JPS63270547A - Ozone decomposer and ozone decomposing equipment - Google Patents

Abstract

PURPOSE:To effectively remove and reduce a high concn. ozone and to continue the treatment for a long period of time by adsorbing a terpenoid compound on a surface or in a pore part of a material having an ozone decomposing effect and preparing an ozone decomposer. CONSTITUTION:A terpenoid compound is adsorbed on a surface or in a pore part of a material having an ozone decomposing effect such as an activated carbon, metallic catalyst, inorganic compound having a granular, honeycomb, fibrous and other shapes to form the ozone decomposer. An ozone decomposing filter (a honeycomb-shaped active carbon filter) 4 is set up in an exhaust duct 3, a terpenoid containing container 5 is placed over the exhaust gas, and the terpenoid vapor is vaporized by means of a blowing power of a fan 6 to be built up on the ozone decomposing filter 4. Hence, the ozone is adsorbed and decomposed in the pore part of the activated carbon in the ozone decomposing filter 4, and the zone decomposing effect of the terpenoid compound can be maintained.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to an ozone decomposition material used in electrostatic copying machines, laser printers, air cleaners, etc.

The present invention also relates to an ozone decomposition device, and can also be used to remove leaked ozone in water and sewage treatment, film activation treatment, and the like.

(Prior art) Various inventions and ideas have been made for ozone decomposition materials and devices, but they do not only decompose ozone, but also require consideration of pressure loss, wind speed, humidity conditions, changes over time, etc. There are few proposals that are overall satisfactory.

Since electrophotographic imaging devices and air purifying devices equipped with corona discharge devices emit low concentrations of ozone, they are often equipped with ozone decomposition devices such as activated carbon, mainly in the form of filters.

In addition, a large corona discharge device for activating the film surface or sterilization using an ultraviolet light source.

Since decolorizing equipment and the like discharge highly concentrated ozone, large amounts of granular activated carbon, metal catalysts, inorganic compounds such as manganese dioxide, or mixtures thereof are used for this decomposition.

For low-concentration ozone decomposition of 1 ppm or less in electrophotographic imaging devices and the like, there is a demand for ozone decomposition filters that are low in deterioration over time, are inexpensive, and have low pressure loss, but there are few filters that fully satisfy this demand.

Further, although there is a demand for a smaller and more efficient ozone decomposition device for the above-mentioned film activation, sterilization, and other devices, it is difficult to find the desired device.

(Purpose) The present invention proposes materials and devices that solve these problems. Decomposition material (typically activated carbon.

By regularly adsorbing it on a metal catalyst, etc.),
It seeks to achieve its original purpose.

Note that the use of terpenoids as ozone removers is known from Japanese Patent Application Laid-Open No. 61-64315.

(Structure) The present invention applies to the surface or pores of a substance that has an ozone decomposition effect, regardless of its shape, such as granular, honeycomb, fibrous, or other shapes, and regardless of its material, such as activated carbon, metal catalysts, and inorganic compounds. The aim is to maintain the ozone decomposition effect by adsorbing terpenoid compounds to the ozone decomposition effect, and when the air to be treated passes through the substance having the ozone decomposition effect, the energy generated by the air movement is used. By configuring the device so that the terpenoids are volatilized into the air passing through the ozone-decomposed substances, the terpenoids are always kept adsorbed on the surface or pores of the ozone-decomposed substances, The purpose is to maintain the ozone decomposition effect of the ozone decomposition material for a long period of time.

As an example of the experimental results, as shown in the table below, an activated carbon filter that adsorbs about 6% (by weight) of terpenoids has significantly reduced ozone emissions compared to a used activated carbon filter.

When this is expressed in ozone concentration units (ρpm), the results are as shown in the following table.

This data shows that even used activated carbon filters that have deteriorated over time can sufficiently decompose ozone if terpenoids are adsorbed.

Activated carbon comes in granular, honeycomb, and fibrous shapes, and its raw materials are materials obtained by carbonizing plant-based materials such as wood, coconut shells, and pulp waste, or mineral-based materials such as coal, petroleum coke, and petroleum pitch. is used.

Regardless of the raw material or shape, activated carbon has countless micropores with a radius of around 100 pores, and these micropores adsorb odors and organic solvents, or adsorb and decompose ozone.

Unlike other substances, ozone is a strong oxidizing agent.

Due to ozone adsorption, the surface of activated carbon 1 or micropores 2
surface becomes oxidized, and as the oxidation progresses, the ozone decomposition effect decreases (see Figure 7).

In the case of other substances other than ozone, it is possible to remove the adsorbed substance by heat treatment after adsorption and reuse it, but in the case of ozone, the surface is oxidized or ashed, so it cannot be recycled.

On the other hand, the terpenoid compound used in the present invention has the general formula 〇mH2n++40p (m = 9-15, n = 0
~4, p = o~2) which is itself easily oxidized by ozone. For example, the typical d-1imon
For e, the following reaction can be considered as an example.

The above experimental results suggest that the terpenoids are adsorbed into the micropores, and the ozone that comes after is decomposed by the terpenoids before oxidizing the activated carbon surface.

Therefore, if terpenoids are constantly supplied to the surface of activated carbon, the ozone removal rate of activated carbon can be improved and deterioration can be prevented.

FIG. 1 shows an embodiment of the present invention, in which an ozone decomposition filter (honeycomb-shaped activated carbon filter) 4 is placed in an exhaust duct 3, and a terpenoid-containing container 5 is placed on the upstream side of the exhaust gas, and terpenoid vapor is vaporized by the aeration force of a fan 6. The ozone decomposition filter 4 is made to adhere to the ozone decomposition filter 4. In addition, FIG. 2 is a perspective view of the main part of FIG. 1, and FIG. 3 is an enlarged perspective view of 5 parts of the terpenoid-containing container, where 7 is a small divergence hole, and 8 is a guide plate for uniformly dispersing terpenoid vapor. , 9 is a gelling terpenoid.

Further, FIG. 4 shows another embodiment of the terpenoid-containing container designated by the reference numeral 10.

With the present invention, the ozone decomposition filter, whose removal rate dropped from 90% to 80% in 25 hours and the outlet concentration doubled, now works at least twice as effectively and has a removal rate of 90%.
It was found that it could be maintained at 5% or more (see Figure 6).

In the case of high concentration ozone (100 ppm or more) such as film treatment, water and sewage sterilization treatment, as shown in Figure 5, an ozone decomposition filter (either granular, honeycomb or fibrous activated carbon) 4 and terpenoids are used in the duct 3. By alternately arranging the containing containers 5, it is possible to create an ozone decomposition removal device that is cheaper and smaller than conventional devices. The action and effect are the same at low and high concentrations, but at high concentrations 1, for example, 5
00 ppm of ozone at once the legal rate of 0.00 ppm. Since it is not possible to reduce the amount below 1 ppm, the process is carried out in stages. The number of ozone decomposition filters and terpenoid-containing containers is determined based on the ozone concentration at the inlet and the ozone concentration required at the exhaust port, and the duct length and exhaust fan specifications are designed to keep the pressure drop below the upper limit. Here, the terpenoid-containing container is provided with one or more small holes 7 as required, as shown in FIGS. 3 and 4.

As a result of the experiment, when a certain wind speed passes through the surface of the opening (small hole) 7, the terpenoid inside evaporates from the opening. However, when there is no ventilation.

Only a very small amount evaporates.

The container material is preferably aluminum or flame-retardant plastic. Also, like electrophotographic imaging devices.

If the ozone decomposition filter, fan, and terpenoid container are in close proximity, the volatilized terpenoids will come into contact with the entire surface of the ozone decomposition filter.

It is preferable to provide a guide lower plate 8 as shown in FIG. 3 facing the center of the fan.

Example 1 Used active filter (manufactured by Toyobo Co., Ltd., honeycomb shape)
was left in a desiccator for 2 days, and terpenoids (d-1
imone) was adsorbed. The amount of adsorption was terpenoid weight/activated carbon weight=1/17 (g).

The filter was installed in a pipe with a ventilation rate of 1 ra/1 sec, and the amount and concentration of ozone at the outlet were measured.

The measuring device is MONITORLABS 0ZONE ANA
LYZER8410E (Also, the ozone concentration measured at 10 points at the same time was 0.0.
1~0. The reason for the change in lppm is thought to be that d-limonene adsorbed on the activated carbon surface was oxidized over time, reducing the ozone decomposition effect.

Example 2 In the apparatus shown in FIG. 1, a d-limonene adsorption activated carbon filter 4 (same product as in Example 1), a fan 6, and a terpenoid-containing container 5 were installed in the pipe (exhaust duct) 3.
The wind speed was adjusted to 1 m/sec, and the deterioration of the filter over time was measured.

Initial outlet concentration 0. O2 ppm did not change even after 5 hours, and d-limonene that volatilized with ventilation from the opening (2 m + mφ, 1 piece) 7 of the container was adsorbed to the filter.
It was found that this suppressed the deterioration of the filter. The terpenoid gel compound in the container is disclosed in Japanese Patent Application No. 61-2022.
It was adjusted according to Ozone Remover No. 68, and the amount of volatilization during ventilation in this case was 0.1 g/hour/20°C.

The container is filled with 100g of terpenoid gel compound, so when applied to an electrophotographic imaging device,
Assuming that it operates for an hour, the ozone decomposition effect will be maintained for a long period of time, 100g 10.5g (5 hours, day) = about 200 days.

The pressure loss experienced before the filter was 2 mm/H,O, but the pressure loss naturally remained unchanged.

Therefore, it was found that ozone can be effectively removed without increasing pressure loss.

Example 3 In the apparatus shown in Fig. 5, a duct of 100 mmφ was experimentally installed at the exhaust port for 500 pp+m of high-concentration ozone discharged from the exhaust port of the pretreatment device for printing or bonding polyester and polyethylene films. established in
We conducted an experiment to confirm the effect of terpenoid adsorption. The duct was 3 m long, and the duct was designed so that 10 activated carbon filters (manufactured by Tokyo Roki Co., Ltd., TAK Filter 800 Cell) and 10 terpenoid-containing containers could be installed.

The wind speed at the duct exhaust port is 0.5 m/sec, and the pressure loss before the activated carbon filter at the exhaust port is 4IIIIII/H2.
It was 0. The terpenoid-containing container is designated by reference numeral 1 in Figure 4.
It was made of aluminum with a size of 50 x 50 x 5 mm and was made flexible, as shown by 0, and was adhered to the bottom of the duct with double-sided tape.

Three small holes 7 with a diameter of 2+m+*φ were provided for the opening.

In the case of activated carbon filter only, as shown in Figure 6, 2
However, the 03 removal rate decreased to 45% in 5 hours.

When a terpenoid-containing container was installed as in the present invention, 95% was maintained. This is because d-limonene volatilizes from the openings of the 10 containers, and before the activated carbon filter surface is oxidized (ashed), d-limonene is oxidized and at the same time ozone is decomposed, resulting in a removal rate of 0. It is assumed that the value will not decrease.

(Effects) According to the present invention, a terpenoid compound is adsorbed to an existing ozone-decomposing material when necessary, thereby sustaining the ozone-decomposing effect of the ozone-decomposing material for a long period of time. Removal or reduction of ozone emitted from laser printers, air cleaners, etc., sterilization,
Decolorization and deodorization.

Removal of high concentration ozone leaking from industrial equipment (water and sewage treatment, etc.) for activating film surfaces.

It is possible to obtain ozone decomposition treatment agents and equipment that are effective for a long period of time and are inexpensive.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, FIG. 2 is a perspective view of the main part in FIG. 1, FIG. 3 is an enlarged perspective view of a terpenoid-containing container, and FIG. FIG. 5 is an explanatory diagram showing an example in which a plurality of filters and terpenoid-containing containers are provided, FIG. 6 is a graph showing the effects of the present invention, and FIG. 7 is the ozone decomposition effect of activated carbon. FIG. 2 is an explanatory diagram for explaining the reason for the decrease in 1... activated carbon, 2... micropores,
3...Exhaust duct, 4...Ozone decomposition filter, 5...Terpenoid containing container, 6...Fan, 7...Small hole, 8...Guide plate, 9 ...gelling terpenoid, 10...
container.

Claims (2)

[Claims] (1) An ozone-decomposing material made by adsorbing a terpenoid compound onto the surface or pores of a substance that has an ozone-decomposing effect. (2) A container containing a terpenoid compound is provided near a substance that has an ozone decomposition effect, and a blower or exhaust fan that transfers the air to be purified is used to remove the terpenoid component that volatilizes as the air is transferred from the container. 1. An ozone decomposition device characterized in that ozone is adsorbed by a substance while passing through the substance.