JPS63274434A - Deodorizing method - Google Patents

Abstract

PURPOSE:To increase the deodorizing capacity of a composite malodor and a large quantity of a malodor, by combining both of an adsorbing material supporting an acidic deodorizing liquid extracted from a plant and an adsorbing material supporting a stabilized chlorine dioxide solution in a malodorous air flow passage. CONSTITUTION:An acidic deodorizing liquid extracted from a plant such as a deodorizing liquid extracted from a camellia put on the market under the name of 'Fureska', a resin org. acid extracted from a needle-leaf tree and a broadleaf tree or a fractionated wood vinegar liquid of a wood tar component generated as a byproduct at the time of dry distillation of wood is prepared. Separately, a stabilized chlorine dioxide solution having a concn. of 0.1-6wt.% and adjusted to pH 10-11 is prepared. The aforementioned acidic deodorizing liquid extracted from the plant and the stabilized chlorine dioxide solution are respectively supported by a carrier such as a ceramic molded body to obtain adsorbing materials. Two kinds of these adsorbing materials are combined to be arranged to a malodorous air flow passage to perform deodorizing.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a method for deodorizing airflow.

More specifically, it relates to a dry deodorizing method that can be used for commercial and domestic purposes by combining an adsorption carrier carrying a deodorizing liquid with deodorizing ability in a malodorous air stream6. Technology> Conventionally, many deodorizing methods are known, both wet and dry.

Of these, the most common dry deodorization method used to be to pass airflow through a packed layer of activated carbon, and in small-scale air conditioners, non-woven filters made of sand-inch granular activated carbon were used. ing. Recently, for example.

A method of passing an air stream through an adsorbent carrying a stabilized chlorine dioxide solution, which was previously proposed by the present inventor (Japanese Patent Laid-Open No. 57-153
No. 723) and methods in which an adsorbent in which a deodorizing liquid extracted from plants of the Camellia family is adsorbed are used in the air stream are well known. Although these deodorizing methods have varying degrees of deodorizing ability, they are useful to a certain extent and are currently in use, but there are still points to be improved. That is, first, in deodorizing methods using activated carbon, the deodorizing ability is generally large in the initial stage of use, but on the other hand, the selectivity of the adsorption capacity for each type of malodorous gas that makes up the complex malodor is limited. The overall deodorizing effect is not sufficient due to the
Also, there is the issue of the source of the reoccurring bad odor at the time of replacement.

Next, the method of passing an air flow through a zeolite layer and a stabilized chlorine dioxide liquid adsorbent layer, which was previously applied by the present inventor (Japanese Unexamined Patent Publication No. 5
7-153723), although it is a much improved method compared to the deodorizing method using the activated carbon layer described above, the air volume is large, such as in commercial air conditioners and sewage treatment plants. When applied to equipment with large fluctuations in odor concentration, it became clear that the high ventilation resistance of the zeolite layer would be a problem, and there was a desire to improve the deodorizing ability, especially for ammonia. Furthermore, dry deodorization methods that use plant extracts as deodorizers have problems in the selection of adsorption carriers, and have not yet been put to practical use.

In short, the current situation is that a dry deodorization method that can replace the use of activated carbon has not been put into practical use, especially in devices with large fluctuations in odor concentration and large air volume.

<Objective of the present invention> The present invention was made in view of the drawbacks of the dry deodorizing method of the prior art described above, and its purpose is to eliminate complex malodors,
Moreover, it is an object of the present invention to provide a dry deodorizing method that has excellent deodorizing ability, especially when applied to large air volumes.

<Means for solving the shortcomings of the prior art> The present inventors demonstrated that wood vinegar has an excellent deodorizing effect on bad odors such as sewage odor and human urine odor by applying it to an actual odor site. I've been doing it.

On the other hand, we have proposed a solidified product of a stabilized chlorine dioxide solution that is supported on an adsorption carrier and serves as a source of stable chlorine dioxide. (For example, JP-A No. 5
No. 7-57550 No. 57-59634 No. 57-
No. 168977, No. 59-193979, etc.) Furthermore, a dry deodorization method in which a stream of malodorous air is passed through the adsorbent of the stabilized chlorine dioxide solution and a zeolite layer (Japanese Patent Laid-Open No. 57-1
No. 53723) was proposed as mentioned above.

The present inventors have worked diligently on the research and development of a new dry deodorization method based on these long years of experience and track record with deodorization methods. An effective method is to combine an adsorbent carrying an odor liquid and an adsorbent carrying a stabilized chlorine dioxide solution and passing a malodorous gas flow through the adsorbent.

Furthermore, as an acidic deodorizing liquid extracted from plants, it was discovered that pyroligneous vinegar was particularly desirable to use, and the authors succeeded in overcoming the drawbacks of the prior art.

Structure of the present invention The deodorizing method of the present invention combines an adsorbent carrying an acidic deodorizing liquid extracted from plants and an adsorbent carrying a stabilized chlorine dioxide solution to create a flow path for malodorous air. In order to particularly improve the deodorizing effect, the deodorizing liquid and adsorption carrier to be used are specified.

To explain each component in detail below, first, the acidic deodorizing liquid extracted from plants used in the present invention includes, for example, a deodorant liquid extracted from a plant of the Camellia family commercially available under the name Fresca, a deodorant liquid extracted from a plant of the Camellia family, commercially available under the name Fresca, Examples include resin organic acids extracted from broad-leaved trees, and wood vinegar obtained by fractionating wood tar produced as a by-product during dry distillation of wood, but wood vinegar is preferably used from the standpoint of economy and deodorizing effect.

Next is the stabilized chlorine dioxide solution used in the present invention.

Unlike chlorine dioxide water, which is simply dissolving chlorine dioxide in water, chlorine dioxide gas is stably retained and dissolved in water using a peroxide such as soda percarbonate as a stabilizer, and one example of its manufacturing method is For example, it is disclosed in US Pat. No. 3,123,521. l! The commercially available stabilized chlorine dioxide solution has a concentration of 5 to 6% and a pH of 8.0.
~10.6, but for use in the present invention 0
．． A solution having a concentration of 1 to 6% (by weight) and a pH adjusted to 10 to 11 is preferably used.

In the present invention, the adsorption carrier used to support an acidic deodorizing liquid or a stabilized chlorine dioxide liquid to form an adsorbent has a liquid supporting capacity of at least 10% by weight or more, preferably 20% by weight or more.

Moreover, there are no particular restrictions as long as it can be maintained stably without changing over time, but generally speaking, the main ingredients are molded bodies such as activated alumina or calcium silicate spheres, and clay minerals such as diatomaceous earth. Examples include molded bodies with liquid absorption properties, so-called old ceramic molded bodies and new ceramic molded bodies with liquid absorption ability. Among these adsorption carriers, ceramic molded bodies or activated alumina molded bodies are preferably used because of their advantages in adsorption capacity, breaking strength during filling, and difficulty in regeneration.

When an adsorbent carrying a liquid is placed in a flow path of a malodorous gas flow, the supported liquid will naturally volatilize into the airflow, so it is necessary to limit the evaporation of the liquid from the adsorption carrier. In order to extend the service life of the adsorbate, it is possible to block a portion of the surface of the carrier by coating or other treatment. From the viewpoint of 1, the present invention uses a ceramic molded body partially glazed on the surface in order to extend the service life of the adsorbent, especially when deodorizing a large air flow with a low concentration of bad odor. This point is a feature of the method of the present invention, which is a significant improvement over the prior art. This partially glazed ceramic molded body releases the deodorizing liquid carried only from the unglazed part exposed on the surface, so it can be deodorized by setting the area appropriately. It has the advantage of being able to adjust the volatilization rate of the liquid.
The adsorption carrier can be designed in accordance with the air volume and concentration of the malodorous air flow, and as a result, the service life of the adsorbent can be extended. In order to economically produce ceramic molded bodies on an industrial scale, for example, a liquid-absorbent ceramic molded body formed into a rod shape and coated with glaze is cut into rounds, and the unglazed portion is sprayed onto the cut surfaces. This can be achieved by

Next, in order to obtain an adsorbent on which the deodorizing liquid used in the present invention is supported, an acidic deodorizing liquid or a stabilized chlorine dioxide solution is sprayed onto the above-mentioned adsorption carrier, or the adsorption carrier is injected into these liquids. It can be obtained by soaking and adsorbing the material and then air-drying it until the surface becomes dry.

The method of the present invention can be carried out by placing the above-mentioned adsorbent carrying the deodorizing liquid in a suitable container and placing it in a flow of malodorous air.

For example, two types of adsorbate may be packed into separate packed columns and the malodorous stream may be passed through the column, or one
Place the adsorbent in a breathable container, such as a porous container, and
For example, it may be installed in an air flow path. At this time, the order in which the airflow passes through the adsorbent layer of the acidic deodorizing liquid and the adsorbent layer of the stabilized chlorine dioxide solution is not particularly important, but it is preferable.

Since the main components of normal bad odors are basic chemicals such as ammonia and amines, it is preferable to provide the adsorbent layer of acidic deodorizing liquid first, followed by the adsorbent layer of stabilized chlorine dioxide liquid. .

In addition, when the malodor concentration is relatively low, such as when applying the method of the present invention after the malodorous air stream has been treated with a wet method in the previous stage, an adsorbent layer of acidic deodorizing liquid or an adsorbent layer of stabilized chlorine dioxide liquid may be used. A sufficient deodorizing effect can be achieved even if the material layer is omitted or this layer is replaced by a layer filled with only an adsorption carrier. Furthermore, in devices such as air cleaners whose installation location and volume are relatively restricted, the two types of adsorbent layers described above may be installed in parallel with the airflow.

Since the adsorbent layer of the acidic deodorizing liquid and the adsorbent layer of the stabilized chlorine dioxide liquid used in the present invention gradually release the adsorbed deodorizing liquid under the flow of foul-smelling air, there is some appearance when the effect disappears. If the above change occurs, it will be convenient to know when to replace it, but in order to achieve this purpose, the volatile composition with discoloration ability (patent application No. 60-100874), or may be used as an indicator by mixing it with the adsorbent layer.

Next, to describe the mechanism of deodorization in the method of the present invention, first, basic compounds such as ammonia and amines are deodorized from the malodorous air stream by wood vinegar generated from the acidic deodorizing liquid adsorbed material.

Subsequently, chlorine dioxide gas generated from the stabilized chlorine dioxide source adsorbate chemically decomposes and deodorizes mainly amines and sulfides such as hydrogen sulfide and mercaptans.

<Effects of the Invention> As a dry deodorizing method, the method of the present invention greatly improves the deodorizing effect of the conventional method using activated carbon, improves the efficiency of replacement and regeneration work, and extends the sustainability of deodorizing performance. This is an improved version with great effects. Therefore, its application fields are wide, such as sewage treatment plants, air conditioners, air purifiers, and other deodorizing and purification of malodorous air streams.

Moreover, the ability to achieve a sterilizing effect using chlorine dioxide gas is a great effect not seen in conventional dry deodorization methods.

Examples are shown below, and the number of parts and percentages are shown in parts by weight and percentages by weight, respectively.
(2) A rod-shaped ceramic molded body having a diameter of 6 mm/m is cut to a length of about 6 mm/m to expose the unglazed surface. This adsorption carrier was immersed in a commercially available wood vinegar solution (manufactured by Seiko Sangyo Co., Ltd., trade name: Neoshuless) to obtain a wood vinegar adsorbent.

On the other hand, 165 parts for 100 parts of porous ceramic beads (Sumitomo Chemical Co., Ltd.! 1) about 3 to 4 +w/+a grains.
% and a pH of 10.4 (manufactured by Osaka Soda Co., Ltd.) is adsorbed and air-dried to obtain a stabilized chlorine dioxide source adsorbate.

A commercially available air purifier (manufactured by 8 Shin Kagaku Kenkyusho, product name: Panvert M), which is equipped with airflow suction holes and exhaust holes, and incorporates a sirocco-type suction fan (100V, 16W) in the middle of the flow path.
Prepare. A cylindrical deodorizing cartridge (cross section 50
m/Ilφ, length 40+s/m), 70 parts of the above-mentioned wood vinegar solution adsorbent was placed on the suction hole side, and 50 parts of the stabilized chlorine dioxide liquid adsorbent was placed on the discharge hole side, partitioned in the center by a porous plate of 3 m/-φ. It is stored at both ends with a grid-like perforated plate of 3 m/m.

The opening of a potty sealed with human waste and urine was connected to the suction hole of this air purifier, and it was operated in a 25-d room and three panelists were asked to smell the odor in the room. It was hardly felt. Example 2 100 parts of a commercially available acidic deodorizing liquid extracted from plants of the Camellia family (Shirai Matsu Shinyaku Co., Ltd., trade name Fresca) was applied at 3 to 4 cm/m
Particle size calcium silicate molded body (manufactured by Tokuyama Soda Co., Ltd.)
It was made to adsorb to 50 parts. 100 parts of this adsorbent and 100 parts of the stabilized chlorine dioxide liquid adsorbent used in Example 1 were each housed in a breathable cloth bag and placed side by side in the flow path on the air intake side of a household air conditioner. When used in a room of What is adsorbed and regenerated?

Furthermore, the deodorizing effect was maintained for 30 days.

(that's all)

Claims (4)

[Claims] (1) A deodorizing method characterized by placing a combination of an adsorbent carrying an acidic deodorizing liquid extracted from plants and an adsorbent carrying a stabilized chlorine dioxide solution in a flow path of malodorous air. . (2) Claims in which the adsorbent supporting an acidic deodorizing liquid extracted from plants is a composition in which pyroligneous acid produced during dry distillation of wood is adsorbed onto a ceramic molded body or an activated alumina molded body. The deodorizing method according to item 1. (3) The deodorizing method according to claim 1, wherein the adsorption carrier used to obtain the adsorbate is a partially glazed ceramic molded body having an adsorption capacity of at least 10% by weight. (4) The deodorizing method according to claim 1, wherein the stabilized chlorine dioxide solution is an aqueous solution with a concentration of 0.1 to 6.0% and a pH of 10 to 11.