JP4407348B2 - Exhaust gas purification filter manufacturing method and catalyst-carrying exhaust gas purification filter - Google Patents

Description

  The present invention relates to a pressure heating drying method, a pressure heating drying apparatus, a method for manufacturing an exhaust gas treatment filter, and a catalyst-supported exhaust gas purification filter manufactured through pressure heating drying.

  In recent years, regulations and nitrogen oxides contained in exhaust gas discharged from an internal combustion engine have been gradually tightened for environmental protection and health reasons.

  Conventionally, in order to collect and purify particulates and nitrogen oxides released into the atmosphere, a method of attaching a ceramic or metal honeycomb filter in the middle of the exhaust path has been generally proposed. More recently, as shown in Patent Document 1, an attempt has been made to support a catalyst for exhaust gas purification on a ceramic honeycomb structure and burn particulates with the heat of exhaust gas.

  A honeycomb structure for purifying a catalyst-supporting exhaust gas is obtained by attaching a catalyst solution to a honeycomb structure and drying it, followed by firing if necessary. When drying the honeycomb structure to which the catalyst solution adheres, if it is dried naturally or put into a dryer and heated at normal pressure, drying starts from the outer periphery of the honeycomb structure and gradually toward the center. Drying progresses. Then, as the honeycomb structure is dried, the catalyst component in the catalyst solution is moved, and the catalyst carrying amount in each part of the honeycomb structure is distributed.

  Therefore, in order to prevent the catalyst component from moving, there is a method called freeze drying, in which the honeycomb structure to which the catalyst solution is adhered is instantly frozen with liquid nitrogen or the like and then the solvent is sublimated and dried by reducing the pressure in a vacuum dryer. It was used. In addition, as shown in Patent Document 2, a method of pressurizing and heating a honeycomb structure to which a catalyst solution is attached is also used.

  FIG. 9 shows a schematic diagram of a conventional pressure heating drying apparatus. As shown in FIG. 9, the pressure drying apparatus 101 includes a pressure gas cylinder or compressor 102, a heating heater 103, a cooling device 104 on the side of the device, and a fan 105 inside the device. In the pressure drying apparatus 101, an exhaust gas purification filter 106 to which a catalyst solution is attached is placed in advance.

In the above configuration, the hot air heated by the heating heater 103 and sent by the fan 105 passes through the inside or outside of the exhaust gas purification filter 106 to which the catalyst solution is adhered, and circulates in the apparatus. The hot air that has passed through the inside or outside of the exhaust gas purification filter 106 to which the catalyst solution has adhered and the humidity has increased becomes vaporized when passing through the vicinity of the cooling device 104, and becomes dry hot air again.
JP 2003-190793 A JP 2003-222467 A

  However, the freeze-drying uses sublimation of the solvent attached to the material to be dried, so that drying occurs only slowly, and it takes about 40 hours to completely dry. Furthermore, in addition to the need for a large-scale device, liquid nitrogen for freezing is also required, so that there are problems in terms of cost.

  Moreover, when the pressure loss of the material to be dried is high, the pressure heating drying has a problem that the internal temperature is difficult to increase because the circulating air cannot pass through the material to be dried. Furthermore, since the inside of the container has not reached the saturated vapor pressure, when the temperature in the container is increased, evaporation starts from the outer peripheral portion of the object to be dried, and the amount of catalyst supported after drying is distributed. There was also.

  Therefore, the present invention can evaporate the solvent after raising the temperature uniformly even to the inside even if the object to be dried has a high pressure loss, and thereby the object to be dried can be uniformly dried, and Provided are a pressure heating drying method and apparatus capable of drying at low cost in a short time, a method for producing an exhaust gas purification filter, and an exhaust gas purification filter uniformly produced by the production method. The purpose is to do.

In the pressure heating drying method, the same solvent as the solvent adhering to the object to be dried is put into the container, the inside of the container is saturated once with the vapor of the solvent, and the solvent adhering to the object to be dried is evaporated. After depressing, the vapor of the solvent is condensed to lower the absolute humidity of the solvent in the container, thereby evaporating the solvent adhering to the object to be dried and drying the object to be dried. is there. By saturating the inside of the container with the same solvent as the solvent adhering to the object to be dried, evaporation of the solvent adhering to the object to be dried can be suppressed.

Further , in the pressure heating drying method, after the pressure in the container is set higher than the atmospheric pressure, the temperature is increased to a temperature equal to or higher than the boiling point of the solvent at the atmospheric pressure and lower than the boiling point of the solvent at the atmospheric pressure. After saturating in the container, the inside of the container is cooled, the vapor is condensed, and the humidity of the solvent in the container is lowered, thereby evaporating the solvent adhering to the object to be dried and drying the object to be dried. It is what. By making the pressure higher than the atmospheric pressure, the boiling point of the solvent adhering to the material to be dried increases, and evaporation of the solvent can be suppressed. As described above, by introducing the same solvent as the solvent adhering to the object to be dried, evaporation of the solvent adhering to the object to be dried can be further suppressed.

Further, the pressing and heating drying method is characterized in that material to be dried is a filter for exhaust gas purification. As a result, an exhaust gas purification filter in which the catalyst is uniformly supported can be obtained, and exhaust gas containing harmful substances can be effectively collected and removed.

Further, the pressing and heating drying method is characterized in that an exhaust gas purifying filter Gase ceramic porous body. Thus, it is possible to perform the drying of the ceramic porous filter effectively.

  The exhaust gas purifying filter manufacturing method of the present invention includes the step of drying by the above method. Thereby, the time concerning drying in a manufacturing process can be shortened significantly.

In the exhaust gas purification filter manufacturing method of the present invention, the same solvent as the solvent adhering to the object to be dried is put into the container, and the container is once saturated with the vapor of the solvent, and then adhered to the object to be dried. A catalyst obtained by evaporating a solvent to be dried and drying the material to be dried, wherein the material to be dried is an exhaust gas purification filter, the exhaust gas purification filter is a ceramic porous body, and a catalyst is dissolved or dispersed in a solvent Before drying the exhaust gas purification filter to which the liquid is adhered, the exhaust gas purification filter manufacturing method is characterized in that the inside of the micropores of the exhaust gas purification filter is degassed. Further, in the exhaust gas purification filter manufacturing method of the present invention, the exhaust gas purification filter is a ceramic porous body, and before drying the exhaust gas purification filter to which a catalyst solution obtained by dissolving or dispersing the catalyst in a solvent is attached, The inside of the fine holes of the exhaust gas purification filter was degassed, and after the deaeration, the same solvent as the solvent adhering to the exhaust gas purification filter was put into the container, and the inside of the container was saturated with the vapor of the solvent. Thereafter, the exhaust gas purifying filter manufacturing method is characterized in that the solvent adhering to the exhaust gas purifying filter is evaporated to dry the exhaust gas purifying filter. In addition, the exhaust gas purification filter manufacturing method of the present invention is heated by a heater for heating, and the hot air sent by the fan is passed through the inside of the exhaust gas purification filter to which the catalyst liquid is adhered, thereby drying the exhaust gas purification filter. The exhaust gas purifying filter manufacturing method according to claim 1 or 2, wherein: In addition, the exhaust gas purification filter manufacturing method of the present invention is heated by a heater for heating, and the hot air sent by a fan is allowed to pass through the inside of the exhaust gas purification filter to which the catalyst liquid adheres, and then passes through the vicinity of the cooling device. 3. The exhaust gas purifying filter manufacturing method according to claim 1, wherein the exhaust gas purifying filter is dried by condensing steam and heating and circulating again with the heating heater. As a result, the catalyst solution covering and closing the fine holes can be removed, and when passing through the air, the gas passing through the exhaust gas purification filter can be easily passed, and the drying time can be shortened. . Furthermore, the movement of the catalyst component can be prevented by shortening the drying time, and the catalyst can be supported uniformly. Moreover, after suppressing evaporation of the solvent adhering to the object to be dried, the entire object to be dried can be simultaneously dried.

  The catalyst-carrying exhaust gas purifying filter of the present invention is obtained by treating the exhaust gas purifying filter to which the catalyst liquid is adhered by the above-described production method. Thereby, a catalyst-carrying exhaust gas purification filter in which the catalyst is uniformly carried can be obtained.

  The catalyst-carrying exhaust gas purification filter of the present invention is characterized in that the catalyst is uniformly supported. The catalyst-carrying exhaust gas purification filter produced by the above production method can purify the exhaust gas efficiently because the catalyst is uniformly supported.

From elaborate suppress evaporation of the solvent adhering to the material to be dried, Ru can be dried whole material to be dried simultaneously.

Moreover, since a uniform temperature of the whole object to be dried, Ru can be uniformly dry the whole material to be dried.

ADVANTAGE OF THE INVENTION According to this invention, the drying time can be shortened and the exhaust-gas-purification filter manufacturing method which can prevent a movement of a catalyst component, and the exhaust-gas-purification filter by which the catalyst was carry | supported uniformly can be provided. Moreover, after suppressing evaporation of the solvent adhering to the object to be dried, the entire object to be dried can be simultaneously dried.

Further, according to the present invention, ceramic porous body catalyst by supporting the can provide a filter for the catalyst-carrying exhaust gas purification.

In the pressure heating drying method, the same solvent as the solvent adhering to the object to be dried is put into the container, the inside of the container is saturated once with the vapor of the solvent, and the solvent adhering to the object to be dried is evaporated. After depressing, the vapor of the solvent is condensed to lower the absolute humidity of the solvent in the container, thereby evaporating the solvent adhering to the object to be dried and drying the object to be dried. is there.

  As a method for introducing the solvent into the container, the solvent may be previously placed in the container, or a facility for introducing the solvent may be provided and added in small amounts as needed. However, when the vapor is saturated, the solvent must be added excessively so that the solvent is present in the container as a liquid.

  In addition, as a method for condensing the solvent, the container may be cooled, or the apparatus may be condensed by providing a coolable device in the container. When cooling the container, if the upper part of the container is cooled, the condensed solvent may fall on the object to be dried, and if the lower part of the container is cooled, the condensed solvent may accumulate and the cooling capacity may be reduced. Is preferably cooled.

Further , in the pressure heating drying method, after the pressure in the container is set higher than the atmospheric pressure, the temperature is increased to a temperature equal to or higher than the boiling point of the solvent at the atmospheric pressure and lower than the boiling point of the solvent at the atmospheric pressure. After saturating in the container, the inside of the container is cooled, the vapor is condensed, and the humidity of the solvent in the container is lowered, thereby evaporating the solvent adhering to the object to be dried and drying the object to be dried. It is what.

  As a method of pressurization, a gas may be introduced from a high-pressure gas cylinder, or a gas compressed from a gas supplied from an air line often used in a factory or the like using a compressor may be introduced. The gas to be introduced may be air, but an inert gas may be introduced when a compound or the like that is oxidized by oxygen in the air at high temperatures is included.

  The temperature at this time is preferably 10 ° C. to 50 ° C. below the boiling point of the solvent at atmospheric pressure and below the boiling point of the solvent at the internal pressure. More preferably, it is 10 ° C. to 20 ° C. below the boiling point of the solvent at atmospheric pressure and below the boiling point of the solvent at the pressure in the vessel. If the temperature is raised to near the boiling point of the solvent at the pressure in the container, evaporation will start just by reducing the pressure a little, and if the pressure is suddenly reduced, the drying will proceed at once, the part where drying started first, and the drying last. The time difference from the finished part can be made as small as possible.

  Examples of the cooling method include, but are not limited to, a water cooling method, an air cooling method, and a refrigerant method.

Further, the pressing and heating drying method is characterized in that material to be dried is a filter for exhaust gas purification.

  Exhaust gas purification filters can purify various exhaust gases such as engines of transport engines such as automobiles, cultivators, ships and trains, fixed engines such as generators, and firing furnaces, incinerators, boilers, etc. it can. Examples of the engine include, but are not limited to, a gasoline engine and a diesel engine.

  Examples of the shape of the exhaust gas purifying filter include, but are not limited to, a cylindrical shape, a prismatic shape, a rectangular parallelepiped shape, and a cubic shape.

Further, the pressing and heating drying method is characterized in that an exhaust gas purifying filter Gase ceramic porous body.

Se The ceramic porous body, mullite, cordierite, aluminum titanate, silica, alumina, silica-alumina, silicon carbide, may be used silicon nitride or the like, but is not limited thereto.

  The exhaust gas purifying filter manufacturing method of the present invention includes the step of drying by the above method.

  The catalyst solution is adhered to the exhaust gas purification filter by a method such as impregnating the exhaust gas purification filter into the catalyst solution or spraying the catalyst solution onto the exhaust gas purification filter, and then dried by the drying method of the present invention. If there is, it is fired at an appropriate temperature according to the catalyst. Although an example of the manufacturing method is shown here, the manufacturing method is not limited to this. The catalyst solution shown here is a solution obtained by dissolving or dispersing a catalyst in a solvent. Two or more components may be mixed in the catalyst. The solvent may be a polar solvent such as water or alcohol, or a nonpolar solvent. Further, there may be a dispersant or a surfactant for dispersing the catalyst in the catalyst solution.

In the exhaust gas purification filter manufacturing method of the present invention, the same solvent as the solvent adhering to the object to be dried is put into the container, and the container is once saturated with the vapor of the solvent, and then adhered to the object to be dried. A catalyst obtained by evaporating a solvent to be dried and drying the material to be dried, wherein the material to be dried is an exhaust gas purification filter, the exhaust gas purification filter is a ceramic porous body, and a catalyst is dissolved or dispersed in a solvent Before drying the exhaust gas purification filter to which the liquid is adhered, the exhaust gas purification filter manufacturing method is characterized in that the inside of the micropores of the exhaust gas purification filter is degassed. Further, in the exhaust gas purification filter manufacturing method of the present invention, the exhaust gas purification filter is a ceramic porous body, and before drying the exhaust gas purification filter to which a catalyst solution obtained by dissolving or dispersing the catalyst in a solvent is attached, The inside of the fine holes of the exhaust gas purification filter was degassed, and after the deaeration, the same solvent as the solvent adhering to the exhaust gas purification filter was put into the container, and the inside of the container was saturated with the vapor of the solvent. Thereafter, the exhaust gas purifying filter manufacturing method is characterized in that the solvent adhering to the exhaust gas purifying filter is evaporated to dry the exhaust gas purifying filter. In addition, the exhaust gas purification filter manufacturing method of the present invention is heated by a heater for heating, and the hot air sent by the fan is passed through the inside of the exhaust gas purification filter to which the catalyst liquid is adhered, thereby drying the exhaust gas purification filter. The exhaust gas purifying filter manufacturing method according to claim 1 or 2, wherein: In addition, the exhaust gas purification filter manufacturing method of the present invention is heated by a heater for heating, and the hot air sent by a fan is allowed to pass through the inside of the exhaust gas purification filter to which the catalyst liquid adheres, and then passes through the vicinity of the cooling device. 3. The exhaust gas purifying filter manufacturing method according to claim 1, wherein the exhaust gas purifying filter is dried by condensing steam and heating and circulating again with the heating heater.

  By degassing the fine pores of the exhaust gas purification filter to which the catalyst liquid has adhered, the catalyst liquid covering and closing the fine pores can be removed, and the gas that passes through the exhaust gas purification filter during ventilation drying (Usually air) can easily pass through and the drying time can be shortened. Furthermore, by shortening the drying time, movement of the catalyst component can be prevented and the catalyst can be supported uniformly. In addition, the catalyst solution can be spread to the inside of the micropores to increase the catalyst solution adhesion surface area. Moreover, it can suppress that the pressure loss of the three-dimensional structure after drying raises.

  As a degassing method, a method of pressurizing or depressurizing in a container capable of pressurization and depressurization can be considered, but it is not limited to these methods. As a method of depressurization, there is a method of depressurizing by putting a three-dimensional structure adhering to a catalyst solution into a depressurizable container and sucking air in the container with a vacuum pump. is not.

  The catalyst-carrying exhaust gas purifying filter of the present invention is obtained by treating the exhaust gas purifying filter to which the catalyst liquid is adhered by the above-described production method.

  By treating with the above manufacturing method, the increase in pressure loss is suppressed because the fine pores are not covered with the catalyst, and a plurality of catalyst components are uniformly supported, and the catalyst support having a large catalyst support area is supported. An exhaust gas purifying filter can be obtained. When this is installed in the exhaust path of the internal combustion engine, an increase in pressure loss is suppressed, so the load on the engine is reduced, and the exhaust gas can be efficiently purified because the catalyst carrying area is large.

  Further, the catalyst-carrying exhaust gas purification filter becomes an exhaust gas purification filter having various functions by changing the type of catalyst. For example, a combustion catalyst for burning particulates contained in diesel exhaust gas, an oxidation catalyst for oxidizing NO and CO and raising the exhaust gas temperature by oxidation heat, an occlusion catalyst for storing NOx and SOx, etc. There is. When combined with a heater for raising the exhaust gas temperature or an oxidation catalyst-supported exhaust gas purification filter at the front stage of the particulate combustion catalyst-supported exhaust gas purification filter, and a storage catalyst-supported exhaust gas purification filter at the subsequent stage, the exhaust gas is further increased. Can be purified.

  The catalyst-carrying exhaust gas purification filter of the present invention is characterized in that the catalyst is uniformly supported.

  Here, the uniform loading means that the catalyst loading is the same regardless of the position of the catalyst-carrying exhaust gas purification filter. In addition, when a plurality of catalyst components are included, it is indicated that the ratio of the catalyst components is the same regardless of the position.

  Hereinafter, the present invention will be described in detail with reference to embodiments and examples, but the present invention should not be construed as being limited to the following description.

(Embodiment 1)
As shown in FIG. 1, the drying device 1 includes a cooling device 104. In the drying apparatus 1, an object to be dried 2 with a solvent attached and a solvent 3 identical to the solvent adhering to the object to be dried 2 are placed.

  In the above configuration, after the inside of the drying apparatus 1 is saturated with the vapor of the same solvent 3 as the solvent adhering to the object to be dried 2, the cooling apparatus 104 is operated to condense the vapor of the solvent in the drying apparatus 1. Thus, the absolute humidity in the drying apparatus 1 can be lowered, the solvent 3 attached to the object to be dried 2 can be evaporated, and the object to be dried 2 can be dried.

(Embodiment 2)
As shown in FIGS. 2 and 3, the pressure drying apparatus 101 includes a pressure gas cylinder or compressor 102, a heating heater 103, a cooling device 104 on the side of the device, and a fan 105 and an air collecting unit 4 inside the device. ing. An exhaust gas purifying filter 106 to which the catalyst solution is attached is attached to the air collecting unit 4, and the same solvent 5 as the solvent adhering to the exhaust gas purifying filter 106 is placed in the apparatus in advance.

  In the above configuration, the hot air heated by the heating heater 103 and sent by the fan 105 passes through the inside of the exhaust gas purification filter 106 to which the catalyst solution is adhered, and circulates in the apparatus. The hot air that has passed through the inside of the exhaust gas purification filter 106 to which the catalyst solution has adhered and the humidity has increased becomes vaporized when passing through the vicinity of the cooling device 104, and becomes dry hot air again. The air collecting unit 4 allows all the dry hot air circulating to pass through the exhaust gas purification filter 106 to which the catalyst liquid adheres, so that the temperature of the exhaust gas purification filter 106 to which the catalyst liquid adheres is raised efficiently. , And can be dried uniformly in a short time.

(Embodiment 3)
As shown in FIG. 4, the pressurizing and drying apparatus 101 includes a pressurizing gas cylinder or compressor 102, a heating heater 103, a cooling device 104 on the side of the apparatus, a fan 105 and a bifurcated air collecting unit 6 inside the apparatus. . An exhaust gas purifying filter 106 to which the catalyst solution is attached is attached to the bifurcated air collecting section 6, and the same solvent 5 as the solvent adhering to the exhaust gas purifying filter 106 is placed in the apparatus in advance.

  In the above configuration, the hot air heated by the heating heater 103 and sent by the fan 105 passes through the inside of the exhaust gas purification filter 106 to which the catalyst solution is adhered, and circulates in the apparatus. The hot air that has passed through the inside of the exhaust gas purification filter 106 to which the catalyst solution has adhered and the humidity has increased becomes vaporized when passing through the vicinity of the cooling device 104, and becomes dry hot air again. By the bifurcated air collecting unit 6, all the circulating hot air circulating circulates uniformly through the two exhaust gas purification filters 106 to which the catalyst solution is adhered, so that the two are uniformly dried without temperature distribution. can do.

(Embodiment 4)
As shown in FIG. 5, the exhaust gas purification device 7 includes an exhaust pipe or frame 8, a catalyst-supported exhaust gas purification filter 9, and an exhaust gas heater 10.

  In the above configuration, the exhaust gas is heated by the exhaust gas heater 10 above the catalyst activation temperature of the catalyst-carrying exhaust gas purification filter 9 and sent to the catalyst-carrying exhaust gas purification filter 9. The exhaust gas is collected and purified by the catalyst-carrying exhaust gas purification filter 9, and harmful substances discharged from behind are reduced.

  The catalyst-carrying exhaust gas purification filter 9 suppresses an increase in pressure loss, reduces the load on the engine, and has a large catalyst-carrying area, and can efficiently purify the exhaust gas.

Example 1
An aqueous solution in which a plurality of catalyst components such as copper sulfate pentahydrate is dissolved is impregnated with a columnar exhaust gas purification filter having a diameter of 5.66 inches and a length of 6 inches, and then left to stand for about 1 hour for surplus. The liquid was removed.

  As shown in FIG. 6, the exhaust gas purification filter 106 to which the catalyst solution was attached was placed in a container 11 that can be depressurized, the vacuum pump 12 was turned on, the leak valve 13 was gradually closed, and a pretreatment for drying was performed. Thereafter, the exhaust gas purification filter 106 to which the catalyst solution was adhered was dried under pressure.

  As shown in FIG. 7, the pressure drying apparatus 101 includes a pressure nitrogen cylinder 14, a heating heater 103, a cooling device 104 on the side of the device, and a fan 105 and an air collecting unit 4 inside the device. An exhaust gas purifying filter 106 to which a catalyst solution is attached is attached to the air collecting unit 4, and water 15 is previously placed in the apparatus.

  In the above configuration, the hot air heated by the heating heater 103 and sent by the fan 105 passes through the inside of the exhaust gas purification filter 106 to which the catalyst solution is adhered, and circulates in the apparatus. The hot air that has passed through the inside of the exhaust gas purification filter 106 to which the catalyst solution has adhered and the humidity has increased becomes vaporized when passing through the vicinity of the cooling device 104, and becomes dry hot air again. The air collecting unit 4 allows all the dry hot air circulating to pass through the exhaust gas purification filter 106 to which the catalyst liquid adheres, so that the temperature of the exhaust gas purification filter 106 to which the catalyst liquid adheres is raised efficiently. , And can be dried uniformly in a short time.

  As shown in FIG. 8, the drying temperature program was raised to 25 ° C. in 10 minutes, raised to 150 ° C. in 25 minutes, held at 150 ° C. for 20 minutes, and lowered to 25 ° C. in 30 minutes. The drying pressure program was raised to 1.75 MPa in 10 minutes, held at 1.75 MPa for 35 minutes, and lowered to 0 MPa in 30 minutes. Nitrogen having a purity of 99.99% was used as the pressurizing gas, and cooling water for condensing water vapor began to flow 45 minutes after the start of drying.

  When it was dried by freeze-drying, it took about 40 hours, whereas when it was carried out by the pressure heating drying method of the present invention, the drying process was completed in about 1.5 hours.

  The pressure heating drying method of the present invention can evaporate the solvent even when the object to be dried has a high pressure loss, and can evaporate the solvent uniformly, and can be dried at a low cost in a short time. Can and is useful.

  In addition, the catalyst-carrying exhaust gas purifying filter of the present invention is manufactured by the manufacturing method that has undergone the drying method, and since the increase in pressure loss is suppressed, the load on the engine is reduced and the catalyst-carrying area is large. The exhaust gas can be purified efficiently and is useful.

Schematic diagram of drying apparatus in Embodiment 1 of the present invention Schematic diagram of pressure heating drying apparatus in Embodiment 2 of the present invention Schematic diagram of pressure heating drying apparatus in Embodiment 2 of the present invention Schematic diagram of pressure heating drying apparatus in Embodiment 3 of the present invention Schematic diagram of exhaust gas purification device in Embodiment 4 of the present invention Schematic diagram of pre-drying processing apparatus in Example 1 of the present invention Schematic diagram of pressure heating drying apparatus in Example 1 of the present invention Pressurization heating drying program diagram in Example 1 of the present invention Schematic diagram of conventional pressure heating drying equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drying apparatus 2 To-be-dried object 3 The same solvent as the solvent adhering to the to-be-dried object 2 4 Air collecting part 5 The same solvent as the solvent adhering to the exhaust gas purification filter 106 6 Forked air collecting part 7 Exhaust gas purifying apparatus 8 Exhaust pipe or frame 9 Catalyst-supported exhaust gas purification filter 10 Exhaust gas heater 11 Depressurizable container 12 Vacuum pump 13 Leak valve 14 Pressurization nitrogen cylinder 15 Water 101 Pressurization dryer 102 Pressurization gas cylinder or compressor 103 Heating heater 104 Cooling device 105 Fan 106 Filter for exhaust gas purification with catalyst solution attached

Claims (6)

Fill the container with the same solvent that is attached to the object to be dried, saturate the container once with the vapor of the solvent, and then evaporate the solvent attached to the object to be dried to dry the object to be dried. The dried product is an exhaust gas purifying filter, the exhaust gas purifying filter is a ceramic porous body, and the exhaust gas purifying filter to which a catalyst solution in which a catalyst is dissolved or dispersed is attached is attached. A method for producing an exhaust gas purifying filter, comprising degassing the inside of the fine pores of the exhaust gas purifying filter before drying. The exhaust gas purification filter is a ceramic porous body, and before the exhaust gas purification filter to which a catalyst solution in which a catalyst is dissolved or dispersed in a solvent is attached is dried, the fine pores of the exhaust gas purification filter are deaerated. Then, after degassing, the same solvent as the solvent adhering to the exhaust gas purification filter is put into the container, the inside of the container is saturated with the vapor of the solvent, and then the solvent adhering to the exhaust gas purification filter A method for producing an exhaust gas purification filter, characterized by evaporating water and drying the exhaust gas purification filter. Heated by the warming heater, a hot air sent by the fan passes through the inside of the exhaust gas purifying filter catalyst solution adheres, according to claim 1 or 2, wherein the drying the filter for purifying exhaust gas Exhaust gas purification filter manufacturing method. Heated by the heater for heating and passed through the inside of the exhaust gas purification filter to which the catalyst liquid is attached after passing the hot air sent by the fan, passes through the vicinity of the cooling device, condenses the steam, and is heated again by the heater for heating. The method for producing an exhaust gas purification filter according to claim 1 or 2 , wherein the exhaust gas purification filter is dried to circulate. 5. A catalyst-carrying exhaust gas purification filter obtained by treating an exhaust gas purification filter to which a catalyst solution is adhered in the method for producing an exhaust gas purification filter according to claim 1 . 6. The catalyst-carrying exhaust gas purifying filter according to claim 5, wherein the catalyst is uniformly supported.

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