JP3110702B2 - Dilution method and dilution apparatus for concentrated hypochlorous acid aqueous solution - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, medical facilities,
Technology related to the preparation of aqueous hypochlorous acid solution suitable for disinfection and sterilization of workers' hands and utensils in food factories, etc. More specifically, dilute concentrated hypochlorous acid aqueous solution with water and adjust the concentration of hypochlorous acid to an appropriate concentration. The present invention relates to a diluting method and a diluting apparatus capable of preparing a chloric acid aqueous solution.

[0002]

2. Description of the Related Art For example, when chlorine gas is blown into water to dissolve it or sodium hypochlorite is dissolved in water, hypochlorous acid (HCl) is dissolved in a pH range of about 4 to 6.5.
O) is generated. This aqueous solution of hypochlorous acid is relatively safe for the human body and has a strong bactericidal action. Therefore, it has been used for a long time for sterilizing pools, foods and the like. In addition, the aqueous solution of hypochlorous acid can also be generated by electrolyzing water to which salt has been added (Japanese Patent Publication No. 4-4207).
No. 7).

[0003]

When an aqueous solution of hypochlorous acid as described above is to be used in, for example, a medical facility, a food factory, etc., large-scale facilities for blowing chlorine gas and a water electrolysis apparatus are installed. That is, it is impossible in terms of cost and space, so store the concentrated hypochlorous acid aqueous solution manufactured in the factory etc. in a storage tank etc., and moderate this concentrated hypochlorous acid aqueous solution with water. It is convenient to be able to use while diluting.

However, concentrated hypochlorous acid aqueous solution is
Chlorine gas is easily generated, and the chlorine gas generated in the surroundings may have a dangerous concentration. On the other hand, when trying to supply hypochlorous acid aqueous solution adjusted to an appropriate concentration to each medical facility, food factory, etc., a large amount of aqueous solution must be transported, and it is necessary to carry out both in terms of cost and handling. Was difficult.

Accordingly, it is an object of the present invention to provide a diluting method and a diluting apparatus which allow a concentrated aqueous solution of hypochlorous acid to be safely diluted.

[0006]

Means for Solving the Problems To achieve the above object, one aspect of the present invention is to supply a concentrated aqueous solution of hypochlorous acid to a closed concentrated solution storage tank, and from the concentrated solution storage tank to supply a concentrated solution of concentrated hypochlorous acid. A predetermined amount of a chloric acid aqueous solution is supplied to the mixed dilution solution tank, and a concentrated hypochlorous acid aqueous solution is mixed with dilution water in the mixed dilution solution tank to prepare a predetermined concentration of hypochlorous acid aqueous solution. A method for diluting the concentrated hypochlorous acid aqueous solution, wherein the concentrated hypochlorous acid aqueous solution is taken out of the concentrated solution storage tank when the concentrated hypochlorous acid aqueous solution is introduced into the concentrated solution storage tank. The chlorine-containing air generated and retained in the space is released to the outside and the upper space of the mixed dilution solution tank through the water in which the dilution water is stored, thereby dissolving and absorbing the chlorine in the dilution water and rendering it harmless. , The concentrated solution When supplying the concentrated hypochlorous acid aqueous solution from the reservoir to the mixed diluted solution tank, in order to eliminate the pressure reduction in the concentrated solution storage tank caused thereby, air in the upper space of the mixed diluted solution tank or outside air Is introduced into the concentrated aqueous solution of hypochlorous acid in the concentrated solution storage tank through a ventilation pipe to equalize the pressure of the concentrated solution storage tank. Is provided.

Another object of the present invention is to provide a concentrated solution storage tank for storing a concentrated aqueous solution of hypochlorous acid, a concentrated aqueous solution of hypochlorous acid supplied from the concentrated solution storage tank, and a diluent supplied from the outside. A mixed dilution solution tank for preparing a hypochlorous acid aqueous solution having a predetermined concentration by mixing with water, and air containing chlorine gas generated and retained in the upper space of the concentrated solution storage tank, are supplied to the mixed dilution solution tank. A chlorine gas introduction pipe for introducing into the diluted water, and a vent inserted at one end into the concentrated hypochlorous acid aqueous solution in the concentrated solution storage tank and the other end disposed in the upper space or outside of the mixed diluted solution tank. A concentrated hypochlorous acid aqueous solution diluting device, comprising: a pipe; and a liquid sending unit configured to supply the concentrated hypochlorous acid aqueous solution in the concentrated solution storage tank to the mixed dilution solution tank. Things.

According to the present invention, a concentrated aqueous solution of hypochlorous acid produced in a factory or the like is filled and transported in a tank or the like, and supplied to a concentrated solution storage tank of the diluting apparatus of the present invention installed in a medical facility or a food factory. can do. Then, the concentrated hypochlorous acid aqueous solution in the concentrated solution storage tank is supplied to the mixed dilute solution tank, and the dilution water is supplied from the outside to mix the two, thereby preparing a hypochlorous acid aqueous solution having a predetermined concentration. This aqueous solution can be taken out as required and used as disinfecting water.

In this case, the supply of the concentrated aqueous solution of hypochlorous acid to the tank for storing the concentrated solution or the supply of the aqueous solution of concentrated hypochlorous acid from the tank causes an increase or decrease in the upper space of the tank. In order to achieve a balance, it is necessary for air to enter and exit from outside air. On the other hand, chlorine gas generated from the concentrated aqueous solution of hypochlorous acid accumulates in the upper part of the concentrated solution storage tank,
By simply providing a vent to balance the pressure,
Chlorine gas leaks out from the vent, and the chlorine gas leaks until the partial pressure with the atmosphere is balanced, which is extremely dangerous and economically disadvantageous.

In the present invention, when the concentrated aqueous solution of hypochlorous acid is supplied to the concentrated solution storage tank, air containing chlorine gas generated and accumulated in the upper space of the concentrated solution storage tank is supplied to the mixed dilution solution tank. By introducing the chlorine gas into the dilution water, the chlorine gas can be redissolved in the dilution water to reduce the chlorine concentration and discharge it to the outside and the upper space of the mixed dilution solution tank. Further, the dilution water that has absorbed the chlorine gas is mixed with a concentrated aqueous solution of hypochlorous acid and used to prepare an aqueous solution of hypochlorous acid having a predetermined concentration.

When the concentrated hypochlorous acid aqueous solution in the concentrated solution storage tank is sent to the mixed and diluted solution tank, air in the upper space of the mixed and diluted solution tank or outside air is supplied to the concentrated solution storage tank through a ventilation pipe. Inhalation into aqueous chlorite solution.
In this case, since the cross-sectional area of the ventilation pipe is small and the specific gravity of the generated chlorine gas is large, the chlorine gas stays in the ventilation pipe except when the concentrated aqueous solution of hypochlorous acid is supplied, and is ventilated with the chlorine gas. Since the pipe is shaped like a lid, leakage of chlorine from the concentrated aqueous solution of hypochlorous acid is extremely small. Thus, the chlorine gas generated from the concentrated aqueous solution of hypochlorous acid can be prevented from leaking to the outside, and the concentration of the chlorine gas in the upper space of the mixed dilution solution tank can be reduced.

As described above, according to the present invention, when a concentrated aqueous solution of hypochlorous acid is supplied to the concentrated solution storage tank, the chlorine gas-containing air in the upper space of the concentrated solution storage tank is introduced into the dilution water to produce a chlorine solution. Is dissolved and absorbed, and when the concentrated hypochlorous acid aqueous solution in the concentrated solution storage tank is sent to the mixed dilution solution tank, the upper space of the mixed dilution solution tank or the outside air is passed through the ventilation pipe to concentrate the concentrated solution in the concentrated solution storage tank. By inhaling into the aqueous solution of hypochlorous acid, the chlorine gas naturally generated from the aqueous solution of concentrated hypochlorous acid is kept in the diluting device without leaking to the outside as much as possible. An aqueous chlorite solution can be prepared.

In a preferred aspect of the present invention, the aqueous hypochlorous acid solution adjusted to a predetermined concentration in the mixed dilution solution tank is put into a supply storage tank, and the predetermined concentration of hypochlorous acid is supplied from the supply storage tank. Remove the acid solution. According to this, it is possible to take out the aqueous solution of hypochlorous acid adjusted to a predetermined concentration more stably than in the case of directly taking out from the mixed dilution solution tank.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a concentrated hypochlorous acid aqueous solution diluting apparatus according to the present invention will be described with reference to the accompanying drawings. As shown in FIG.
Has a vertically long apparatus main body 11, which is provided with two partitions 12, 13, and a concentrated solution storage tank A for storing a concentrated aqueous solution of hypochlorous acid at the bottom, and a top at the top. A mixed dilute solution tank B for mixing a concentrated hypochlorous acid aqueous solution and dilution water to prepare a predetermined concentration of hypochlorous acid aqueous solution, and a predetermined concentration of hypochlorous acid prepared in the mixed dilute solution tank B in the middle A supply storage tank C for storing the acid aqueous solution is formed.

The concentrated solution storage tank A is provided with a concentrated solution introduction pipe 14 for introducing a concentrated hypochlorous acid aqueous solution carried by a tank truck, for example. It has a valve 15 that is opened when the aqueous chlorite solution 1 is introduced and closed at other times. Further, a concentrated solution supply pipe 16 for supplying the concentrated hypochlorous acid aqueous solution 1 in the concentrated solution storage tank A to the mixed and diluted solution tank B is attached, and the concentrated solution supply pipe 16 has a pump 17 and a valve 18. Is provided. Note that the concentrated solution supply pipe 16, the pump 17, the valve 18, and the like constitute a liquid sending means in the present invention.

The mixed dilution solution tank B is provided with a dilution water introduction tank D. The dilution water introduction tank D has a dilution water introduction pipe 20 having a valve 19 and a dilution water introduction pipe 21 connected thereto. 2 are being introduced. And
The introduced dilution water 2 is in the upper notch 2 of the dilution water introduction tank D.
2, and flows into the mixed diluting solution tank B.

The upper space A 'of the concentrated solution storage tank A
And a chlorine gas introduction pipe 23 for connecting the bottom of the dilution water introduction tank D with the chlorine gas introduction pipe 23. The chlorine gas introduction pipe 24 rises from the upper space A ′ of the concentrated solution storage tank A above the water surface of the dilution water introduction tank D, and then descends again through the filter 24 to the bottom of the dilution water introduction tank D. Connected. this is,
This is to prevent the water in the dilution water introduction tank D from flowing back into the concentrated solution storage tank A by the siphon principle. The filter 24 is made of a porous filter made of a corrosion-resistant material such as glass or ceramics, for example.
The air containing chlorine gas is made into a number of small bubbles and serves to pass through the water in the dilution water introduction tank D, thereby facilitating the dissolution of the chlorine gas in the dilution water. The chlorine gas and the air that have not been completely dissolved in the dilution water are discharged into the upper space B ′ of the mixed dilution solution tank B, and a part of the chlorine gas and the air are discharged through the exhaust duct 25 to the outside air.

When the concentration of chlorine in the air is low, for example, when the concentration level of the concentrated aqueous solution of hypochlorous acid is relatively low, the dilution water introduction tank D is not provided, and the dilution water introduction pipe 2 is not provided.
0 is directly connected to the upper portion of the mixed diluting solution tank B, and the chlorine gas introducing pipe 24 is directly connected to the bottom of the mixed diluting solution tank B so that air containing chlorine gas flowing out from the chlorine gas introducing pipe 24 is discharged. Alternatively, it may be directly aerated into the dilution water of the mixed dilution solution tank B.

The mixed diluting solution tank B is provided with a circulating pipe 31 for feeding the mixed solution at the bottom to the upper part. The circulating pipe 31 has a circulating pump 32 and a chlorine concentration and p
A sensor 33 for measuring H is attached. Further, the mixed diluting solution tank B is provided with a water level gauge 34 for detecting the upper and lower limits of the mixed solution. Then, the valve 18 of the concentrated solution supply pipe 16 and the valve 19 of the dilution water introduction pipe 20 are opened and closed by a control device (not shown) based on the chlorine concentration or the like measured by the sensor 33 or the water level detected by the water level gauge 34. The mixing ratio between the concentrated aqueous solution of hypochlorous acid and the dilution water is adjusted so as to obtain an aqueous solution of hypochlorous acid having a predetermined concentration, and the storage amount of the mixed solution is adjusted. I have.

The mixed dilution solution tank B and the supply storage tank C are
It is connected by a connecting pipe 27 having a valve 26. Further, an extraction pipe 28 for extracting the aqueous hypochlorous acid solution 3 diluted to a predetermined concentration is connected to the supply storage tank C, and by opening and closing a valve 29 provided on the extraction pipe 28,
The hypochlorous acid aqueous solution 3 can be taken out as needed. In addition, it is also possible to directly attach the extraction pipe 28 to the mixed dilution solution tank B without providing the supply storage tank C.

Further, the lower end is inserted through the supply storage tank C, the lower end is inserted into the concentrated aqueous solution of hypochlorous acid 1 in the concentrated solution storage tank A, and the upper end is disposed in the upper space B 'of the mixed and diluted solution tank B. Vent pipe 30 is provided.

Next, an embodiment of a method for diluting a concentrated aqueous solution of hypochlorous acid according to the present invention using the above-described diluting apparatus 10 will be described. As the concentrated aqueous solution of hypochlorous acid used in the present invention, a solution obtained by blowing chlorine gas into water and dissolving it, a solution of hypochlorite such as sodium hypochlorite dissolved in water, and sodium chloride are added. Aqueous solutions produced by various methods such as electrolyzed water can be used. The chlorine concentration of the concentrated aqueous solution of hypochlorous acid is 600 ppm or more, more preferably 600 to 200, in order to reduce transportation costs.
Preferably, it is 0 ppm. At such a high concentration, chlorine gas evaporates spontaneously during handling, which poses a danger. However, according to the dilution method of the present invention, a diluted solution can be produced safely.

The concentrated aqueous solution of hypochlorous acid is transported by, for example, a tank truck, and is fed into the concentrated solution storage tank A through the concentrated solution introduction pipe 14. For example, 600 ppm
The chlorine concentration in the upper air that equilibrates with the solution is about 20 ppm. Therefore, assuming that the volume of the concentrated solution storage tank A is 150 liters and 130 liters of the concentrated aqueous solution of hypochlorous acid is introduced therein, if the concentrated solution storage tank A
130 liters of air containing ppm chlorine gas will be extruded.

The chlorine gas-containing air passes through the chlorine gas introduction pipe 23 and further passes through the filter 24 to flow out into the bottom of the dilution water introduction tank D as a large number of small bubbles, and flows through the water in the dilution water introduction tank D. Dissolve in dilution water as it passes. The air in which the chlorine gas concentration has been reduced by dissolving and removing the chlorine gas is discharged from the upper part of the dilution water introduction tank D to the upper space B ′ of the mixed dilution solution tank B and the exhaust duct 25. The dilution water introduction tank D has a dilution water introduction pipe 20 and a pipe 21.
The dilution water such as tap water and well water is supplied through the through-hole, and the overflowed water is supplied to the mixed dilution solution tank B from the notch 22 on the upper part of the dilution water introduction tank D.

On the other hand, from the concentrated solution storage tank A, the pump 17
Thus, the concentrated aqueous solution of hypochlorous acid 1 is supplied to the mixed and diluted solution tank B through the concentrated solution supply pipe 16. At this time, the air in the upper space B ′ of the mixed and diluted solution tank B is sucked into the concentrated hypochlorous acid aqueous solution 1 through the ventilation pipe 30 and flows out to the upper space A ′ of the concentrated solution storage tank A through the solution. In addition, it is possible to prevent the inside of the tank from being depressurized and hindering the delivery of the concentrated aqueous solution of hypochlorous acid.

In the mixed diluting solution tank B, the mixed water is circulated through the circulating pipe 31 by the circulating pump 32 to form an aqueous solution of hypochlorous acid diluted to a predetermined concentration. At this time, the chlorine concentration,
The pH and the like are measured, and the level of the mixed water is measured by the water level gauge 34. Based on these measured values, the valve 18 of the concentrated solution supply pipe 16 and the valve 19 of the dilution water introduction pipe 20 are controlled to open and close to adjust the mixing ratio between the concentrated aqueous solution of hypochlorous acid and the dilution water and their flow rates. Thus, a predetermined amount of an aqueous solution of hypozinc acid having a desired predetermined concentration can be obtained.

The aqueous solution of hypochlorous acid diluted to a predetermined concentration in this manner is introduced into the supply storage tank C through the connecting pipe 27 and stored therein. Then, the required amount of the aqueous solution of hypochlorous acid in the supply storage tank C can be taken out of the take-out pipe 28 when disinfection or sterilization is required.

The concentrated hypochlorous acid aqueous solution 1 was diluted with diluted water 2
When the concentration of the aqueous solution of hypochlorous acid in the mixed dilution solution tank B and the supply storage tank C is adjusted to 60 ppm, the chlorine concentration in the upper space B 'of the mixed dilution solution tank B is 2 ppm. Hereinafter, the chlorine concentration in the upper space C ′ of the supply storage tank C can be suppressed to 2 ppm or less. Therefore, the air exhausted through the exhaust duct 25 contains only a chlorine concentration of 2 ppm or less, and when released into the atmosphere, the concentration is far below the safety standard of 1 ppm or less. Thus, the concentrated hypochlorous acid aqueous solution can be safely diluted and used.

[0029]

As described above, according to the present invention,
When supplying a concentrated aqueous solution of hypochlorous acid into the concentrated solution storage tank, the chlorine gas-containing air in the upper space of the concentrated solution storage tank is introduced into the dilution water to dissolve and absorb the chlorine, and the concentrated solution in the concentrated solution storage tank is concentrated. When sending the aqueous solution of hypochlorous acid to the mixed diluted solution tank, air in the upper space of the mixed diluted solution tank or the outside air should be sucked into the concentrated aqueous solution of hypochlorous acid in the concentrated solution storage tank through a ventilation pipe. Accordingly, it is possible to prepare an aqueous solution of hypochlorous acid diluted to a predetermined concentration while keeping chlorine gas naturally generated from the concentrated aqueous solution of hypochlorous acid in the diluting device without leaking as much as possible to the outside. Therefore, it is possible to transport concentrated hypochlorous acid aqueous solution produced in factories and the like to hospitals and food factories, etc., to safely dilute and use them at each site, contributing to hygiene measures in medical facilities and food factories. The big thing is.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a concentrated hypochlorous acid aqueous solution diluting apparatus according to the present invention.

[Explanation of symbols]

 A concentrated solution storage tank B mixed dilute solution tank C supply storage tank A ', B', C 'upper space D dilution water introduction tank 1 concentrated hypochlorous acid aqueous solution 2 dilution water 3 diluted hypochlorous acid aqueous solution 10 Dilution device 11 Device main body 12, 13 Partition part 14 Concentrated solution introduction pipe 16 Concentrated solution supply pipe 17 Pump 22 Upper notch 23 Chlorine gas introduction pipe 24 Filter 25 Exhaust duct 27 Connection pipe 28 Extraction pipe 30 Ventilation pipe 31 Circulation pipe 32 Circulation Pump 33 Sensor 34 Water level gauge (upper / lower limit sensor) 15, 18, 19, 26, 29 Valve

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01F 1/00 B01F 3/00-3/22

Claims (4)

(57) [Claims] 1. A concentrated aqueous solution of hypochlorous acid is supplied to a closed concentrated solution storage tank, and a predetermined amount of the aqueous solution of concentrated hypochlorous acid is supplied from the concentrated solution storage tank to a mixed and diluted solution tank. After preparing a concentrated aqueous solution of hypochlorous acid by mixing a concentrated aqueous solution of hypochlorous acid with dilution water in a solution tank,
A method for diluting a concentrated aqueous solution of hypochlorous acid, which is configured to take out the diluted aqueous solution of hypochlorous acid, wherein when the aqueous solution of concentrated hypochlorous acid is introduced into the concentrated solution storage tank, The chlorine-containing air generated and accumulated in the upper space of the tank is released to the outside and the upper space of the mixed dilution solution tank through the water in which the dilution water is stored, thereby dissolving and absorbing the chlorine in the dilution water and being harmless. Along with
When supplying a concentrated aqueous solution of hypochlorous acid from the concentrated solution storage tank to the mixed dilution solution tank, in order to eliminate the decompression in the concentrated solution storage tank caused thereby, the upper space of the mixed dilution solution tank or Characterized in that outside air is introduced into the concentrated aqueous solution of hypochlorous acid in the concentrated solution storage tank through a ventilation pipe to equalize the pressure of the concentrated solution storage tank. Dilution method. 2. A hypochlorous acid aqueous solution adjusted to a predetermined concentration in the mixed dilution solution tank is supplied to a supply storage tank, and the predetermined concentration hypochlorous acid aqueous solution is taken out from the supply storage tank. 2. The method for diluting a concentrated aqueous solution of hypochlorous acid according to 1. 3. A concentrated solution storage tank for storing a concentrated aqueous solution of hypochlorous acid, and a concentrated aqueous solution of concentrated hypochlorous acid supplied from the concentrated solution storage tank and dilution water supplied from the outside are mixed to a predetermined concentration. A mixed dilution solution tank for preparing an aqueous solution of hypochlorous acid, and air containing chlorine gas generated and retained in the upper space of the concentrated solution storage tank, chlorine gas introduced into the dilution water supplied to the mixed dilution solution tank An introduction pipe, one end of which is inserted into the concentrated aqueous solution of hypochlorous acid in the concentrated solution storage tank, and the other end of which is disposed in the upper space or outside of the mixed and diluted solution tank, and the concentrated solution storage tank A diluting device for supplying a concentrated aqueous solution of hypochlorous acid to the mixed and diluted solution tank. 4. A supply storage tank connected to the mixed dilution solution tank is provided, and a predetermined concentration of hypochlorous acid aqueous solution prepared in the mixed dilution solution tank is taken out through the supply storage tank. The concentrated hypochlorous acid aqueous solution diluting device according to claim 3, which is provided.