JPH0386209A - Laminated adsorbent and filter using the same - Google Patents

Abstract

PURPOSE:To reduce the pressure drop of the adsorbent regardless of its large contact area by laminating a member having plural protrusions and a flat member and forming one member with nonwoven fabric or paper and the other with a sheet of activated carbon fiber-contg. paper. CONSTITUTION:The first member 1 having plural protrusions 2 and the flat second member 3 are laminated to form a laminated adsorbent, and the member 3 is formed with nonwoven fabric or paper and the other with a sheet of activated carbon fiber contg. paper. As a result, the pressure drop is reduced regardless of its large contact area, and the adsorption efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is an air purifier or deodorizing device that uses activated carbon t.
The present invention relates to a laminated adsorbent that utilizes the adsorption performance of a-fibers and is suitably used for dust removal and deodorization, and a filter using the same.

<Prior art> As a laminated adsorbent as described above, conventionally, the
There was one shown in Publication No.-55971.

In this conventional example, a paper-like adsorption plate 01 containing activated carbon is used.
Then, a protrusion 02 is integrally formed by the bulge, a recessed surface 03 is formed on the back side of the protrusion 02, and the position of the protrusion 02 is overlapped between the suction plates 01 that are vertically adjacent to each other. The fluid to be treated is stacked so that the protrusions 02...
・It is configured to generate turbulent flow by colliding with the fluid and flowing into the recessed surface 03, increasing the contact area with the fluid to be treated and improving the adsorption efficiency (No. 11
(see figure).

<Problem to be solved by the invention> In the conventional laminated adsorption body described above, the upper and lower adsorption plates are 01.01
As shown in the cross-sectional view of FIG.
There was a drawback that the effects of 2... were reduced and the effects of the recessed surface 03 could not be expected to be sufficient.

In addition, when minute dust is mixed in the fluid to be treated, the dust easily enters the recessed surface 03..., and both the turbulent flow effect and the adsorption effect due to the recessed surface 03... However, there was a drawback that the amount decreased early and the desired effect could no longer be achieved.

The present invention has been made in view of these circumstances, and the product N adsorbent according to the present invention is capable of improving adsorption efficiency with a small pressure loss despite a large contact area. The purpose of this invention is to provide a filter that can further improve dust removal performance.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the laminated adsorbent according to the present invention includes a first member having a plurality of protrusions, and a flat second member. One of them is made of nonwoven fabric or paper, and the other is made of activated carbon fiber-containing paper having a paper-making structure, and the first member and the second member are stacked one on top of the other.

The above-mentioned activated carbon fiber-containing paper has a papermaking structure containing activated carbon fibers, and the activated carbon fibers include infusible pitch-based activated carbon fibers, activated carbon fibers obtained by activation treatment of carbon fibers, Various materials are used, such as fiber-attached activated carbon, which is powdered or granular activated carbon fixed to the surface of the fibers.

Examples of the carbon fibers include polymer fibers such as polyacrylonitrile resin, phenol resin, rayon resin, cellulose resin, lignin-poval mixture, petroleum pitch type, coal pitch type, and polyacrylonitrile (PAN) type. , various types of carbon fibers such as cellulose type are used.

The nominal specific surface area of activated carbon fiber is 700-2500 r
rf/g is preferable; if it is less than 700 rrr/g, the adsorption capacity will be small, while if it exceeds 2,500 rrr/g, it will be uneconomical.

Fiber-attached activated carbon using optically anisotropic porous microparticles activated with mesocarbon microbeads has a nominal specific surface area of about 800 to 4000 rrr/g and has excellent adsorption ability. .

When activated carbon fibers have a large number of pores and have low mechanical strength, activated carbon fiber-containing paper may be produced using the fibers and a binder.

Examples of fibers include pulp; natural fibers such as cotton and hemp; rayon fibers, acetate fibers, polyvinyl alcohol fibers, nylon fibers, aromatic polyamide fibers, acrylic fibers, polyester fibers, polyethylene fibers, polypropylene fibers, phenolic resin fibers, etc. Synthetic fibers; one or more types of inorganic fibers such as glass fibers, carbon fibers, and metal fibers are used. These fibers act as reinforcement.

Examples of binders include synthetic resins such as polyvinyl alcohol, cellulose resin, acrylic resin, polyester resin, urethane resin, polyamide, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyvinyl chloride, phenol resin, and epoxy resin. Resin can be used. The form of the binder may be liquid, powder, granule, etc., but it is preferably fibrous in order to prevent the pores of the activated carbon fibers from being blocked. , the various synthetic fibers mentioned above can be used. These synthetic fibers are appropriately selected depending on the heat resistance temperature required depending on the use of the laminated adsorbent.For example, if the heat resistance temperature required is about 80°C or less, polyethylene fibers etc. , polyester fiber or the like is used when a heat resistance higher than that is required.

The ratio of activated carbon fiber, fiber and binder is usually activated carbon fiber/fiber/binder = 60/10 to 5015.
~20 parts by weight, preferably 60/20~4015~1
The amount is about 5 parts by weight.

In addition, when the activated carbon fiber has high mechanical strength such as fiber-attached activated carbon, it is sufficient that it contains at least a binder, and the ratio of the activated carbon fiber to the binder is usually from -60 to 60 - activated carbon fiber/binder. 95fu 40~5
Parts by weight, preferably about 70-90/30-10 parts by weight.

The thickness of the activated carbon fiber-containing paper is usually 0.2 to 5 m.
s, preferably 0w, which is about 0.5 to 3-.

When the roughness is less than 0.2 wm, the mechanical strength decreases;
This is because if it exceeds III, it is not only uneconomical but also the adsorption space per unit volume becomes small.

The activated carbon mm-containing paper may contain additives such as a dispersant, a stabilizer, a viscosity modifier, and a filler within a range that does not affect the adsorption capacity.

The protrusion formed on the second member has an outer diameter of 1 to 20 m, preferably about 2 to 1 oan, and a height of 0.5 to 10 m, preferably about 1 to 5 m, at its protruding base end. formed into something. This is because if the outer diameter and height at the protruding base end are less than the above range, the pressure loss will increase, while if it exceeds the above range, the adsorption efficiency will decrease.

The pitch between adjacent protrusions is usually 2
~40++w, and the area of the protruding base end of the protrusion accounts for 40 to 60% of the unit area. 40
If it is less than 60%, the turbulence effect will be small and the adsorption efficiency will be reduced, while if it exceeds 60%, the pressure loss will be large.

The shapes of the protrusions include polygonal pyramidal shapes such as hemispherical, conical, triangular pyramidal, and quadrangular pyramidal shapes that become smaller toward the protruding end, and shapes such as cylindrical and polygonal columnar shapes. Further, the protruding end may be formed into a trapezoidal shape.

The protrusion may be solid, but it may be concave and bulge from one surface of the first member to the other surface because it is easy to manufacture and economical since it requires less material. It is preferable to have a curved shape.

Activated carbon fiber-containing paper having a papermaking structure can be obtained by, for example, preparing a dispersion containing activated carbon fibers, fibers, a binder, and optionally additives such as a dispersant, a stabilizer, a viscosity modifier, and a filler. It is obtained by wet paper making, followed by dehydration and drying. Various solvents can be used as the dispersion medium in the above dispersion, such as water, hydrocarbons, alcohols, esters, ethers, and ketones, but from the viewpoint of workability and economy, it is preferable to use water. The above-mentioned dispersion liquid can be adjusted to an appropriate concentration, but usually the solid content concentration is 0,
The content is adjusted to about 5 to 5% by weight, preferably about 1 to 3% by weight.

Non-woven fabrics include pitch-based and polyacrylonitrile (,
Carbon fiber nonwoven fabrics whose raw material fibers are various types of carbon fibers such as P A N )-based, cellulose-based, and phenol-based fibers and activated carbon fibers are preferably used. Moreover, Japanese paper or paper through which gas can easily circulate may be used instead of the nonwoven fabric.

The first filter using the laminated adsorbent according to the present invention is constructed by arranging the above-mentioned N@L adsorbent and the dust removal ventilation sheet in parallel in the flow direction of the fluid to be treated.

Further, the second filter using the laminated adsorbent according to the present invention is constructed by arranging the above-mentioned laminated adsorbent and the dust removal ventilation sheet in parallel in a direction perpendicular to the flow direction of the fluid to be treated.

As the dust removal ventilation sheet, a pleated nonwoven fabric, a honeycomb processed nonwoven fabric, or the like is used.

Effects> According to the configuration of the laminated adsorbent of the present invention, the protrusions are used as spacers, and the fluid to be treated collides with the protrusions to create a turbulent flow, so that the fluid to be treated is brought into good contact with the first and second members, The nonwoven fabric can remove dust, and the activated carbon fiber-containing paper can adsorb and remove odor components, harmful components, organic solvents, and the like.

According to the configuration of the first filter of the present invention, the fluid to be treated is passed through both the above-described laminated adsorbent and the dust removal ventilation sheet, and the fluid to be treated after dust removal by the dust removal ventilation sheet is Then, dust is further removed using a laminated adsorbent, and odor components, harmful components, and aqueous solvents are adsorbed and removed, or after dust is removed using a laminated adsorbent and odor components, harmful components, and aqueous solvents are adsorbed and removed. The dust removal sheet can further remove dust from the fluid to be treated.

Further, according to the configuration of the second filter of the present invention, the fluid to be treated that has passed through the laminated adsorbent is subjected to dust removal and adsorption removal of odor components, harmful components, organic solvents, etc.; By removing dust from the fluid to be treated that has passed through the ventilation sheet and passing it through the filter repeatedly, it is possible to remove dust from the fluid to be treated and adsorb and remove odor components, harmful components, organic solvents, etc. can.

<Example> Next, an example of the present invention will be described in detail based on the drawings.

Fig. 1 is a perspective view showing a sheet-like laminated adsorbent, and Fig. 2 is a sectional view showing Example 1 of the laminated adsorbent.

In these figures, 1 indicates a first member made of activated carbon fiber-containing paper of papermaking structure, and this first member 1
The protrusions 2 are formed at a predetermined pitch in the surface direction by recessing from one surface and protruding from the other surface.

Further, 3 is a flat second plate made of non-woven fabric or paper.
A first member 1 having the projections 2...
and the flat second member 3, and the upper and lower protrusions 2...
When viewed in the JIN direction, the stacked adsorbents A are constructed by overlapping each other alternately.

(A) of FIG. 3 is a cross-sectional view showing Example 2 of the laminated adsorbent, in which the positions of the upper and lower protrusions 2 are shifted from each other in the stacking direction. The first having...
The laminated adsorbent A is formed by stacking the members 1 and the flat second members 3 alternately.

2. Part (B) of FIG. 3 is a cross-sectional view showing Example 3 of the laminated adsorbent, in which the first members 1, 1 are in a state in which the proximal ends of the protrusions 2 are brought into contact with each other. The flat second member 3 is superimposed on each of the first members 1.1 having the protrusions 2... on the top side of the protrusions 2... A laminated adsorbent A is configured by combining them.

(C) of FIG. 3 is a cross-sectional view showing Example 4 of the laminated adsorbent, in which a flat plate-shaped second member 3 is sandwiched between protrusions 2...
The first members 1.1 having the projections 2... are superimposed with their top sides in contact with each other, and for each of the first members 1.1 having the projections 2... A laminated adsorption body A is constructed by stacking the flat second members 3 so as to be located on the proximal end side of the protrusions 2 . According to this fourth embodiment, the intermediate second member 3
By interposing the upper and lower protrusions 2, there is an advantage that a flow path through which the fluid to be treated passes can be reliably secured between the second member 3 and the first member 1, regardless of the position of the upper and lower protrusions 2. have.

(D) of FIG. 3 is a cross-sectional view showing Example 5 of the laminated adsorption body, in which solid protrusions 2 are formed on the first member 1, and the protrusions are The first member 1 having 2...
and a flat second member 3 are stacked on top of each other to form a laminated adsorbent A.

Figure 4 is a sectional view showing Example 6 of the laminated adsorbent;
A first member l having protrusions 2 and a flat second member 3 are overlapped to form a band-shaped sheet, and the band-shaped sheets are laminated by winding to form a laminated adsorbent. A is configured.

Figure 5 is a sectional view showing Example 7 of the laminated adsorbent;
A first member 1 having protrusions 2... and a flat second member 3 are overlapped to form a band-shaped sheet, and the band-shaped sheet is folded into a wavy or folded shape. The N-stack adsorbent A is constructed by stacking them. The protrusions 2... on the first member l are formed using an ordinary embossing machine or the like (an example of this is shown in Japanese Patent Application No. 1-17995 filed earlier by the present applicant). Furthermore, if the protrusions 2 are large, they may be formed by, for example, suction molding during paper making, instead of embossing using an embossing machine.

As exemplified above, there are various ways to superimpose the first member 1 and the second member 3, but in any of the ways, the first member 1 having the projections 2 is covered with a nonwoven fabric or paper. A sheet-like laminated adsorbent body A is manufactured by overlapping the plate-like second members 3 formed in the above. At this time, in order to improve the integrity and workability, the protrusion 2 of the first member 1...
It is preferable to suitably bond the top part or the flat part on the four-face side to the second member 3, because pressure loss due to fluid flowing into the recessed surface can be reliably prevented.

The obtained sheet-like laminated adsorbent A is preferably cut into a desired shape and size according to the intended use.
For example, when used as a filter for an air purifier or deodorizing device, it is preferable to cut the first and second members 1 and 3 into long pieces with a width of about 5 to 20 W. It may be laminated after cutting, but
For example, when producing a filter for a household air purifier with a small depth, the lamination work becomes complicated, and after laminating multiple sheets of laminated adsorbent A, it is difficult to make a filter of a predetermined size. Although it may be cut, in this case, since the laminated adsorbent A has cushioning properties and restoring properties, it becomes difficult to accurately cut it into a predetermined size.

Next, a description will be given of the results of a comparative experiment regarding pressure loss conducted using a specific example that further embodies a predetermined one of the aforementioned examples and a comparative example.

Pitch-based activated carbon fiber 60 with a nominal specific surface area of 700 g/m
Parts by weight, 30 parts by weight of hemp, 10 parts by weight of polyester fibers as a fibrous binder, 0.27 parts by weight of polyethylene oxide as a viscosity modifier, and 5000 parts by weight of water were mixed and stirred in a mixing tank, and paper was made by a wet paper making method. After that, dehydrate it and then dry it in a dryer to 600+w
Activated carbon fiber-containing paper of 1000 m x Lm was produced, and then a large number of concave and bulging protrusions with an outer diameter of 8 squares and a height of 2 squares were formed using an embossing machine.

The activated carbon fiber-containing paper is used as a first member, and a flat second member made of nonwoven fabric or paper is superimposed on this first member to produce a sheet-like laminated adsorbent.
Cut into strips of 70m x 10m, stack them,
Laminated adsorbent of Example 2 described above [see (A) in FIG. 3]
was created.

In addition, in the same way as in the above specific example 1, 600 x 1 x 100
A large number of concave and bulging protrusions with an outer diameter of 8 m and a height of 2.5 m+ were formed on activated carbon fiber-containing paper of O1.5 m.

The activated carbon fiber-containing paper is used as a first member, and a flat second member made of nonwoven fabric or paper is superimposed on this first member to produce a sheet-like laminated adsorbent.
It was cut into strips of 70 m x 10 am and laminated to produce the laminated adsorbent of Example 3 [see FIG. 3 (B)].

The activated carbon fiber-containing paper of Example 2 above is used as a first member, and a flat second member made of nonwoven fabric or paper is superimposed on this first member to form a sheet. A laminated adsorbent was produced, cut into strips of 3701111×10 11 I11, and laminated to produce the laminated adsorbent of Example 2 described above [see FIG. 3 (A)].

Comparative Twisted Soil The first members of the above specific example 1 were stacked on top of each other with the protrusions in the same direction to produce a laminated adsorbent.

Comparison Twisting The first members of Specific Example 1 above were twisted together by twisting of the first members of Example 3
[See Figure 3 (B)] to a flat plate-shaped second
A laminated adsorbent was produced by stacking the protrusions so that the four-faced sides of the protrusions faced each other so as to have a structure in which the members were removed.

The laminated adsorbents of the above-mentioned specific examples 1 to 3 and comparative examples I and 2 each had a length of 370 IIIl,
A sample filter for a warm air heater with a height of 180 mm and a width of 10 mm was fabricated as a test filter, and the pressure loss at a surface wind velocity of 1 m/sec was measured using a pressure loss measuring device, and the results shown in the table were obtained. .

(Hereinafter, blank space) As a result of the above, the filter using the laminated adsorbent of the specific example of the present invention can significantly reduce pressure loss and reduce the pressure loss per unit time compared to the filter using the laminated adsorbent of the comparative example. It was clear that the speed of the fluid being processed could be increased and the throughput could be improved.

In addition, when various fluids are passed through it, it has high adsorption performance against odor components such as ammonia, hydrogen sulfide, and methyl ethyl mercaptan, as well as organic solvents such as toluene.
It was clear that the ozone resolution was high. Furthermore, this laminated adsorbent was flame retardant.

Next, examples of various filters constructed using the laminated adsorbent according to the present invention will be described.

Figure 6 is a partially cutaway perspective view showing Example 1 of the filter, in which the layered adsorbent A of Example 1 described above is attached to the casing 4.
81 layers are housed in the interior to form a filter.

Figure 7 is a partially cutaway perspective view showing Example 2 of the filter, in which a dust removal filter is formed by pleating a nonwoven fabric at a position on the upstream side of the flow direction of the fluid to be treated in the casing 4. A ventilation sheet 5 is housed, and the dust removal ventilation sheet 5
The laminated adsorbents A of Example 1 described above are stacked and housed in multiple stages so as to be lined up on the downstream side in the flow direction of the fluid to be treated, thereby forming a filter. Example 2 of this filter corresponds to Example 1 of the first filter according to the present invention.

Figure 8 is a partially cutaway perspective view showing Example 3 of the filter, in which a dust removal filter is formed by processing a nonwoven fabric into a honeycomb at the upstream side of the casing 4 in the flow direction of the fluid to be treated. A ventilation sheet 6 is housed, and the dust removal ventilation sheet 6
The laminated adsorbents A of Example 1 described above are stacked and housed in multiple stages so as to be lined up on the downstream side in the flow direction of the fluid to be treated, thereby forming a filter. This third embodiment of the filter also corresponds to the first embodiment of the filter according to the present invention.

Figure 9 is a partially cutaway perspective view showing Example 4 of the filter, in which the lower half of the casing 4 in the direction orthogonal to the flow direction of the fluid to be treated is formed by pleating a nonwoven fabric. The dust removal ventilation sheet 7 that has been cleaned is housed, and the dust removal ventilation sheet 7 is lined up in the upper half of the dust removal ventilation sheet 7 in the direction perpendicular to the flow direction of the fluid to be treated. The Iim adsorbent is accommodated in 81 layers in an adsorbent stage to form a filter. Example 4 of this filter corresponds to the second example of the filter according to the present invention.

FIG. 10 is a partially cutaway perspective view showing Example 5 of the filter, in which the laminated adsorbent body Δ' of Example 6 described above is accommodated in the casing 4 to constitute the filter.

In the laminated adsorbent A of the above embodiment, the protrusions 2...
The first member 1 having the above structure is made of activated carbon fiber-containing paper, while the flat second member 3 is made of nonwoven fabric or paper. Protrusion 2...
The first member 1 may be made of non-woven fabric or paper, while the second plate-shaped member 3 may be made of paper containing activated carbon fibers.

The laminated adsorbent according to the present invention can be used as a deodorizing/dust removing filter for household and commercial air purifiers, an ozone removing filter, a deodorizing/dust removing filter for automobile air purifiers, and for hot air heaters and air conditioners. Deodorizing and dust removal filters, pre-filters for air conditioning in clean rooms, etc.
It can be applied to filters for various purposes.

<Effects of the Invention> As is clear from the above description, according to the laminated adsorbent of the present invention, a flow path is secured between the first member and the second member using the protrusions as spacers, and the fluid to be treated is collides with the protrusion and creates turbulent flow. Therefore, unlike the conventional example, there is no pressure loss or accumulation of dust due to the flow into the recess, and the fluid to be treated can be brought into good contact with the first and second members. In addition, the adsorption efficiency of the activated carbon fiber-containing paper can be improved, and odor components, harmful components, Im-containing solvents, etc. can be adsorbed and removed favorably. In addition, dust can be efficiently captured and dust removed by the activated carbon fiber-containing paper, the nonwoven fabric, or the paper, respectively.

Moreover, since the flat second member is interposed between the first members on which protrusions are formed, the protrusions do not enter into the recesses unlike the conventional example, and there is no need to consider the position of the protrusions. Can be stacked.

According to the first and second filters of the present invention, dust removal from the fluid to be treated is performed not only by the laminated adsorbent but also by the dust removal ventilation sheet, thus further improving the dust removal efficiency and reducing the amount of dust contained in the fluid. It can also be suitably used for fluids to be treated.

[Brief explanation of drawings]

The drawings show examples of a laminated adsorbent and a filter using the same according to the present invention, FIG. 1 is a perspective view of a sheet-like laminated adsorbent, and FIG. 2 shows Example 1 of the laminated adsorbent. FIG. 3(A) is a cross-sectional view showing Example 2 of the laminated adsorbent; FIG. 3(B) is a cross-sectional view showing Example 3 of the laminated adsorbent; FIG. (C) is Example 4 of the laminated adsorbent
FIG. 3(D) is a cross-sectional view showing Example 5 of the laminated adsorbent, FIG. 4 is a cross-sectional view showing Example 6 of the laminated adsorbent, and FIG. 6 is a partially cutaway perspective view showing Example 1 of the filter, FIG. 7 is a partially cutaway perspective view showing Example 2 of the filter, and FIG. 8 is a partially cutaway perspective view showing Example 2 of the filter. , FIG. 9 is a partially cutaway perspective view showing Example 3 of the filter, FIG. 9 is a partially cutaway perspective view showing Example 4 of the filter, and FIG. 1O is a partially cutaway perspective view showing Example 5 of the filter. FIG. 11 is a cross-sectional view illustrating problems in a conventional laminated adsorbent. 1... First member 2... Protrusion 3... Second member 5.6.7... Dust removal ventilation sheet

Claims (3)

[Claims] (1) One of the first member on which a plurality of protrusions are formed and the flat second member is formed of nonwoven fabric or paper, and the other is formed of activated carbon fiber-containing paper with a papermaking structure, A laminated adsorption body characterized in that the first member and the second member are stacked on top of each other. (2) A filter in which the laminated adsorbent according to claim (1) and a dust removal ventilation sheet are arranged side by side in the flow direction of the fluid to be treated. (3) A filter in which the laminated adsorbent according to claim (1) and a dust removal ventilation sheet are arranged side by side in a direction perpendicular to the flow direction of the fluid to be treated.