KR101600516B1 - A Composition of Carbon Block Filter for Cleaning Air and Carbon Block Filter Thereof - Google Patents
A Composition of Carbon Block Filter for Cleaning Air and Carbon Block Filter Thereof Download PDFInfo
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- KR101600516B1 KR101600516B1 KR1020150137412A KR20150137412A KR101600516B1 KR 101600516 B1 KR101600516 B1 KR 101600516B1 KR 1020150137412 A KR1020150137412 A KR 1020150137412A KR 20150137412 A KR20150137412 A KR 20150137412A KR 101600516 B1 KR101600516 B1 KR 101600516B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2055—Carbonaceous material
- B01D39/2058—Carbonaceous material the material being particulate
- B01D39/2062—Bonded, e.g. activated carbon blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/08—Special characteristics of binders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/12—Special parameters characterising the filtering material
- B01D2239/1241—Particle diameter
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Filtering Materials (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The present invention relates to a carbon block filter composition for air purification and a carbon block filter for air purification using the same, wherein the carbon block filter composition for air purification comprises 76 to 97% by weight of filtration particles having an average particle size of 5 to 1,900 μm; And 4 to 34% by weight of an ultra-high molecular weight polyethylene polymer having an average particle size of 5 to 600 μm, wherein the filtration particles are impregnated with phosphoric acid.
Description
The present invention relates to a carbon block filter composition for air purification comprising filtration particles and ultrahigh molecular weight polyethylene polymer, and a carbon block filter using the same.
The activated carbon filter used in the air purifier in the past mainly filled with granular activated carbon to filter and adsorb pollutants. However, when granular activated carbon is packed and used, the removal efficiency of contaminants is low due to the channeling phenomenon in the filtration layer, and the activated carbon fine particles continuously flow out, resulting in problems in use.
In addition, a general polyethylene (LDPE, HDPE) binder having a low viscosity and a high flow rate at a melting point or more has a problem of securing the pore and adsorption of the block by covering the surface of the activated carbon, The low molecular weight polyethylene having a good characteristic can be produced by an extrusion method, but the surface area of the activated carbon is blocked by the binder and the pore is difficult to control, so that a high performance filter can not be manufactured.
In order to solve these problems, a porous adsorption filter having a very high adsorbability can be obtained when ultrafine molecular weight polyethylene (UHMWPE) and powdered activated carbon having a controlled particle size are sintered at a predetermined ratio. Such a product is called a carbon block filter, and has replaced the conventional air filter in the past.
Particularly, it is known that the carbon block filter is produced by the compression mold method due to the characteristics of the binder, and the adsorption performance and pore development of the filter are very excellent. Generally, an excellent block filter manufacturing technique uses an extrusion mold method which has a high adsorptivity and can effectively control the porosity of a block.
However, the prior art for controlling the pore of the block filter has not produced a high-quality carbon block filter because the pore is formed by mixing the binder of the present invention to the activated carbon powder with artificially controlled particle size at a certain ratio and compression molding. Also, with such a production method, there is a problem that the activated carbon of the fine powder which is not effectively molded remains after the molding and leaks from the filter, resulting in deterioration of the merchantability.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a carbon block filter having excellent adsorption performance by using filtration particles and ultrahigh molecular weight polyethylene (UHMWPE) polymer.
In order to accomplish the above object, the present invention provides a filter composition for air cleaning, comprising 76 to 97% by weight of filtration particles having a particle size of 5 to 1,900 μm; And 4 to 34% by weight of an ultrahigh molecular weight polyethylene polymer having a particle size of 5 to 600 탆, wherein the filtration particles are impregnated with phosphoric acid.
Further, the carbon block filter of the present invention is characterized by being produced using the carbon block filter composition.
Since the carbon block filter composition according to the present invention is impregnated with phosphoric acid, when used as a carbon block filter, the harmful substances in the air are removed to enhance the deodorizing effect.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an illustration of a carbon block filter having a circular vent hole formed using the carbon block filter composition of the present invention. FIG.
2 is an exemplary view showing a mold for manufacturing the carbon block filter of the present invention.
3 is a graph showing the ammonia removal performance of the carbon block filter composition according to the present invention.
4 is a graph showing the specific surface area change of the carbon block filter composition according to the present invention.
5 is a graph showing the fracture curves of the carbon block filter composition according to the kind of the acid added to the carbon block filter composition of the present invention.
6 is a photograph showing a carbon block filter test body of the present invention.
7 is a photograph of a measuring instrument for measuring the compressive strength of the carbon block filter of the present invention.
8 is a photograph showing the carbon block filter test body of the present invention.
9 is a photograph of a measuring instrument for measuring the bending strength of the carbon block filter of the present invention.
Hereinafter, the present invention will be described in detail.
The present invention relates to a carbon block filter composition and a carbon block filter for an air cleaner having excellent adsorption performance using filtration particles and ultrahigh molecular weight polyethylene polymer.
The filtration particles in the present invention may mean activated carbon. The activated carbon is a carbonaceous adsorbent having a strong adsorptivity, and most of the constituent materials have a role of absorbing gas or moisture.
In the present invention, the activated carbon refers to activated carbon powder, which can remove harmful substances and odors in the air and remove volatile organic compounds and some heavy metals.
In addition, in the present invention, the ultrahigh molecular weight polyethylene polymer means an ultrahigh molecular weight polyethylene binder and functions as an adhesive for connecting powder activated carbon particles forming a filter into a block form, and can constitute a porous material having a large molecular weight.
In the present invention, impregnation is also referred to as impregnation, which means that other materials penetrate the surface of metal or ceramics, and are brought into close contact with each other.
The carbon block filter composition for air purification according to the present invention comprises 76 to 97% by weight of filtration particles having a particle size of 5 to 1,900 μm and 4 to 34% by weight of ultra high molecular weight polyethylene polymer having a particle size of 5 to 600 μm, Is characterized in that phosphoric acid is impregnated.
The activated carbon which does not impregnate phosphoric acid has a poor ability to remove ammonia, and the activated carbon which is impregnated with phosphoric acid has an increased ability to remove ammonia, which is a cause of odor.
In the present invention, a degassing additive selected from any one of nitric acid, hydrochloric acid, sulfuric acid, acetic acid, potassium carbonate, potassium hydroxide, 4-aminobenzenesulfonic acid, and ethylenediamine or a combination thereof may be added for removing harmful gases. For example, when potassium carbonate is added, an effect of removing acetic acid in the air can be obtained, and addition of 4-aminobenzenesulfonic acid can remove acetaldehyde in air.
In the present invention, the filtration particles may have an average particle size of 5 to 1,900 μm, preferably 200 to 600 μm, more preferably 250 to 590 μm. The average particle size of the ultra high molecular weight polyethylene polymer may be 5 to 600 μm, preferably 30 to 60 μm, more preferably 30 to 40 μm.
The average particle size of the filtration particles affects the specific surface area and porosity of the filter when formed by a carbon block filter. If the average particle size is too small, the specific surface area and porosity after molding are decreased, which is undesirable. It is preferable to use the filtration particles having an average particle size within the above range because the properties are deteriorated and the durability of the filter is decreased.
In addition, since the average particle size of the ultrahigh molecular weight polyethylene polymer affects not only the adhesion between the filtration particles but also the amount of the polymer located in the pores, if the average particle size is too small, the surface area of the filter is reduced and the porosity is lowered. If it is too large, the adhesion performance is insufficient and the filtration particles may leak out from the finished filter.
The ultra high molecular weight polyethylene polymer preferably has a weight average molecular weight of 3,500,000 to 9,200,000 g / mol. When the molecular weight is less than 3,500,000 g / mol, there is a problem that the pores are clogged by the polymer and the surface area is decreased. When the molecular weight is too large, the adhesive strength is decreased, so it is important to maintain the weight average molecular weight.
A catalyst may be added to the carbon block filter composition of the present invention. As the catalyst, a catalyst selected from any one of platinum, palladium, rhodium, osmium, and iridium or a combination thereof may be used. By using such a catalyst, decomposition of an organic material by heat or light is generated, and the performance of removing harmful substances in the air can be improved. However, if a precious metal catalyst is used, the unit price of the product is increased. Therefore, an appropriate amount is added depending on the use of the carbon block filter.
The carbon block filter of the present invention is fabricated using the carbon block filter composition. The carbon block filter is produced by molding the composition, wherein at least one vent hole is formed. The vent holes may be formed in a circular, hexagonal, quadrangular, or comb-like shape.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an illustration of a carbon block filter having a circular vent hole formed using the carbon block filter composition of the present invention. FIG. The carbon block filter can be produced by filling a carbon block filter composition into a mold as shown in Fig. 2 and compression-molding the same.
The pores of the carbon block filter may vary depending on the type of mold used. In addition, the size of the vent hole may be 9 to 30 mm, but it is not limited thereto and may be varied depending on the use of the filter.
In the present invention, the carbon block filter has a specific surface area of 600 to 1,300 m 3 / g. If the specific surface area is too low, sufficient harmful substances can not be removed and deodorization effect can not be obtained. If the molding pressure is lowered to increase the specific surface area, the durability of the molded article decreases.
In addition, the ultrahigh molecular weight polyethylene polymer used for the filtration particles constituting the carbon block filter has a ratio of particles having a particle size of 5 to 30 μm of 8 to 8.5: 1.5 to 2.
When the above conditions are satisfied, the formed carbon block filter has a compressive strength in the first direction of 2,200,000 to 11,000,000 N / m2, a compressive strength in the second direction of 340,000 to 3,400,000 N / m2, a bending strength in the first direction of 790 To 3,200 N / m < 2 > and a bending strength in the second direction of 4,700 to 17,000 N / m < 2 >.
Since the compressive strength is the maximum compressive stress that the material can withstand without breaking, and the bending strength is the maximum tensile stress that can withstand without being broken in the bending test, by satisfying the above range, the carbon block filter can have sufficient durability as a product do.
In addition, the first direction means a direction from an upper portion to a lower portion when the carbon block filter is placed in a planar state, and the second direction means an upper to lower direction when the carbon block filter is placed in a vertical state.
Such a carbon block filter can obtain the effect of decomposing or adsorbing harmful substances in the air from the pores existing in the activated carbon.
Hereinafter, embodiments of the present invention will be described in detail in order to facilitate understanding of the present invention. The following examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.
1. Mixing process
The average particle size of the activated carbon (KURARAY CHEMICAL, Co., Ltd.) was 200 to 650 μm.
An aqueous solution of phosphoric acid (H 3 PO 4 , GUANGXI MINGLI CHEMICALS, Co., Ltd) was filled in the impregnation tank made of SUS, immersed in activated carbon, and allowed to stand for 3 hours to primary impregnate phosphoric acid in pores of activated carbon. After drying for a certain period of time, secondary impregnation was carried out in the same manner to obtain activated carbon impregnated with 10 wt% or more of phosphoric acid based on the total weight of the impregnated activated carbon.
Next, a solution of activated carbon with phosphoric acid impregnated with calcium carbonate (K2CO3, Daemyung Chemical Co.), 4-aminobenzenesulfonic acid (BAO MING TRADING Co., Ltd), ultrahigh molecular weight polyethylene polymer having an average particle size of 5 to 600 mu m ENGINEERING) at a weight ratio of 6: 1: 1: 2. In addition, platinum was added and mixed as a catalyst for improving the reactivity.
At this time, any one of GUR 2122, GUR 4050-3, GUR 4120, GUR 4022 and GUR 4022-6 manufactured by Celanese may be used as the ultra high molecular weight polyethylene polymer. The properties of each ultra high molecular weight polyethylene are shown in Table 1.
2. Filter molding process
The composition is injected into a mold and compression molded to produce a filter. That is, the composition was quantified with a precision electronic scale, filled in an aluminum mold as shown in FIG. 2, and the guide ring was pressed downward at a pressure of 4 to 6.5 kgf / The filter is formed.
After the molding, the carbon block filter is heat-treated in a state in which the mold is not separated.
3. Heat treatment process
The heat treatment process is performed in an electric furnace capable of simultaneously heat-treating hundreds of filters at a temperature of 20 to 240 DEG C, preferably 130 to 200 DEG C for 10 to 60 minutes. After the mold is taken out to the outside, it is cooled by using cold air for about one hour.
When the cooling is completed, the outer mold and the inner core are separated from each other using a separate jig and drawn out to the outside, so that the carbon block filter as shown in FIG. 1 can be manufactured.
4. Characteristics of carbon block filter composition
In order to confirm the effect of deposition of phosphoric acid on the carbon block filter composition, the ammonia removal efficiency according to the amount of phosphoric acid deposition was measured.
As a result, as shown in FIG. 3, it was confirmed that the ammonia removal efficiency increased as the deposition amount of phosphoric acid increased or decreased.
The ammonia removal performance was confirmed by measuring the ammonia concentration of the outlet at the inlet concentration of ammonia gas of 10 ppm ± 1 using a detector tube, and the ammonia removal performance according to the impregnation amount is shown in Table 2.
From the results of Table 2, it was confirmed that the removal efficiency of ammonia gas was 90% or more when phosphoric acid was added at 20 wt% or more to the filtration particles. Furthermore, it was found that when the phosphoric acid was immersed in 10 wt% or more, the removal efficiency was such that the odor could be removed when used as a filter.
Next, the specific surface area of the composition after the deposition of phosphoric acid was measured, and the result is shown in FIG. The specific surface area was measured using TriStar II 3020 manufactured by MICROMETRICS.
As a result, even if phosphoric acid was immersed in 40 wt%, the specific surface area was not greatly decreased, and the effect of removing and deodorizing harmful substances in the carbon block filter composition of the present invention was confirmed.
Table 3 summarizes the results of analysis using T-Plot.
As shown in Table 3, even when phosphorus was added at a maximum of 40% by weight, the specific surface area was reduced by 22% as compared with activated carbon before impregnation. Thus, the surface loss was not large, and the total pore volume was reduced by 25% . As a result of actual experiments, it was found that there was no significant difference in the adsorption performance when the specific surface area was 700 m 2 / g or more. Thus, the present invention can be used as a filter without deterioration of adsorption performance even when phosphoric acid is added up to 40 wt%.
In addition, when ammonia was removed from other acids, it was found that even nitric acid, sulfuric acid, and hydrochloric acid, which are stronger than phosphoric acid, can remove ammonia, but the acidity is higher than that of phosphoric acid. . In particular, the performance graph of the impregnated material in FIG. 5 shows that the nitric acid and sulfuric acid show a large difference in the breakdown curves and are not more suitable than the phosphoric acid. Therefore, it was confirmed that it is most suitable to remove harmful substances in air by impregnating phosphoric acid in the present invention.
5. Physical properties of carbon block filter
Since the carbon block filter was produced by press molding, it was determined whether or not the surface area reduction by the molding occurred.
The surface area and the pore volume of the composition in which phosphoric acid is 40 wt% impregnated before and after the press-molding were measured, and the results are shown in Table 4 below. At this time, the sample after press molding is a result of measuring a powdered sample by crushing the molded carbon block filter.
The results show that the specific surface area is decreased by 7% and the pore volume is decreased by 16%, and it is confirmed that sufficient specific surface area and porosity are maintained even after the press molding.
Next, compressive strength and bending strength were measured in the first and second directions to measure the strength of the carbon block filter. Model 5928 of INSTRON was used as the compressive strength tester, and Model 5982 of INSTRON was used as the bending strength tester.
The compressive strength of the 30 × 30 mm carbon block filter shown in FIG. 6 was measured, and the carbon block filter was tensioned with a 5-ton compression plate as shown in FIG.
As a result, the compressive strength in the first direction was 5.068 kN and the compressive strength in the second direction was 0.180 kN. When the carbon block filter was subjected to tension by a 15-ton compression plate, the compressive strength in the first direction was 2.920 kN and the compressive strength in the second direction was 0.451 kN.
The bending strength was measured by using a carbon block filter having a size of 30 x 120 mm as shown in Fig. 8, and the carbon block filter was measured by applying a tension to the carbon block filter with a 5t compression plate as shown in Fig.
As a result, the bending strength in the second direction was 15 N. When the tensile force was applied with a 10-ton compression plate, the bending strength in the first direction was 8 N and the bending strength in the second direction was 30 N. Also, when the tension was applied by a compression plate of 15t, the bending strength in the first direction was 17 N and the bending strength in the second direction was 27 kN.
6. Deodorization efficiency of carbon block filter
The carbon block filter was mounted on an air purifier (Woongjin Coway, AP-1013F) and the deodorization efficiency of the air was measured. In addition, the deodorization efficiency of an ordinary air cleaner equipped with a general filter was measured.
The deodorizing efficiency was measured at the Coway R & D Center and the Osaka Gas R & D Center according to the Korea Air Purifier Association Inspection Standard (SPS-KACA002-132) and Japan Home Air Purifier Inspection Specification (JEM 1467).
The results of Table 5 show that the air purifier incorporating the carbon block filter of the present invention has higher deodorization efficiency than the conventional air purifier. Therefore, it was found that the carbon block filter made of the phosphoric acid-impregnated composition according to the present invention exhibits excellent deodorizing performance by removing harmful components in the air.
Claims (12)
From 4 to 34% by weight of an ultra high molecular weight polyethylene polymer having an average particle size of from 30 to 60 [mu] m,
The filtration particles are impregnated with 20 to 40% by weight of phosphoric acid based on the filtration particles,
Wherein the ultrahigh molecular weight polyethylene polymer has a weight average molecular weight of 3,500,000 to 9,200,000 g / mol. The carbon block filter for air purification manufactured using the carbon block filter for air cleaning,
Wherein the air-cleaning carbon block filter comprises:
The carbon block filter has a specific surface area of 600 to 1,300 m < 3 > / g,
When the carbon block filter is placed in a flat state, the compressive strength in the first direction which is the downward direction from the upper direction is 2,200,000 to 11,000,000 N / m 2, and when the carbon block filter is placed in the vertical state, A strength of 340,000 to 3,400,000 N / m < 2 &
Wherein the bending strength in the first direction is 790 to 3,200 N / m < 2 >, and the bending strength in the second direction is 4,700 to 17,000 N / m < 2 >.
Wherein the carbon block filter has at least one ventilation hole formed therein.
Wherein the vent hole is formed in a circular, hexagonal, quadrangular, or comb-like shape.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3318313A3 (en) * | 2016-11-08 | 2018-06-20 | Hamilton Sundstrand Corporation | Sorbent systems and methods |
| KR102356278B1 (en) * | 2021-10-15 | 2022-02-08 | (주) 한독크린텍 | Cylindrical carbon block filter and functional composite filter unit including the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10296087A (en) * | 1997-04-30 | 1998-11-10 | Daikin Ind Ltd | Deodorizing catalyst and its manufacture |
| KR20070028440A (en) | 2004-05-26 | 2007-03-12 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Gas porous polymer filter and methods of making it |
| JP2010046172A (en) * | 2008-08-20 | 2010-03-04 | Panasonic Corp | Deodorizing filter and its manufacturing method |
-
2015
- 2015-09-30 KR KR1020150137412A patent/KR101600516B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10296087A (en) * | 1997-04-30 | 1998-11-10 | Daikin Ind Ltd | Deodorizing catalyst and its manufacture |
| KR20070028440A (en) | 2004-05-26 | 2007-03-12 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Gas porous polymer filter and methods of making it |
| JP2010046172A (en) * | 2008-08-20 | 2010-03-04 | Panasonic Corp | Deodorizing filter and its manufacturing method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3318313A3 (en) * | 2016-11-08 | 2018-06-20 | Hamilton Sundstrand Corporation | Sorbent systems and methods |
| US10391469B2 (en) | 2016-11-08 | 2019-08-27 | Hamilton Sundstrand Corporation | Sorbent systems and methods |
| KR102356278B1 (en) * | 2021-10-15 | 2022-02-08 | (주) 한독크린텍 | Cylindrical carbon block filter and functional composite filter unit including the same |
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