CN111565570A - Insect repellent and production method and production device of hypochlorous acid aqueous solution - Google Patents

Abstract

Provided are an insect repellent containing a substance that has an effect of repelling harmful organisms but lacks an insecticidal effect, as well as a method and apparatus for producing hypochlorous acid. The insect repellent contains an aqueous hypochlorous acid solution. In the method and apparatus for producing the aqueous hypochlorous acid solution, the water is purified by removing cations without removing anions (ST1), and the purified water is mixed with an inorganic acid and hypochlorite, or an aqueous solution containing chloride ions is electrolyzed in the purified water to produce the aqueous hypochlorous acid solution (ST2).

Description

Insect repellent and production method and production device of hypochlorous acid aqueous solution

technical field

The present invention relates to an insect repellent having an effect of repelling harmful organisms such as pests from a protected object such as a planting plant, and a production method and production apparatus of an aqueous hypochlorous acid solution usable as the insect repellent.

Background technique

Conventionally, insect repellents having an effect of repelling harmful organisms such as pests from objects to be protected, such as planting plants, have been used. Insect repellents are used, for example, in agriculture, and by spraying the insect repellents on planting plants, the effect of repelling pests from planting plants is exerted.

The repellent contains a substance that exhibits the above-mentioned repelling effect. For example, Patent Document 1 describes an insect repellent containing a tropolone derivative as a substance exhibiting a repelling effect. In addition, this document also describes that tropolone derivatives have insecticidal effects in addition to their repellent effects.

However, as in the insect repellent described in the above-mentioned Patent Document 1, if a substance that exhibits an insect repellent effect also exhibits an insecticidal effect, the substance exhibits an insecticidal effect and is harmful, which may adversely affect the human body and the protected object. danger. Therefore, in order to ensure higher safety to the human body and the protected object, it is necessary to develop an insect repellent containing a substance that has an insect repellent effect but has no insecticidal effect.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2004-307431

SUMMARY OF THE INVENTION

Invention to solve problem

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an insect repellent containing an insect repellent containing a compound having a compound capable of repelling harmful organisms, and a production method and production apparatus of an aqueous hypochlorous acid solution usable as the insect repellent. Substances that are effective but have no insecticidal effect.

means to solve the problem

In order to solve the above-mentioned problems, the present invention is an insect repellent characterized by containing an aqueous hypochlorous acid solution. According to the present invention, since the insect repellent contains an aqueous hypochlorous acid solution, it can be an insect repellent containing a substance having an effect of repelling harmful organisms but not having an insecticidal effect.

Furthermore, in the above-mentioned insect repellent, the hypochlorous acid concentration in the hypochlorous acid aqueous solution may be 5 ppm or more and 400 ppm or less. In this way, when the hypochlorous acid concentration of the hypochlorous acid aqueous solution is 5 ppm or more, the repelling effect of hypochlorous acid can be sufficiently exhibited. In addition, when the hypochlorous acid concentration of the hypochlorous acid aqueous solution is 400 ppm or less, the stimulation of the human body by hypochlorous acid can be suppressed.

Furthermore, in the above-mentioned insect repellent, the pH value of the hypochlorous acid aqueous solution may be 4.0 or more and 7.0 or less. In this way, since the pH of the hypochlorous acid aqueous solution is 4.0 or more and 7.0 or less, the hypochlorous acid aqueous solution can be kept weakly acidic, and the stimulation of the hypochlorous acid aqueous solution to the human body can be reduced. In addition, since the pH of the hypochlorous acid aqueous solution is 4.0 or more and 7.0 or less, the sterilizing function of hypochlorous acid extracting electrons from germs and the virus inactivating function of hypochlorous acid extracting electrons from viruses can be improved.

Furthermore, in the said insect repellent, the anion derived from the water used for the said hypochlorous acid aqueous solution may be contained in the hypochlorous acid aqueous solution. In this way, the anion is contained in the hypochlorous acid aqueous solution, and the anion exerts a pH buffering function, thereby effectively suppressing the rapid pH change of the hypochlorous acid aqueous solution and stabilizing the pH of the hypochlorous acid aqueous solution. That is, without the above-mentioned anion as a buffer material, there is a possibility of causing a sharp change in pH. It can also be said that when sodium hypochlorite comes into contact with an inorganic acid, the pH at the point of contact between them will drop sharply, chlorine gas will be generated, and the total amount of available chlorine will decrease, and in addition, it will put workers at risk. On the other hand, according to the present invention, the above-mentioned situation can be avoided by including anions in the hypochlorous acid aqueous solution.

In addition, the anion in this case may be at least one of bicarbonate ion, sulfate ion, nitrate ion, and phosphate ion.

In addition, in order to solve the above-mentioned problems, the present invention is a method for producing an aqueous hypochlorous acid solution, characterized in that the production method has a first step of removing cations from water but not removing anions to purify the water; and a second step, An aqueous solution of hypochlorous acid is produced by mixing an inorganic acid and a hypochlorite in the water purified by the first step, or by electrolyzing an aqueous solution containing chloride ions in the water purified by the first step.

According to the method for producing an aqueous hypochlorous acid solution of the present invention, when the water as a raw material is purified, cations are removed from the water, but anions are not removed. Therefore, the anion having a pH buffering function is contained in the aqueous hypochlorous acid solution, and at the same time, it is possible to Removes cations that capture the oxidative power of hypochlorous acid. In addition, when hydrochloric acid is added, the anion acts as a buffer material and can suppress a rapid reaction with sodium hypochlorite.

Furthermore, in the above-mentioned method for producing an aqueous solution of hypochlorous acid, the mixing of water, inorganic acid and hypochlorite can be performed by intermittently supplying the inorganic acid to the water and continuously supplying the hypochlorite to the diluted inorganic acid generated by supplying it. . In this way, by intermittently supplying the mineral acid to the water and continuously supplying the hypochlorite to the diluted mineral acid generated by the supply, it is possible to prevent the hypochlorous acid generated by mixing the water, the mineral acid and the hypochlorite from reacting with the mineral acid again. . Thereby, the hypochlorous acid concentration of the hypochlorous acid aqueous solution can be prevented from decreasing, and the gas generated by the reaction of the hypochlorous acid and the inorganic acid becomes bubbles, thereby preventing the worker's safety from decreasing.

In addition, the present invention is a production apparatus for producing the above-mentioned hypochlorous acid aqueous solution, characterized in that the production apparatus includes: a first apparatus for performing a first step of removing cations from water but not removing anions to purify the water; The second device performs the second step of mixing mineral acid and hypochlorite with the water purified by the first step, or performing electrolysis of an aqueous solution containing chloride ions in the water purified by the first step, thereby generating A hypochlorous acid aqueous solution; the second device includes: a pipe for supplying the water; a mineral acid supply part for intermittently supplying the inorganic acid to the pipe for supplying the water; and a hypochlorite supply part for supplying the water through the The water supplied with the mineral acid continuously supplies the hypochlorite.

As one embodiment of the invention described above, supplying the mineral acid intermittently by the mineral acid supply unit includes dividing and supplying the mineral acid in a plurality of times (dividing the total amount to be supplied into a plurality of times). In addition, the continuous supply of hypochlorite by the hypochlorite supply part includes supplying hypochlorite at one time (supplying all the hypochlorite together). Furthermore, in order to supply the inorganic acid in multiple times, the injection site of the inorganic acid may be divided into a plurality of places, or the injection may be divided into more precise amounts by setting a pump, and the injection may be performed multiple times. On the other hand, for hypochlorite, the entire amount can be injected at once.

In this way, by supplying the inorganic acid intermittently and continuously supplying the hypochlorite, it is possible to prevent the supplied inorganic acid from coming into contact with the hypochlorite at a high concentration, thereby suppressing the generation of gas due to the inorganic acid.

Furthermore, in the production apparatus of the hypochlorous acid aqueous solution, the piping may be an in-line stirrer having a stirring part for stirring the diluted inorganic acid. In this way, if the piping is an in-line agitator having a stirring part for stirring the diluted inorganic acid, the diluted inorganic acid can be stirred by the stirring part to generate the diluted inorganic acid in which the inorganic acid is evenly diluted, and the inorganic acid can be diluted effectively without causing the High concentrations of inorganic acids react with hypochlorous acid.

In addition, the code|symbol in the said parenthesis shows the code|symbol of the corresponding component in embodiment mentioned later as an example of this invention.

Invention effect

According to the insect repellent of the present invention, an insect repellent containing a substance having an effect of repelling harmful organisms but not having an insecticidal effect can be obtained. Moreover, according to the manufacturing method and the manufacturing apparatus of the hypochlorous acid aqueous solution of this invention, the hypochlorous acid aqueous solution of high quality and being hard to deteriorate can be manufactured safely and efficiently.

Description of drawings

FIG. 1 is a flowchart for illustrating a method for producing an aqueous hypochlorous acid solution according to an embodiment of the present invention.

2 is a block diagram showing an apparatus for producing an aqueous hypochlorous acid solution according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing a first example of an apparatus for producing an aqueous hypochlorous acid solution.

FIG. 4 is a schematic diagram showing a second example of an apparatus for producing an aqueous hypochlorous acid solution.

Detailed ways

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Next, the insect repellent of the present invention, the method for producing the aqueous hypochlorous acid solution of the present invention, the apparatus for producing the aqueous hypochlorous acid solution of the present invention, these production methods and the method for utilizing the aqueous hypochlorous acid solution produced by the production apparatus are performed in order. illustrate.

First, the insect repellent of the present invention will be described. The insect repellent of the present invention consists of an aqueous solution of hypochlorous acid. The hypochlorous acid concentration of the hypochlorous acid aqueous solution is 5 ppm or more and 400 ppm or less, and the pH is 4.0 or more and 7.0 or less. Furthermore, bicarbonate ion (anion) is contained in this hypochlorous acid aqueous solution.

As described above, according to the above-described embodiment, since the insect repellent is composed of an aqueous hypochlorous acid solution, it can be an insect repellent containing a substance having an effect of repelling harmful organisms but not having an insecticidal effect.

Further, according to the above-described embodiment, the hypochlorous acid concentration by the hypochlorous acid aqueous solution is more than 5ppm, the insect repellent function that hypochlorous acid has can be brought into full play, because the hypochlorous acid concentration of the hypochlorous acid aqueous solution is less than 400ppm, can suppress the time Stimulation of chloric acid on the human body.

Furthermore, according to the above-mentioned embodiment, since the pH of the hypochlorous acid aqueous solution is 4.0 or more and 7.0 or less, the hypochlorous acid aqueous solution can be maintained weakly acidic, and the stimulation of the hypochlorous acid aqueous solution to the human body can be reduced. In addition, since the pH of the hypochlorous acid aqueous solution is 4.0 or more and 7.0 or less, the sterilizing function of hypochlorous acid extracting electrons from germs and the virus inactivating function of hypochlorous acid extracting electrons from viruses can be improved.

In addition, according to the above-described embodiment, by including bicarbonate ions (anions) in the hypochlorous acid aqueous solution, the bicarbonate ions exert a pH buffering function, thereby suppressing pH changes of the hypochlorous acid aqueous solution and stabilizing the pH of the hypochlorous acid aqueous solution.

Next, the manufacturing method of the hypochlorous acid aqueous solution which can be used as the insect repellent of this invention is demonstrated with reference to FIG. 1. FIG. It should be noted that the production method described below and the hypochlorous acid aqueous solution produced by the production apparatus can of course be used for other purposes (for example, a sterilizing agent, a deodorant, etc.) in addition to the above-mentioned insect repellent. ). FIG. 1 is a flowchart for illustrating a method for producing an aqueous hypochlorous acid solution according to an embodiment of the present invention. The method for producing an aqueous hypochlorous acid solution shown in FIG. 1 includes a purification step (first step) ST1 for purifying water W as a raw material, and a production step for producing an aqueous hypochlorous acid solution L1 from the water W purified in the purification step ST1 (Second step) ST2.

The purification step ST1 of the water W is specifically a step of removing impurities (organic substances, metal ions) from the water W. In addition, the purification process ST1 does not remove anions such as bicarbonate ions contained in the water W. The purification step ST1 includes an organic substance removal step ST1-A for removing organic substances from water W, and a metal ion removal step ST1-B for removing metal ions (cations) from the water W from which the organic substance removal step ST1-A has removed organic substances.

In the organic matter removing step ST1-A, the organic matter is removed from the water W by passing the water W through a filter and recovering the organic matter contained in the water W with the filter. Thereby, the hypochlorous acid and the organic matter are prevented from reacting in the hypochlorous acid aqueous solution L1 produced in the subsequent production step ST2, and the hypochlorous acid concentration of the hypochlorous acid aqueous solution L1 is prevented from decreasing. Further, by reducing the concentration of organic substances in the hypochlorous acid aqueous solution L1, the safety of the hypochlorous acid aqueous solution L1 to the human body can be improved.

In the metal ion removal step ST1-B, the water W from which organic substances have been removed in the organic substance removal step ST1-A is supplied to the cation exchange resin, and the metal ions contained in the water W are adsorbed by the cation exchange resin to remove the metal ions in the water W. Metal ions removed from water W include sodium ions and heavy metal ions. Heavy metal ions are, for example, iron ions.

Here, in the metal ion removal step ST1-B, in order to prevent removal of anions such as bicarbonate ions from the hypochlorous acid aqueous solution L1, an apparatus for removing both cations and anions is not used. Specifically, zwitterion exchange resins, reverse osmosis membranes, and the like are not used.

Hypochlorous acid aqueous solution manufacturing process ST2 manufactures hypochlorous acid aqueous solution L1 by mixing the water purified by purification process ST1, hydrochloric acid (inorganic acid), and sodium hypochlorite (hypochlorite). Specifically, hydrochloric acid was added to water, and sodium hypochlorite was added to the water to which the hydrochloric acid was added. Thereby, the reaction of the following reaction formula (1) occurs to generate hypochlorous acid.

[hua 1]

HCl+NaOCl→HOCl+NaCl…(1)

Here, as shown in the following reaction formula (2), the hydrochloric acid and the hypochlorous acid produced in the production step ST2 are reacted again, and the hypochlorous acid is decomposed to generate chlorine gas. This reaction occurs easily in the presence of high concentrations of hydrochloric acid. Therefore, in the production process ST2, hydrochloric acid is first supplied to water to generate diluted hydrochloric acid, and then sodium hypochlorite is supplied to the diluted hydrochloric acid.

[hua 2]

HOCl+HCl→Cl ₂ +H ₂ O…(2)

In addition, hydrochloric acid has a function as a pH adjuster of the hypochlorous acid aqueous solution L1 manufactured by the hypochlorous acid aqueous solution manufacturing process ST2. Therefore, in order to make the pH of the hypochlorous acid aqueous solution L1 produced in production process ST2 in an appropriate range, the supply amount of hydrochloric acid is adjusted in production process ST2.

Here, by removing the metal ions from the water W in the metal ion removal step ST1-B, the metal ion concentration of the finally produced hypochlorous acid aqueous solution L1 is reduced, and the safety of the hypochlorous acid aqueous solution L1 to the human body is improved.

In addition, since the iron ion (metal ion) concentration of the hypochlorous acid aqueous solution L1 decreases, the iron ion (metal ion) in the hypochlorous acid aqueous solution L1 can be prevented from reacting with hypochlorous acid as shown in the following reaction formulae (3) and (4). , thereby preventing the hypochlorous acid concentration from decreasing.

[hua 3]

HOCl+5H ₂ O+2Fe ²⁺ →2Fe(OH) ₃ +Cl ^- +5H ⁺ …(3)

[hua 4]

HOCl+Fe ²⁺ → OH+Cl ^- +Fe ³⁺ …(4)

Furthermore, since the metal ion concentration of the hypochlorous acid aqueous solution L1 is reduced, the metal ions in the hypochlorous acid aqueous solution L1 can be prevented from reacting with bicarbonate ions and hydrochloric acid. Thereby, the reduction of the hydrogencarbonate ion concentration in the hypochlorous acid aqueous solution L1, the reduction of the pH buffering capacity based on the hydrogencarbonate ion, and the metal ion and chloride ion, hydrogencarbonate ion, sulfate ion, nitrate ion are prevented. The generation of chloride salts (impurities) caused by the reaction of phosphate ions (anions).

Here, in the purification step ST1, organic substances and metal ions are removed from the water W, and in the production step ST2, the mixing amount of each of water, hydrochloric acid, and sodium hypochlorite is adjusted, so that the hypochlorous acid aqueous solution L1 produced in the production step ST2 is inferior Chloric acid concentration is 5 ppm or more and 400 ppm or less, and pH is 4.0 or more and 7.0 or less.

As described above, according to the above-described embodiment, when the water W, which is the raw material of the hypochlorous acid aqueous solution L1, is purified, metal ions (cations) are removed from the water W, and bicarbonate ions (anions) are not removed. Metal ions (cations) are removed from the hypochlorous acid aqueous solution L1 while the hypochlorous acid aqueous solution L1 contains bicarbonate ions (anions) having a pH buffer function.

Further, according to the above-described embodiment, by intermittently supplying hydrochloric acid to water and continuously supplying sodium hypochlorite to the diluted hydrochloric acid generated by the supply, it is possible to prevent the hypochlorous acid generated by mixing water, hydrochloric acid and sodium hypochlorite from reacting with hydrochloric acid again. It should be noted that the intermittent supply of hydrochloric acid referred to here includes dividing the entire amount into a plurality of times and supplying the hydrochloric acid in small amounts each time. In addition, the continuous supply of sodium hypochlorite includes supplying the entire amount of sodium hypochlorite at one time (at once).

In addition, in the said embodiment, the order of the organic substance removal process ST1-A and the metal ion removal process ST1-B can be changed suitably.

Furthermore, in the above-described embodiment, in the production step ST2 of the hypochlorous acid aqueous solution, hydrochloric acid is used as the inorganic acid, but carbonic acid, sulfuric acid, phosphoric acid, nitric acid, etc. may be used instead of hydrochloric acid.

In addition, in the above-described embodiment, in the production step ST2 of the hypochlorous acid aqueous solution, sodium hypochlorite is used as the hypochlorite, but instead of sodium hypochlorite, magnesium hypochlorite, calcium hypochlorite, or the like may be used. In addition, sodium hypochlorite is liquid, and magnesium hypochlorite and calcium hypochlorite are granular.

In addition, in the above-mentioned embodiment, in the production step ST2 of the hypochlorous acid aqueous solution, instead of mixing water, hydrochloric acid, and sodium hypochlorite (mixing method), an aqueous solution containing chloride ions (for example, sodium chloride aqueous solution) A hypochlorous acid aqueous solution is produced by performing electrolysis (electrolysis type).

Next, the manufacturing apparatus of the hypochlorous acid aqueous solution is demonstrated. As shown in FIG. 2 , the production apparatus 1 of an aqueous hypochlorous acid solution includes a purification apparatus 10 for purifying water, and a mixing apparatus 100 for mixing sodium hypochlorite and hydrochloric acid with purified water. Furthermore, the purification apparatus 10 is provided with the organic substance removal filter 11 (organic substance removal apparatus) and the cation exchange resin 12 (cation removal apparatus). Here, the production apparatus 1 of the hypochlorous acid aqueous solution is an apparatus used for the production method of the hypochlorous acid aqueous solution shown in FIG. 1 . In addition, the purification apparatus 10 is an apparatus used in the purification process ST1 of water shown in FIG. Furthermore, the mixing apparatus 100 is an apparatus used in the manufacturing process ST2 of the hypochlorous acid aqueous solution shown in FIG. In addition, the organic substance removal filter 11 is an apparatus used in the organic substance removal process ST1-A shown in FIG. The cation exchange resin 12 is an apparatus used in the metal ion removal step ST1-B shown in FIG. 1 .

FIG. 3 is a schematic diagram showing a first example of the mixing device 100 . As shown in FIG. 3 , a mixing device 100-1 as a first example includes a pipe 2A having a stirring unit (in-line agitator), a water supply device 3 for supplying water W to the pipe 2A, and a hydrochloric acid supply for supplying hydrochloric acid A1 to the pipe 2A Device 4 (mineral acid supply device), and sodium hypochlorite supply device 5 (hypochlorite supply device) for supplying sodium hypochlorite B to piping 2A. The mixing device 100-1 further includes a connecting pipe 6 for connecting the piping 2A and the hydrochloric acid supply device 4, a pump 7 provided in the connecting pipe 6, and a backflow prevention valve 8 for preventing the liquid flowing through the piping 2A from flowing out to the connecting pipe 6 side, and It includes a connecting pipe 16 connecting the piping 2A and the sodium hypochlorite supply device 5 , a pump 17 provided in the connecting pipe 16 , and a backflow prevention valve 18 for preventing the liquid flowing through the piping 2A from flowing out to the connecting pipe 16 side.

The piping 2A is for mixing the water W, the hydrochloric acid A1, and the sodium hypochlorite B to manufacture the hypochlorous acid aqueous solution L1. Specifically, the piping 2A includes a water supply part 2a for supplying water W from the water supply device 3, a hydrochloric acid supply part 2b for supplying hydrochloric acid A1 from the hydrochloric acid supply device 4, a sodium hypochlorite supply part 2c for supplying sodium hypochlorite B from the sodium hypochlorite supply device 5, The stirring part 2d which stirs the water W, the hydrochloric acid A1, and the sodium hypochlorite B, and the discharge part 2e which discharges the manufactured sodium hypochlorite aqueous solution L1 to the outside of the system of the piping 2A.

In addition, the water supply part 2a, the hydrochloric acid supply part 2b, the sodium hypochlorite supply part 2c, the stirring part (in-line agitator) 2d, and the discharge part 2e are arranged in this order from the upstream side to the downstream side of the flow of the water W in the piping 2A. Thus, in the piping 2A, the water W supplied by the water supply part 2a is mixed with the hydrochloric acid A1 supplied by the hydrochloric acid supply part 2b to generate the diluted hydrochloric acid A2, and the diluted hydrochloric acid A2 is mixed with the sodium hypochlorite B supplied by the sodium hypochlorite supply part 2c to form a mixed solution M. Furthermore, the mixed solution M is stirred in the stirring part 2d, and the hypochlorous acid aqueous solution L1 containing hypochlorous acid is produced|generated. In addition, the generated hypochlorous acid aqueous solution L1 is discharged from the discharge part 2e to the outside of the system of the pipe 2A.

The stirring part 2d is a part which stirs the introduced mixed solution M, and may be a structure in which a stationary guide vane (not shown) is formed as an example. In this case, the mixed liquid M introduced into the stirring part 2d is introduced by the guide vane, and thus rotates. Thereby, the mixed solution M is stirred, and the hydrochloric acid and sodium hypochlorite contained in the mixed solution M react to generate hypochlorous acid. In addition, the stirring part 2d is not an essential component, and the stirring part 2d may be abbreviate|omitted. Furthermore, the specific structure of the stirring part 2d is not limited to the structure provided with the guide vane mentioned above, As long as the mixed liquid M can be stirred, the structure not provided with a guide vane may be sufficient.

The connecting pipe 6 is a hollow pipe connecting the hydrochloric acid supply part 2b of the piping 2A and the hydrochloric acid supply device 4, and guides the hydrochloric acid A1 supplied from the hydrochloric acid supply device 4 to the hydrochloric acid supply part 2b.

The pump 7 is provided for adjusting the amount of hydrochloric acid A1 supplied from the hydrochloric acid supply device 4 to the hydrochloric acid supply part 2b of the piping 2A. The pump 7 supplies the hydrochloric acid A1 flowing through the connection pipe 6 to the hydrochloric acid supply part 2b by a small amount or a preset amount, and supplies the hydrochloric acid A1 to the hydrochloric acid supply part 2b intermittently.

The backflow prevention valve 8 prevents the liquid flowing in the pipe 2A from flowing out of the hydrochloric acid supply part 2b. In addition, in the backflow prevention valve 8, the connection pipe 6 which supplies the hydrochloric acid A1 supplied from the hydrochloric acid supply apparatus 4 to the hydrochloric acid supply part 2b penetrates inside.

The connecting pipe 16 is a hollow pipe connecting the sodium hypochlorite supply part 2c of the piping 2A and the sodium hypochlorite supply device 5, and guides the sodium hypochlorite B supplied from the sodium hypochlorite supply device 5 to the sodium hypochlorite supply part 2c.

The pump 17 is provided in order to adjust the amount of the sodium hypochlorite B supplied from the sodium hypochlorite supply device 5 to the sodium hypochlorite supply part 2c of the piping 2A. The pump 17 supplies the entire amount of the sodium hypochlorite B flowing through the connecting pipe 16 to the sodium hypochlorite supply part 2c at one time, and continuously supplies the sodium hypochlorite B to the sodium hypochlorite supply part 2c.

The backflow prevention valve 18 prevents the liquid flowing inside the pipe 2A from flowing out of the sodium hypochlorite supply part 2c. In addition, in the backflow prevention valve 18, the connection pipe 16 which supplies the sodium hypochlorite B supplied from the sodium hypochlorite supply apparatus 5 to the sodium hypochlorite supply part 2c is penetrated inside.

Next, a second example of the mixing device 100 will be described. It should be noted that, in the description of the second example and the corresponding drawings, the same symbols are attached to the same or equivalent structural parts as those of the first example, and the detailed description of the parts is omitted below. In addition, matters other than the matters described below and matters other than those shown in the drawings are the same as those of the first example.

FIG. 4 is a schematic diagram showing the mixing apparatus 100-2 of the second example. The mixing apparatus 100-2 shown in FIG. 4 is provided with piping 2B instead of piping 2A with which the mixing apparatus 100-1 shown in FIG. 3 is equipped. This piping 2B is different from the piping 2A in that it has a first stirring part (in-line agitator) 2f between the hydrochloric acid supply part 2b and the sodium hypochlorite supply part 2c. And the 1st stirring part 2f has the same structure and function as the stirring part 2d in the mixing apparatus 100-1 shown in FIG. Furthermore, in the mixing device 100-2, the stirring part 2d in the piping 2A of the mixing device 100-1 is the second stirring part 2d.

In addition, from the upstream side to the downstream side of the flow of the water W in the piping 2B, according to the water supply part 2a, the hydrochloric acid supply part 2b, the first stirring part 2f, the sodium hypochlorite supply part 2c, the second stirring part 2d, and the discharge part 2e Sequential configuration. Thereby, in the piping 2B, the water W supplied from the water supply part 2a is mixed with the hydrochloric acid A1 supplied from the hydrochloric acid supply part 2b to generate the diluted hydrochloric acid A2, and the diluted hydrochloric acid A2 is stirred by the first stirring part 2f to become the diluted hydrochloric acid A3, which is diluted The hydrochloric acid A3 is mixed with the sodium hypochlorite B supplied from the sodium hypochlorite supply unit 2c to form a mixed solution M. Furthermore, by stirring the mixed liquid M in the 2nd stirring part 2d, the hypochlorous acid aqueous solution L1 containing hypochlorous acid is produced|generated. In addition, the produced hypochlorous acid aqueous solution L1 is discharged from the discharge part 2e to the outside of the system of the pipe 2B.

As described above, according to the above-described embodiment, the purification device 10 removes cations instead of anions from the water W, so that the water W contains anions having a pH buffering function, and can remove hypochlorous acid from the water W The oxidative power of the cations causes.

By removing the cations (metal ions) in this way, the cations can be prevented from reacting with hypochlorous acid and depriving the oxidizing power. In addition, by removing cations, it is possible to prevent metal ions and anions from forming salts during subsequent drying during spray application of insect repellents or sterilizers using the hypochlorous acid aqueous solution produced by the above production method and production apparatus. In particular, when calcium salts and magnesium salts are generated from calcium ions and magnesium ions contained in tap water, it is difficult to wipe them off due to insolubility. However, as described above, the generation of salts can be prevented, so this does not occur. The problem.

In addition, the hydrochloric acid A1 is intermittently supplied to the water W supplied to the pipes 2A and 2B, and the sodium hypochlorite B is continuously supplied to the diluted hydrochloric acid A2 and A3 generated by supplying the hydrochloric acid A1 to the water W, thereby preventing water, hydrochloric acid and Hypochlorous acid generated by mixing hypochlorite reacts with hydrochloric acid again. Thereby, the hypochlorous acid concentration of the hypochlorous acid aqueous solution L1 can be prevented from decreasing, and the gas generated by the reaction of hypochlorous acid and hydrochloric acid becomes bubbles, thereby preventing the safety of the operator from decreasing.

In addition, in the mixing device 100 (100-1, 100-2) of the above-described embodiment, the hydrochloric acid A1 is supplied to the pipe 2A to which the water W is supplied by the pump 7, and the intermittent supply of the hydrochloric acid A1 can be simplified.

It should be noted that, in the mixing device 100-2 of the above-described embodiment, chlorine gas is generated by contacting sodium hypochlorite in a state where the concentration of hydrochloric acid is high. Therefore, in order to avoid this situation, diluted hydrochloric acid is preliminarily performed in the first stirring part 2f. Stir to homogenize the concentration, and then mix the sodium hypochlorite. However, in addition to this, the hydrochloric acid supply part 2b for supplying hydrochloric acid may be provided in a plurality of places, and the hydrochloric acid may be supplied in a small amount at each place, or the hydrochloric acid may be divided into a plurality of times by the setting of the pump. supply.

Next, an example of the utilization method of the hypochlorous acid aqueous solution is demonstrated. In addition, in this description, the hypochlorous acid aqueous solution refers to the production method of the hypochlorous acid aqueous solution and the hypochlorous acid aqueous solution produced by the production apparatus according to the present invention. Specifically, it means the hypochlorous acid aqueous solution L1 shown in FIG. 1 .

Here, as an example of the application of the hypochlorous acid aqueous solution L1, the case where the hypochlorous acid aqueous solution L1 is used as a pest repellant will be described. First, an aqueous hypochlorous acid solution is accommodated in a container capable of spraying the internal liquid. Next, in a plastic greenhouse for growing Tremella, an aqueous solution of hypochlorous acid is sprayed on the Tremella under cultivation.

Here, after the hypochlorous acid aqueous solution is sprayed on the bacteria or viruses, the hypochlorous acid contained in the hypochlorous acid aqueous solution takes electrons from the bacteria or viruses, and inactivates these bacteria or viruses, the hypochlorous acid reacts as follows: (5) It reacts like this and separates into chloride ion and water. Thereby, the hypochlorous acid sprayed on the outside of the container becomes a harmless ion (chloride ion, water), and therefore does not have a bad influence on the human body and white fungus.

[hua 5]

HClO+H ⁺ +2e ^- →Cl ^- H ₂ O…(5)

Furthermore, it is possible to repel harmful organisms (Tenya japonica) for Tremella in planting. Sharp-eyed Mosquitoes are harmful organisms, which absorb the liquid produced by Tremella in planting, resulting in black spots on Tremella and reducing the commercial value of Tremella. However, by spraying an aqueous solution of hypochlorous acid on the white fungus, the sharp-eyed mosquitoes on this white fungus can be repelled.

In addition, as an insect repellent, the hypochlorous acid aqueous solution of this embodiment can be widely used for other uses other than the agricultural purpose exemplified above. As an example, it can also be used for repelling insects in food processing plants, and preventing flies in general household bran beds.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims and the technical ideas described in the specification and drawings.

Claims (9)

1. An insect repellent, characterized in that it contains an aqueous hypochlorous acid solution. 2. The insect repellent of claim 1, wherein: The hypochlorous acid concentration of the hypochlorous acid aqueous solution is 5 ppm or more and 400 ppm or less. 3. The insect repellent according to claim 1 or 2, wherein, The pH value of the hypochlorous acid aqueous solution is 4.0 or more and 7.0 or less. 4. The insect repellent of any one of claims 1 to 3, wherein, The hypochlorous acid aqueous solution contains anions derived from the water supplied to the hypochlorous acid aqueous solution. 5. The insect repellent of claim 4, wherein: The anion is at least one of bicarbonate ion, sulfate ion, nitrate ion, and phosphate ion. 6. a manufacture method of hypochlorous acid aqueous solution, is characterized in that, The manufacture method of described hypochlorous acid aqueous solution has: Step 1, purifying the water by removing cations but not anions from the water; and In the second step, a mineral acid and a hypochlorite are mixed with the water purified by the first step, or an aqueous solution containing chloride ions is electrolyzed in the water purified by the first step to generate an aqueous hypochlorous acid solution. 7. The manufacture method of the hypochlorous acid aqueous solution as claimed in claim 6, wherein, The mixing of the water, the inorganic acid and the hypochlorite in the second step is carried out by the following process: supplying the mineral acid to the water intermittently, The hypochlorite is continuously supplied to the diluted inorganic acid generated by the supply of the inorganic acid. 8. A production apparatus of an aqueous hypochlorous acid solution, which is a production apparatus for the production of an aqueous hypochlorous acid solution, It is characterized in that, the manufacturing apparatus includes: a first apparatus, performing a first step of removing cations from water but not removing anions to purify the water; and The second device performs a second step of mixing mineral acid and hypochlorite with the water purified by the first step, or performing electrolysis of an aqueous solution containing chloride ions in the water purified by the first step, thereby generating Aqueous hypochlorous acid, The second device includes: plumbing for supplying said water; an inorganic acid supply unit for intermittently supplying the inorganic acid to the piping for supplying the water; The hypochlorite supply unit continuously supplies the hypochlorite to the water to which the inorganic acid has been supplied. 9. The manufacturing apparatus of the hypochlorous acid aqueous solution according to claim 8, wherein, The said piping has a stirring part which stirs the said diluted mineral acid.

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