JP2010207539A - Indoor processing method and processing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely, efficiently, and easily generate a chlorine dioxide gas without causing explosion due to local raising of gas concentration at a place where the chlorine dioxide gas is required. <P>SOLUTION: In the processing method for indoor deodorization and sterilization, at least one of sodium chlorite and acid in a solution containing the sodium chlorite and acid arranged in an open container is measured in an amount wherein the local concentration within the open container of the chlorine dioxide gas generated by the reaction of the sodium chlorite and acid is <10%, and the measured solution containing one of the sodium chlorite and acid is arranged within the container, and the solution is heated to 50-95°C from outside the container, thus, the reaction is accelerated and the reaction is completed within a predetermined time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an indoor treatment method and treatment apparatus using chlorine dioxide gas for indoor deodorization or sterilization or sterilization of microorganisms.

  It has been proposed to use chlorine dioxide gas generated from an aqueous solution containing a chlorite and an inorganic or organic acid for decomposition removal and sterilization of indoor harmful chemical substances (for example, see Patent Document 1). According to this prior art, the aqueous solution accommodated in the container is sucked up from the inside of the container toward the room by an evaporation core utilizing capillary action. The aqueous solution is heated by the heating means surrounding the evaporation core in the process of being sucked up by the evaporation core, and the generation of chlorine gas due to the reaction of chlorite and acid in the aqueous solution is promoted. Chlorine dioxide gas is stably discharged into the room from the outlet.

  By the way, in the use of chlorine dioxide gas, there are strict regulations to ensure safety for the human body. For example, according to the American Industrial Hygienists Conference (ACGIH), chlorine dioxide has a short time of 15 minutes or less. As the exposure limit (TLV-STEL), 0.3 ppm is defined as the allowable concentration for each weighted average concentration (TLV-TWA) for working hours of 8 hours a day and 40 hours a week. . Therefore, referring to the TLV-STEL by ACGIH, in the environment where the chlorine dioxide gas concentration is 300 ppb, the presence of a person for a maximum of 15 minutes is only allowed.

  For this reason, in the deodorization or sterilization using the chlorine dioxide gas generator described above, it is necessary to stop the release of chlorine dioxide gas before a predetermined time is exceeded in order to ensure safety. However, even if heating by the heating means is simply stopped, generation of the gas dioxide by the reaction of the aqueous solution cannot be stopped. Therefore, in order to stop the release of chlorine dioxide gas into the room, for example, it is necessary to close the discharge port of the container.

  However, even if the container outlet is closed, the chlorine dioxide gas generation reaction proceeds in the closed container. Therefore, with the passage of time after the discharge port is closed, the volume concentration of chlorine dioxide gas in the closed space in the container increases. If the molar concentration exceeds 10%, explosion may occur.

  Therefore, a method and apparatus for deodorizing, sterilizing or sterilizing the room safely and efficiently using chlorine dioxide gas generated from an aqueous solution containing such chlorite and acid has been desired. In addition, in an indoor space where people stay, odors and bacteria do not have to be below a certain value on average, but there are few in some places, uneven distribution such as getting on the nose or breeding bacteria in another place, As a result, it is evaluated that the required quality is not satisfied.

  Accordingly, an object of the present invention is a method for generating chlorine dioxide gas safely, efficiently and simply without causing an explosion due to a local increase in the concentration of chlorine dioxide gas at a site where chlorine dioxide gas is required. And providing an apparatus. Furthermore, an object of the present invention is to provide an apparatus that can fill the entire room with a substantially uniform air quality with a smaller amount of gas.

  The present invention pays attention to the fact that the generation reaction of chlorine dioxide gas in an aqueous solution containing chlorite and acid is terminated by the consumption of at least one of chlorite and acid as raw materials. The basic principle is to measure and limit at least one raw material of chlorite and acid supplied in the container to a predetermined amount so that the reaction in the container will be completed after the passage of time. .

  The present invention based on this basic principle is a treatment method for sterilizing, sterilizing or deodorizing a room using chlorine dioxide gas generated by the reaction of both sodium chlorite and an acid, depending on the volume of the room to be treated. Chlorine dioxide generated by the reaction of both sodium chlorite and acid in an open container to which a mixed liquid containing sodium chlorite and acid for generating chlorine dioxide gas should be supplied Measuring the amount of the local concentration (molar concentration) of the gas not exceeding 10% in the open container, and supplying both of the measured ones into the container, the container from the outside of the container And heating the mixture in the range of 50 ° C. to 95 ° C., thereby promoting the reaction and terminating the reaction within a predetermined time.

  Even under no wind, as long as the amount of sodium chlorite supplied in the container is 10 g or less, regardless of the shape or size of the container, and the increase or decrease in the amount of acidic liquid, It is possible to prevent the local concentration from exceeding 10%. Therefore, the reaction can be completed without causing an explosion due to the increase in local concentration. Further, since the reaction can be efficiently promoted by promoting the reaction by the heating means, indoor treatment such as deodorization, sterilization, or sterilization using chlorine dioxide gas can be quickly performed. Thereby, safe and efficient indoor processing becomes possible using chlorine dioxide gas.

  The grounds for making sodium chlorite 10 g or less are as follows.

  Since the molecular weight of chlorine dioxide gas is 68 and that of air is 29, the chlorine dioxide gas generated in the cup-shaped container tends to sink to the bottom of the container. For this reason, if the concentration of chlorine dioxide gas at the bottom of the container exceeds about 10%, there is a risk of explosion that does not exhibit flammability. However, for example, in a container such as a commercially available paper cup, if the weight of the sodium chlorite powder 12 does not exceed about 10 g, the chlorine dioxide gas concentration is locally 10% in the container, as will be described later. As a result of the experiment, it was confirmed that the explosion could be prevented almost certainly.

  In this experiment, sodium chlorite powder was placed in a commercially available paper cup container having a capacity of 180 cc, and the weight of the powder was used as a parameter, and malic acid having a weight concentration of 40% to 60% in the container. The aqueous solution was injected so that the specific gravity ratio of the sodium chlorite powder to the powder was 2: 5, and the presence or absence of an explosion was confirmed.

  According to this experiment, it was found that in the absence of wind in the container 14, explosion may occur when the weight of the sodium chlorite powder exceeds 10 g, and the frequency increases when the weight exceeds 20 g. That is, by making the weight of the sodium chlorite powder not more than 10 g, even if the chlorine dioxide gas concentration at the bottom in the container is local, it can be kept at 10% or less, It has been found that the risk of explosion in a cup-shaped container can be greatly reduced. It has also been found that the risk of explosion can be reliably prevented by setting the weight of the sodium chlorite powder to 10 g or less. This does not depend on the capacity of the cup-shaped container as long as the bottom area of the cup-shaped container does not become extremely small. This is because the explosion is mainly caused by a local concentration increase.

Sodium chlorite powder can be used for the aqueous sodium chlorite solution. When the present invention is used indoors, for example, for the purpose of deodorization, 1.5 mg × deodorizing target room volume m ³ or more and less than 10 g of sodium chlorite powder can be used. Of course, it is desirable to measure the amount of the acidic solution according to the ratio of the number of moles reacted from the coefficient of the chemical reaction formula with the sodium chlorite powder and supply it into the container. Moreover, it can replace with measuring sodium chlorite powder, and can measure the acidic solution of the quantity according to the ratio of the number-of-moles which reacts with 10g of this sodium chlorite powder.

  By measuring according to the purpose of the indoor treatment, the treatment purpose can be effectively achieved without causing an increase in local concentration due to the reaction of the sodium chlorite aqueous solution and the acidic solution supplied into the container. Can do.

  It is desirable to set the heating temperature by the heating means so that the water in the solution in the container evaporates for more than about 5 minutes and less than about 20 minutes by the heating of the heating means. Thereby, more effective and quick indoor processing becomes possible.

  It is desirable to keep the relative humidity at about 50% RH or more in a sealed state in the chamber to be treated, thereby enhancing the deodorizing effect.

  Hydrochloric acid or sulfuric acid can be used as the acidic solution. For example, it is advantageous to use an edible organic acid such as malic acid, citric acid or acetic acid because it can be handled safely and easily.

  The pH value of the acidic solution is desirably 3 or less in order to obtain a reliable and rapid reaction.

  The container may be a heat-resistant paper that has been subjected to water-impermeable treatment or a cup-shaped container made of metal. Since the material of the container is used for heating, metal is preferable from the viewpoint of good heat conductivity. On the other hand, when disinfecting or deodorizing at a plurality or many places at the same time as in a guest room of a hotel, heat-resistant paper is preferable from the viewpoint of making it disposable and saving the trouble of washing containers.

  It is desirable to remove residual chlorine dioxide gas in the room by operating a blower with an activated carbon filter that circulates and filters the room air after moisture in the container has disappeared by evaporation.

  The method according to the present invention can be suitably performed using the processing apparatus according to the present invention. The processing apparatus according to the present invention is a container having an open top and a solution to be placed in the container, the solution containing sodium chlorite and an acid, and at least one of the sodium chlorite and the acid. A solution in which the local concentration of chlorine dioxide gas generated by the reaction between the two in the open container is measured in an amount not exceeding 10%, and a solution disposed at the bottom of the container, Heating means for heating in the range of ° C., wherein the reaction is promoted by the heating means, and the reaction is completed within a predetermined time.

  The heating means causes the water in the container to disappear by evaporation, whereby the reaction is completed within a predetermined time.

  The heating means can be, for example, a coiled heating wire. The heating wire can be disposed, for example, at the bottom of the container, and can be disposed by surrounding the peripheral wall portion of the container, and further, the outside of the heating wire can be surrounded and covered with a heat insulating material.

  Further, a housing for housing the heating means and the container, wherein the open end of the container is exposed to the atmosphere, and an air outlet is formed on the outer periphery of the open end, and the air disposed in the housing An air blower that generates an air flow upward from the jet nozzle can be provided. The blower supplied from the blower into the housing rises through the air jet through the processing target chamber, and the chlorine dioxide gas released from the open end of the container along with the rising flow is effectively introduced into the chamber. Can be dispersed.

  The blower has an air intake port and an air discharge port, and the air intake port is preferably opened to the outside of the housing in order to generate an effective air flow in the housing. Further, the air discharge port can be directed to generate an air flow toward the air outlet through the outer periphery of the container below the container of the housing. Chlorine dioxide gas is heavier than air, and in order to diffuse the chlorine dioxide gas into the room, it is desirable to transport the chlorine dioxide gas to the upper part of the room such as the ceiling surface, and the entire room contains chlorine dioxide gas. In order to fill with a homogeneous air quality, it is advantageous to provide a blower as described above.

  A shelf for placing the container on the housing can be provided, a heat insulating plate is disposed between the shelf and the container, and an electric heater is disposed as the heating means between the heat insulating plate and the container. it can. The shelf prevents a reduction in the heating effect of the heating means due to the air flow by preventing the air flow of the blower from being directed directly to the heating means. Moreover, the said heat insulation board suppresses the reduction of the heating effect by the said heating means by suppressing the conduction to the said shelf of the thermal energy by the said heating means.

  The air discharge port of the blower can be opened toward the lower surface of the shelf below the shelf, thereby effectively generating an upward air flow from the air outlet.

  According to the present invention, as described above, the generation reaction of chlorine dioxide gas can be promoted and terminated within a predetermined time without causing an explosion due to an increase in the local concentration of chlorine dioxide gas in the container. Therefore, indoor treatment such as deodorization, sterilization or sterilization using chlorine dioxide gas can be performed quickly and safely.

It is sectional drawing which shows roughly the processing apparatus used for the indoor processing method which concerns on this invention, It is explanatory drawing which shows typically the experimental apparatus using the processing apparatus shown in FIG. The data obtained by the experimental apparatus shown in FIG. 2 is a graph showing the relationship between the elapsed time from the start of chlorine dioxide gas generation and the chlorine dioxide concentration, with the heating temperature as a parameter, It is a graph showing the relationship between the elapsed time from the start of chlorine dioxide gas generation and the chlorine dioxide concentration when applying the indoor treatment method according to the present invention to deodorization of smoking odor, It is a graph which shows the relationship between the elapsed time from the chlorine dioxide gas generation start when the indoor processing method concerning this invention is applied to the deodorization of a perfume odor, and a chlorine dioxide density | concentration.

  The features of the present invention will become more apparent from the following description along with the illustrated embodiments.

  In FIG. 1, an apparatus for carrying out the indoor processing method according to the present invention is indicated generally by the reference numeral 10. The indoor processing apparatus 10 according to the present invention includes, for example, a rectangular housing 12, and a container 14 and a blower 16 that are open in the upper end and are accommodated in the housing. The housing 12 includes a rectangular housing 12a having an open upper end and a lid 12b disposed at an open end in the housing. The lid 12b is provided with, for example, a rectangular opening 18 for receiving the edge spaced from the edge of the open end 14a of the container 14. The open end 14a of the container 14 may be on the same plane as the lid 12b, and may be positioned on a surface slightly higher or lower than the surface of the lid 12b. Further, the container 14 can be lowered into the housing 12 from the opening 18 after the solution to be described later is prepared. As the housing 12, for example, a housing having vertical (L), horizontal (W) and height (H) dimensions of 300 mm, 200 mm and 200 mm was used. Not only this example but the housing 12 of various shapes and dimensions can be used as appropriate.

  A shelf 20 on which the container 14 is placed is formed in the housing 12. The shelf 20 faces an air outlet of a blower described later, and has an area and a planar shape sufficient to cover all the air outlets if it is assumed to be in contact with the air outlet. A heat insulating plate 22 is disposed on the shelf 20. On this heat insulation board 22, the heating means 24 which consists of an electric heater with a timer, for example is arrange | positioned. The container 14 is arranged so that the bottom thereof is placed on the heating means 24. Thus, the container 14 is held on the shelf 20 so that the edge of the open end 14a of the container 14 is spaced from the opening edge in the vicinity of the opening 18 of the lid 12b.

  Instead of arranging the heating means 24 made of an electric heater at the bottom of the container 14 as described above, for example, a heating means made of a coiled heating wire is arranged around the peripheral wall portion of the container 14, and the heating wire Can be surrounded by a heat insulating material. These heating means can be used properly depending on whether the container 14 is a flat type or a vertical cylinder type. If it is the former, it is possible to arrange at the bottom of the container 14, and if it is the latter, it is possible to surround the peripheral wall of the container 14 and arrange the heating means. The arrangement of the heating means is preferably an arrangement that can heat the solution intensively. Moreover, it replaces with arrange | positioning on the outer side of the container 14 as mentioned above, and the form provided in a container and immersed in a solution can also be employ | adopted for a heating means. In this case, since the lower part of the container 14 is cooler than the upper part from the viewpoint of efficient use of heat, the heating means is preferably incorporated in the lower part of the container 14 as described above.

  Moreover, when providing a heating means outside the container 14, it can also be set as the laminated structure which pinched | interposed the layered heat insulating material in the installation location of this heating means.

  The container 14 is formed of, for example, a stainless steel material or aluminum material having a thickness of 0.3 mm, and is a rectangular cup having a rectangular bottom surface of 30 mm × 30 mm and a height of 30 mm.

  The container 14 is supplied with an acidic liquid 28 in which malic acid powder, which is an edible organic acid, and a chlorous acid solution 26 are dissolved.

  The reaction in which chlorine dioxide gas is generated by the reaction of the chlorous acid solution 26 and the acidic solution 28 is well known in the art, and the reaction between the chlorous acid solution and malic acid is as follows.

4NaClO ₂ + 4HOOC-CH (OH) -CH ₂ -COOH + O ₂ → 4NaOOC-CH (OH) -CH ₂ -COOH + 4ClO ₂ + 2H ₂ O

In the method according to the present invention, for example, in order to deodorize the room, the amount of sodium chlorite in the chlorite solution 26 is 1.5 mg × m ³ of the target room volume m ³ or more and 10 g or less. In such a range, a predetermined amount corresponding to the object to be deodorized is measured.

For example, a chlorite solution 26 formed by dissolving 0.0275 g of sodium chlorite powder in 4 cc of distilled water is used for the purpose of deodorizing smoking odor in a hotel room having a room volume of 18 m ³ . Similarly, an acidic solution 28 formed by dissolving 0.11 g of malic acid powder in 4 cc of distilled water was used.

  Thus, by setting the amount of sodium chlorite to be measured to 10 g or less, the local concentration of chlorine dioxide gas in the container 14 causes an explosion even in the absence of wind and regardless of heating. It was possible to reliably prevent exceeding the critical value. This is described in paragraphs 0011 to 0014 of the present specification, and has been made clear in the specification of the prior Japanese Patent Application No. 2008-85890.

  Further, the heating reaction of the mixed liquid (26 and 28) in the container 14 by the heating means 24 can accelerate the generation reaction of chlorine dioxide gas.

  Furthermore, the chlorine dioxide gas released from the open end 14a of the container 14 can be effectively dispersed in the chamber to be deodorized by the blowing effect of the blower 16.

  That is, the blower 16 opens the air intake port 16a to the outside of the housing 12a, and opens the air discharge port 16b toward the shelf below the shelf 20. For this reason, the air flow 30 from the air discharge port 16b is directed to the edge of the shelf by the shelf 20, wraps around the edge, and further passes through the outer periphery of the container 14 to the open end 14a and the opening 18 of the lid 12b. Blow out upward from the gap. Further, since the blower 16 takes in air from the outside of the housing 12 through the air intake port 16a and the in-housing duct connected to the air intake port, the air flow 30 is not disturbed, and this Reduction of the blowing effect of the blower 16 due to the disturbance is prevented. Further, since an air jet is formed around the edge of the open end 14a of the container 14 from which the vaporized chlorine dioxide gas is released, the chlorine dioxide gas is accompanied by an upward air flow. Then transported.

  Therefore, the chlorine dioxide gas generated in the container 14 is entrained in the air flow 30 from between the open end 14a and the opening 18 of the lid 12b, and is effectively dispersed in the target chamber.

  In addition, by operating the air blower 16 in the operating state of the air conditioner provided in the room (including only the air blowing mode without circulating a heat medium through the heat exchanger of the air conditioner), By flowing, chlorine dioxide gas can be diffused more effectively.

As the blower 16, an electric motor of 1.3 php was used as its drive source, and an air flow rate showing an ability of 2.4 m ³ / min was used. The blower 16 is not limited to this and may be one that exhibits various capabilities.

  By using the shelf 20 having an area sufficiently larger than the area of the heating unit 24, it is possible to prevent the air flow around the shelf 20 from taking a large amount of heat of the heating unit 24. The chlorine dioxide gas can be effectively dispersed indoors without impairing the effect.

  Further, the heat insulating plate 22 inserted between the heating means 24 and the shelf 20 acts to relatively enhance the heating effect by the heating means 24 by blocking the heat conduction from the heating means 24 to the shelf 20. .

  According to the method of the present invention using the indoor processing apparatus 10 described above, the reaction of the measured mixed liquid in the container 14 proceeds rapidly by the promotion of the reaction by the heating described above. Further, due to the measurement of sodium chlorite in the chlorite solution 26, the chlorine dioxide gas concentration in the container 14 does not exceed 10% during the progress of this reaction. Accordingly, the reaction proceeds without causing an explosion due to a local increase in the concentration of chlorine dioxide gas, and the chlorine dioxide gas is effectively dispersed in the deodorized target chamber until the reaction is terminated due to consumption of the measured reaction material. .

As shown in FIG. 2, the relationship between the chlorine dioxide gas concentration and the elapsed time from the start of the chlorine dioxide gas generation reaction was determined using the indoor processing apparatus 10 of the present invention. That is, a chlorite solution 26 formed by dissolving 0.0275 g of sodium chlorite in 4 cc of distilled water in a hotel room 32 having a room volume of 18 m ³ and 0.11 g of apple in 4 cc of distilled water. The acidic liquid 28 formed by dissolving the acid was supplied to the container 14 of the indoor processing apparatus 10. However, in this experiment, the housing 12 and the air blower 16 are not used, and an air conditioner (not shown) is operated in an air-only mode without air conditioning to circulate room air, thereby allowing chlorine dioxide gas to enter the room. Flow diffusion was attempted.

  The interior of the guest room 32 was maintained at 20 ° C. by an air conditioner (not shown), and the humidity in the guest room 32 was maintained at 60% RH by the humidifier 34 having the humidity sensor 34a and the controller 34b. Under this environment, the heating temperature in the container 14 was controlled based on a detection signal from a temperature sensor 24 a made of a thermocouple incorporated in the heating means 24. The concentration of chlorine dioxide gas in the cabin 32 was measured by a chlorine dioxide concentration meter 36 connected to the cabin 32 through a gas discharge tube 36a and a gas suction tube 36b. The model IS4330-1000b purchased from JMS Co., Ltd. was used for the chlorine dioxide concentration meter 36.

  In the experiment, the relationship between the elapsed time t (minutes) from the start of the chlorine dioxide gas generation reaction and the chlorine dioxide gas concentration (ppb) in the cabin 32 was obtained using the heating temperature as a parameter. The result of this experiment is shown in the graph of FIG. The horizontal axis of the graph represents elapsed time t (minutes), and the vertical axis thereof represents chlorine dioxide gas concentration (ppb).

  The characteristic line 38a in the graph of FIG. 3 shows the result when the heating temperature is 30 ° C. Similarly, the characteristic line 38b is 40 ° C, the characteristic line 38c is 50 ° C, the characteristic line 38d is 60 ° C, the characteristic line 38e is 70 ° C, the characteristic line 38f is 80 ° C, the characteristic line 38g is 90 ° C, and the characteristic line 38h is The 95 ° C. and characteristic line 38i show the respective measurement results at 100 ° C.

  As is apparent from the graph of FIG. 3, a heating temperature exceeding 50 ° C. can provide a sharper rising characteristic than a temperature characteristic due to a lower heating temperature, and a peak of chlorine dioxide gas concentration within 20 minutes. It can be seen. Therefore, it can be said that a heating temperature exceeding 50 ° C. is appropriate for obtaining an efficient deodorizing effect in a relatively short time. This point is extremely important in targeting hotels and the like that need to deodorize a large number of guest rooms. Moreover, since the water | moisture content in the container 14 evaporates rapidly at 100 degreeC, it is preferable to avoid the heating at 100 degreeC.

  Further, when chlorine dioxide gas is used for deodorizing odor-generating substances adhering to the object surface or sterilizing or sterilizing microorganisms adhering to the object surface in a sealed space, the following two points are important.

  (1) The magnitude of the effect of deodorization, sterilization or sterilization is determined by the magnitude of the chlorine dioxide gas concentration exceeding a certain value that lasts for 5 minutes. For example, when trying to deodorize the smoking odor adhering to the bed or curtain in a hotel guest room with chlorine dioxide gas, it was necessary that the chlorine dioxide gas concentration of 100 ppb or more lasted for 5 minutes. Moreover, when trying to deodorize the perfume odor adhering to the bed or curtain in a hotel guest room with chlorine dioxide gas, it was necessary to continue the chlorine dioxide gas concentration of 1 ppm or more for 5 minutes.

  (2) In order to increase the work efficiency of deodorization and sterilization, it is essential that the 5 minute duration of chlorine dioxide gas concentration above a certain value appears as early as possible after gas generation. In the case of deodorization of smoking odors in hotel rooms, in order to prepare the number of deodorized guest rooms that can be checked in within a limited time, it is necessary to complete the deodorization operation per room within, for example, 20 minutes. As a guide, it is necessary that the peak value of chlorine dioxide concentration also appears within 20 minutes.

  From the above points, the heating temperature of the solution in the container 14 is between 50 ° C. and 95 ° C., and the water in the container 14 evaporates in about 5 minutes and less than about 20 minutes. That is, it is desirable to heat so that the reaction is completed.

  In the Odor Control Law, the odor intensity is classified as shown in the following table based on human sensory tests.

Table 1 6-level odor intensity

Sucking a single cigarettes every hour in a single room of 18m ^3, after this was repeated three times (3 hours of the three tobacco smoke release), the smoking odor that was ingrained in the bed cover was determined in accordance with Table 1 As a result, the odor intensity was 3.

  Table 2 shows the amounts of sodium chlorite and malic acid used for each of chlorine dioxide peak concentrations of 40 ppb, 60 ppb, 80 ppb, 100 ppb, and 150 ppb at a room temperature of 20 ° C., a heating temperature of 60 ° C., and a relative humidity of 60% RH. It is the result of the sensory test at the time of using it in proportion to chlorine concentration.

  That is, in the example shown by the characteristic line 38d indicating the heating temperature of 60 ° C. in the graph of FIG. 2, a peak concentration of 140 ppb was obtained. As shown in Table 2, for example, a peak of 100 ppb was obtained. In order to obtain the concentration, the amount of chemical used is 5/7, that is, a chlorite solution 26 in which 0.0196 g (0.0275 g × 5/7) sodium chlorite is dissolved in 4 cc of distilled water, A mixed solution with an acidic solution 28 obtained by dissolving 0.0786 g of malic acid powder in 4 cc of distilled water is used.

  The duration of each concentration almost coincided with the case of the characteristic line 38d in FIG. As a result, it has been clarified that a chlorine dioxide gas peak concentration of at least 100 ppb or more is necessary for deodorizing a smoking odor having an odor intensity of 3.

  Furthermore, Table 3 shows the results of measuring the deodorizing effect of smoking odor equivalent to the case of obtaining Table 2 with only the relative humidity% RH being changed when the chlorine dioxide gas peak concentration is 150 ppb.

  According to Table 3, when the relative humidity is less than 50% RH, the odor intensity is only lowered from 3 to 2, but when the relative humidity is 50% RH or more, the odor intensity is 3 to 1 to 3 to 0. Declined.

  Furthermore, the test of the same deodorizing effect was done about perfume odor. The amount of sodium chlorite and malic acid used was 10 times that of smoking odor removal. As a result of examining the influence of concentration and the influence of humidity, it was found that a relative humidity of 50% RH or more is desirable, and in that case, a chlorine dioxide peak concentration of at least 1 ppm or more is necessary.

  From the above, in the treatment method using the indoor treatment apparatus 10 of the present invention, it is preferable to maintain at least the relative humidity of the room to be deodorized at 50% RH or higher.

FIG. 4 is a graph showing the relationship between the measured chlorine dioxide gas concentration and the elapsed time for smoking deodorization in a 39 m ³ single room of a hotel. A chlorite solution 26 formed by melting 0.06 g of sodium chlorite in 3 cc of distilled water, and an acidic solution 28 formed by melting 0.18 g of malic acid powder in 3 cc of distilled water Arranged in the container 14, chlorine dioxide gas was generated. The indoor relative humidity was maintained at 60% RH, and the blower 16 was activated for this measurement. The heating temperature by the heating means 24 was set to 70 ° C.

  According to FIG. 3, after 15 minutes, the indoor chlorine dioxide gas concentration is less than 100 ppb. Therefore, in the weighted average concentration (TLV-TWA) described above by the American Industrial Hygienists Conference (ACGIH), 100 ppb is determined as the allowable concentration, so even if a person enters the room after 15 minutes, It can be seen that safety is compensated.

  Moreover, after the water | moisture content in the said container lose | disappears by evaporation, it is desirable to remove the indoor chlorine dioxide gas by operating the air blower with an activated carbon filter which circulates and filters the said indoor air. Thereby, the influence on the health by residual chlorine dioxide gas can be excluded more reliably.

FIG. 5 is a graph showing the relationship between the chlorine dioxide gas concentration expected from the graph of FIG. 3 and the elapsed time for the perfume deodorization in a 39 m ³ single room of a hotel. According to this graph, the chlorine dioxide gas concentration becomes 300 ppb or less after about 18 minutes from the start of the treatment. Therefore, TLV-STEL safety standards are considered to be satisfied at least 20 minutes after the start of processing.

  As described above, an example in which both sodium chlorite powder and acid powder are weighed has been described, but sodium chlorite and acid stock solutions can be used. In this case as well, if one of the two materials is weighed so that the local concentration of chlorine dioxide gas in the container does not exceed 10%, the generation reaction of chlorine dioxide gas is terminated by the consumption of the weighed material. As a result, the effects of the present invention can be achieved.

  As the acid, hydrochloric acid or sulfuric acid can be used, but in addition to the above-described malic acid, citric acid, nitric acid, fumaric acid, succinic acid, gluconic acid, lactic acid, acetic acid, adipic acid, phytic acid, ascorbic acid and the like. An edible acid or a mixture thereof recognized as a food additive can be used. The pH value of these acidic solutions is desirably 3 or less in order to obtain a reliable and rapid reaction.

  In the above description, an example using a stainless steel or aluminum container has been described. Instead of this metal container, a cup-shaped container made of a water-impermeable material such as heat-resistant paper subjected to water-impermeable treatment can be used. This cup-shaped container is a material used for baking confectionery and the like, can be easily obtained in the market, and is convenient for disposal after use. Further, the heat-resistant paper or the like may be stored in contact with the above-described metal container.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Indoor processing apparatus 12 Housing 14 Container 16 Blower 16a Blower air intake 16b Blower air outlet 18 Housing opening 20 Shelf 22 Heat insulation board 24 Heating means (electric heater)
26 Chlorous acid solution 28 Acidic solution

JP 2006-290717 A

Claims (12)

An indoor treatment method for deodorizing a room using chlorine dioxide gas generated by a reaction between sodium chlorite and an acid, or sterilizing or sterilizing microorganisms in the room,
With respect to at least one of sodium chlorite and acid in a solution containing sodium chlorite and acid to be placed in the open container, chlorine dioxide gas generated by the reaction of the two is locally in the open container. Weighing the amount not exceeding 10%, placing the weighed solution containing the one in the container, heating the solution from the outside of the container in the range of 50 ° C to 95 ° C, An indoor treatment method comprising promoting the reaction thereby, and terminating the reaction within a predetermined time. For the sodium chlorite, an aqueous solution of sodium chlorite is used, an acidic solution is used as the acid, the two solutions are supplied as a mixed solution into the container, and the sodium chlorite solution is the solution. The indoor treatment according to claim 1, wherein the sodium chlorite in the solution is a solution obtained by dissolving sodium chlorite powder measured in an amount of 1.5 mg × deodorizing target room volume m ³ or more and less than 10 g with water. Method.   The indoor treatment method according to claim 2, wherein the water in the solution in the container evaporates in a period of more than about 5 minutes and less than about 20 minutes by heating of the heating means.   The indoor processing method according to any one of claims 1 to 3, wherein the room is kept in a sealed state and a relative humidity is maintained at about 50% RH or more.   The indoor treatment method according to any one of claims 1 to 4, wherein the acidic liquid is an edible acid having a pH value of 3 or less.   The indoor treatment method according to any one of claims 1 to 5, wherein the container is a heat-resistant paper or a cup-shaped container formed of metal subjected to a water-impermeable treatment.   Furthermore, after the water | moisture content in the said container lose | disappears by evaporation, the indoor carbon dioxide gas is removed by operating the air blower with an activated carbon filter which circulates and filters the said indoor air. The indoor processing method according to one item. An indoor treatment device for deodorizing a room using chlorine dioxide gas generated by the reaction of sodium chlorite and an acid, or sterilizing or sterilizing indoor microorganisms,
A container with an open top;
A solution to be placed in the container, containing sodium chlorite and an acid, and at least one of the sodium chlorite and the acid in the open container of chlorine dioxide gas generated by the reaction of the two A solution weighed in such an amount that the local concentration in does not exceed 10%;
A heating unit disposed in the container and configured to heat the solution in a range of 50 ° C. to 95 ° C. to dissipate moisture in the container by evaporation. The heating unit accelerates the reaction, and the reaction is performed in a predetermined manner. The indoor processing device is finished within the time.   Further, a housing for housing the heating means and the container, wherein the open end of the container is exposed to the atmosphere, and an air outlet is formed on the outer periphery of the open end, and the air disposed in the housing The indoor processing apparatus of Claim 8 containing the air blower which produces | generates an air flow upwards from a jet nozzle.   The blower has an air intake port and an air discharge port, and the air intake port is opened to the outside of the housing, and the air discharge port is disposed below the container of the housing and extends around the outer periphery of the container. The indoor treatment apparatus according to claim 9, wherein the indoor treatment apparatus is directed to generate an air flow toward the air outlet.   The housing is provided with a shelf on which the container is placed, a heat insulating plate is disposed between the shelf and the container, and an electric heater is disposed as the heating means between the heat insulating plate and the container. The indoor processing apparatus according to claim 10.   The indoor processing apparatus of Claim 11 with which the air discharge port of the said air blower is opened toward the lower surface of this shelf below the said shelf.

Images