JPH0364164B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to the production of gas adsorption elements, particularly gas adsorption elements that are nonflammable, have excellent heat resistance, and can efficiently adsorb and remove moisture and/or harmful gases in air, other gases, or liquids to be treated. It is about law.

Conventionally, to remove gases such as water vapor, carbon dioxide, ammonia, hydrogen sulfide, etc. contained in the air and obtain dry or clean air, adsorption is carried out through a layer of particles such as activated carbon or silica gel packed in a packed tower. or remove the alkaline components, acidic components, etc. contained in the gas, e.g.
Methods have been used to absorb and remove hydrocarbon components, but all of these methods have the disadvantage that they cause a large pressure drop when processing the gas to be treated, such as air, and therefore require a large amount of power and large equipment.

It is an object of the present invention to provide a method for manufacturing a gas adsorption element that eliminates the above-mentioned drawbacks, retains dehumidification and other gas adsorption abilities, and allows easy removal, maintenance, and other operations. The object is achieved according to the invention by forming the gas adsorption element from ceramic containing a gas adsorption agent.

In the present invention, the gas adsorbent used is a porous particulate material having a huge number of micropores (5 to 50 Å in diameter), such as silica gel, alumina gel, or synthetic zeolite, which does not deliquesce or collapse due to moisture. Also, as the ceramic material, one is selected that can be sintered within a temperature range in which the fine pores of the gas adsorbent do not disappear when mixed with the gas adsorbent and fired.

The present invention will be explained in detail below with reference to Examples.

Example 1 100 parts of clay and synthetic zeolite powder (Davison Molecular from Fuji Davison Chemical Co., Ltd.)
Sieve3A) Add an appropriate amount of dispersant and binder to 40 to 200 parts, disperse in 150 to 300 parts of water, knead and mix thoroughly to form a semi-solid, and extrude it to form a semi-solid shape with both end faces as shown in Figure 1. Numerous small holes 1 that pass through the
A cylindrical molded body with a cylindrical shape is obtained, which is fired at 500 to 700°C for 8 hours to eliminate organic components, and the ceramic is sintered to form a cylindrical body with numerous small holes 1 penetrating through both end faces. A ceramic dehumidification or gas adsorption element in which zeolite is dispersed is obtained.

Example 2 FIG. 2 shows the first step of manufacturing a gas adsorption element, in which 2 and 3 are a pair of forming rollers having a desired tooth profile, which mesh with each other at the meshing part 4,
One forming roller 2 has many cut grooves 5 in the circumferential direction.
The other forming roller 3 is in contact with the pressure roller 6, and the surface speeds of both rollers are approximately the same. Reference numeral 7 denotes an adhesive applicator, which comprises an adhesive container 7a and an adhesive applicator roller 7b, and an adhesive 8 is put into the adhesive container 7a. Note that 9 and 10 are guide rollers.

Appropriate breathable sheets 11 and 12 such as paper, cloth, asbestos paper, ceramic paper, glass fiber paper, etc. are rolled up into a roll and prepared.
The thread 14 formed into a wave shape between the sheets 1 and 3 and fed from the bobbin 13 passes through the guide roller 10 and the cut groove 5, and both the sheet 11 and the thread 14 pass through the coating roller 7b.
After the adhesive 8 is applied, the sheet 12 is bonded together with the forming roller 3 and the pressure roller 6 to form a single wave molded body 15.

The single wave molded body 15 is rolled up into a cylindrical shape as shown in the figure, and then mixed with 50% clay, 30% feldspar, and 20% alumina gel powder.
The mixture was dipped twice in a slurry obtained by dispersing it in twice the amount of water, and after drying it was heated to room temperature to 300℃ 50℃/hr. 300 to 1000℃ 100℃/hr. 1000 to 1250℃ 50℃/hr. 1250℃ 1hr.Hold 1250~300℃ 11hr. 300℃~room temperature A gas adsorption ceramic made of ceramic in which fine particles of alumina gel are dispersed and fixed by firing under the condition of cooling outside the furnace to burn off the organic matter and sintering the ceramic. To obtain an element for total heat exchange.

Example 3 Ceramic raw materials: 56% clay, 38% limestone
100 parts of a fine powder mixture of 6% silica stone and 40 parts of water are thoroughly kneaded to form a semi-solid, which is extruded or molded into a large number of small particles that pass through both end faces as shown in Figure 1. After molding into a cylindrical molded body having through holes 1 and completely sintering it by firing at 1200°C for 8 hours, a fine powder mixture of low melting point ceramic such as 80% white lead, 8% kaolin, and 12% silica stone is prepared. 30-70 copies
Disperse 60 to 10 parts of alumina gel of 100 to 200 mesh in water using an appropriate dispersant to obtain 200 parts of slurry, immerse the above sintered product twice, and dry at 780℃.
By firing for about 7 hours before and after, a cylindrical ceramic element for dehumidification or total heat exchange in which alumina gel is dispersed and has a large number of small holes 1 passing through both end faces is obtained.

Embodiment 4 FIG. 3 shows a molding apparatus for a single-wave molded body substantially similar to that in FIG. 2, and the same parts as in FIG. 2 are designated by the same numbers. In the figure, reference numerals 16 and 17 indicate slurry dipping devices, which include slurry containers 16a and 17a and an application roller 16, respectively.
b, 17b. 18a, 18b, 19a,
19b is a squeezing roller, 20 and 21 are infrared heaters and other appropriate heaters, and 22 is a guide roller.

A slurry is obtained by dispersing 20 to 50 parts of clay such as Honbushi clay and Frogme clay and 80 to 50 parts of synthetic zeolite powder (Davison Molecular Sieve 4A from Fuji Davison Chemical Co., Ltd.) in 100 parts of water.
24 is placed in slurry containers 16a and 17a, and a 20% aqueous solution of water glass is placed in adhesive container 7a as adhesive 8, and substantially the lower half of application rollers 16b, 17b and 7b is immersed in each case.

Sheets 11 and 12 having fine pores such as paper, cloth, and nonwoven fabric are rolled up and prepared, and both sheets 11 and 12 are applied to coating rollers 16b and 17b, immersed in slurry 23 and 24, and squeezed by squeezing rollers 18a and 1.
9a, the excess slurry is squeezed out and removed by heater 2.
Dry with 0, 21, squeeze roller 1 as necessary.
8b and 19b to make the thickness uniform, the sheet 11a impregnated with the slurry 23 is passed through forming rollers 2 and 3.
After applying the adhesive 8 to the ridgeline portion of the waves of the corrugated sheet 11b, the sheet is passed between the forming roller 3 and the pressure roller 6 together with the planar sheet 12a impregnated with the slurry 24. The single-wave molded product 15 obtained is then rolled up.
The single wave molded body 15 is attached to the adhesive container 2 as shown in FIG.
An adhesive 26 is applied to the ridgeline portion of the corrugated sheet by an adhesive applicator 25 consisting of an adhesive applicator 5a and an applicator roller 25b, and the single-corrugated molded body 15 is applied to a ceramic core material 27.
Roll it up into a cylindrical shape.

After drying the cylindrical single wave molded body, put it in a furnace and heat it at room temperature to 350℃ 50℃/hr. 350℃ 1hr. Hold 350~500℃ 100℃/hr. 500℃ Approx. 5hr. Hold 500~200℃ Inside the furnace It is fired under the conditions of slow cooling at 200℃ to room temperature outside the furnace, and as shown in Figure 5, it has a cylindrical shape with a large number of small holes 1 penetrating through both end faces on the outer surface and the surface of each small hole. A ceramic dehumidification or total heat exchange element in which fine particles of synthetic zeolite are dispersed and fixed is obtained.

Example 5 10 g of feldspar, 125 g of petalite, 50 g of talc, 12 g of glass powder, and 7 g of gum arabic were adjusted and mixed into fine powder of 100 mesh or less each, and mixed with 60 g of aqueous emulsion of polyvinyl acetate (evaporation residue 41%) and 10 g of water.
Aqueous suspensions 23 and 24 are obtained (FIG. 3), which are placed in containers 16a and 17a, and parts of coating rollers 16b and 17b are immersed therein.

Sheets 11 and 12 having fine pores such as paper, cloth, and non-woven fabric are rolled up and prepared, and both sheets 11 and 12 are applied to application rollers 16b and 17b and dipped in suspensions 23 and 24, squeezed by squeezing rollers 18a, 1
Excess suspension is squeezed out using 9a, dried using heaters 20 and 21, and squeezed by squeezing roller 1 as necessary.
8b, 19b to make the thickness uniform, the sheet 11a impregnated with the suspension 23 is passed through the forming rollers 2,
After applying the adhesive 8 to the ridgeline portion of the waves of the corrugated sheet 11b, the forming roller 3 and the pressure roller 6 are bonded together with the planar sheet 12a impregnated with the suspension liquid 24. They are adhered to each other through the gaps, and the obtained single-wave molded product 15 is rolled up.

After cutting the single wave molded body 15 into a square, rectangle, parallelogram, etc., as shown in FIG. 6, an adhesive container 28a,
The adhesive 29 is applied to the ridgeline portion of the corrugated sheet through the gap between the rollers of the adhesive applicator 28 consisting of the applicator roller 28b and the presser roller 28c, and the single-wave molded product 15 is suitably coated so that the directions of the waves are perpendicular to each other. After stacking several sheets and drying them, put them in an oven at room temperature ~ 300℃ 50℃/hr. 300~1000℃ 100℃/hr. 1000~1200℃ 50℃/hr. 1200℃ 1hr.Hold 1200~300℃ 10hr. 300℃~room temperature Fired outside the furnace under conditions of cooling. By this heating, all the organic components in the corrugated sheet 11b, the flat sheet 12a, and the adhesive are burned out, and the thin flat sheet of porous ceramic and the corrugated sheet are sintered together to form an integral rectangular parallelepiped. . Here, low melting point ceramics, such as 30 to 70 parts of a fine powder mixture of 80% lead white, 8% kaolin, and 12% silica stone, and 60 to 10 parts of fine granular silica gel of 100 to 200 mesh are combined with gum arabic, carboxymethyl cellulose, and silica. Add a suitable binder such as vinyl alcohol and disperse in 100 parts of water to obtain a slurry.
The above-mentioned rectangular cylindrical sintered ceramic was immersed twice, dried, and then refired under almost the same conditions as in Example 4. As shown in FIG. A dispersed ceramic element for gas adsorption or total heat exchange is obtained.

As shown in the above embodiments, the sheet materials used as the substrate in the present invention include fabrics with low ash content, kraft paper, etc., as well as materials with significantly high incombustible content, such as asbestos paper, ceramic fiber paper, and glass fiber cloth, or non-combustible materials at all. May be used similarly.

In addition, silica gel, alumina gel, and synthetic zeolite were used as gas adsorbents in the above examples, but
Other than these, any solid adsorbent may be selected as long as it does not lose its activity upon calcination and maintains a suitable adsorption activity. In other words, when the calcination temperature is too high for the silica gel, alumina gel, and synthetic zeolite of the above examples, the active surface area decreases and the desired gas adsorption ability is lost.

The cylindrical element shown in Figures 1 and 5 adsorbs water and active components in the fluid by passing gas or other processing fluid through its small holes in a stationary state, and when the element is saturated with the adsorbed components, Alternatively, as shown in FIG. 8, the gas adsorption zone 32 and desorption zone 33 can be separated by holding the casing 30 in a casing 30 such that it can be driven and rotated by a motor M as shown in FIG. The treated air A is introduced into the gas adsorption zone 32 while rotating the element at a low speed to perform gas adsorption and dehumidification. When the gas or moisture is saturated, the treated air A is introduced into the desorption zone 33 while the element is rotating. It is held in a casing 30 so that it can be desorbed through high-temperature water vapor or air B, and can be driven and rotated by a motor M as shown in FIG. While rotating the element at low speed, outside air is sent to the intake zone 34 and return air is sent to the exhaust zone 35.
By introducing RA, total heat exchange can be performed between outside air OA and return air RA. In addition, the cross-flow type element shown in Fig. 7 has a group of small through holes that are orthogonal to each other as shown in Fig. 10.
By introducing the air, the active gas contained in both gases can be adsorbed, and total heat can be exchanged between the outside air OA and the return air RA.

The silica gel, alumina gel, and synthetic zeolite mentioned above all have high hygroscopicity and ability to adsorb gases such as ammonia, carbon dioxide, and hydrogen sulfide.Alumina gel and synthetic zeolite in particular have excellent hygroscopicity even at temperatures of 100°C or higher. In addition to having
Conventional absorbent moisture absorbers such as lithium chloride and calcium chloride gradually form an aqueous solution when they capture moisture, absorb moisture endlessly, and eventually destroy the block matrix due to excessive moisture absorption. When the adsorbent is saturated with the adsorbed substance, for example, water, the adsorption does not proceed any further and there is no phase change. Furthermore, in the present invention, a porous ceramic material with a significantly large specific surface area is used as a carrier for the adsorbent. This makes it possible to effectively dehumidify fluids and adsorb gases, and when using synthetic zeolite, it is possible to obtain dry gas with a significantly low dew point by using high-temperature regenerated air. The pressure loss due to passage is small, heat regeneration can be carried out with high efficiency, it can be effectively used in a wide range of fluid treatments, and it can be manufactured reliably and easily.

[Brief explanation of drawings]

FIG. 1 is a perspective explanatory view showing an example of a gas adsorption element obtained by the present invention, FIG. 2 is a perspective view showing the first step of another embodiment of the present invention, and FIG. A partially cutaway front view showing the first step of another example, FIG. 4 is a sectional view of the main part showing the second step, and FIG. 5 is a perspective explanatory view showing the product obtained by the same method. FIG. 6 is an explanatory cross-sectional view of the main part showing the second step of still another embodiment of the present invention, FIG. 7 is an explanatory perspective view showing a product obtained by the same method, and FIGS. 8 to 10 are It is an explanatory view showing an example of the usage state of the element for gas adsorption obtained by the present invention. In the figure, 2 and 3 are forming rollers, 6 is a pressure roller,
7, 25, 28 are adhesive application devices, 16, 17 are ceramic slurry dipping devices, 18a, 18b, 19
a and 19b are squeezing rollers, and 20 and 21 are heaters.

Claims (1)

[Scope of Claims] 1. Formed into a block having a large number of small holes passing through both end faces using ceramic slurry mixed with a gas adsorbent, and then heated and sintered at a temperature that does not deactivate the gas adsorbent. A method for manufacturing a gas adsorption element characterized by: 2. The method for producing a gas adsorption element according to claim 1, wherein the gas adsorption agent is a moisture absorbent and the gas adsorption element is a dehumidification element. 3. A gas adsorption element according to claim 1 or 2, which is formed by molding or extrusion molding or extrusion molding a ceramic slurry mixed with a gas adsorbent into a block having a large number of small holes penetrating through both end faces. manufacturing method. 4 A porous sheet is formed into a block having a large number of small holes penetrating through both end faces, the block is immersed in ceramic slurry mixed with a gas adsorbent, and heated to a temperature that does not deactivate the gas adsorbent. A method for manufacturing a gas adsorption element according to claim 1 or 2, wherein the organic components in the porous sheet are burnt out and the ceramic is sintered. 5. A porous sheet is immersed in ceramic slurry mixed with a gas adsorbent, and after semi-drying the ceramic slurry impregnated into the porous sheet, it is shaped into a block having a large number of small holes penetrating both end faces. 3. The method for producing a gas adsorption element according to claim 1, wherein the organic components in the porous sheet are burned out by heating to a temperature at which the gas adsorption agent is not deactivated, and the ceramic is sintered. 6 Ceramic slurry is molded or extruded into a block having a large number of small holes penetrating through both end faces, then heated and sintered to form a block, and the block is placed in ceramic slurry mixed with a gas adsorbent. A method for producing a gas adsorption element, which comprises immersing it and resintering it at a temperature that does not deactivate the gas adsorption agent. 7. A porous sheet is immersed in ceramic slurry, and after the ceramic slurry impregnated into the porous sheet is semi-dried, it is formed into a block shape having a large number of small holes penetrating through both end faces, and the porous sheet is heated. At the same time, the organic components of the block are burned out, and the ceramic is sintered to form a block with many small holes penetrating through both end faces.The block is immersed in ceramic slurry mixed with a gas adsorbent, and the gas adsorbent is 7. The method for producing a gas adsorption element according to claim 6, wherein the gas adsorption element is resintered at a temperature that does not cause deactivation. 8. The method for producing a gas adsorption element according to claim 6 or 7, wherein the gas adsorption agent is a moisture absorbent and the gas adsorption element is a dehumidification element.