JPH0716465A - Deodorizing member - Google Patents

Abstract

PURPOSE:To provide a deodorizing member capable of efficiently reducing the concn. of gaseous malodorous components to be removed, capable of preventing secondary emission of a malodor and excellent in the rate of deodorization and durability. CONSTITUTION:This deodorizing member contains 10-70wt.% manganese dioxide, 25-85wt.% activated carbon and/or activated carbon fibers and 3-20wt.% one or more kinds of oxides selected from among oxides of Cu, Fe, Ni, Co, V, Pt and Au. It is obtd. by firing in the temp. range of 200-350 deg.C in the final working process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing member that deodorizes by decomposing or modifying a malodorous component gas that causes a malodor, and in particular, a highly active catalyst substance and activated carbon or activated carbon fiber are essential constituent elements. As a result, the present invention relates to a deodorizing member that exhibits excellent deodorizing performance without generating a secondary malodor from the deodorizing member.

[0002]

2. Description of the Related Art Conventional deodorizing members of this type carry various substances having a catalytic action such as activated carbon, metal oxides or noble metals on the surface of various carriers, or knead these substances with various binders, It is manufactured by molding and then drying. The conventional deodorizing member thus configured exerts a desired effect in reducing the concentration of the malodorous component gas to be deodorized.

[0003]

However, these conventional deodorizing members are arranged so that the deodorizing member is placed in the malodorous component gas and another gas is deodorized during the deodorizing action by adsorbing or decomposing the malodorous gas component. There is a drawback that components are generated secondarily. Then, this secondary gas component causes a new malodor, or secondary malodor gas and a trace amount of malodor component originally contained in the atmosphere accumulate in the deodorizing member, As a result, the organic substances contained in the deodorizing member may be deteriorated, and as a result, the conventional deodorizing member cannot sufficiently exert the deodorizing effect, resulting in poor durability.

The present invention has been made in view of such problems, and it is possible to reduce the concentration of the malodorous component gas to be deodorized with high efficiency and prevent the generation of secondary malodors. It is an object of the present invention to provide a deodorizing member that can be manufactured and has excellent malodor removal rate and excellent durability.

[0005]

The deodorizing member according to the present invention contains 10 to 70% by weight of manganese dioxide and 25 to 85% by weight of activated carbon and / or activated carbon fiber as main components, and as a minor addition component, 3 to 2 of at least one oxide selected from the group consisting of oxides of copper, iron, nickel, cobalt, vanadium, platinum and gold.
It is characterized by containing 0% by weight.

Further, this deodorizing member has two steps in the final processing step.
It is preferably baked in a temperature range of 00 to 350 ° C.

[0007]

In the present invention, the malodorous component gas is decomposed and reformed at a high reaction rate by using a highly active catalytic substance called manganese dioxide. On the other hand, the gas component that is secondarily generated and becomes a malodor source is captured by activated carbon or activated carbon fiber. Since the gas component generated as a by-product has a slow deodorization rate, it is trapped on activated carbon or activated carbon fiber to provide sufficient contact time with the highly active catalyst substance. As a result, the offensive odor component gas generated as a result is converted into an odorless substance, and an excellent deodorizing effect is obtained.

Furthermore, in the final step of the manufacturing process of the deodorizing member,
By performing the calcination process in the temperature range of 200 ° C. to 350 ° C., the catalyst substance is highly activated, the organic substances in the deodorizing member are removed, and the entire deodorizing member is made inorganic. As a result, the deodorizing efficiency was improved and the deterioration of the deodorizing member and the accumulation of a trace amount of malodorous substances in the atmosphere were suppressed. Firing temperature is 35
If the temperature exceeds 0 ° C, some oxides will deteriorate and the performance tends to deteriorate.

In the decomposition and deodorization of a bad odor by utilizing a catalyst, under the condition that the treatment capacity of the catalyst is exceeded,
The catalytic reaction rate cannot catch up, and untreated malodorous components are inevitably discharged from the deodorizing member, and the deodorizing effect does not improve. Further, if the gas component to be deodorized is converted into another malodorous component gas by the catalyst component and it takes a long time to deodorize the newly generated gas component, the deodorizing effect is not enhanced.

However, according to the deodorizing member of the present invention, with respect to the offensive odor component produced by the secondary treatment which exceeds the processing capacity over time, the offensive odor component produced by the secondary reaction is captured by activated carbon or activated carbon fiber having an excellent physical adsorption ability. Does not occur. The malodorous component adsorbed on the activated carbon or the activated carbon fiber can be adsorbed and retained on the activated carbon or the activated carbon fiber until it is decomposed by the catalytic reaction. This makes it possible to prevent the deodorizing effect from decreasing even if the catalytic reaction rate cannot catch up.

The organic substances contained in the deodorizing member are decomposed and deteriorated by water, oxygen, microorganisms and the like in the atmosphere after being used for a long time, and become an odor source itself. In addition, organic substances containing water are more likely to adsorb a trace amount of malodorous substances in the atmosphere, and the deodorizing member becomes more likely to become a source of malodorous substances. Therefore, by firing in the temperature range of 200 ° C. to 350 ° C. in the final step of the manufacturing process of the deodorizing member, the organic substances in the deodorizing member are carbonized and the entire deodorizing member is made inorganic. Furthermore, by setting the calcination temperature to 200 ° C. to 350 ° C., high activation of the catalyst substance can be realized without causing functional deterioration of the activated carbon or activated carbon fiber. A firing time of 2 hours or more and 8 hours or less is suitable. If the firing time is less than 2 hours, the organic substances are not sufficiently carbonized and the deodorizing member cannot be made inorganic. Further, if the firing time is 8 hours, it is possible to sufficiently complete the mineralization, and firing for more than 8 hours causes an increase in processing cost and is not practical.

Further, in the present invention, at least one oxide selected from the group consisting of copper, iron, nickel, cobalt, vanadium, platinum and gold oxides is used.
To 20% by weight. By making each of these oxides coexist with manganese dioxide, the processing ability as a deodorizing member is improved. However, since the content of these oxides exceeds 10% by weight, the effect of addition becomes small, and even if the content of these oxides exceeds 20% by weight, no improvement in treatment capacity is observed. Therefore, the total amount of these oxides added is 3 to 20% by weight, preferably 3 to 10% by weight.

Manganese dioxide must be contained in an amount of 10 to 70% by weight, preferably 15 to 40% by weight, in order to function as a highly active catalyst substance.

The activated carbon and the activated carbon fiber may be contained individually or simultaneously. The content of the activated carbon and the activated carbon fiber is 25 to 85% by weight in order to obtain a sufficient adsorption action, and the preferable range is 40.
To 85% by weight.

By setting the ratio R ₁ of the content of activated carbon and / or activated carbon fiber to the content of manganese dioxide to 1.2 to 4.5, both effects can be exhibited more effectively. it can.

Further, the ratio R ₂ of the content of manganese dioxide and the content of at least one oxide selected from the group consisting of oxides of copper, nickel, cobalt, vanadium, platinum and gold is set to R ₂ . By setting 2.0 to 6.0, the processing capacity can be further improved.

The deodorizing member may be molded by extrusion, and the extrusion can be formed into various shapes such as a honeycomb molded body, a pellet-shaped molded body, a paper-shaped molded body or a corrugated molded body. it can. Further, it is also effective to fill the inside of the reaction vessel as a mixed powder without particularly molding.

On the other hand, various organic or inorganic binders required for molding, organic fibers such as pulp that efficiently retains activated carbon and metal oxides, inorganic fibers such as glass, and cordierite or sepiolite. It is desirable to minimize the amount of the mineral-based materials such as, for improving the deodorizing performance per unit volume, and the content is 3 to 55% by weight of the total content of the essential constituents defined in the claims. preferable. If the added amount of the binder exceeds 55% by weight, the minimum required amount of the deodorizing member to be added increases with respect to the amount of the malodorous gas to be treated, which is disadvantageous in handling.

[0019]

EXAMPLES Examples in which the present invention is applied to deodorization of methyl mercaptan will be described below. As an example of a method for processing the deodorizing member of the example of the present invention, a honeycomb-molded deodorizing member was subjected to a deodorizing test. This deodorizing member contains 22% of manganese dioxide and 55% of activated carbon based on the total weight of the deodorizing member.
%, Copper oxide 8% in terms of CuO, cellulosic organic binder 3%, clay mineral inorganic binder 17%. These components are kneaded, extruded into honeycomb, and dried at 300 ° C. Was fired for 3 hours (Sample 1). As a comparative example, 80% of activated carbon and 80% of activated carbon and cellulose were mixed with 80% of manganese dioxide, 3% of a cellulose-based organic binder and 17% of a clay mineral-based inorganic binder with respect to the total weight of the deodorizing member. A mixture containing 3% of a system organic binder and 17% of a clay mineral inorganic binder (Sample 3) was molded by the same method, and then fired. The performance of these samples 1 to 3 was evaluated.

This performance test method was performed as shown in FIG. That is, the deodorizing members of Samples 1 to 3 were attached to the measuring jig 2. Then, a malodorous gas (methyl mercaptan) is caused to flow into the measuring jig 2 at room temperature and normal humidity, and the gas is sampled at a point A on the inlet side and a point B on the outlet side of the measuring jig 2 every predetermined time. The concentration of the collected gas was analyzed by a gas chromatography method, and the adsorption capacity of the deodorizing member was determined from the difference in concentration between points A and B. However, the entrance concentration is 5pp
m, the gas flow rate is 1 liter / min. The measured value of the malodorous substance adsorption capacity is the removal rate after 20 minutes have elapsed.

FIG. 1 is a graph showing the test results of the deodorizing performance of these methyl mercaptans of Samples 1 to 3. 2 is a graph showing the concentration of dimethyldisulfide detected on the outlet side. As is clear from FIG. 1, the methyl mercaptan removal rate of sample 1 according to the example of the present invention and sample 2 of the comparative example is 100%, whereas sample 3 of the comparative example,
The removal rate is decreasing. Further, as shown in FIG. 2, in the sample 3 of the comparative example, dimethyldisulfide produced in the deodorizing process of the deodorizing member is present in an amount of 1 to 2 ppm, whereas the sample 1 according to the example of the present invention and the comparative example. Two
In this case, the concentration of dimethyl disulfide is 0 ppm. As described above, in Sample 1 according to the example of the present invention, the removal rate of the malodorous component is high, and the malodorous gas that is generated secondarily does not exist. It turns out that is high.

A deodorizing member manufactured by another processing method can obtain the same effect as that of the above-mentioned embodiment, and the deodorizing member of the embodiment of the present invention can produce various malodorous component gases and mixed malodors other than methyl mercaptan. It also has an excellent deodorizing effect on component gases.

[Brief description of drawings]

FIG. 1 is a graph showing the change over time in the removal rate of methyl mercaptan.

FIG. 2 is a diagram showing a time-dependent change in the concentration of dimethyldisulfide generated as a by-product.

FIG. 3 is a schematic diagram showing a deodorizing performance test method.

[Explanation of symbols]

 2; Measuring jig A; Inlet B; Outlet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01D 53/81 53/86 ZAB B01J 23/34 ZAB A 8017-4G 23/64 ZAB 8017-4G 23 / 656 23/84 ZAB 8017-4G B01D 53/36 ZAB H 8017-4G B01J 23/64 104 A

Claims (2)

[Claims] 1. Manganese dioxide in an amount of 10 to 70% by weight,
25 to 85% by weight of activated carbon and / or activated carbon fiber,
A deodorizing member containing 3 to 20% by weight of at least one oxide selected from the group consisting of oxides of copper, iron, nickel, cobalt, vanadium, platinum and gold. 2. The final processing step is performed by firing in a temperature range of 200 to 350 ° C.
The deodorizing member described in.