JPS60108048A - Air purifying agent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air purifying agent, and more specifically, the present invention relates to an air purifying agent made from a honeycomb molded body containing potassium permanganate with low ventilation resistance and used for efficiently removing air pollutants 11 or malodorous substances. The invention relates to an air purifying agent.

Conventionally, in factories, offices, homes, etc., various methods have been used to prevent and purify the air by removing air pollutants or malodorous substances contained in the air as part of creating a comfortable environment. It is being done.

A specific example is a method in which a molded body is impregnated with an oxidizing agent, potassium permanganate (hereinafter referred to as [xMnOJ), as an air purifying agent, and the air is purified by its oxidizing action. This method uses KM as an air purifying agent.
nO4 impregnated (spherical) +21 KMnO4 mixed with an inorganic adsorptive substance such as zeolite and molded into a cylinder shape with a diameter of 1 to 7 m (udon shape) (3) Inorganic carrier of appropriate size KM for crushed pieces
Impregnated with nO4 (fractured ring)
, +21, +31, the molded body is coated with stainless steel, iron ore metal or plastic mesh,
Fill filters made of polyester, non-woven fabrics, etc. with HH4.
1. Although I am using it, the pressure is low due to high air ventilation resistance.
If the loss is <4, it is impossible to fill a sufficient amount of medicine with air purification using a small fan, and the molded product is easily powdered and has the disadvantage of lacking strength. .

A honeycomb molded body made of activated carbon is known as a method that utilizes the adsorption effect of activated carbon, etc., but this honeycomb molded body is completely unable to remove ethylene, formalin, etc., which are No. 1 among air pollutants or malodorous substances. ,NH3,H2
It has a low adsorption capacity for S, SO2, etc., and there is a saturation phenomenon of adsorption to activated carbon and a desorption phenomenon.Also, it has a disadvantage that it has a small average absorption capacity for gases with extremely dilute concentrations.

In addition, honeycomb molded bodies made of activated alumina and zeolite are used in some cases, but their ability to remove air pollutants or malodorous substances is limited to certain substances such as water, and sufficient air purification effects cannot be obtained. There are drawbacks.

As a result of research conducted in view of the prior art as described above, the present inventors have found that by using a honeycomb molded body containing MnO4, which is an oxidizing agent, as an air purifying agent, pressure can be reduced in air purification and deodorization processing. The present invention was completed based on the finding that the loss is small, that it is possible to remove reducing scum that cannot be removed with conventional honeycomb molded bodies made of activated carbon, and that air purification can be carried out efficiently.

That is, the present invention is an air purifying agent characterized by comprising a honeycomb molded body containing KMnO4 (potassium permanganate) as an active ingredient.

The KMnO4 used in the present invention can be produced by a conventional method, and is preferably of high purity, but may contain some impurities.

In the present invention, the honeycomb molded body containing KMnO4, which is an active ingredient, has a cross-sectional shape of hexagon, pentagon, quadrangle,
A polygonal, circular, or cavernous honeycomb body such as a triangle is used, and there are no particular limitations on the size and shape.
Any material can be used depending on the purpose, and any material obtained by a conventional method can be used as the manufacturing method.

Furthermore, the base material of the honeycomb molded body is (ll K,
(2) It is an inert material that does not react with Mn ('14); (2) It has a relatively large specific surface area and pore volume; (3)
(4) Porous inorganic adsorptive material is used, which has the ability to retain moisture. are metal oxides such as activated alumina, iron oxide, magnesium oxide, and calcium oxide, or their aqueous hydrates, such as gold oxides, metal silicates such as magnesium silicate, calcium silicate, and zeolites. crystal'
tb aluminosilicate, amorphous aluminosilicate (aluminosilicate is generally sodium aluminosilicate, but sodium may be substituted with other metals), selected from fine powder silicic acid, silica alumina, etc. One or more of the following types are used.

The content of KMnO4 in the air purifying agent according to the present invention varies depending on the constituent materials of the honeycomb molded body, but it is preferably 1 to 15 parts by weight, more preferably 2 to 7 parts by weight per 100 parts by weight of the honeycomb molded body. If it is less than 1 part by weight, the lifetime of the removal performance will be shortened, and if it exceeds 15 parts by weight, the pores of the honeycomb molded body will be clogged and the removal efficiency will tend to decrease, which is not preferable.

The air purifying agent according to the present invention can be easily obtained by immersing a honeycomb molded body made of a porous inorganic adsorptive material such as activated alumina or zeolite in a MnO4 solution at a specific concentration for a certain period of time, and then drying it. I can do it. At this time, the concentration of the KMnO solution is preferably as high as possible in order to increase the efficiency of impregnating the honeycomb molded body with KMnO4, but an aqueous solution of 5 to 20% by weight is usually preferred.

After preparing the KMnO4-containing honeycomb molded body obtained in this way into a desired shape, it is packed into a column, etc., and air containing air pollutants or malodorous substances is passed through the column to easily purify the air. You can do 1 hit.

The KMnO4-containing honeycomb molded body, which is an air purifying agent according to the present invention, can remove reducing gases and a wide range of other air pollutants or malodorous substances through the oxidizing effect of KM1104 and the suction effect of the honeycomb molded body.・Specific examples of the substance are No, SO2, H2S.

Amines such as trimethylamine and triethylamine, alkyl sulfides such as methyl sulfide, mercaptans such as NH3 and methyl mercaptan, aldehydes such as formalin, phenols, unsaturated carbonized ice cream such as ethylene, sewage odor, animal odor, and nitrogen urine. Examples include malodors such as odors and mixtures thereof.

The air purifying agent according to the present invention can be used alone as described above, but as an example of another method of use, when used together with a honeycomb molded body made of activated carbon, it is possible to remove pollutants that are difficult to remove from both. It can be removed by interaction and shows excellent performance. For example, activated carbon can remove N02 from NOx, but it cannot remove NO, so KM
nO, No to No.

When oxidized to , both No and N02 can be removed satisfactorily by combining two types of honeycomb molded bodies as described above.

As a combined method, for example, a multilayer consisting of /A/B layers may be formed in the same column, or KMnO
A column filled with a t-containing honeycomb molded body and a column filled with an activated carbon honeycomb molded body may be provided separately, and both may be communicated with each other by a connecting means.

In this case, as a method of filling a column with honeycomb molded bodies, it is desirable to make the pores of the honeycomb molded bodies communicate with each other to reduce pressure loss during passage of the air to be purified.

Furthermore, when an activated carbon honeycomb molded body is impregnated with KMnO4, the KMnO4 is reduced by the activated carbon, so a honeycomb molded body subjected to such treatment is not desirable.

As explained above, the active carbon honeycomb molded body is mainly known as the artificial cam molded body used as a conventional air purifying agent, but the use of the honeycomb body made of the base material of the honeycomb molded body of the present invention is unprecedented. A honeycomb body containing KMnO4 is completely new and has excellent effects as shown below.

1) The pressure loss of a certain airflow for the same linear velocity is 1/10 compared to conventional cylindrical pellets because there is less ventilation and resistance.
It is as follows.

2) The strength of the honeycomb molded body according to the present invention is higher than that of conventional pellets, and it is difficult to powder.

3) In the case of conventional pellets, the layer thickness is limited to about 106 mm, but the honeycomb molded body according to the present invention can be prepared with a considerably thinner layer thickness, for example, 2 to 3 mm thick.

4) It can efficiently remove ethylene, NO, formalin, H2s, SO2, etc., which cannot be sufficiently removed by activated carbon honeycomb moldings.

5) Based on the above points, we recommend the use of small household deodorizers, filters for removing harmful gases and foul-smelling gases emitted from copying machines, air conditioners,
Can be used as air purifying filters for coolers, hot air fans, etc., and in car air purifiers.

In addition, if the air purifying agent according to the present invention deteriorates with use and loses its purifying ability, it can be treated with a honeycomb by immersion treatment in an oxalic acid aqueous solution or an aqueous solution of hydrogen peroxide and sulfuric acid, etc., followed by water bathing and drying. The molded body can be regenerated, impregnated with an aqueous potassium permanganate solution again, and reused repeatedly.

Next, Examples and Comparative Examples will be shown to further specifically explain the present invention.

Examples 1 to 4 and Comparative Examples 1 to 3 A honeycomb molded body made of activated alumina and 4A zeolite, with an opening of IB and 28, was cut with a diamond cutter to a thickness of 22eX 221WIX 91113. The samples were immersed in a KMnO4 aqueous solution having a concentration of 5 to 20% by volume at a temperature of 40 to 45°C for 15 minutes, then taken out and dried, and used for performance tests and pressure drop measurements in each example.

The above test piece is vertically 2.3 cm x horizontally 2.3 cm
×The inside of a column (tube) with length F30ath is packed, and the humidity is 60-70% containing about sp ppm H2S from the inlet.
Table 1 shows the H2S removal rate 30 minutes after the start when air at room temperature was passed through with an Sv value of 25,000.

On the other hand, as a comparative example, a blank of the above test piece which was not impregnated with KMnO4 was used.

Examples 5 to 6 and Comparative Example 2 Test pieces of the same shape as in Examples 1 to 4 were packed in a square column, and air at a humidity of 50 to 60% and room temperature containing about 5 pp of intestinal 802 was introduced from the inlet. The SO2 removal rate 30 minutes after the start when the Sv value was passed at 25,000 was as shown in Table 2.

- As a comparative example, a honeycomb molded body made of activated carbon was used.

Examples 7 to 8 and Comparative Examples 3 to 4 Test pieces of the same shape as in Examples 1 to 4 were packed in a square column, and a column containing about 5 pp fat of NH3 was introduced from the inlet at a humidity of 50 to 60% and room temperature. Table 3 shows the NH3 removal rate 30 minutes after the start when air was passed through at an SV value of 25,000.

On the other hand, in Comparative Example 4, zeolite, bentonite, KMnO
4 was mixed, kneaded, molded into 3II 1 mφ x approximately 10 mm J1, and dried into a cylindrical shape.

Examples 9 to 11 and Comparative Examples 5 to 6 Test pieces of the same shape as in Examples 1 to 4 were packed into a rectangular column, and approximately 0.1 Ipp intestinal NOx (NOQ
, 6pp+i, 8020.3PP■) containing air at a humidity of 60 to 70% and room temperature with an SV value of 25
Table 4 shows the removal rate of NOx (NO+N02) 30 minutes after the start when the temperature was 000.

That is, it can be seen that if a KMnO4-containing honeycomb molded body and an activated carbon honeycomb molded body are used in combination, a high NOx removal rate can be obtained due to the synergistic effect.

Example 12 A 2Iiffl KMnO4-containing activated alumina honeycomb molded body (containing 3.9 parts by weight of KMnO4) was packed into a square column, and the temperature was 70% and the temperature was 23°C containing about 2 ppm of methyl mercaptan (CH35H) from the inlet. The removal rate 20 minutes after the start when air was passed through with an SV value of 25,000 was 83.3%. Note that a detection tube was used for the measurement.

Example 13 A square column was packed with a 1+am KMnO4-containing activated alumina honeycomb molded body (containing 2.7 parts by weight of KMI+0), and about 2 pp+m of trimethylamine [
(c) 13) 3 N] at a humidity of 50% and a temperature of 2
When air of 1"C was passed through with an SV value of 25,000, the removal rate 10 minutes after the start was 68.7%.

Note that a detection tube was used for the measurement.

Example 14 A square column was packed with a 1 am-th KMnO4-containing activated alumina l\nicum molded product (containing 3.8 parts by weight of KMnO4), and approximately 5 ppm of triethylamine [(C
When air containing 2H, , ) 3N at a humidity of BO% and a temperature of 22° C. was passed through with an Sv value of 25,000, the removal rate 10 minutes after the start was 83.1%. Note that a detection tube was used for the measurement.

Example 15 A 2mm honeycomb molded body made of activated alumina was cut into 22mIaX 22mmX 50m with a diamond cutter.
Cut into m-thick pieces. This material was immersed for 15 minutes in a KMnO4 aqueous solution having a polarization of 8% by weight at 40 to 45 DEG C., taken out and dried, and the KMnO4 content was 4.3 parts by weight.

These test pieces were stacked in two stages in the axial direction of the hole, and the thickness was adjusted to 100 mm.
A column with a square cross section was filled with +wpeng, and the air velocity in the column was varied to measure the pressure loss on the inlet and outlet sides of the honeycomb portion. In addition, for comparison, the conventional cylindrical molded product used in Comparative Example 4 (3mmφ x 1hmJ
1) was packed in the same column to a layer thickness of 100 mm and measured. The results were as shown in FIG.

In Fig. 1, the solid line represents the honeycomb molded article according to the present invention, and the dotted line represents the air velocity (m/s) and pressure loss (mmaq) when air is passed through a column of a conventional cylindrical molded product.
It shows the relationship between

As is clear from this figure, the air purifying agent of the present invention has a much smaller pressure loss.

[Brief explanation of drawings]

FIG. 1 is a graph showing the pressure loss of air flow between a honeycomb molded body according to the present invention and a conventional cylindrical pellet. Applicant Nihon Kagaku Kogyo Co., Ltd. Agent Yutaka 1) Yoshio Figure 1 1 ( ) (Air velocity (771/s) Continued from page 1

Claims (3)

[Claims] (1) An air purifying agent characterized by being more than a honeycomb molded product containing potassium permanganate as a self-effective ingredient (2) The air purifying agent according to claim 1, wherein the content of potassium permanganate is 1 to 15 parts by weight per 100 parts by weight of the honeycomb molded body. (3) Claims characterized in that the base material of the honeycomb molded body is one or more selected from metal oxides, metal hydroacetates, metal silicates, and aluminosilicates. Air purifying agent according to paragraph 1 or 2