JP3007307B2 - Hollow cylindrical molded adsorbent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solvent recovery apparatus or water purification apparatus for recovering organic solvent gas contained in exhaust gas from a paint factory or the like and CFC gas generated from an ultrasonic cleaner used in a semiconductor factory or the like. The present invention relates to a hollow cylindrical molded adsorbent made of activated carbon fiber for use as a filter or the like in a vessel.

[0002]

2. Description of the Related Art As a filter as described above, a filter containing activated carbon fibers or reinforcing fibers therein is generally used, for example, a hollow cylindrical shaped adsorbent 01 as shown in a perspective view of FIG. Or a disk shape, and the molded adsorbent is provided in the middle of the flow path of various fluids to be treated such as an organic solvent gas, a fluorocarbon gas, and water.

[0003]

However, the conventional one has a drawback that it is difficult to handle the filter or the like due to the low strength of the activated carbon fiber. Powder was generated, and there was a disadvantage that the weight was reduced at an early stage and had to be replaced frequently, which was uneconomical.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide a filter or the like which has excellent durability and can be easily manufactured.

[0005]

The hollow cylindrical shaped adsorbent of the invention according to claim 1 is produced at a time by a papermaking method.
A hollow cylindrical shaped adsorbent, in order to achieve the object as described above, the inner surface or the outer surface of the activated carbon fiber of the papermaking structure to which the activated carbon fibers are adhered by an adhesive. A crab nonwoven fabric , and the activated carbon
The fiber and the non-woven fabric are in intimate contact with each other on the entire surface facing each other.
In this state, it is adhered by the adhesive and the entire circumference
The thickness of the activated carbon fiber in the radial direction is uniform
It is characterized by having a hollow cylindrical shape .

Here, the term "hollow cylindrical shape" refers to a shape having a depth and a thickness as well as a surface spread. Therefore, the hollow cylindrical shape excludes, for example, a thin plate-like shape, a thin sheet formed into a corrugated shape, and the like.

The activated carbon fiber may be appropriately selected from rayon, polyacrylonitrile (PAN), phenolic resin, coal pitch, petroleum pitch, etc. according to the field of use of the molded adsorbent. And, usually, the fiber diameter is about 2 to 30 μm and the fiber length is 0.5 to 10 mm
It is preferable to use those having fine pores having a pore diameter of about 10 to 25 ° and a nominal specific surface area of about 500 to 2500 m ² / g. The content of the activated carbon fibers is 50 to 95% by weight based on the total weight of the molded adsorbent. If it is less than 50% by weight, the amount of the activated carbon fiber is small, and the adsorption performance to the solvent is reduced,
On the other hand, if it exceeds 95% by weight, the strength is reduced.

Examples of the material of the nonwoven fabric include synthetic fibers such as polypropylene fibers, polyvinyl alcohol fibers, polyacrylonitrile fibers, polyvinyl chloride fibers, polyester fibers, and polyethylene fibers, and inorganic fibers such as glass fibers. Used.

As the adhesive for improving the adhesion between the activated carbon fibers, fibers for an adhesive such as hemp and pulp, and a hot-melt synthetic resin are used. For hemp or pulp respectively, the fiber length is
What is defibrated into short chips of about 0.5 to 10 mm, and then subjected to pressure and pretreated so as to have folds on the surface, so-called lossoids are used. These hemp or pulp,
Alternatively, each of the two
66% by weight, preferably about 3% by weight.

As described above, when hemp or pulp or a mixture of both is used as the adhesive,
A small amount of epoxy resin may be contained in order to enhance the adhesiveness during drying.

The above-mentioned hot-melt synthetic resin has a melting point of
Those having a temperature of about 50 to 200 ° C. are suitable, and polyethylene, polypropylene, polyvinyl alcohol, polyacrylonitrile and the like are used, and polyacrylonitrile is particularly suitable. In addition, if a heat-fusible synthetic resin is used, it is less likely to block the pores of the activated carbon fiber, and a yarn diameter of about 5 to 100 μm and a length of about 0.5 to 10 mm is used. Is preferred. As such a thread-like heat-fusible synthetic resin, one having a structure in which the surface of a high-melting fiber yarn that does not melt or change at the heating temperature during the production of a molded adsorbent and is coated with the heat-fusible synthetic resin may be used. .

The amount of the hot-melt synthetic resin to be added to 100 parts by weight of the activated carbon fiber is preferably about 5 to 40 parts by weight. If the blending amount of the hot-melt synthetic resin is small, the strength of the molded adsorbent decreases, while if the blending amount is large, the pores of the activated carbon fiber are blocked, the porosity decreases, and the solvent adsorption performance decreases. Because you do.

When a fine powder of activated carbon fiber is prevented from being scattered to the outflow side of the fluid to be treated by using it as a filter, a nonwoven fabric can be adhered only to the surface of the activated carbon fiber on the outflow side of the fluid to be treated. good.

The hollow cylindrical shaped adsorbent according to the present invention, in a state where the nonwoven fabric is in contact with the water-absorbing surface, sucks the slurry containing activated carbon fibers from the water-absorbing surface, and activates the active material to which the nonwoven fabric is attached. After obtaining the carbon fiber molded body, the activated carbon fiber molded body is dried to produce the activated carbon fiber molded body.

As the water absorption surface, there is a water absorption surface formed by providing a water passage hole in a peripheral surface of a hollow cylindrical body.

The concentration of the solid content in the aqueous slurry is preferably about 0.1 to 2% by weight from the viewpoint of easy handling and molding. The aqueous slurry may be beaten in accordance with a conventional method, and a dispersant, a stabilizer, a viscosity modifier, a paper strength enhancer, a retention aid, etc. may be added as long as the performance of the molded adsorbent is not hindered. May be.

In order to enhance the strength of the molded adsorbent, it is preferable to use non-heat-meltable fibers as a reinforcing material. As such non-heat-fusible fiber, any fiber that does not melt or deteriorate at the drying heating temperature during the production of the molded adsorbent may be used. Usually, glass fiber, inorganic fiber such as alumina fiber, general-purpose carbon fiber, polyamide fiber Synthetic fibers such as high-melting-point polyethylene fibers, high-melting-point polypropylene fibers, high-melting-point polyacrylonitrile fibers, semi-synthetic fibers such as rayon, pulp fibers, etc. are used. Is preferably about 2 to 100 μm, and the fiber length is preferably about 0.5 to 10 mm from the viewpoints of the dispersibility in the aqueous slurry and the reinforcing effect at the time of manufacturing the molded adsorbent. The blending amount of the non-heat-fusible fiber with respect to 100 parts by weight of the activated carbon fibers is preferably about 5 to 80 parts by weight. If the amount is small, the reinforcing effect is reduced. On the other hand, if the amount is large, the amount of activated carbon fibers contained in the molded adsorbent per unit weight is reduced, and the solvent adsorption performance is reduced. The suction of the aqueous slurry is performed using a water-absorbing member having small water holes.

[0018]

According to the construction of the hollow cylindrical shaped adsorbent of the invention according to claim 1, the activated carbon fibers are bonded to each other by an adhesive material on either the inner peripheral surface or the outer peripheral surface of the activated carbon fibers of the papermaking structure. , The same adhesion as contacting activated carbon fibers
The non-woven fabric is attached so that
In addition, the thickness of the activated carbon fiber in the radial direction
It has a hollow cylindrical shape with uniform uniformity, and the adsorption performance is
The active carbon fiber can be reinforced with a nonwoven fabric and the active carbon fiber can be prevented from being pulverized, while the circumference can be made uniform and the adsorption surface area per unit volume can be increased.

[0019]

Next, embodiments of the present invention will be described in detail with reference to the drawings. Embodiment of Molded Adsorbent First Embodiment FIG. 1 is an overall perspective view of a molded adsorbent according to a first embodiment of the present invention. In this figure, reference numeral 1 denotes a cylindrical molded adsorbent having a hollow cylindrical shape containing activated carbon fibers, and a first nonwoven fabric 2 made of polypropylene is adhered to the inner peripheral surface of the molded adsorbent 1 and molded. An adsorbent 1A is formed. The molded adsorbent 1 was composed of 70% by weight of a pitch-based activated carbon fiber having a nominal specific surface area of 1500 m ² / g (A-15: manufactured by Adol Co., Ltd.), 23% by weight of a pitch-based general-purpose carbon fiber as a reinforcing material, and 23% by weight. It is configured to contain 7% by weight of acrylic fiber as a fusible fiber. Second Embodiment FIG. 2 is an overall perspective view of a second embodiment of a molded adsorbent according to the present invention, showing a first molded adsorbent 1 containing activated carbon fibers.
a, a first nonwoven fabric 2 made of polypropylene is attached to the inner peripheral surface, an insulating second nonwoven fabric 3 is attached to the outer peripheral surface, and activated carbon fibers are further applied to the outer peripheral surface of the second nonwoven fabric 3. The second adsorbent 1b containing the second adsorbent 1b is attached to form the adsorbent 1B. The molded adsorbers 1a and 1b
70% by weight of pitch-based activated carbon fiber (A-15: manufactured by Ador Co., Ltd.) having a nominal specific surface area of 1500 m ² / g, 25% by weight of pitch-based general-purpose carbon fiber as a reinforcing material,
It is configured to contain 5% by weight of a polyacrylonitrile-based fiber (Cashmilon: manufactured by Asahi Kasei Corporation) as a heat-meltable fiber. The second non-woven fabric 3 contains 40% by weight of glass fiber,
15% by weight of pulp, 30% by weight of silica powder, 10% by weight of titanium oxide, 5% by weight of polyacrylonitrile fiber (Cashmilon: manufactured by Asahi Kasei Kogyo Co., Ltd.), and aramid fiber (Cornex:
1% by weight (manufactured by Teijin Limited). Next, a method for manufacturing the molded adsorbent 1B of the second embodiment will be described. First, a suction mold used for manufacturing will be described. As shown in a partially cutaway side view of FIG. 3A, a flange 12 is connected to a tubular water-absorbing member 11, and A pipe connecting portion 13 is connected, and small water holes 14 are provided on the entire peripheral surface of the water absorbing member 11 to form a suction mold 15. As shown in FIG. 3B, the water absorbing member 11 has a band-shaped first nonwoven fabric 2, and has a margin portion 16 having a predetermined width at each of both ends in the width direction with respect to the suction molding die 15. And wrap it at an angle. After that, the nominal specific surface area is 1500
70% by weight of m ² / g pitch-based activated carbon fiber (A-15: manufactured by Adol Co., Ltd.), 25% by weight of pitch-based general-purpose carbon fiber as a reinforcing material, and polyacrylonitrile-based fiber as a heat-meltable fiber ( (Cashmilon: manufactured by Asahi Kasei Kogyo Co., Ltd.) Disperse in 25% of the total weight of water so that it contains 5% by weight, beat it until each fiber length becomes 1 to 5 mm, and make a uniform aqueous slurry. Was adjusted. Then, the obtained aqueous slurry is accommodated in a slurry tank 17 as shown in a vertical sectional view of FIG.
7, a suction mold 15 connected to a vacuum pump (not shown) is immersed in a pipe connection portion 13 via a pipe 18, and a suction force is applied to the aqueous mold 15 so that the aqueous slurry is formed.
Flow suction to the side. Along with this, the respective fibers are suction-agglomerated around the suction mold 15 and subjected to dehydration molding to obtain a wet molded adsorbent. Then, as shown in FIG. 3D, the second nonwoven fabric 3 is wound around the wet molded adsorbent in the same manner as described above, as shown in FIG.
Thereafter, the fibers are immersed again in the slurry tank 17, and the respective fibers are suction-agglomerated around the second nonwoven fabric 3 to be subjected to dehydration molding.
As shown in (e), a molded adsorbent in a wet state is obtained.
In this case, suction molding is performed with the surface of the molded adsorbent obtained by the first-stage suction molding die 15 serving as a water-absorbing surface. After a while
The molded adsorbent is taken out of the slurry tank 17 and pulled out of the suction mold 15 and then dried by heating at 130 ° C. for 120 minutes.
B is manufactured. Then, although not shown, the molded adsorbent 1B is externally fitted to a tubular adsorption tower member having a large number of ventilation holes to constitute a water purifier as an adsorption element, and is used by being attached to a water supply cull or the like. I do. When manufacturing the molded adsorbent 1A of the first embodiment, the first nonwoven fabric 2 is wound using the same suction mold 15 as that of the second embodiment, and the respective fibers are suction-agglomerated through the first nonwoven fabric 2. Then, the obtained molded adsorbent in a wet state is preferably taken out of the slurry tank 17 and dried. Further, the second nonwoven fabric is wound around and adhered to the outer surface of the molded adsorbent via an adhesive, and is removed from the suction mold 15, whereby a molded adsorbent having nonwoven fabrics on both the inner and outer surfaces is obtained. In the case of the molded adsorbent 1A of the first embodiment, when a heat-adhesive material is used as the second nonwoven fabric, the wet molded adsorbent may be dried after winding the second nonwoven fabric. , Its second
A part of the nonwoven fabric is dissolved, and the second nonwoven fabric can be adhered to the molded adsorbent 1 with the subsequent cooling, and the adhesive can be made unnecessary. <Modified Example of Suction Mold> FIG. 4A is a partially cutaway perspective view showing a modified example of the suction mold, and has a bottomed cylindrical shape and small water holes 14 over the entire peripheral surface.
The outer cylinder 19 is connected to the upper end of the water-absorbing member 11 provided with a suction pipe, and a suction space S is provided between the water-absorbing member 11 and the outer cylinder 19.
Are formed, and the pipe connecting portion 13 is connected to the lower portion of the outer cylinder 19 to form the suction mold 15. As shown in the vertical cross-sectional view of FIG. 4B, the above-described case where the tubular nonwoven fabric 2 is in contact with the inner peripheral surface of the water-absorbing member 11 as shown in FIG. In the same manner as described above, the aqueous slurry is immersed in the slurry tank 17 and a suction force is applied by a vacuum pump (not shown) connected to the pipe connection portion 13 to flow and suction the aqueous slurry to the suction mold 15 side.
The above-mentioned fibers are suction-agglomerated and dehydrated and formed on the inner peripheral surface of the nonwoven fabric 2, and a cylindrical molded adsorbent 1 containing activated carbon fibers is adhered to the inner peripheral surface side of the nonwoven fabric 2 in a wet state. I am getting a body. The hollow cylindrical shaped adsorbent according to the present invention is not limited to removing iron rust, odorous substances, free chlorine, and the like from tap water as a filter for a water purifier, and smoke as a filter for an air purifier or an air conditioner. The present invention can be applied to various uses such as removal of odorous substances or humidity control, recovery of a solvent in a plating factory, a chemical factory, a cleaning industry, and the like, and removal of solids in mineral oil and vegetable oil.

[0020]

As is clear from the above description, according to the hollow cylindrical shaped adsorbent of the first aspect of the present invention, the activated carbon fibers of the papermaking structure are reinforced by the nonwoven fabric and the activated carbon fibers are pulverized. Can improve the overall strength, it is easy to handle when constructing filters etc., it is advantageous in terms of production, and it can suppress the loss of activated carbon fiber, has excellent durability, and reduces the frequency of replacement It is economical. Further, when used as a filter, if a nonwoven fabric is attached to the activated carbon fiber on the side of the fluid to be treated, not only the strength can be improved but also the scattering of the fine powder of the activated carbon fiber can be prevented, and the replacement frequency can be further improved. Can be reduced. Moreover, activated carbon fiber of papermaking structure and non-woven
Close the fabric and contact the activated carbon fibers.
With the same adhesive and half the circumference.
Excellent durability with uniform thickness of activated carbon fiber in the radial direction
Since a hollow cylindrical shaped adsorbent is obtained,
Adsorption surface area can be increased.
The suction performance can be reduced in the entire circumferential direction while being compact.
The area around which the fluid to be treated flows can be
You can now increase. Also, the same adhesive
Bonding the non-woven carbon fibers and the non-woven fabric
Therefore, they are made at once by the papermaking method.
It is economical because it can be easily manufactured with few processes.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a molded adsorbent of a first embodiment.

FIG. 2 is an overall perspective view of a molded adsorbent of a second embodiment.

FIG. 3 is an explanatory view of a method for producing a molded adsorbent, and (a)
Is a partially cutaway side view of the suction mold used for manufacturing,
(B) is a side view showing a state in which the first nonwoven fabric is wound, (c) is a longitudinal sectional view showing a suction molding state, (d) is
Side view showing a state in which the second nonwoven fabric is wound, (e).
FIG. 4 is a side view showing a state in which the molded adsorbent in a wet state of the second embodiment is dehydrated and molded.

FIG. 4A is a partially cutaway perspective view showing a modified example of the suction molding die, and FIG. 4B is a longitudinal sectional view showing a suction molding state.

FIG. 5 is an overall perspective view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 molded adsorbent 1a first molded adsorbent 1b second molded adsorbent 2 first nonwoven fabric 3 second nonwoven fabric

Continuation of the front page (72) Inventor Takeshi Maeda 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (56) References JP-A-61-278319 (JP, A) Jika-sho 54- 101209 (JP, U) Japanese Utility Model Showa 55-16880 (JP, U) Japanese Utility Model Showa 63-94527 (JP, U) Japanese Utility Model Utility Model Showa 55-6024 (JP, U) Japanese Utility Model Showa 63-23942 (JP, Y2) (58) Field surveyed (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B01D 39/00-39/20 B01D 53/00-53/36 C02F 1/28 D21J 3/10

Claims (3)

(57) [Claims] 1. A nonwoven fabric is disposed on either the inner peripheral surface or the outer peripheral surface of an activated carbon fiber having a papermaking structure in which activated carbon fibers are bonded to each other by an adhesive , and said activated carbon fiber is
The fibers and the nonwoven fabric are in close contact with each other
While being adhered by the adhesive, and
In the case where the thickness of the activated carbon fiber in the radial direction is uniform
Once by the papermaking method characterized by being hollow
The hollow cylindrical shaped adsorbent produced in the above. 2. The hollow cylindrical shaped adsorbent according to claim 1, wherein the adhesive is hemp, pulp, or a hot-melt synthetic resin. 3. The hollow cylindrical shaped adsorbent according to claim 1, wherein the reinforcing material contains non-heat-fusible fibers.