JP2002153717A - Gas removing filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chemical filter for treating a circulating system constituted so that a part of the constituent parts of the filter can be reutilized after use, a filter unit having the chemical filter incorporated therein and a method for recovering a filter base material. SOLUTION: In the gas removing filter 4 constituted by almost parallelly arranging filter pieces 3 each formed by bonding an adsorbent 2 to the filter base material 1 by an adhesive so as to pass target gas through the gaps between the filter pieces 3, the adhesive comprises a water soluble adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas removal filter for adsorbing and filtering odors and harmful gases, and more particularly to a method for collecting a substrate used in a used filter.
The present invention relates to a gas removal filter that can be reused, a filter unit incorporating the same, and a method of collecting a filter substrate.

[0002]

2. Description of the Related Art An adsorbent-filled chemical filter, which is mainly used for treating outside air, is used continuously by replacing only the internal adsorbent after use. The parts have been reused. But,
Adsorbent-filled chemical filters have drawbacks such as high pressure loss and high dust generation due to their structure, and are characterized by low pressure loss and low dust generation, which are constructed by carrying an adsorbent on a substrate. Attention has been paid to chemical filters for system processing.

[0003] As the chemical filter for circulating system treatment, there are a filter formed by supporting an adsorbent on a urethane foam and a filter formed by forming activated carbon fibers in a honeycomb shape.
However, after using the chemical filter for circulating system treatment, it is treated as industrial waste and is not reused as a filter for circulating system.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and an object of the present invention is to make it possible to reuse a part of the component after use of the filter. An object of the present invention is to provide a circulating system treatment chemical filter, a filter unit incorporating the same, and a method of collecting a filter substrate.

[0005]

According to the present invention, there is provided a gas removing filter comprising a filter piece formed by adsorbing an adsorbent onto a filter base material by an adhesive so that a target gas flows between the filter pieces. A gas removing filter comprising a plurality of filters arranged substantially in parallel, wherein the adhesive is made of a water-soluble resin, thereby achieving the above object.

In one embodiment, the filter substrate is a thin plate made of aluminum or polyester.

[0007] In one embodiment, the adsorbent is activated carbon or an ion exchange resin, and the adhesive is a polyvinyl alcohol-based adhesive.

[0008] In the filter unit of the present invention, the gas removing filter is detachably attached to the filter housing.

[0009] The method for recovering a filter base material of the present invention includes a step of removing a gas removing filter from the filter unit, and a step of immersing the gas removing filter in water or hot water.

[0010] In one embodiment, the step of immersing the gas removal filter in water or hot water further comprises:
And a step of treating with an ultrasonic cleaner.

The operation of the present invention is as follows.

[0012] In a filter comprising a plurality of filter pieces formed by adsorbing an adsorbent onto a filter base material with an adhesive and arranged substantially in parallel so that a target gas flows between the filter pieces, Since the filter is made of a water-soluble resin, the filter can be immersed in water or warm water to dissolve the adhesive, separate the adsorbent from the surface of the substrate, and isolate only the substrate.

[0013] When the filter is immersed in water or hot water, treatment with an ultrasonic cleaner can accelerate the dissolution of the adhesive and speed up the isolation of the substrate.

As described above, in the used chemical filter, only the filter substrate can be isolated from the adhesive and the adsorbent and reused.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

As shown in FIGS. 1 to 3, in the gas removal filter 4 of the present invention, the adsorbent 2 is fixed to the front and back surfaces of the filter substrate 1 by an adhesive layer adhered to the filter substrate 1. Many filter pieces 3 are arranged substantially in parallel.

As shown in FIG. 1, the filter 4 is formed by bending a plate-like member into a corrugated plate and providing slits 6 at peaks and valleys to connect the filter pieces 3 to each other at both ends. May be formed. Alternatively, as shown in FIG. 2, a plurality of strip-shaped filter pieces 3 may be arranged at small intervals, and the filter pieces 3 may be connected to each other by a connecting member 9.

As shown in FIG. 4, the filter unit 5
Has a housing 9 having a frame member 7 made of aluminum or the like and a fan 8, and the filter 4 is provided in the frame member 7.
Are arranged. The filter 4 is detachably attached to the frame member 7.

The airflow generated by the rotation of the fan 8 passes through the slit 6 formed between the filter pieces 3 in the filter unit 5 and is adsorbed by the adsorbent 2 present on the outer surface of the filter piece 3 at that time.

Examples of the filter substrate 1 used in the present invention include a metal foil such as an aluminum foil, a synthetic resin such as polyester and nylon, and a ceramic thin plate.

The adhesive used in the present invention is a water-soluble adhesive, and polyvinyl alcohol, gelatin, cellulose and the like can be used.

Also, an adhesive which can be easily separated from the surface of the filter substrate by immersion in water (including hot water) can be used. For example, there is a temperature-sensitive adhesive (Intelimer, manufactured by Nitta Corporation) whose adhesive strength is greatly reduced at low temperatures.

Conventionally used emulsion-based adhesives, solvent-based adhesives, and non-solvent-based adhesives cannot be used in the present invention because they are difficult to peel off from the filter substrate.

As the adsorbent 2 used in the present invention, there are granular activated carbon, inorganic adsorbent, chemical-impregnated activated carbon, ion-exchange resin, and chemical-impregnated inorganic adsorbent. Specifically, granular activated carbon includes spherical activated carbon, pulverized activated carbon, crushed activated carbon, and granulated activated carbon, and inorganic adsorbents include silica gel, alumina, activated clay, and zeolite. Also, the adhesive
A metal catalyst such as titanium oxide, copper oxide, and nickel, and a flame retardant auxiliary may be added.

Preferred adsorbents are adsorbents such as granular activated carbon, activated silica, alumina, activated clay, and zeolite, and the particle size is preferably 0.1 to 1.5 mm.

Next, an example of a method of manufacturing the filter piece 3 having the above configuration will be described below.

An adhesive is applied to the filter substrate 1. Pre-dry until the viscosity of the adhesive is approximately 50,000 cps. The drying condition is usually 40 to 100 ° C. and 1 hour.
Preferably 10 minutes to 10 minutes. Next, the adsorbent 2 is sprayed on the filter substrate 1 on which the adhesive has been applied and dried (sprinkled from above). The particulate adsorbent 2 adheres to the filter substrate 1 with an adhesive. Thus, the filter piece 3
Is obtained.

The collection of the filter substrate 1 from the used filter unit 5 is performed as follows.

The filter 4 is removed from the filter unit 5, and the filter 4 is immersed in water for a predetermined time. The immersion temperature can be, for example, a temperature of 20 to 50 ° C.
The immersion time can be, for example, about 1 to 8 hours.

By this immersion treatment, the adhesive is dissolved and the adsorbent is separated from the surface of the substrate, and only the substrate 1 can be isolated.

When the gas removal filter is immersed in water,
The filter may be cleaned using an ultrasonic cleaner. By doing so, the isolation of the filter substrate can be promoted.

[0032]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples.

(Example) An adhesive was applied to the front and back surfaces of the filter substrate 1. Next, the adsorbent was sprinkled on the filter substrate 1. The particulate adsorbent is applied to the filter substrate 1 by an adhesive.
Adhered to. Thus, a filter 4 as shown in FIG. 1 was obtained.

The materials used are as follows.

Filter substrate: aluminum piece (made of Tokai aluminum foil) Adsorbent: crushed charcoal Kuraray Coal GW-H (made by Kuraray Chemical) Adhesive: polyvinyl alcohol resin Poval PVA-
217 (manufactured by Kuraray) Next, the filter was immersed in water under the following conditions. The adhesive was dissolved on the remaining surface of the filter substrate, and the adsorbent was separated from the surface of the filter substrate. Ultrasonic cleaner: US-4 (manufactured by SND) Bathtub temperature: room temperature, 45 ° C Ultrasonic cleaning time: 0, 10 minutes, 30 minutes

(Comparative Example) A filter was obtained in the same manner as in the Example except that an acrylic emulsion adhesive and Boncoat R3310 (manufactured by DIC) were used as the adhesive. This filter was immersed in the same manner as in Example 1.

Table 1 shows the results of the above Examples and Comparative Examples.

[0038]

[Table 1]

[0039]

According to the present invention, in a filter which has conventionally been disposed of, the filter base material can be reused, resources can be effectively used, and the amount of waste can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a filter substrate used in a gas removal filter of the present invention.

FIG. 2 is a perspective view of another embodiment of the filter base material used in the gas removal filter of the present invention.

FIG. 3 is a cross-sectional view of a filter substrate, showing a state before and after immersion processing.

FIG. 4 is a schematic view of an embodiment of the filter unit of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter base material 2 Adsorbent 3 Filter piece 4 Filter for gas removal 5 Filter unit

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B01J 20/30 B01J 20/30

Claims (6)

[Claims] 1. A gas removing filter comprising a plurality of filter pieces formed by adhering an adsorbent to a filter base material with an adhesive so as to flow a target gas between the filter pieces. A gas removing filter, wherein the adhesive comprises a water-soluble resin. 2. The gas removal filter according to claim 1, wherein the filter substrate is a thin plate made of aluminum or polyester. 3. The gas removal filter according to claim 1, wherein the adsorbent is activated carbon or an ion exchange resin, and the adhesive is a polyvinyl alcohol-based adhesive. 4. A filter unit, wherein the gas removal filter according to claim 1 is detachably attached to a filter housing. 5. A method for recovering a filter substrate, comprising: removing a gas removing filter from the filter unit according to claim 4; and immersing the gas removing filter in water or hot water. 6. The method according to claim 5, wherein the step of immersing the gas removal filter in water or hot water further includes a step of treating the filter with an ultrasonic cleaner.