Deodorizing filter and air purifier containing the same

Abstract

To provide a deodorization filter capable of efficiently removing a harmful gas having weak interaction with a gas adsorbent.SOLUTION: A deodorization filter is equipped with a first porous body having a plurality of pores where an oxidation catalyst or an oxidant is arranged so as to oxidize a gas and a second porous body having a plurality of pores. The first porous body contains a hydrophobic first adsorbent 5a having acid points. The second porous body contains a second adsorbent 5b composed of zeolite that adsorbs an oxidized gas generated while allowing the first adsorbent to pass through.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a deodorizing filter and an air purifying apparatus including the same, and more particularly, to a deodorizing filter having two adsorbents and an air purifying apparatus including the same.

[0002] 〔Related Art〕 This application claims priority under Article 4 of the Paris Convention based on Korean Patent Application No. 10-2021-0082310 (filing date: June 24, 2021), and the present invention is based on the contents disclosed in the Korean patent application. For reference, the contents of the specification, claims, and drawings of the Korean patent application are incorporated herein by reference. ​​​​​​​​​​​​​​​​​Japanese Patent No. 6568402 (B2: Patent Document 1) describes gas decomposition using a photocatalyst, but in order to achieve decomposition activity, it is necessary to secure a light source such as a black light and a light guide path to the photocatalyst such as a light guide plate, which presents a problem as it requires a complex apparatus configuration.

[0007] Japanese Patent No. 6417597 (B2: Patent Document 2) discloses a deodorizing device that uses a deodorizing filter containing a deodorizing material that includes a metal catalyst, porous ceramics, and at least one selected from the group consisting of activated carbon, zeolite, and diatomaceous earth. However, the aforementioned document is limited to gas decomposition catalysts and metal catalysts, which has the problem of narrowing the range of material selection.

[0008] Furthermore, in the examples, formaldehyde, which has low adsorption capacity, is completely decomposed by the metal catalyst manganese dioxide to improve removal efficiency. However, formaldehyde is a decomposition gas that decomposes in a relatively short time, and for gases that take a long time to decompose completely, such as toluene or alcohol, there is a problem that intermediate products of aldehydes are released. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent No. 6568402 [Patent Document 2] Japanese Patent No. 6417597 [Overview of the project] [Problems that the invention aims to solve]

[0010] The problem that this invention aims to solve is to provide a deodorizing filter that can efficiently remove harmful gases that have weak interactions with a gas adsorbent, and an air purifying device containing the same.

[0011] The problem that this invention aims to solve is to provide a deodorizing filter that can be easily applied to various air purification devices without changing their structure or design.

[0012] The problem that this invention aims to solve is to provide a deodorizing filter that can rapidly remove gas without generating intermediate products.

[0013] The problems addressed by the present invention are not limited to those mentioned above, and other problems not mentioned should be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0014] [One aspect of the present invention] In this invention, one aspect thereof is proposed as follows: [1] A deodorizing filter, A first porous body having multiple pores is provided, an oxidation catalyst or oxidizing agent is placed in the pores of the first porous body to oxidize a gas, the first porous body is hydrophobic, and a first adsorbent having acid sites is provided. A deodorizing filter comprising a second porous body having multiple pores, the second porous body being composed of a zeolite that adsorbs oxidizing gases generated as it passes through the first adsorbent, and a second adsorbent. [2] The deodorizing filter according to [1], wherein the average size of the plurality of pores formed in the first porous body is greater than or equal to the average size of the plurality of pores formed in the second porous body. [3] The deodorizing filter according to [1], wherein the first adsorbent and the second adsorbent are arranged in parallel on different filter substrates. [4] The deodorizing filter according to [1], wherein the first adsorbent is HY zeolite containing iodine pentoxide. [5] The deodorizing filter according to [1], wherein the first adsorbent is a HY zeolite having an SiO2 / Al2O3 ratio of 500 or more. [6] The deodorizing filter according to [4], wherein the HY zeolite containing iodine pentoxide is produced by mixing an aqueous solution of iodine pentoxide dissolved in ion-exchanged water with HY zeolite at room temperature and dehydrating it in an argon environment. [7] The HY zeolite containing the iodine pentoxide is 1) A wet mixing of iodine pentoxide, an aqueous solution dissolved in deionized water, and HY zeolite at room temperature, followed by drying for a first set time, 2) A step of partially dehydrating the dried powder produced in the drying process by heating it in an argon environment for a second set time that is longer than the first set time, 3) The deodorizing filter described in [4] is produced by further heating it in an argon environment for a third set time longer than the second set time to completely dehydrate it. [8] The HY zeolite containing the iodine pentoxide is In step 1) above, the drying process is carried out at a first set temperature. In step 2) above, partial dehydration is performed at a second set temperature that is higher than the first set temperature. In step 3) above, the deodorizing filter described in [7] is produced by completely dewatering at a third set temperature higher than the second set temperature. [9] The deodorizing filter according to [1], wherein the second adsorbent is NaY zeolite containing ethylenediamine.

[10] The second adsorbent is The deodorizing filter according to [9], wherein ethylenediamine monohydrate is added to ethanol and stirred at room temperature to make a deposit solution, and the deposit solution is wet-mixed with NaY zeolite at room temperature, and the resulting NaY zeolite containing 50 wt% ethylenediamine is used.

[11] An air purifier, Cases in which an intake port and an outlet port are formed, A fan is disposed inside the case and forms an airflow from the intake port to the discharge port, The case is equipped with a deodorizing filter, which is placed inside the case and removes malodorous gases from the flowing air. The deodorizing filter is provided with a first porous body having a plurality of pores, and an oxidation catalyst or an oxidizing agent is disposed in the pores of the first porous body so as to oxidize the gas. The first porous body comprises a first adsorbent that is hydrophobic and has acid sites, and a second porous body having a plurality of pores. The second porous body comprises a second adsorbent made of zeolite that adsorbs the oxidation gas generated while passing through the first adsorbent. An air purifying device. 〔12〕 The first adsorbent is disposed adjacent to the suction port rather than the second adsorbent. The second adsorbent is disposed adjacent to the discharge port rather than the first adsorbent. The air purifying device according to 〔11〕. 〔13〕 Further provided with an odor sensor disposed inside the case for sensing the concentration of malodorous gas in the flowing air. The odor sensor is disposed between the suction port and the deodorizing filter. The air purifying device according to 〔11〕. 〔14〕 Further provided with a control device for adjusting the rotational speed of the fan based on the concentration of malodorous gas sensed by the odor sensor. The air purifying device according to 〔13〕. 〔15〕 The control device increases the rotational speed of the fan as the concentration of malodorous gas sensed by the odor sensor becomes higher. The air purifying device according to 〔14〕. 〔16〕 A method for producing HY zeolite containing iodine pentoxide used in the deodorizing filter according to 〔4〕, comprising mixing iodine pentoxide with an aqueous solution dissolved in ion-exchanged water and HY zeolite at room temperature, and dehydrating in an argon environment to produce. A production method. 〔17〕 A method for producing HY zeolite containing iodine pentoxide used in the deodorizing filter according to 〔4〕(claim 4), 1) A step of wet-mixing iodine pentoxide, an aqueous solution dissolved in ion-exchanged water, and HY zeolite at room temperature and drying for a first set time. 2) A step of partially dehydrating the dried powder produced in the drying process by heating it in an argon environment for a second set time that is longer than the first set time, 3) A manufacturing method comprising the step of further heating in an argon environment for a third setting time longer than the second setting time to completely dehydrate the product.

[18] The HY zeolite containing the iodine pentoxide is In step 1) above, the drying process is carried out at a first set temperature. In step 2) above, partial dehydration is performed at a second set temperature that is higher than the first set temperature. The manufacturing method described in

[17] , wherein in step 3) above, complete dehydration is performed at a third set temperature higher than the second set temperature to produce the product.

[19] A method for producing the second adsorbent using the deodorizing filter described in [1], A method for producing NaY zeolite, comprising adding ethylenediamine to NaY zeolite.

[20] The second adsorbent is Ethylenediamine monohydrate is added to ethanol and stirred at room temperature to prepare the deposit solution. The aforementioned sedimentary liquid was wet-mixed with NaY zeolite at room temperature and evaporated. A method for obtaining NaY zeolite containing 50 wt% ethylenediamine, as described in

[19] .

[0015] To achieve the above objectives, an embodiment of the present invention provides a deodorizing filter comprising a first porous body having a plurality of pores, wherein an oxidation catalyst or oxidizing agent is arranged in the pores of the first porous body to oxidize a gas, the first porous body being hydrophobic and comprising a first adsorbent having acid sites, and a second porous body having a plurality of pores, wherein the second porous body comprises a second adsorbent made of zeolite that adsorbs oxidized gas generated as it passes through the first adsorbent, the gas passing through the first adsorbent is oxidized, and the oxidized gas is adsorbed by the second adsorbent.

[0016] The average size of the multiple pores formed in the first porous body is greater than or equal to the average size of the multiple pores formed in the second porous body, so that small molecules oxidized via the first adsorbent can pass through the second porous body.

[0017] The first adsorbent and the second adsorbent are arranged in parallel on different filter substrates, and the gas that has passed through the first adsorbent then passes through the second adsorbent.

[0018] The first adsorbent can use HY zeolite containing iodine pentoxide to promote the oxidation of malodorous gases.

[0019] The first adsorbent can use HY zeolite with an SiO2 / Al2O3 ratio of 500 or more to promote the oxidation of malodorous gases.

[0020] The aforementioned HY zeolite containing iodine pentoxide is produced by mixing an aqueous solution of iodine pentoxide dissolved in ion-exchanged water with HY zeolite at room temperature, and then dehydrating it in an argon environment.

[0021] The HY zeolite containing iodine pentoxide is produced by the following steps: 1) wet mixing iodine pentoxide, an aqueous solution dissolved in deionized water, and HY zeolite at room temperature and drying for a first set time; 2) partially dehydrating the dried powder produced in the drying process by heating it in an argon environment for a second set time longer than the first set time; and 3) then completely dehydrating it by heating it in an argon environment for a third set time longer than the second set time.

[0022] The HY zeolite containing the iodine pentoxide is produced by: step 1) drying at a first set temperature; step 2) partially dehydrating at a second set temperature higher than the first set temperature; and step 3) completely dehydrating at a third set temperature higher than the second set temperature.

[0023] The second adsorbent uses NaY zeolite containing ethylenediamine to adsorb oxidized malodorous gases.

[0024] The second adsorbent is prepared by adding ethylenediamine monohydrate to ethanol, stirring at room temperature to create a deposit solution, and then wet-mixing the deposit solution with NaY zeolite at room temperature and evaporating it to produce a NaY zeolite containing 50 wt% ethylenediamine.

[0025] To achieve the above objectives, an air purifier according to an embodiment of the present invention includes a case having an intake port and an outlet port, a fan disposed inside the case that forms an airflow from the intake port to the outlet port, and a deodorizing filter disposed inside the case that removes malodorous gases from the flowing air, wherein the deodorizing filter includes a first porous body having a plurality of pores, and an oxidation catalyst or oxidizing agent is disposed in the pores of the first porous body to oxidize gas, the first porous body being hydrophobic and having acid sites, and a second porous body having a plurality of pores, the second porous body being a second adsorbent made of zeolite that adsorbs oxidized gas generated as it passes through the first adsorbent, thereby oxidizing malodorous gas flowing in from the intake port through the first adsorbent, and the oxidized gas being adsorbed by the second adsorbent.

[0026] The first adsorbent is positioned closer to the intake port than the second adsorbent, and the second adsorbent is positioned closer to the discharge port than the first adsorbent, so that malodorous gases in the air flowing into the intake port pass through the first adsorbent and the second adsorbent in sequence.

[0027] The case further includes an odor sensor (smell; smell, etc.) positioned inside the case and sensing the concentration of malodorous gases in the flowing air, wherein the odor sensor is positioned between the intake port and the deodorizing filter and can sense the concentration of malodorous gases in the air flowing to the deodorizing filter.

[0028] The system further includes a control device that adjusts the rotation speed of the fan based on the concentration of malodorous gas detected by the odor sensor, thereby allowing the fan speed to be adjusted based on the concentration of malodorous gas detected by the odor sensor.

[0029] The control device can increase the rotation speed of the fan as the concentration of malodorous gas detected by the odor sensor increases, thereby preventing saturation of the second adsorbent and improving the odor removal rate of the first adsorbent.

[0030] The present invention proposes a method for producing HY zeolite containing iodine pentoxide, which is used in a deodorizing filter, comprising mixing an aqueous solution obtained by dissolving iodine pentoxide in ion-exchanged water with HY zeolite at room temperature, and then dehydrating it in an argon environment.

[0031] A method for producing HY zeolite containing iodine pentoxide used in a deodorizing filter according to the present invention, 1) A wet mixing of iodine pentoxide, an aqueous solution dissolved in deionized water, and HY zeolite at room temperature, followed by drying for a first set time, 2) A step of partially dehydrating the dried powder produced in the drying process by heating it in an argon environment for a second set time that is longer than the first set time, 3) A manufacturing method is proposed which further includes the step of heating in an argon environment for a third setting time longer than the second setting time to completely dehydrate the product.

[0032] The HY zeolite containing the aforementioned iodine pentoxide is In step 1) above, the drying process is carried out at a first set temperature. In step 2) above, partial dehydration is performed at a second set temperature that is higher than the first set temperature. The proposed method for producing HY zeolite containing iodine pentoxide according to the present invention is to be produced by completely dehydrating at a third set temperature higher than the second set temperature, in step 3) above.

[0033] A method for producing the second adsorbent used in the deodorizing filter according to the present invention, A manufacturing method is proposed that includes incorporating ethylenediamine into NaY zeolite.

[0034] The second adsorbent is Ethylenediamine monohydrate is added to ethanol and stirred at room temperature to prepare the deposit solution. The aforementioned sedimentary liquid was wet-mixed with NaY zeolite at room temperature and evaporated. A method for producing the second adsorbent used in the deodorizing filter according to the present invention is proposed, which yields NaY zeolite containing 50 wt% ethylenediamine.

[0035] Specific details of other embodiments are included in the detailed description and drawings. [Effects of the Invention]

[0036] The present invention relates to a deodorizing filter and an air purifying device containing the same, and provides one or more of the following effects.

[0037] The deodorizing filter of the present invention has the advantage of simultaneously incorporating two types of gas adsorbents: a porous body supported with a catalyst or oxidizing agent and a porous body impregnated with a chemical adsorbent. After converting the gas to be removed into an acidic gas or the like through the catalyst or oxidizing agent, the generated gas is chemically adsorbed again by the chemical adsorbent, thereby efficiently removing harmful gases.

[0038] The deodorizing filter of the present invention has the advantage that the catalyst and oxidizing agent used in the first adsorbent are active at room temperature without external stimuli, and can therefore be easily applied to various air purification devices without changes to their structure or design.

[0039] The deodorizing filter of the present invention has the advantage of broadening the range of material selection because it is effective against other oxidizing agents in addition to metal catalysts.

[0040] The deodorizing filter of the present invention has the advantage of enabling rapid gas removal without generating intermediate products by performing a short reaction and adsorption in a partial oxidation state beforehand.

[0041] The effects of the present invention are not limited to those mentioned above, and any other effects not mentioned should be clearly understood by those skilled in the art from the claims. [Brief explanation of the drawing]

[0042] [Figure 1] This is a schematic diagram of an air purifier including a deodorizing filter according to one embodiment of the present invention. [Figure 2] This is a sequence diagram showing a method for producing a first adsorbent according to one embodiment of the present invention. [Figure 3] This is a sequence diagram showing a method for producing a second adsorbent according to one embodiment of the present invention. [Figure 4] This is a diagram showing the reaction equation between toluene and iodine pentoxide. [Figure 5] These are photographs showing the color change when the first adsorbent of the present invention reacts with toluene, and the color change when an adsorbent in a comparative example of the first adsorbent reacts with toluene. [Figure 6] This is a schematic diagram of an experimental specimen used to test the performance of the deodorizing filter of the present invention. [Figure 7] Figure 6 shows the performance of the deodorizing filter used in the experiment and the performance of the filter compared to the deodorizing filter in the comparative example. [Modes for carrying out the invention]

[0043] The advantages and features of the present invention, and methods for achieving them, may become clearer by referring to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and can be embodied in a variety of different forms, and these embodiments are provided merely to complete the disclosure of the present invention and to fully inform those who are ordinary skill in the art to which the invention pertains, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0044] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, describing a deodorizing filter and an air purifying device including the same.

[0045] Referring to Figure 1, the air purifier 1 of the present invention includes a case 2 with an intake port 2a formed on one side and an outlet port 2b formed on the other side; a fan 3 disposed inside the case 2 that forms an airflow from the intake port 2a to the outlet port 2b; a deodorizing filter 4 disposed inside the case 2 that removes malodorous gases from the flowing air; an odor sensor 7 disposed inside the case 2 that senses the concentration of malodorous gases; and a control device 8 that adjusts the rotation speed of the fan 3 based on the concentration of malodorous gases sensed by the odor sensor 7.

[0046] The odor sensor 7 is positioned between the air intake 2a and the deodorizing filter 4. The odor sensor 7 can detect the concentration of malodorous gases in the air that flows in through the air intake 2a.

[0047] The odor sensor 7 can measure the concentration of malodorous gases in ppm, and there are no limitations as long as the resolution is around 1 ppm. The odor sensor 7 is preferably an inexpensive and stable semiconductor sensor.

[0048] The control device 8 can control the airflow speed of the fan 3 according to the concentration of malodorous gas measured by the odor sensor 7. In other words, if the concentration of malodorous gas detected by the odor sensor 7 is high, the airflow speed of the fan 3 can be quickly adjusted. Conversely, if the concentration of malodorous gas detected by the odor sensor 7 is low, the airflow speed of the fan 3 can be adjusted to a slower level.

[0049] The deodorizing filter 4 includes a first adsorbent 5a that oxidizes the gas through a catalyst or oxidizing agent, and a second adsorbent 5b that chemically adsorbs the gas that has passed through the first adsorbent 5a and been oxidized.

[0050] Referring to Figure 1, the first adsorbent 5a and the second adsorbent 5b are each mounted on separate filter substrates 6a and 6b. That is, the first adsorbent 5a is mounted on the first filter substrate 6a, and the second adsorbent 5b is mounted on the second filter substrate 6b. The first adsorbent 5a and the second adsorbent 5b are arranged in parallel in the direction of airflow. Therefore, air flowing from the intake port 2a to the discharge port 2b can pass through the first adsorbent 5a and the second adsorbent 5b sequentially. The first adsorbent 5a is positioned adjacent to the intake port 2a, and the second adsorbent 5b is positioned adjacent to the discharge port 2b.

[0051] Therefore, since the gas oxidized by the first adsorbent 5a is adsorbed by the second adsorbent 5b, it is possible to prevent the oxidized gas from leaking to the outside.

[0052] The method of bonding the filter substrate and each adsorbent is not limited as long as the adsorbent is not easily peeled off the filter substrate. Therefore, it is also possible to apply a binder to the filter substrate and then sprinkle the adsorbent onto the filter substrate for bonding.

[0053] The filter substrate of the deodorizing filter is not limited as long as it can adhere to the adsorbent and allows airflow after adhesion. Therefore, nonwoven fabrics or wrinkled paper materials are also acceptable.

[0054] However, unlike in Figure 1, the first adsorbent 5a and the second adsorbent 5b can be bonded to the same filter substrate and used as a single deodorizing filter. When the first adsorbent 5a and the second adsorbent 5b are bonded to the same filter substrate, it is preferable to thoroughly mix the first adsorbent 5a and the second adsorbent 5b beforehand before bonding them to prevent uneven distribution of malodorous gases. There are no particular restrictions on the method of mixing the first adsorbent 5a and the second adsorbent 5b, as long as it does not damage the properties of each adsorbent.

[0055] <First Adsorbent>

[0056] The first adsorbent 5a can be a gas conversion adsorbent that oxidizes the adsorbed gas.

[0057] The catalyst and oxidizing agent used in the first adsorbent 5a are not particularly limited, as long as they are substances that oxidize the adsorbed gas.

[0058] For example, the first adsorbent 5a can be a metal oxide catalyst such as titanium dioxide or manganese dioxide, or an inorganic oxidizing agent such as iodine pentoxide or potassium permanganate. Inorganic oxidizing agents such as iodine pentoxide and potassium permanganate have oxidizing activity even at room temperature. Furthermore, inorganic oxidizing agents such as iodine pentoxide and potassium permanganate do not require external stimulation and are water-soluble, so they can be efficiently supported on porous materials using the low-cost impregnation method.

[0059] The porous material used in the first adsorbent 5a is not particularly limited, as long as it has high adsorption efficiency for the target gas among activated carbon, zeolite porous silica, and MOF.

[0060] For example, when removing non-polar gases such as toluene, the porous material used in the first adsorbent 5a can be a HY zeolite with an SiO2 / Al2O3 ratio of 500 or more.

[0061] HY zeolites with an SiO2 / Al2O3 ratio of 500 or higher are hydrophobic, have pore diameters of 0.6 nm or more for toluene molecules, and possess acid sites that promote the oxidation of toluene involved in the catalyst and oxidizing agent.

[0062] The size of surface pores in a porous material can be greater than or equal to the molecular diameter of malodorous gases, and may be in the range of fine pores less than 50 nm. For example, using toluene molecules (molecular diameter 0.6 nm) as a reference, the size of surface pores in a porous material can be formed in the range of 0.6 to 50 nm. If the (average) diameter of the surface pores (fine pores) is 0.6 nm or less, toluene molecules cannot be adsorbed into the pores, and if it is 50 nm or more, a sufficient specific surface area cannot be maintained, which may reduce the amount of toluene adsorbed.

[0063] Methods for supporting a catalyst or oxidizing agent on a porous material can be selected from known support techniques, such as physically mixing the catalyst or oxidizing agent with a porous support, impregnating or spraying an aqueous solution containing the catalyst or oxidizing agent onto the porous material, or hydrothermal synthesis methods for growing nanoparticles on the porous material. However, impregnation methods are preferred because they are simple and inexpensive.

[0064] The following describes a method for producing the first adsorbent 5a according to the present invention, with reference to Figure 2.

[0065] First, an aqueous solution of 4 wt% iodine pentoxide dissolved in 8 wt% deionized water and 96 wt% HY zeolite (pore size 0.74 nm, particle size 5-7 μm, SiO2 / Al2O3 ratio of 500) are wet-mixed at room temperature for the first set time, and then dried at the second set temperature.

[0066] The dried powder produced in the drying process is heated in an argon environment at a second set temperature for a second set time to partially dehydrate it. Then, it is heated further in an argon environment at a third set temperature for a third set time to completely dehydrate it, thereby obtaining HY zeolite containing 4 wt% iodine pentoxide.

[0067] Here, the first setting time may be set lower than the second setting time, and the second setting time may be set lower than the third setting time. In one embodiment, the first setting time may be set to 1 hour, the second setting time to 2 hours, and the third setting time to 4 hours.

[0068] Here, the first set temperature is lower than the second set temperature, and the second set temperature is lower than the third set temperature. In one embodiment, the first set temperature may be 40°C (313K), the second set temperature may be 120°C (393K), and the third set temperature may be 240°C (513K).

[0069] The first adsorbent 5a of the present invention can be made from HY zeolite containing 4 wt% iodine pentoxide produced by the method described above.

[0070] As shown in Figure 4, iodine pentoxide reacts with toluene to reduce it to iodine. When iodine pentoxide is reduced to iodine, it changes color from white to purple.

[0071] In Figure 5, 500 mg of HY zeolite containing 4 wt% iodine pentoxide, which is the first adsorbent 5a of the present invention, was placed in a separate 3 L Tedlar bag. Additionally, a mixed gas of toluene and dry air, adjusted to a toluene concentration of 20 ppm, was sealed in the Tedlar bag, and the gas was adsorbed onto the adsorbent for 30 minutes. The color change of iodine pentoxide was then observed.

[0072] In Figure 5, the color change of iodine pentoxide due to interaction with a mixed gas of toluene and dry air was observed for the adsorbent according to the first comparative example and the adsorbent according to the second comparative example of the first adsorbent 5a of the present invention, under the same conditions as the first adsorbent 5a.

[0073] Here, the adsorbent used in the first comparative example is an adsorbent produced using HY zeolite with a SiO2 / Al2O3 ratio of 40, instead of HY zeolite with a SiO2 / Al2O3 ratio of 500.

[0074] Furthermore, the adsorbent used in the second comparative example is an adsorbent produced using HY zeolite with a SiO2 / Al2O3 ratio of 5.5, instead of HY zeolite with a SiO2 / Al2O3 ratio of 500.

[0075] In other words, the adsorbent used in the first comparative example and the adsorbent used in the second comparative example used a zeolite with a lower SiO2 / Al2O3 ratio compared to the first adsorbent 5a of the present invention.

[0076] Figure 5 is a photograph showing the color change of the adsorbent before and after adsorption. Referring to Figure 5, it can be seen that the first adsorbent of the present invention, which uses HY zeolite with a high SiO2 / Al2O3 ratio, shows a significant change in hue from white to light purple. In other words, it can be seen that the first adsorbent of the present invention, which uses HY zeolite with a high SiO2 / Al2O3 ratio, promotes the reduction of iodine pentoxide, i.e., the oxidation of toluene.

[0077] <Second Adsorbent>

[0078] The second adsorbent 5b can be an adsorbent for gas materials that chemically adsorbs gases.

[0079] The chemical adsorbent used in the second adsorbent 5b is not limited as long as it can chemically adsorb the target gas. For example, when toluene is oxidized, an acidic gas such as benzoic acid is generated, so the deodorization rate can be increased by using a basic polymer such as ethylenediamine or polyethyleneimine, which has a fast chemical reaction rate, as the second adsorbent 5b.

[0080] The porous material used in the second adsorbent 5b can be a ceramic material whose surface pore size can be easily controlled. Alternatively, the porous material used in the second adsorbent 5b can be a zeolite, which has a high adsorption capacity for low-concentration gases. Since the concentration of the gas generated by oxidation after passing through the first adsorbent 5a is low, a large amount of low-concentration gas can be adsorbed through the zeolite.

[0081] The size of the surface pores of the porous material of the second adsorbent 5b is greater than or equal to the molecular diameter of the malodorous gas, and may be in the range of fine pores of 2 nm or less.

[0082] The average size of the multiple pores formed in the porous body of the second adsorbent 5b is smaller than or equal to the average size of the multiple pores formed in the porous body of the first adsorbent 5a.

[0083] For example, using benzoic acid molecules (molecular diameter 0.4 nm), which are oxidation products of toluene, as a reference, the size of the surface pores of the porous body of the second adsorbent 5b can be formed in the range of 0.4 to 2 nm. If the diameter of the surface pores is 0.4 nm or less, benzoic acid molecules cannot be adsorbed into the pores, and if it is 2 nm or more, other gas molecules and moisture from the air are adsorbed in large quantities and fill the pores, thus inhibiting the adsorption of benzoic acid.

[0084] Such porous materials of the second adsorbent 5b can be selected by directly observing the surface with an electron microscope such as a TEM, or by calculating the mean pore size using a gas adsorption method. Alternatively, the surface of the porous material of the second adsorbent 5b may be coated with a porous material or nanofiber with smaller pore sizes, such as an MOF, or the surface pore size may be controlled by surface modification with silanol groups.

[0085] There are no restrictions on the adsorption method of the chemical adsorbent, but impregnation is preferred because it is simple and can be implemented at low cost.

[0086] The following describes a method for producing the second adsorbent 5b according to the present invention, with reference to Figure 3.

[0087] First, 100 wt% ethylenediamine monohydrate is added to 100 wt% ethanol and stirred at room temperature for 40 minutes to prepare a deposit solution. The deposit solution is then wet-mixed with 100 wt% NaY zeolite (pore size 0.74 nm, particle size 5-7 μm, SiO2 / Al2O3 ratio of 5.5) at room temperature for 10 hours, and then evaporated at 70°C (343 K) for 24 hours to obtain NaY zeolite supported with 50 wt% ethylenediamine.

[0088] The second adsorbent 5b of the present invention can be NaY zeolite on which 50 wt% of ethylenediamine produced by the above method is supported.

[0089] The deodorizing filter 4 of the present invention, equipped with a first adsorbent 5a and a second adsorbent 5b, effectively removes malodorous gases by converting gases in the flowing air into acidic gases that strongly interact with the oxidative adsorbent as they pass through the first adsorbent 5a, and then further chemically adsorbing the gases generated as they pass through the second adsorbent 5b.

[0090] The performance of the deodorizing filter 4 of the present invention can be determined through the following experiment.

[0091] Figure 6 shows the performance of the deodorizing filter 4 through a separate experimental setup. This experimental setup includes a housing 11 with a jig formed inside in which the deodorizing filter 4 is placed, the deodorizing filter 4 placed inside the housing 11 to remove malodorous gases from the air passing through the jig, and a ventilation fan 12 that forms airflow inside the housing 11.

[0092] The housing 11 can be made of acrylic material. The housing 11 can have a space that forms an airflow inside. The inside of the housing 11 can be formed to a size of approximately 27L. The jig formed inside the housing 11 can have the shape of a square with sides of 50mm.

[0093] The operation of the ventilation fan 12 allows the air inside the housing 11 to flow. The operation of the ventilation fan 12 allows the air that has passed through the jig to pass through the deodorizing filter 4.

[0094] Therefore, by placing 10 ppm toluene inside the experimental specimen and adjusting the voltage of the ventilation fan 12 so that the airflow velocity of the gas passing through the deodorizing filter 4 is 0.2 m / s, the performance of the deodorizing filter 4 can be determined. After exposing the toluene to the deodorizing filter 4 for 60 minutes under the above conditions, the inside of the housing 11 was measured using a sensing device (not shown).

[0095] Here, the sensing device can use a photoionization detector that senses the gas concentration inside the housing 11 and an acetic acid detection tube that senses the acidic gas concentration.

[0096] Referring to Figure 7, it can be seen that when using the deodorizing filter 4 of the present invention, toluene is reduced by 70% or more. Furthermore, it can be seen that when using the deodorizing filter 4 of the present invention, acidic gases are below the detection limit.

[0097] On the other hand, unlike the deodorizing filter 4 of the present invention, the deodorizing filter of the first comparative example, which uses only the first adsorbent, shows that 7% of the acidic gas remains. Furthermore, the deodorizing filter of the second comparative example, which contains the first adsorbent using HY zeollide that does not support iodine pentoxide but does not contain the second adsorbent, shows a significantly reduced toluene removal rate. In other words, the deodorizing filter 4 of the present invention achieves a toluene removal rate of 11% or more compared to the deodorizing filter of the second comparative example.

[0098] <Operation>

[0099] The air purifier 1 measures the concentration of malodorous gases in the external environment using an odor sensor 7, and operates the fan 3 to ensure airflow through the deodorizing filter 4.

[0100] When fan 3 is activated, the air flowing into the intake port 2a of case 2 passes through the deodorizing filter 4. Therefore, malodorous gases flowing into the intake port 2a may pass through the deodorizing filter 4 and have their concentration reduced.

[0101] The air passing through the deodorizing filter 4 may have a lower concentration of malodorous gases after passing through the first adsorbent 5a and the second adsorbent 5b.

[0102] At this time, the size of the surface pores of the porous material constituting the second adsorbent 5b of the deodorizing filter 4 is as narrow as the molecular diameter of the malodorous gas, increasing the diffusion resistance into the pores and limiting the amount of adsorption at high air velocity.

[0103] In other words, when the concentration of malodorous gas is high, controlling the fan's airflow speed to a high speed can limit gas adsorption to the second adsorbent 5b, preventing immediate saturation of adsorption. Furthermore, since the circulation recovery per unit time increases, the odor removal rate of the first adsorbent can be improved.

[0104] <Manufacturing method>

[0105] The present invention proposes a method for producing HY zeolite containing iodine pentoxide, which is used in a deodorizing filter, comprising mixing an aqueous solution obtained by dissolving iodine pentoxide in ion-exchanged water with HY zeolite at room temperature, and then dehydrating it in an argon environment.

[0106] A method for producing HY zeolite containing iodine pentoxide used in a deodorizing filter according to the present invention, 1) A wet mixing of iodine pentoxide, an aqueous solution dissolved in deionized water, and HY zeolite at room temperature, followed by drying for a first set time, 2) A step of partially dehydrating the dried powder produced in the drying process by heating it in an argon environment for a second set time that is longer than the first set time, 3) A manufacturing method is proposed which further includes the step of heating in an argon environment for a third setting time longer than the second setting time to completely dehydrate the product.

[0107] The HY zeolite containing the aforementioned iodine pentoxide is In step 1) above, the drying process is carried out at a first set temperature. In step 2) above, partial dehydration is performed at a second set temperature that is higher than the first set temperature. The proposed method for producing HY zeolite containing iodine pentoxide according to the present invention is to be produced by completely dehydrating at a third set temperature higher than the second set temperature, in step 3) above.

[0108] A method for producing the second adsorbent used in the deodorizing filter according to the present invention, A manufacturing method is proposed that includes incorporating ethylenediamine into NaY zeolite.

[0109] The second adsorbent is Ethylenediamine monohydrate is added to ethanol and stirred at room temperature to prepare the deposit solution. The aforementioned sedimentary liquid was wet-mixed with NaY zeolite at room temperature and evaporated. A method for producing the second adsorbent used in the deodorizing filter according to the present invention is proposed, which yields NaY zeolite containing 50 wt% ethylenediamine.

[0110] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and it is of course possible for a person with ordinary skill in the art to which the invention belongs to make various modifications without departing from the gist of the present invention as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospects of the present invention. [Explanation of Symbols]

[0111] 1. Air purifier 2 cases 3 Fans 4. Deodorizing filter 5a First adsorbent 5b Second adsorbent 7. Odor sensor 8 Control device

Claims

1. It is a deodorizing filter, A first porous body having multiple pores is provided, an oxidation catalyst or oxidizing agent is placed in the pores of the first porous body to oxidize a gas, the first porous body is hydrophobic, and a first adsorbent having acid sites is provided. The device comprises a second porous body having multiple pores, and a second adsorbent composed of zeolite that adsorbs oxidizing gases generated as the second porous body passes through the first adsorbent. The first adsorbent is a deodorizing filter using HY zeolite containing iodine pentoxide.

2. The deodorizing filter according to claim 1, wherein the average size of the plurality of pores formed in the first porous body is greater than or equal to the average size of the plurality of pores formed in the second porous body.

3. The deodorizing filter according to claim 1, wherein the first adsorbent and the second adsorbent are arranged in parallel on different filter substrates.

4. The first adsorbent is SiO ２ / Al ２ O ３ The deodorizing filter according to claim 1, which uses HY zeolite having a ratio of 500 or more.

5. A method for manufacturing a deodorizing filter according to Claim 1, Mix an aqueous solution of iodine pentoxide dissolved in deionized water with HY zeolite at room temperature; Dehydration in an argon environment; and A method for producing a deodorizing filter according to claim 1, comprising producing an HY zeolite containing iodine pentoxide as the first adsorbent.

6. A method for manufacturing a deodorizing filter according to Claim 1, 1) A wet mixing of iodine pentoxide, an aqueous solution dissolved in deionized water, and HY zeolite at room temperature, followed by drying for a first set time; 2) A step of partially dehydrating the dried powder produced in the drying process by heating it in an argon environment for a second set time that is longer than the first set time; 3) Thereafter, the step of heating in an argon environment for a third setting time longer than the second setting time to completely dehydrate; and 4) A method for producing a deodorizing filter according to claim 1, comprising the step of producing an HY zeolite containing iodine pentoxide as the first adsorbent.

7. In step 1), the drying process is carried out at a first set temperature. In step 2) above, partial dehydration is performed at a second set temperature that is higher than the first set temperature. The method for manufacturing a deodorizing filter according to claim 6, wherein in step 3), complete dewatering is performed at a third set temperature higher than the second set temperature.

8. The deodorizing filter according to claim 1, wherein the second adsorbent is NaY zeolite containing ethylenediamine.

9. A method for manufacturing a deodorizing filter according to Claim 8, Ethylenediamine monohydrate is added to ethanol and stirred at room temperature to prepare a deposit solution; The aforementioned sedimentary liquid was wet-mixed with NaY zeolite at room temperature and evaporated; A method for producing a deodorizing filter according to claim 8, comprising producing a NaY zeolite containing 50 wt% ethylenediamine as the second adsorbent.

10. It is an air purifier, Cases in which an intake port and an outlet port are formed; A fan is disposed inside the case and forms an airflow from the intake port to the discharge port; The case is equipped with a deodorizing filter, which is placed inside the case and removes malodorous gases from the flowing air; The aforementioned deodorizing filter is A first porous body having multiple pores formed therein is provided, and an oxidation catalyst or oxidizing agent is placed in the pores of the first porous body to oxidize a gas. The first porous body is A first adsorbent using HY zeolite which is hydrophobic, has acid sites, and contains iodine pentoxide, A second porous body having multiple pores formed therein, The air purifier comprises a second porous body which is composed of a zeolite that adsorbs oxidizing gases generated as it passes through the first adsorbent.

11. The first adsorbent is positioned more adjacent to the intake port than the second adsorbent, The air purifier according to claim 10, wherein the second adsorbent is positioned more adjacent to the discharge port than the first adsorbent.

12. The case is further equipped with an odor sensor located inside the case, which senses the concentration of malodorous gases in the flowing air. The air purifier according to claim 10, wherein the odor sensor is disposed between the intake port and the deodorizing filter.

13. The air purifier according to claim 12, further comprising a control device that adjusts the rotation speed of the fan based on the concentration of malodorous gases detected by the odor sensor.

14. The air purifying device according to claim 13, wherein the control device increases the rotation speed of the fan as the concentration of the malodorous gas detected by the odor sensor increases.

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