raw materials, thereby reducing costs and enhancing environmental friendliness.

Description

Air purificaiton device with filter for adsorbing volatile organic compounds}

The present invention relates to an air purifier equipped with a filter for adsorbing volatile organic compounds (VOC), wherein the filter is a filter for adsorbing and filtering volatile organic compounds among polluted components contained in the air, and includes carbon powder components. It is an activated carbon molded filter prepared in a certain shape by direct extrusion molding.

There are many substances harmful to the human body contained in the air, but VOC (Volatile Organic Compounds), which account for the most proportion, directly reacts to the human body, causing very strong adverse effects when exposed for a long time. It also becomes a causative substance of ozone and smog through photochemical reactions and is the main cause of deteriorating the atmospheric environment.

In addition, due to the recent increase in chemical gases emitted from factories, etc. through extreme industrial development, automobiles, etc., various exhaust gases generated and emitted from burning fossil fuels in engines, the main engine of automobiles, and food The variety of VOC-type gases generated during production is gradually increasing.

Since the deterioration of the environmental air sector gradually increases, there are many predictions that it will affect the atmospheric environment and the future environment, and accordingly, internationally, treaties to prevent this through agreements between countries are in progress. Efforts to reduce it by using various social campaigns are gradually increasing.

On the other hand, despite these efforts, people who live close to the city cannot avoid the effects of the many effects of urban development, and even when buying a new house or car, various rare phenomena called sick house syndrome or new car syndrome occur. It is a social problem.

Accordingly, each industry is producing public cleaning devices or air conditioning devices to remove gaseous pollutants generated in this way, and socially, 'Special Act on the Reduction and Management of Fine Dust', 'Indoor Air Quality Management Act', 'Facility Standards of Buildings', etc. It is compulsory to manage indoor air quality through various methods such as 'Regulations on Seoul Metropolitan Government' and 'Notification of Standards for Green Building Facilities in Seoul'.

Among them, the Clean Air Conservation Act and the Odor Prevention Act require systematic emission regulation, and accordingly, emissions from printing facilities, automobile and ship painting facilities, textile dyeing facilities, paint manufacturing facilities, oil depots, and chemical processing facilities are released into the atmosphere. The permissible emission limit of discharged volatile organic compounds is notified as less than 50 ppm, and VOC reduction facilities are required.

In this situation, various methods have been proposed due to efforts to gradually treat volatile organic compounds at higher levels, but this is also a problem to be solved due to non-environmental results such as using a disposable filter.

In particular, in a conventional air purifier, for the purpose of filtering volatile organic compounds, activated carbon and catalytic metal components are formed in the form of pellets, and a honeycomb metal mesh is used to isolate them at regular intervals. A method of fixing it by putting it in a certain ratio or by sticking it to the surface of a nonwoven fabric or mesh type pre-filter has been used. However, in the case of the air purifier as described above, the specific surface area is relatively small, so the processing speed of contaminated air is slow, and activated carbon or catalytic metal powder is generated due to friction between pellets in physical motion such as vibration to create new pollutants. There was a problem.

Korean Patent Publication No. 10-2018-0083234 Korean Patent Publication No. 10-2012-0085079 Korean Patent Publication No. 10-2008-0098114

In order to solve the above problems, the present invention is a method of manufacturing activated carbon or catalytic metal in the form of pellets in a filtering device and inserting or fixing it into a support when filtering air containing volatile organic compounds due to air pollution. It is an independent structure that can directly extrude the carbon powder component to form a certain shape, increase the specific surface area so that it can contact and process a lot of air at the same time, dramatically improve its efficiency, and occupy a certain position without a support. It is to provide an air purifying device including an adsorption filter made to be separated and applied.

The object of the present invention is not limited to the object mentioned above. The objects of the present invention will become more apparent from the description that follows, and will be realized by means and combinations thereof set forth in the claims.

The present invention is an adsorption filter for volatile organic compounds, which is molded and manufactured in the form of a structure with interconnected pores and a high specific surface area so that it can be used immediately by using raw materials of carbon powder. It is easy, increases the deodorization efficiency, extends the lifespan of the filter, dramatically reduces the loss of powder through friction between materials or impact, and allows it to be used again without being discarded through the regeneration process, thereby increasing efficiency but reducing cost. It is to provide an air purifying device having an adsorption filter having a structure capable of doing so.

The volatile organic compound adsorption filter of the present invention is a carbon powder filter, and may be provided at least one on the air inlet and air outlet of the air purifier, in detail, on the air flow path of the air inlet and air outlet. Such a filter comprises 20 to 60% by weight of carbon powder, preferably 30 to 50% by weight, most preferably 35 to 45% by weight, and 40 to 40 to 40% by weight of one or more clay mineral powders selected from the group consisting of paligorscite and kaolin. 80% by weight, preferably 50 to 70% by weight, most preferably 55 to 65% by weight of mixed powder, but may be integrally formed by extrusion molding, wherein the filter has a plurality of ventilation holes It may be in the form of a film or foam, and may have a shape and structure such as honeycomb.

The filter may further include 1 to 20 parts by weight of a binder, preferably 5 to 15 parts by weight, and 50 to 70 parts by weight of a dispersion solvent, preferably 55 to 65 parts by weight, based on 100 parts by weight of the mixed powder. there is.

Hereinafter, the components of the carbon powder molded filter provided in the air purifier of the present invention will be described in detail.

Carbon powder serves to physically adsorb and remove odor components with numerous pores on the surface, and at least one selected from the group consisting of activated carbon, activated carbon fibers, charcoal, carbon nanotubes, graphite and carbon black, preferably Preferably, it may be activated carbon. Here, the average particle diameter of the carbon powder may be 1 to 40 μm, preferably 20 to 30 μm. If the average particle diameter of the carbon powder is less than 1 μm, power consumption is large because the load during the suction process is large when applied to the filter, and the life span of equipment such as air purifiers can be shortened, and if it exceeds 40 μm, the suction process Although the permeability of the air is increased, the filtering and adsorption effect may be reduced, which is undesirable. When the average particle diameter of the carbon powder is within the above range, the iodine adsorption capacity may be 600 to 1200 mg/g.

The carbon powder may be included in an amount of 20 to 60% by weight, preferably 30 to 50% by weight, and most preferably 35 to 45% by weight. If the carbon powder content is less than 20% by weight, the porosity of the filter may decrease and adsorption properties may be deteriorated, and if the carbon powder content exceeds 60% by weight, durability and mechanical properties may be deteriorated, which is undesirable.

The clay mineral powder has a high specific surface area to improve the adsorption performance of activated carbon, and can enhance the formability enhancement effect during molding due to the unique performance of the clay mineral. The clay mineral powder may be a mixture of paligorscite and kaolin in a weight ratio of 0.5 to 1.5:1, preferably 0.8 to 1.2:1. If the mixing ratio of paliggorskite and kaolin is less than 0.5:1 by weight or greater than 1.5:1, adsorption performance may deteriorate.

The Palygorskite is a 2: 1 clay mineral produced in the form of needles. It has a tunnel structure by the chain structure of tetrahedrons of silicate and contains water molecules in the tunnel, and the chemical formula is [Si ₈ Mg ₂ Al ₂ O ₂₀ (OH) ₂ (OH) ₂ 4H ₂ O]. In addition, commercially available products such as attapulgite can be purchased and used.

The kaolin is the most representative clay mineral, and the unit structure has a structure in which a silicic acid tetrahedral layer and an alumina octahedral layer are 1: 1, and three types of kaolinite, dickite, and nacrite structures are different. It may contain halloysite to which minerals and interlayer water are added. The chemical formula of the three minerals other than halloysite is [Al ₂ Si ₂ O ₅ (OH) ₄ ] or [Al ₂ O ₃ .2SiO ₂ .2H ₂ O], and the weight % of the oxide is SiO ₂ , 46.5%; Al ₂ O ₃ , 39.5%; H ₂ O, 14.0%, has the most consistent composition among clay minerals.

The clay mineral powder may be included in an amount of 40 to 80% by weight, preferably 50 to 70% by weight, and most preferably 55 to 65% by weight. If the amount of clay mineral powder is less than 40% by weight, the clay component may decrease and moldability may deteriorate during molding, and if it exceeds 80% by weight, the content of carbon powder is relatively reduced, resulting in poor adsorption efficiency for harmful substances and contaminants. it can be done

The binder is a material that serves to ensure that the dough of carbon powder and clay mineral powder is uniformly stable and well bound, and is composed of carboxymethyl cellulose (CMC), methyl cellulose (MC), and It may be at least one selected from the group consisting of hydroxypropyl methylcellulose (HPMC), preferably methyl cellulose (MC), but is not limited thereto, and in addition to the above-mentioned binder, polyvinyl butyral ( An organic binder such as polyvinyl butyral) or an inorganic binder such as barium carbonate (BaCO ₃ ) may be additionally added and mixed as necessary.

The binder may be added in an amount of 1 to 20 parts by weight, preferably 5 to 15 parts by weight, based on 100 parts by weight of the mixed powder. If the amount of the binder is less than 1 part by weight, bonding between the mixed powders may be insufficient and durability may be deteriorated, and if the amount of the binder exceeds 20 parts by weight, it may be difficult to evenly disperse the carbon powder and the clay mineral powder. When the content of the binder is within the above range, the carbon powder and the clay mineral powder can be more effectively combined.

The dispersion solvent is 1 selected from the group consisting of purified water, methanol, ethanol, glycerin, ethyl acetate, butylene glycol, and propylene glycol. More than one species, preferably purified water, can be used, but is not limited thereto, and different types may be applied depending on the type of binder. The dispersion solvent may be added in an amount of 50 to 70 parts by weight, preferably 55 to 65 parts by weight, based on 100 parts by weight of the mixed powder. If the dispersion solvent is less than 50 parts by weight, it is difficult to evenly disperse the carbon powder and clay mineral powder, and if it exceeds 70 parts by weight, it may be difficult to maintain shape retention during filter manufacture.

Hereinafter, with reference to FIG. 1, a method of manufacturing a carbon powder molded filter provided in the air cleaning device of the present invention will be described. Since the contents and reasons for limitation of each component of the carbon powder filter for air purifiers have been described in detail above, they will be omitted.

First, a mixed powder is prepared by mixing carbon powder and clay mineral powder.

20-60% by weight of carbon powder, preferably 30-50% by weight, most preferably 35-45% by weight and 40-80% by weight of clay mineral powder, preferably 50-70% by weight, most preferably 55-45% by weight A mixed powder can be prepared by mixing at 65% by weight. At this time, the carbon powder uses any one equipment selected from a ball mill, an attrition mill, a jet mill, a rotary mill, and a vibration mill. Thus, the carbon powder may be pulverized to have an average particle diameter of 1 to 40 μm, preferably 20 to 30 μm. By performing such a grinding operation, the surface area is widened, so that the efficiency of adsorption and removal of harmful substances from the air can be further improved, and the iodine adsorption capacity can be in the range of 600 to 1200 mg/g. The carbon powder may be at least one selected from the group consisting of activated carbon, activated carbon fibers, charcoal, carbon nanotubes, graphite, and carbon black, preferably activated carbon.

Clay mineral powder is a mixture of at least one selected from the group consisting of paligorscite and kaolin, preferably at a weight ratio of 0.5 to 1.5: 1, preferably 0.8 to 1.2: 1. It may be, and a grinding operation may be performed to have an average particle diameter of 1 to 50 μm.

Next, after adding a binder and a dispersing solvent to the mixed powder, wet mixing is performed to prepare dough.

Based on 100 parts by weight of the mixed powder prepared in the mixed powder preparation step, 1 to 20 parts by weight of a binder, preferably 5 to 15 parts by weight of a binder, and 50 to 70 parts by weight of a dispersion solvent, preferably 55 to 65 parts by weight Dough may be prepared by adding and then wet mixing using a mixer.

After that, the dough is molded to produce a molded body.

The dough prepared in the wet mixing step may be molded by any one method selected from extrusion molding using a mold, laser processing, press mold, and injection processing, preferably manufactured in a predetermined filter shape. A molded body can be manufactured by an extrusion molding method using a mold. At this time, the molded body may be in the form of a film or form in which a plurality of ventilation holes are formed, and may be honeycomb, fiber, lattice or corrugate, preferably honeycomb. It can be manufactured to have a shape and structure. In addition, the size of the molded body may be manufactured to be 30 to 50 mm in width and 50 mm in length, preferably 35 to 45 mm, and 5 to 15 mm in thickness, preferably 8 to 12 mm in thickness.

When the molded body manufactured in the shape and shape as described above is applied to an air purifier, the specific surface area of the carbon powder is large, and the ability to adsorb odor components and contaminants such as bacteria, viruses, molds, fine dust, and odors can be excellent. In this way, the adsorbed harmful substances are adsorbed into the micropores to maintain a physically stable state, and the deodorization efficiency can be increased.

Then, the molded body is dried.

The molded body manufactured in the dough molding step is dried at a temperature of 30 to 120 ° C, preferably 40 to 70 ° C and humidity of 20 to 70 ° C using equipment such as hot air drying, heat drying, natural drying (room temperature drying) or constant temperature and humidity dryer. Drying may be performed at 70%, preferably 30 to 50%. If the drying temperature is less than 30 ° C, the time required for drying is long and work efficiency may be low, and if it exceeds 120 ° C, manufacturing costs may increase due to higher temperature conditions than necessary. Preferably, the time can be adjusted according to the formulation of the molded article.

Finally, the molded body is fired.

In the step of drying the molded body, the dried molded body is fired at a temperature of 400 to 700 ° C, preferably 500 to 600 ° C. . If the firing temperature is less than 400 ° C, the mechanical properties of the molded article may be poor due to incomplete sintering, and if it exceeds 700 ° C, the pore air permeability of the activated carbon may be reduced due to excessive particle growth, and thus the adsorption performance may be deteriorated. It is preferable to perform firing within the range.

If the heating rate is less than 1.0 ° C / min, it takes a long time to reach the sintering temperature, and productivity may be low. The quality of the filter may deteriorate due to the occurrence of cracks.

In addition, the firing may be performed in an inert gas atmosphere such as nitrogen (N ₂ ), argon (Ar), or helium (He), or may be performed in an air (air) or oxygen (O ₂ ) atmosphere.

When the firing is completed as described above, the carbon powder molded filter of the present invention can be obtained. The carbon powder molded filter for an air purifier of the present invention manufactured by the manufacturing method as described above can be used by combining at least one in the form of a film, foam, or honeycomb, and preferably by combining 70 to 90 sheets. It can be used, but is not limited to the longevity mentioned above.

The carbon powder molded filter provided in the air purifier of the present invention can be reused by removing harmful gases, that is, volatile organic compounds, adsorbed to the carbon powder molded filter by hot air drying rather than having to be replaced like conventional filters.

The hot air drying of the carbon powder molding filter adsorbed with the harmful gas is 90 to 150 ° C, preferably 100 to 150 ° C, more preferably 100 to 140 ° C, even more preferably 100 to 130 ° C, most preferably 110 to 130 ° C. for 18 hours or more, preferably 18 to 100 hours, more preferably 18 to 80 hours, still more preferably 18 to 72 hours, and most preferably 24 to 72 hours. If the above-mentioned temperature and time conditions are not satisfied, harmful gases such as ammonia, formaldehyde, and toluene may not be desorbed from the carbon powder molded filter, and it may be difficult to achieve a harmful gas removal efficiency of 90% or more when reused.

Since the carbon powder molded filter can be semi-permanently regenerated and used through the above-mentioned regeneration method, filter replacement costs can be reduced.

The air purifying device of the present invention includes any one selected from the group consisting of a pre-filter (50), a medium filter (80), a HEPA filter (60), an ion filter (70), and a photocatalyst filter (90) in addition to the aforementioned carbon powder molded filter. It may include a structure such as one filter, a module having two or more of these filters, or a UV light source 91.

The pre-filter 50 refers to a mesh structure or non-woven fabric filter filtering coarse particles (animal hair, lint, hair, large dust, etc.) contained in the air.

The HEPA filter 60 refers to a filter that physically filters fine dust (size of 0.3 μm or more) contained in the air.

The medium filter 80 is a filter having higher filtering efficiency than the pre-filter but lower than the HEPA filter, and may be used instead of the pre-filter or the HEPA filter or provided between the pre-filter and the HEPA filter.

In addition, the pre-filter 50, the HEPA filter 60, and the medium filter 80 may include only one of them.

The ion filter 70 refers to a filter that chemically decomposes and filters VOCs contained in the air so as not to be harmful.

The UV light source 91 is for killing harmful bacteria and viruses contained in the air.

The photocatalyst filter 90 is a filter containing a photocatalyst, which decomposes or adsorbs VOCs contained in the air by the photocatalyst and filters them.

As an example, the photocatalytic filter may be a conventional filter, but may be a photocatalytic filter filed by the present applicant in Patent Application No. 10-2020-0143265. Therefore, this specification may include the contents described in the patent application, and the photocatalytic filter of the present applicant is referred to as a photocatalyst module in this specification for convenience.

More specifically, as shown in FIG. 2 , the photocatalytic module 150 includes a housing 100 forming a circumferential surface of the photocatalytic filter and a light reflecting plate 120 sequentially installed inside the housing in the direction of air flow. ), a light source supporting plate 120, a light scattering body 130, and a photocatalyst material supporting body 140. Here, the meaning of air means air containing noxious gas, and as shown in FIG. 2, the flow of air moves from the right side of the drawing to the left side.

The photocatalyst material support 140 is installed on one side of the housing 100 corresponding to the most downstream in the air flow direction, and has a plurality of through holes 141 formed thereon, and a photocatalyst material is coated on the surface.

Examples of the photocatalytic material include TiO ₂ (anatase), TiO ₂ (rutile), ZnO, CdS, ZrO ₂ , SnO ₂ , V ₂ O ₂ , WO ₃ , and perovskite-type composite metal oxide (SrTiO ₂ ).

As a specific example, the photocatalyst material support is made into ultra-fine particles, mixed with an inorganic binder, prepared in a liquid form to form a high-hardness, acid-resistant transparent film, applied to supports of various shapes, and subjected to a predetermined curing process. It can be coated on and used as a photocatalytic material used in a photocatalytic filter.

As one specific example, the photocatalyst material support preferably adopts a corrugated structure, a corrugated structure, or a corrugated structure in which ribs and crests are repeated as the photocatalyst material support so as to have a large specific surface area.

A through hole 141 through which air passes is formed in the photocatalyst material support 140, and the cross section of the through hole 41 may have various shapes such as a square, a hexagon, a rhombus, and a circle. As described above, the photocatalyst material is coated on the wall surface surrounding the through hole 141 having various shapes, that is, the surface of the photocatalyst material support, so that harmful substances in the air passing through it are removed by the photocatalytic action.

The light source support plate 120 is installed on the other side of the housing 100 corresponding to the current in the air flow direction, and a plurality of light sources 121 radiating light in the direction of the photocatalyst material support 140 are fixed.

In the case of a photocatalyst using titanium oxide, the band gap of anatase-type titanium oxide is known to be 3.2eV, so when the energy that can give the same energy is converted into light wavelength using this, it is 380nm, which is light with a wavelength shorter than 380nm, that is, ultraviolet light. (UV:Ultraviolet ray), the effect can be obtained, so it has a lot of dependence on the light wavelength. Therefore, when titanium oxide is used as a photocatalytic material, the light source 121 may be a UV lamp having a wavelength shorter than 380 nm, a UV LED, or other UV light emitters.

The light scattering body 130 is installed between the photocatalyst material support 140 and the light source supporting plate 120, and a plurality of light scattering spheres 131 are embedded therein to scatter the light emitted from the light source 121. .

In FIG. 2 , one layer of the light scattering body 130 is illustrated, but it is not limited thereto, and a plurality of layers may be overlapped depending on the number of light sources, the number or volume of scattering spheres, the size of the housing, and the like. there is.

The light scattering sphere 131 embedded in the light scattering body 130 may have various materials and various shapes. For example, the light scattering sphere 131 is formed of a glass material and has a spherical shape, a glass rod having a shape other than a spherical shape, a spherical glass sphere having a central portion penetrating, and a penetrating glass sphere. Any of the glass rods may be applied. In addition, the light scattering sphere 131 is formed of a quartz material, and any one of a quartz sphere having a spherical shape, a quartz rod having a shape other than a spherical shape, a through-type quartz sphere, and a through-type quartz rod is applied. can

In the light source 121, the light spreads radially from the point-shaped light emitting body, but the surface of the photocatalyst material support configured to have a large specific surface area is not evenly used. Therefore, the light scattering body 130 is installed between the photocatalyst material support 140 and the light source 121 so that more of the surface of the photocatalyst supporter can be used. ) has the advantage of increasing the photocatalytic effect in the end due to irradiation or exposure to more surfaces.

The photocatalytic module 150 may further include a light reflector 110 to further enhance the photocatalytic effect described above.

The light reflecting plate 110 is installed on one side (right side in the drawing) of the light source supporting plate 120 so as to be positioned at a current higher than the light source supporting plate 120 in the air flow direction. The light reflecting plate 110 has an inlet hole 111 through which air is introduced, and serves to reflect light irradiated in a reverse direction by the light scattering body 130 toward the photocatalyst material support 140 . That is, the light irradiated from the light source by the light reflector 110 is irradiated or exposed to more surfaces of the photocatalyst material support 140, so that the photocatalytic effect can eventually be enhanced.

As one specific example, the air purifier according to the present invention having the above-described filter and structure may be configured with the structure and arrangement shown in FIGS. 3 and 4 .

Specifically, Figure 3 is an example of an air purifying device according to the present invention, an air inlet 10 capable of sucking air from the outside, a blower fan 30 configured to use physical pressure to introduce air, or A one-way fan 200, a pre-filter 50 or medium filter 80 of a mesh structure or non-woven fabric structure capable of filtering coarse particles from the outside contained in the inlet air, and fine dust contained in the inlet air A HEPA filter (60) or a medium filter (80), a carbon powder filter (40) for adsorbing and filtering out VOCs contained in the inlet air, and an ion filter that chemically decomposes VOCs in the inlet air in a harmless manner. (70), a photocatalyst filter (90), or a photocatalyst module (150), a UV light source (90) for killing bacterial substances contained in the inlet air, an opening/closing structure damper for controlling the flow of air, and purification through various filters It may be composed of an air outlet 20 capable of expelling the filtered air, an air passage 92 leading to the outlet through various filters and fans at the inlet, and the like. Also, a filter module in which two or more of the above filters are manufactured as a single structure may be included.

Further, specifically, FIG. 4 is an example of an air purifying device according to the present invention. The air purifying device does not inhale, treat, or discharge only air in a certain space, that is, indoor air, but air in another space, that is, outdoor air. It may be composed of a device capable of sucking in air and ventilating it. That is, the outdoor inlet (OA; Out Air) 11 that sucks in the outdoor air, the damper 93 that blocks or opens the outdoor inlet, and the fine dust, VOC, and bacterial substances contained in the sucked outdoor air. Filters or filter modules such as a pre-filter (50), a medium filter (80), a HEPA filter (60), an ion filter (70), a photocatalyst filter (90), and a photocatalyst module (150) that can be treated, from outdoors to indoors A blower fan for indoor intake (32) that provides pressure to send air to the room, an indoor outlet (SA: Supply Air) (12) configured to send purified air through a filter to the room, and a blocking indoor outlet A damper (93) that can be opened or closed, an indoor inlet (RA; Room Air) (12) that sucks old polluted air in the room, a damper (93) that can block or open the indoor inlet, and the indoor inlet A HEPA filter (60) or a medium filter (80) of a non-woven fabric structure capable of trapping particles contained in the air sucked in through, a blower fan (31) for indoor exhaust that provides pressure to send air from the inside to the outside, EA (Exaust Air) (12) that can discharge indoor air to the outside, a damper (93) that can block or open the outdoor outlet, and the cooling energy of the indoor air that is wasted when the indoor air is released to the outside Alternatively, it may be configured with a heat exchanger 95 that temporarily deprives heating energy and returns the energy deprived of indoor air so that the outdoor air has a similar temperature to the original indoor air when outdoor air is brought into the interior.

The air purifier equipped with a carbon powder molded filter according to the present invention has a simple structure by including a carbon powder molded filter manufactured to be applied immediately, and since the filter replacement cycle can be extended, the life characteristics of the filter are improved and at the same time It has the advantage of reducing costs.

In addition, the carbon powder molded filter provided in the air purifier of the present invention improves the adsorption performance of activated carbon by using paligorskite and kaolin, which have a high specific surface area as clay mineral powder, and has a unique clay mineral performance. It has the advantage of increasing the sexual enhancement effect.

In addition, since the carbon powder molded filter provided in the air purifier of the present invention can be recycled and used, filter replacement costs can be reduced and environmental pollution due to waste reduction can be prevented.

The effects of the present invention are not limited to the effects mentioned above. It should be understood that the effects of the present invention include all effects that can be inferred from the following description.

1 is a process chart for explaining a manufacturing method of an adsorption filter provided in an air purifier of the present invention.
2 is a diagram showing the structure of a photocatalyst module that may be included in the air purifying device of the present invention.
3 is a view showing a structure of an air purifier according to an embodiment of the present invention.
4 is a view showing a structure of an air purifier according to an embodiment of the present invention.
5 is a diagram showing the results of an experiment on deodorization efficiency of a carbon powder molded filter according to an embodiment of the present invention.
Figure 6 is a view showing the results of the deodorization efficiency test of the conventional pellet-type activated carbon filter according to an embodiment of the present invention.
7 is a diagram showing an apparatus used in Experimental Example 3 according to an embodiment of the present invention.
8 is a diagram showing the results of an acetaldehyde removal efficiency test of an air purifier according to an embodiment of the present invention.
9 is a view showing the results of toluene removal efficiency test of an air purifier according to an embodiment of the present invention.
10 is a view showing the results of a formaldehyde removal efficiency test of an air purifier according to an embodiment of the present invention.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and the spirit of the present invention will be sufficiently conveyed to those skilled in the art.

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited by the following examples.

Example 1. Manufacturing carbon powder molded filter

10 g of methylcellulose and 61 g of purified water were added to a mixture of 45 g of activated carbon powder having an average particle diameter of 25 μm, 25 g of paligorgite powder, and 30 g of kaolin powder, and then wet mixed to prepare a dough. . The dough was extruded using a mold to have a honeycomb structure and shape, dried at 100 ° C using a constant temperature and humidity dryer, and then fired at 550 ° C to prepare a carbon powder molded filter. Carbon powder The molded filter was manufactured with a width of 40 mm X a length of 40 mm X a thickness of 10 mm.

Example 2. Filter manufacturing

A carbon powder molded filter was prepared in the same manner as in Example 1, except that a mixture of 40 g of activated carbon powder, 30 g of paligorsky powder, and 30 g of kaolin powder having an average particle diameter of 25 μm was used.

Comparative Example 1. Preparation of Pellet Type Activated Carbon Filter

It was prepared in the same manner as in Example 1 except that it was molded into a pellet shape.

Comparative Example 2. Filter Manufacturing

A filter was prepared in the same manner as in Example 1, except that activated carbon having an average particle diameter of 50 μm was used.

Comparative Examples 3 to 9. Filter Preparation

A filter was prepared in the same manner as in Example 1, except for mixing in the component ratios shown in Table 1 below.

division activated charcoal powder clay mineral powder falgor skye kaoline Comparative Example 3 15 28 57 Comparative Example 4 20 60 20 Comparative Example 5 45 13 42 Comparative Example 6 50 40 10 Comparative Example 7 70 25 5 Comparative Example 8 75 4 21 Comparative Example 9 80 10 10

Comparative Examples 10 to 14. Filter Preparation

A filter was prepared in the same manner as in Example 1, except that drying and firing were performed under the temperature conditions shown in Table 2 below.

division Drying temperature (℃) Firing temperature (℃) Comparative Example 10 25 660 Comparative Example 11 200 580 Comparative Example 12 50 320 Comparative Example 13 60 850 Comparative Example 14 70 1000

Experimental Example 1. Evaluation of deodorization efficiency according to the structure of the filter

In order to evaluate the removal efficiency of the filter according to Example 1 and Comparative Example 1 for five harmful gases (ammonia, acetic acid, acetaldehyde, toluene, and formaldehyde), measurements were requested to Dongkwang Envi Chemical Research Institute.

First, 80 filters of Example 1 made of 40 mm in width X 40 mm in length X 10 mm in thickness were attached to 320 mm in width and 400 mm in length, mounted on an actual air purifier, and the initial gas concentration was measured. Then, after operating the chamber (8 m 2 ) containing the target gas for 30 minutes, the gas concentration was measured again to calculate the harmful gas removal efficiency. The results are shown in Figures 5 and 6.

5 is a view showing the experimental results according to Example 1 in Experimental Example 1, and FIG. 6 is a view showing the experimental results according to Comparative Example 1 in Experimental Example 1.

5 and 6, the deodorization efficiency of Comparative Example 1 was only 81.13%, whereas the deodorization efficiency of Example 1 was 91.52%, which was higher than that of Comparative Example 1. Accordingly, it was confirmed that the method of manufacturing activated carbon in a filter form using raw materials is more effective in removing harmful gases such as ammonia, acetic acid, and toluene than the method of manufacturing activated carbon in a pellet type and inserting and fixing it in a support.

Experimental Example 2. Evaluation of deodorization efficiency

In order to evaluate the harmful gas removal efficiency according to the mixing ratio of the mixed powder and the drying and firing temperature conditions, the experiment was conducted in the same manner as in Experimental Example 1, and the average removal rate results for the five materials are shown in Table 3 below.

division Initial (ppm) After 30 minutes (ppm) Deodorization efficiency (%) Example 2 10 0.98 90.20 Comparative Example 2 1.25 87.50 Comparative Example 3 2.55 74.50 Comparative Example 4 2.35 76.50 Comparative Example 5 1.81 81.90 Comparative Example 6 1.30 87.00 Comparative Example 7 0.68 93.20 Comparative Example 8 0.58 94.20 Comparative Example 9 0.37 96.30 Comparative Example 10 0.99 90.10 Comparative Example 11 0.89 91.10 Comparative Example 12 1.24 87.60 Comparative Example 13 1.96 80.40 Comparative Example 14 2.15 78.50

Referring to Table 3, it was confirmed that Example 2 showed superior deodorization efficiency compared to Comparative Examples. Comparative Example 2 had low deodorization efficiency by using 50 μm activated carbon powder, and in particular, Comparative Examples 3 and 4 had low deodorization efficiency compared to other Comparative Examples because they included a small amount of activated carbon powder. In contrast, Comparative Examples 7 to 9 contained a large amount of activated carbon powder, and it could be confirmed that the deodorization efficiency increased with the amount of activated carbon powder. However, Comparative Examples 7 to 9 having a high activated carbon content had a problem in that the yield was reduced due to shape defects occurring during molding and drying, while the deodorization efficiency was high. In Comparative Examples 11 and 14 compared to Examples 1 and 2, the deodorization efficiency according to the firing temperature was confirmed, and it was confirmed that the deodorization efficiency decreased as the drying temperature or firing temperature increased.

Experimental Example 3. Air volume measurement

As shown in FIG. 7, air purifiers equipped with filters according to Example 1 and Comparative Example 1 were installed in the air inlet of the device and an air volume test was performed.

The air volume test was conducted according to Annex 1 of KSC 9304 by operating the air purifier at rated frequency and rated voltage. That is, an appropriate connection was made so that there was no air leakage, and the measurement was performed while exchanging the orifice or nozzle according to the air volume, and the results are shown in Table 4 below. Here, the control example is an air purifier not equipped with an activated carbon filter (Example 1) and a pellet type filter (Comparative Example 1).

division Example 1 Comparative Example 1 control example 1 stage 3.01 CMM 2.81 CMM 3.16 CMMs 2nd stage 3.96 CMM 3.65 CMM 4.16 CMMs 3rd 5.00 CMM 4.71 CMM 5.09 CMMs Turbo 6.11 CMMs 6.00 CMM 6.28 CMM

Referring to Table 4, it was confirmed that it was designed to support the required air volume even when a high air volume was required.

Experimental Example 4. Evaluation of Regeneration Characteristics of Filters

In order to confirm the regeneration characteristics of the filter according to Example 1, an experiment was conducted in the following manner.

First, 80 filters of Example 1 manufactured in a width of 40 mm X length of 40 mm X thickness of 10 mm are attached to a width of 320 mm and length of 400 mm and installed in an actual air purifier, and a chamber (8 m2) containing the target gas is operated to measure the gas concentration After the measurement was repeated 7 times for 30 minutes, the chamber (8 m 2 ) was operated (after the stress test), and the gas concentration was measured again. And after drying and regenerating the filter at 120 ℃ for 72 hours, the chamber (8㎡) is operated to measure harmful gases, and the chamber (8㎡) is operated by repeating 5 times for 30 minutes (after the stress test), and the gas concentration is again measured. was measured. Finally, after regenerating the filter by drying it at 120 ° C. for 24 hours, the chamber (8 m 2 ) was operated to measure harmful gases, and the calculated results are shown in Table 5, respectively.

division Removal efficiency (%) initial product after harsh test After 72 hours play after severe testing after 24 hours playing ammonia 90.91 54.5 90.00 66.67 90.00 formaldehyde 86.67 84.91 100.00 10.00 100.00 toluene 100.00 100.00 100.00 10.00 100.00 average 92.53 79.82 96.67 88.89 96.67 (ammonia + formaldehyde + toluene)/3

Referring to Table 5, it was confirmed that the harmful gas removal efficiency was recovered to 96.67% or more even after the filter was regenerated multiple times. Accordingly, it was found that the filter of the present invention can be used semi-permanently.

Experimental Example 5: Measurement of filter efficiency of an air purifier equipped with a carbon powder molded filter

In the air purifier having the structure shown in FIG. 3, the air purifier in which the VOC absorption filter is replaced with the carbon powder molded filter of Example 1 according to the present invention and the air purifier in which the pellet-type activated carbon filter of Comparative Example 1 is replaced The purification ability was compared.

Specifically, acetaldehyde, toluene, and formaldehyde were each introduced at a concentration of 10 ppm as gases to be filtered by the VOC adsorption filter in an 8M ³ sealed chamber. In the chamber prepared as described above, the air purifier equipped with the carbon powder molded filter of Example 1 and the air purifier equipped with the pellet-type activated carbon filter of Comparative Example 1 were placed in the prepared chamber, and the gas removal amount for filtering was measured by measuring the remaining gas amount for a certain period of time. The air purifier used was the same air purifier with the same performance, and the apparent volume ratio of activated carbon, which was the raw material used in the test, was twice as high as the pellet-type activated carbon filter compared to the carbon powder molded filter (carbon powder molded filter 350cm ³ , pellet-type activated carbon 716cm ³ ) was used, so the carbon powder molded filter used relatively less activated carbon. The amount of gas used in the test was detected using a gas detection tube.

As a result of this, the removal rates of acetaldehyde, toluene, and formaldehyde are shown in Tables 6 to 8 and FIGS. 8 to 10 below.

Acetaldehyde Gas Removal Rate Test Result time - removal rate 0 minutes 10 minutes 20 minutes 30 minutes 40 minutes Activated carbon - pellet type 0% 20% 30% 40% 40% Activated Carbon Forming Filter 0% 20% 40% 50% 50%

Toluene gas removal rate test result time - removal rate 0 minutes 10 minutes 18 minutes 22 minutes 26 minutes Activated carbon - pellet type 0% 50% 80% 90% 100% Activated Carbon Forming Filter 0% 80% 100% 100% 100%

Formaldehyde Gas Removal Rate Test Result time - removal rate 0 minutes 5 minutes 10 minutes 15 minutes Activated carbon - pellet type 0% 85% 95% 100% Activated Carbon Forming Filter 0% 85% 95% 100%

As can be seen from the above results, the same removal capacity was shown in the case of formaldehyde gas, but in the case of both acetaldehyde and toluene gas, the air purifier equipped with the activated carbon molded filter according to the present invention was equipped with a conventional pellet-type activated carbon filter. Compared to the purification device, it was found that the efficiency was high by showing the faster removal capacity.

Experimental Example 6: Measurement of photocatalyst module filter efficiency

NH ₃ gas was injected into a 1 cubic meter chamber to prepare an initial NH ₃ concentration of 10 ppm, and a 20 mm thick structure having 300 cells per square inch was prepared as a photocatalyst material support in this chamber. Mount TiO ₂ coated with sol-gel method. In addition, LEDs emitting UV light with a wavelength of 365 nm were configured in series/parallel as a light source for catalytic activity and measured by applying a rated voltage. In addition, by installing a blower with an air volume of 1.87 CMM per minute, NH ₃ gas is constantly passed between the photocatalyst material supports activated from the light source, and after a certain period of time, it is decomposed and evaluated by the amount of remaining NH ₃ to determine the NH ₃ removal rate. measured.

For comparison, as shown in FIG. 1, the light scattering body 130 and the light reflecting plate 110 were installed in the direction of the photocatalyst material support from the light source, and the light scattering body and the light reflecting plate were not installed. The results are shown in Table 9 below.

NH3 removal rate 10 minutes elapsed 20 minutes elapsed No light scatterer or light reflector 39% 45% Use of light scattering body and light reflector 60% 65% increase in removal rate 21%P. increase 20%P. increase

As shown in Table 9, when the light scattering body 130 and the light reflecting plate 110 were not present, the removal rate was 39% and 45% respectively after 10 minutes and 20 minutes, respectively, and the light scattering body 130 and the light reflecting plate 110 ), the removal rate increased, resulting in 60% and 65%, respectively.

Therefore, the dispersion of light through light scattering is increased, and the effect of the photocatalyst can be maximized because scattered light that can come out on the other side is sent back to the photocatalyst material support using the light reflector.

10: air inlet 11: outdoor side inlet
12: indoor side outlet
20: air outlet 21: outdoor side outlet
22: indoor exhaust port 30: blower fan
31: blower fan for indoor exhaust 32: blower fan for indoor intake
40: activated carbon shaping filter 50: pre-filter
60: HEPA filter 70: ion filter
80: medium filter 90: photocatalyst filter
91: UV light source 92: air passage
93: damper 95: heat exchange element
100: photocatalyst filter housing 110: light reflector
111: inlet hole 120: light source support plate
121: light source 130: light scattering body
131: light scattering sphere 140: photocatalyst material support
141: through hole 150: photocatalyst module

Claims (8)

An air purifier including at least one activated carbon molded filter provided on an air flow path of an air inlet and an air outlet of the air purifier,
The activated carbon molded filter is a clay mineral mixed with 35 to 45% by weight of carbon powder having an average particle diameter of 1 to 40 μm and an iodine adsorption capacity of 600 to 1200 mg/g, and palegorskite and kaolin in a weight ratio of 0.5 to 1.5: 1 It consists of a mixed powder in which 55 to 65% by weight of the powder is mixed, 1 to 20 parts by weight of a binder and 50 to 70 parts by weight of a dispersing solvent based on 100 parts by weight of the mixed powder, but integrally formed by extrusion molding and included in the air. An air purifier characterized in that for removing volatile organic compounds. The air purifier according to claim 1, wherein the activated carbon molded filter is in the form of a film, foam, or honeycomb having a plurality of air holes. The method of claim 1, wherein the activated carbon molded filter,
(a) Clay mineral powder 55 in which 35 to 45% by weight of carbon powder having an average particle diameter of 1 to 40 μm and an iodine adsorption capacity of 600 to 1200 mg/g is mixed with paligorscite and kaolin at a weight ratio of 0.5 to 1.5: 1 to 65% by weight to prepare a mixed powder;
(b) preparing a dough by adding 1 to 20 parts by weight of a binder and 50 to 70 parts by weight of a dispersing solvent to 100 parts by weight of the mixed powder and then wet-mixing;
(c) forming an integrally formed molded body by molding the dough;
(d) drying the molded body; and
(e) at least one inert gas atmosphere selected from the group consisting of nitrogen (N ₂ ), argon (Ar), and helium (He) at a temperature of 500 to 600 ° C. and a heating rate of 1.0 to 5.0 ° C./min; Or air (air) or oxygen (O ₂ ) step of firing under an atmosphere; air purifier characterized in that manufactured by a method comprising the. The air purifier according to claim 1, wherein the activated carbon shaped filter is regenerable by hot air drying. The air purifier according to claim 1, wherein the air purifier further comprises at least one filter selected from the group consisting of a pre-filter, a medium filter, a HEPA filter, an ion filter, and a photocatalytic filter in addition to the activated carbon molded filter. . The method of claim 5, wherein the photocatalytic filter,
a housing 100 forming a circumferential surface of the photocatalytic filter;
a photocatalyst material support 140 installed on one side of the housing 100 corresponding to the downstream side of the air flow direction, formed with a plurality of through holes 141 and coated with a photocatalyst material;
A light source support plate 120 installed on the other side of the housing 100 corresponding to the current in the air flow direction and having a plurality of light sources 121 radiating light toward the photocatalyst material support 140 are fixed; and,
The light scattering body 130 installed between the photocatalyst material support 140 and the light source support plate 120, and having a plurality of light scattering spheres 131 embedded therein to scatter the light irradiated from the light source 121. ); An air purifier comprising a. The air purifying device according to claim 1 or 4, wherein the air purifying device further includes a UV light source to sterilize microorganisms in the air. The air purifier according to claim 1, wherein the air purifier is an indoor air purifier or an air purifier for ventilation installed at a part connecting the indoor and outdoor areas of a building, office, or room.

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