TW202402662A - Device for producing acidic hypochlorous acid water - Google Patents

Abstract

One aspect of the present invention prevents the occurrence of a situation in which a sodium hypochlorite aqueous solution and a strong acid aqueous solution are simultaneously supplied to a column due to a problem such as an erroneous operation or malfunction in the production of an acidic hypochlorous acid water by a device that carries out an operation of producing weak acidic hypochlorous acid water from a sodium hypochlorite aqueous solution through an ion exchange column method and then regenerating the column with a strong acid aqueous solution, the operation being carried out by operating each opening/closing valve and pump, etc. on the basis of a signal transmitted based on program control. Another aspect of the present invention is characterized by equipping a production device with a control mechanism that detects, for example, the type of an open/close command signal that is sent to an opening/closing valve of a pipe that supplies the sodium hypochlorite aqueous solution and to an opening/closing valve of a pipe that supplies the strong acid aqueous solution, or the presence of fluid inside both pipes, and if a state is entered in which said opening/closing valves can simultaneously become "open", the control mechanism forcibly closes one or both of the opening/closing valves regardless of the type of signal sent by the program.

Description

Acidic hypochlorous acid water production equipment

The present invention relates to a device that uses an aqueous solution of hypochlorite as a raw material to efficiently produce acidic hypochlorous acid water, especially weakly acidic hypochlorous acid water.

Hypochlorites, such as aqueous solutions of sodium hypochlorite, are used as bactericides in a wide range of fields. The bactericidal effect is known to vary significantly depending on the pH of its solution.

Even if the sodium hypochlorite aqueous solution is diluted to about 50 to 200 ppm, which is usually used as a bactericide, the pH value only drops to about 8.5 to 9.5. Under such alkaline conditions, most of them will be in the form of hypochlorite ions (OCl ^- ), and the bactericidal effect will be low. In addition, sodium hypochlorite cannot be used directly on humans and livestock because its high pH value can strongly irritate the skin. In order to improve the sterilization effect, the pH value needs to be adjusted to the acidic side, and it is necessary to change it to the state of hypochlorous acid (HClO) (in this case, even if it is obtained by dissolving hypochlorite, it is also called hypochlorous acid). Chloric acid water (or aqueous solution)). The bactericidal effect of hypochlorous acid is said to be about 80 times that of hypochlorite ions.

From the perspective of the main existence form of hypochlorous acid (HClO), hypochlorous acid water systems with a pH value of about 2.5 to 6.5 have attracted attention and are being used in various fields such as medicine, dentistry, agriculture, and food processing. Used as a fungicide. Then, in recent years, it has been used for sterilization in public facilities such as long-term care facilities, educational facilities, commercial facilities, and general households, and its consumption has been increasing year by year.

As one of the methods for producing such weakly acidic hypochlorous acid water, a method and apparatus have been proposed in which a hypochlorite aqueous solution is passed through a container (column) filled with a weakly acidic cation exchange resin. A weakly acidic hypochlorous acid aqueous solution is produced (see, for example, Patent Document 1).

In addition, ion exchange columns are used in various fields such as purification of water and pH adjustment as mentioned above. Here, of course, an ion exchange column cannot perform ion exchange indefinitely. When a certain degree of ion exchange is performed (reaching the through-flow exchange capacity), the ion exchange resin should be replaced with a new one, and the used ion exchange resin must be Discard or recycle. Regeneration of weakly acidic cation exchange resins usually involves flowing an acidic aqueous solution, and from the viewpoint of regeneration efficiency, strong acidic aqueous solutions such as hydrochloric acid are commonly used.

Regarding the regeneration of the weakly acidic cation exchange resin, there is a method by taking out the entire column from the device and flowing the strong acid aqueous solution in another place. However, if the inconvenience of taking out and transporting is taken into consideration, the following method is adopted: The method is efficient: in addition to supplying the chemical liquid (liquid that can be treated by ion exchange) to the piping of the manufacturing device equipped with the ion exchange column, a pipeline for supplying the strong acid aqueous solution is also installed, and by using the chemical liquid It flows alternately with the acid aqueous solution to repeatedly perform ion exchange treatment and regeneration.

[Prior technical literature] [Patent Document] [Patent Document 1] International Publication No. 2011/136091

[Problem to be solved by the invention] However, when the sodium hypochlorite aqueous solution is made strongly acidic, molecular chlorine (Cl ₂ ) will be generated, and if a large amount is generated, it may be released into the air as a gas. sex. Therefore, when processing large amounts of sodium hypochlorite and strong acid simultaneously in one device, there is a high risk of mistakenly supplying the sodium hypochlorite aqueous solution and the strong acid aqueous solution to the same column at the same time.

Therefore, an object of the present invention is to provide an apparatus capable of producing acidic hypochlorous acid water from a sodium hypochlorite aqueous solution using an ion exchange method safely and with high productivity.

[a means to solve problems] In order to solve the above-mentioned problems, the following manufacturing apparatus is provided.

That is, the present invention is a device for producing acidic hypochlorous acid water, which is characterized by having: a sodium hypochlorite aqueous solution storage tank (A); a strong acid aqueous solution storage tank (B); an ion exchange column (C) filled with weak acid Cation exchange resin; recovery liquid storage tank (D), which stores the chemical liquid after ion exchange treatment; chemical liquid supply pipe ( _EA ), which supplies the chemical liquid from the sodium hypochlorite aqueous solution storage tank (A) to the ion exchange Column (C); On-off valve (F _A ), which is installed in the middle of the chemical solution supply pipe ( _EA ); Acid supply pipe ( _EB ), which supplies the strong acid aqueous solution from the strong acid aqueous solution storage tank ( B) is supplied to the ion exchange column (C); an on-off valve (F _B ) is installed in the middle of the acid supply pipe (E _B ); a processed chemical liquid transfer pipe (G) is used to transfer The chemical liquid after ion exchange treatment is transported from the ion exchange column (C) to the recovery liquid storage tank (D); and the waste liquid piping (H) is used to flow the waste liquid discharged from the ion exchange column (C); The on-off valve (F _A ) and the on-off valve (F _B ) are valves that are switched on and off based on the transmitted signal under program control; they also have a control mechanism that is independent of the program control and forces the on-off valve ( F _A ) and the on-off valve (F _B ) will not become "open" at the same time.

[Effects of the invention] If the production device of the present invention is used, the risk of erroneously generating chlorine gas can be significantly reduced, and acidic hypochlorous acid water can be produced efficiently and with good productivity.

Hereinafter, the present invention will be described with reference to FIG. 1 .

The present invention relates to a device for producing acidic hypochlorous acid water from a sodium hypochlorite aqueous solution by a so-called ion exchange method. Therefore, the manufacturing apparatus of the present invention is equipped with: a sodium hypochlorite aqueous solution storage tank (A) for storing the sodium hypochlorite aqueous solution (medical solution) used as the raw material; and an ion exchange column (C) filled with sodium hypochlorite aqueous solution for transferring sodium ions. A weakly acidic cation exchange resin exchanged into hydrogen ions; and a chemical solution supply pipe ( _EA ) used to transport the sodium hypochlorite aqueous solution to the ion exchange column (C).

The sodium hypochlorite aqueous solution to be treated is not particularly limited, and a known one can be used; although a commercially available one can be used depending on the orientation of various uses, if the production efficiency is taken into consideration, it is preferable to use one with a high concentration. Specifically, the effective chlorine concentration is preferably 0.5 mass% or more, more preferably 0.8 mass% or more, and still more preferably 1.0 mass% or more. On the other hand, considering stability, it is preferably 2.0 mass% or less. In addition, although it depends on the use of the acidic hypochlorous acid water after production, the content of sodium chloride is preferably low, that is, the concentration of sodium chloride is preferably less than 1/3 of the effective chlorine concentration [mass %] ( Generally called low-salt sodium hypochlorite), preferably less than 1/6 (generally called special-grade sodium hypochlorite for tap water).

The weakly acidic cation exchange resin filled in the ion exchange column can be any known one without particular limitation, but is preferably one having a carboxyl group as an ion exchange group. In addition, the weakly acidic cation exchange resin may be any type such as porous type, gel type, macroporous type, etc. The weakly acidic cation exchange resin may be filled with acid type (also called hydrogen type, proton type, etc.). A weakly acidic cation exchange resin is used as the cation exchange resin in order to prevent the pH value of the acidic hypochlorous acid water obtained from the treatment (liquid circulation) from becoming too low.

If the sodium hypochlorite aqueous solution is passed through an ion exchange column, some of the sodium ions in the sodium hypochlorite aqueous solution will be exchanged for hydrogen ions by the weakly acidic cation exchange resin filled in the column, making the liquid acidic.

The conditions such as the rate at which the sodium hypochlorite aqueous solution is supplied to the ion exchange column (C) are such that the liquid that passes through the ion exchange column (C) and is discharged becomes weakly acidic (pH value is about 2.5 to 6.5, preferably about 2.7 to 3.4) method to set it appropriately. For example, if the effective chlorine concentration of the sodium hypochlorite aqueous solution used as a raw material is about 0.5 to 2.0 mass % as mentioned above, the space velocity SV [1/h] can be set to about 1 to 20. The supply speed of the sodium hypochlorite aqueous solution can be set by a conventional method, such as control using a quantitative pump installed in the middle of the chemical supply pipe ( _EA ). In addition, the space velocity SV is calculated as SV=R/V, assuming that the filling layer volume of the weakly acidic cation exchange resin is V [L] and the liquid flow rate of the treatment liquid is R [L/h]. In addition, the effective chlorine concentration of sodium hypochlorite and acidic hypochlorous acid refers to the chlorine concentration equivalent to the oxidizing power of hypochlorous acid, and is expressed as the mass concentration of chlorine molecules equivalent to the molar amount of hypochlorous acid contained. In the present invention, the effective chlorine concentration refers to the value measured by iodine titration.

As described above, the acidic hypochlorous acid water (treatment chemical solution) obtained by subjecting the sodium hypochlorite aqueous solution to ion exchange treatment is transported to the recovered liquid storage tank (D) through the treated chemical solution transport pipe (G) and stored.

In addition, if the efficiency of the aforementioned ion exchange treatment is taken into consideration, although the sodium hypochlorite aqueous solution is preferably one with a high concentration, when the chemical solution after the ion exchange treatment is stored (saved), the storage stability will be better, so the treatment is completed The preferred medicinal solution is one with a low concentration. Therefore, in the manufacturing apparatus of the present invention, the chemical solution transport pipe (G) after processing merges with the water supply pipe (not shown) for supplying water (ion exchange water, distilled water, ultrapure water, etc.). It is also a better aspect to dilute the acidic hypochlorous acid water to a desired ratio and simultaneously transport it to the recovery liquid storage tank (D).

As the above-mentioned sodium hypochlorite aqueous solution flows, the proportion of the salt form in the weakly acidic cation exchange resin in the ion exchange column (C) gradually increases, so the pH value of the discharged liquid from the column increases. Then, when the pH value of the liquid to be treated discharged from the column exceeds a predetermined value (reaches a breakthrough point), the flow of the sodium hypochlorite aqueous solution is stopped. By installing a pH meter (J) near the column outlet of the treated chemical solution delivery pipe (G), the pH value can be easily grasped.

In addition to stopping the liquid delivery pump, the liquid flow is stopped when the breakthrough point is reached by closing the on-off valve ( _FA ) provided in the middle of the chemical supply pipe ( _EA ).

The weakly acidic cation exchange resin in the ion exchange column (C) can be regenerated through general methods. That is, by flowing a strong acid aqueous solution such as hydrochloric acid through the column, the cation exchange group in the salt form can be restored to the acid form.

In order to perform the regeneration process without removing the column, the manufacturing device of the present invention further includes a strong acid aqueous solution storage tank (B) and an acid supply pipe ( _EB ) with an on-off valve ( _FB ) in the middle. Moreover, in the aspect shown in the figure, the acid supply pipe ( _EB ) and the chemical solution supply pipe ( _EA ) merge in the middle to form one pipe and are connected to the ion exchange column (C). In other words, downstream of the converging point, one pipe serves both as the chemical supply pipe ( _EA ) and the acid supply pipe ( _EB ), but it may also be used as a completely independent system of pipes. Moreover, of course, when piping is combined, the converging part is provided downstream of each on-off valve ( _FA , _FB ).

In addition, in the ion exchange column (C) where the liquid flow of the sodium hypochlorite aqueous solution has just stopped, there is still a residual liquid of the sodium hypochlorite aqueous solution. Although it depends on the scale of the equipment, the amount of the residual liquid is not very large, so even if a strong acid aqueous solution is allowed to flow into it, the amount of molecular chlorine generated will not be significantly large. Therefore, even if it is done, it is usually not released into the air as gas, but is dissolved in a strong acid aqueous solution used for regeneration and discharged as it is. However, even if there is only a small amount of chlorine gas generated, in order to reduce this risk, it is better to use it to clean the ion exchange column (C) after the liquid flow of the sodium hypochlorite aqueous solution is stopped and before the liquid flow of the strong acid aqueous solution is carried out. The water inside flows through.

Therefore, in the manufacturing apparatus of the present invention, it is provided with a water supply pipe ( _EW ) provided with an on-off valve ( _FW ) in the middle and is capable of supplying water (liquid flow) to the ion exchange column (C). A better form of composition. In the aspect shown in the figure, the water supply pipe ( _EW ) joins the chemical solution supply pipe ( _EA ) and the acid supply pipe ( _EB ) in the middle to form one pipe and is connected to the ion exchange pipe. Column (C), but this can also be a stand-alone system. Moreover, when all three pipes are merged, it is more preferable to first merge one of the chemical supply pipe ( _EA ) or the acid supply pipe ( _EB ) with the water supply pipe ( _EW ), and Downstream, the remaining acid supply pipe ( _EB ) or chemical solution supply pipe ( _EA ) is merged. This will improve the cleaning effect of the water in the manifold piping.

Briefly describing the operation sequence of the above device, after closing the on-off valve (F A ) of the chemical supply pipe (E _{A )} and stopping the flow of the sodium hypochlorite aqueous solution, the on-off valve (F _W ) of the water supply pipe is opened and the flow of the sodium hypochlorite aqueous solution is stopped. The water flows and the inside of the ion exchange column (C) (and the inside of the piping) is washed with water. When cleaning is completed, close the on-off valve (F _W ), and then open the on-off valve (F _B ) of the acid supply pipe (E _B ) to allow the strong acid aqueous solution to flow through the ion exchange column (C) and carry out weakly acidic cations. Regeneration of exchange resin.

Although the ion exchange column (C) after the regeneration of the weakly acidic cation exchange resin is reused for the production of acidic hypochlorous acid water, for the same reason as mentioned above, it is preferably used for the liquid circulation of the sodium hypochlorite aqueous solution. Before that, wash the inside with water. That is, a step of closing the on-off valve ( _FB ) of the acid supply pipe (EB) and then opening the on-off valve ( _FW ) of _the water supply pipe to allow water to flow is also performed here. Then, after the water washing is completed, the on-off valve (F _W ) is closed, the on-off valve (F _A ) of the chemical supply pipe (E _A ) is opened, and the sodium hypochlorite aqueous solution is circulated in the ion exchange column (C) to perform acidic secondary treatment. Manufacturing of chloric acid water.

In addition, the completion timing of regeneration and water washing of the weakly acidic cation exchange resin can be easily grasped by monitoring the pH value of the liquid discharged from the ion exchange column (C).

In addition, it is necessary to discharge the liquid from the column as waste liquid during the regeneration of the weakly acidic cation exchange resin and the water washing before and after it, and prevent it from flowing into the recovery liquid storage tank (D). Therefore, a waste liquid pipe (H) for transporting waste liquid is also provided and is not connected to the recovered liquid storage tank (D). In addition, from a safety point of view, the piping structure is preferably such that the waste liquid can be divided into acid waste liquid (waste liquid from column regeneration and subsequent water washing) and hypochlorous acid waste liquid (pipeline waste liquid). Waste liquid from water washing before column regeneration) is discarded and flowed separately.

For example, in the aspect shown in Figure 1, there is provided an acid waste liquid pipe (H ₁ ) that is branched off from the processed chemical liquid transport pipe (G) connected to the outlet of the column, and when a strong acid aqueous solution is supplied to the ion The acidic waste liquid generated when the column (C) is exchanged and subsequently washed with water flows to the acid waste liquid piping (H ₁ ) side. Next, downstream of the bifurcated portion, there is a structure that branches off the sub-system waste liquid pipe (H ₂ ), so that the waste liquid during water washing after the supply of the sodium hypochlorite aqueous solution is stopped flows there. Of course, while the sodium hypochlorite aqueous solution is being supplied to the ion exchange column (C), the on-off valves on the acid waste liquid piping (H ₁ ) and sub-system waste liquid piping (H ₂ ) sides are closed, although the on-off valve (F) is opened. _G ) and transport the treated liquid (acidic hypochlorous acid water) to the recovery liquid storage tank (D). However, during the supply process, if the product is not suitable for the pH value, etc., it can be flowed to the sub-basin Connect to the waste liquid piping (H ₂ ) side and discard.

In the illustrated aspect, the switching of the flow path is performed by an on-off valve provided downstream of the bifurcation portion, but a method such as providing a flow path switching cock at the bifurcation portion may also be used.

Furthermore, pipes may be connected to direct waste liquid treatment equipment and each waste liquid may be processed there, or each waste liquid may be temporarily stored in a chemical drum or the like, and the chemical drum or the like may be transported to a facility equipped with a waste liquid treatment equipment. The waste liquid treatment method can be carried out by appropriately selecting a conventional method.

In addition, in the piping structure of FIG. 1 described above, up to each bifurcated portion, the following structure is also used: the processed chemical liquid transfer piping (G) for transporting the processed chemical liquid as a product to the recovery liquid storage tank (D). ); and waste liquid piping (H ₁ , H ₂ ) for transporting waste liquid. The present invention also includes an aspect in which one pipe is used in the middle part to serve a plurality of purposes and is then branched.

In the manufacturing device of the present invention, the opening and closing of the above-mentioned valves are not performed manually, but are performed under centralized program control. That is, programmable logic controller (PLC), software PLC, etc. (hereinafter referred to as "PLC, etc.") are used, and based on the information (signals) from each switch valve, pH meter, etc., the above-mentioned In order to change the order of the valve to the "open" state or the "closed" state, the "open" or "closed" command signal is sent to each on-off valve to perform the opening and closing of each on-off valve. That is, program control in the above-mentioned sequence is performed by a PLC or the like. In order to perform switching based on signals transmitted from a PLC or the like, each switching valve in the manufacturing device of the present invention may use a solenoid valve or a pneumatic valve.

Here, as mentioned above, when a large amount of strong acid is mixed with the sodium hypochlorite aqueous solution and the pH value of the solution becomes acidic less than about 1, the proportion of molecular chlorine will increase, and in some cases there will be a risk of generating chlorine gas. . Therefore, it is necessary to avoid supplying the sodium hypochlorite aqueous solution and the strong acid aqueous solution to the ion exchange column (C) at the same time. This would not be the case if the system were operated under sequence control that was correctly designed with this in mind.

However, it is not impossible that unexpected signals are transmitted to each switch valve due to erroneous operation of the PLC or the like, or virus infection when running the software PLC on a computer (PC).

Therefore, in the manufacturing apparatus of the present invention, even if such an error signal is transmitted to the switching valve, in order to prevent the sodium hypochlorite aqueous solution and the strong acid aqueous solution from being supplied to the ion exchange column at the same time, a control mechanism is further provided, which is independent. Under the control of the above-mentioned PLC and other programs, it is possible to forcibly close the on _{-off valve (F A and /} or F _B ).

Here, the meaning of "mandatory" means that regardless of the type of signal transmitted from a control program such as a PLC to the target on-off valve, the command of the above-mentioned independent control mechanism will be executed with priority. That is, even if the signal sent from the normal control program is "open", if the independent control mechanism commands "close", the on-off valve will be configured to become closed.

In addition, "the on-off valve (F _A ) and the on-off valve (F _B ) will not be in the "open" state at the same time" does not mean that both valves are not allowed to be in the open state instantaneously, but the time for such a state can be It is about 1 second or less (preferably about 0.5 seconds or less), and although it depends on the scale (the flow rate level of each chemical solution), even about 3 seconds is acceptable. As long as this amount of time is allowed, it is acceptable from the viewpoint of preventing the generation of the aforementioned chlorine gas, and has no substantial impact on the physical properties of the acidic hypochlorous acid water produced.

In addition, in the present invention, "closing" the on-off valve means not only changing the valve from the "open" state to the "closed" state, but also includes maintaining the original closed state.

Although the structure of the independently operated control mechanism is not particularly limited, the following two aspects are preferably used.

The first aspect is a control mechanism constructed in the following manner: It determines the type of signals sent from a control program such as a PLC to the on-off valve (F _A ) and the on-off valve (F _B ), and when detected, both sides become valves at the same time. When the signal is in the "open" state, one and/or both of the on-off valves are forcibly closed. In addition, outputting a signal that requires both parties to "open" the valve at the same time means that there is a high possibility of some kind of malfunction in the PLC, etc. Therefore, it is safer to close both on-off valves (or even stop the operation of the entire device), so it is safer. good.

This control mechanism can be constructed as a physically independent control mechanism from a PLC that controls normal operations, and if it is controlled by a software PLC that operates on a PC, etc., it can be constructed as software that operates in parallel within the same PC. Build.

More specifically, an example of a case where the control mechanism is configured as a physically independent control mechanism will be described. For example, in the case of a normally closed (NC, normally closed) type of switching valve that only opens when the signal line is applied, the wiring that transmits the switching signal of the switching valve (F _A ) is connected to the signal terminal of the relay. , and relay the wiring that transmits the switching signal of the switching valve (F _B ) to the b contact (breaking contact) of the aforementioned relay, then when the switching valve (F _A ) is in the open state, regardless of the signal from PLC, etc. status, the switch valve ( _FB ) will not open. Similarly, by connecting the wiring that transmits the switching signal of the switching valve (F _B ) to the signal terminal of another relay, and relaying the wiring that transmits the switching signal of the switching valve (F _A ) to the b terminal of the aforementioned relay. point, the action of the on-off valve (F _A ) can be restricted. In addition, the relay used here may be a contact relay such as an electromagnetic relay, or a contactless relay such as a MOSFET relay or a solid state relay.

The second aspect is a control mechanism constructed in the following manner: a detection device (I _A ) is installed downstream of the on-off valve (F _A ) in the chemical supply pipe (E _A ) and is capable of detecting the inside of the pipe. Whether there is fluid flow; the detection device ( _IB ) is installed downstream of the on-off valve ( _FB ) in the acid supply pipe ( _EB ), and can detect whether there is fluid flow in the pipe; in the detection device (I _A ) When the fluid is detected, the switching valve ( _FB ) is forcibly closed, and when the detection device ( _IB ) detects the fluid, the switching valve ( _FA ) is forcibly closed.

According to this aspect, it has nothing to do with the signal of the control program such as PLC, because it depends on whether the fluid actually flows in the pipe to close the on-off valve. Therefore, it can not only respond to the situation where an error signal is transmitted due to an erroneous operation of the PLC, but also It can cope with the situation of on-off valve failure, etc., and can also cope with the situation that although the correct "close" signal is sent, the flow path cannot actually be closed (pseudo "open" state); from this point of view, the safety level is higher than that of the above-mentioned A higher form. In addition, since the on-off valve of the pipe on the side where the detection device is installed may also malfunction, in this configuration, another pipe is forcibly closed instead of closing the pipes of the same system, so that it can be reliably ensured. Safety.

The detection device capable of detecting the presence or absence of fluid flow in the pipe is not particularly limited, and can be appropriately selected and used from conventional sensor types such as optical, electrical or physical detection, taking sensitivity, cost, etc. into consideration.

In addition, when a large amount of the strong acid aqueous solution used to regenerate the weakly acidic cation exchange resin is mixed into the recovery liquid storage tank (D), chlorine gas may be generated. In the manufacturing apparatus of the present invention, it is preferable to include a control mechanism for preventing such a situation. Specifically, the following control mechanism is provided: When there is a possibility that strong acid flows (or may flow) in the acid supply pipe ( _EB ) When necessary, the on-off valve (F _G ) provided in the pipe leading to the recovery liquid storage tank (D) is forcibly closed.

If this control mechanism is expressed more specifically, for example, when it is detected that both the on-off valve (F _B ) and the on-off valve (F _G ) installed in the acid supply pipe (E _B ) are turned on and off at the same time, the valve " The control mechanism of the on-off valve (F _G ) is forcibly closed when receiving a signal of "open"state; or, when the above-mentioned detection device (I _B ) installed in the acid supply pipe (E _B ) detects fluid, the control mechanism is forcibly closed. The control mechanism of the on-off valve (F _G ), etc.

Here, the control mechanism of the forced on/off valve (F _A ) and the on/off valve (F _B ) can be called a first control mechanism, and both the forced on/off valve (F _B ) and (F _G ) or the forced on/off valve (F B The control mechanism of _G ) is called the second control mechanism. These second control mechanisms can be constructed in the same manner as the first control mechanism that forces the on-off valve (F _A ) and the on-off valve ( _FB ) not to become "open" at the same time.

Furthermore, in the accompanying drawings, control panels such as PLCs are not shown, nor are devices that transmit/receive signals between them and switching valves, pH meters, detection devices, etc.

In addition, in the manufacturing equipment of the present invention, when the above-mentioned control mechanism is activated and any on-off valve is forcibly closed against a signal from a PLC or the like, it is preferable that the equipment operator and the equipment manager are notified of the incident. system (also not shown).

Furthermore, in the above description of the manufacturing apparatus of the present invention, a single (one) ion exchange column (C) is used, but when the number of ion exchange columns (C) is two or more In the case of the number of units, it can be appropriately arranged and applied according to its piping structure and operation sequence.

The manufacturing apparatus of the present invention flows the highly corrosive hypochlorous acid aqueous solution and the strong acid liquid as described above. Therefore, the contact surfaces of each storage tank, pipes, on-off valves, pipe columns and other components are (The inner surface) is preferably made of resin, and in particular, materials with high durability against hypochlorous acid such as vinyl chloride, polypropylene, polyethylene, AS resin, ABS resin, PFA, and PTFE are preferred. Of course, in order to improve the strength, it can also have a shell made of fiberglass reinforced plastic (FRP) or metal. In particular, sufficient strength can be obtained even if the piping is made of resin. However, in order to obtain the strength of each storage tank and pipe column, each storage tank and pipe column system can be formed of structural materials such as FRP, metal, tempered glass, etc. The inner surface of something is coated with resin.

In addition, the acidic hypochlorous acid water to be produced using the production apparatus of the present invention has good storage stability without mixing metal (ions). From this point of view, it is preferable that the inner surface of the manufacturing device is also made of resin. Furthermore, in the water supply pipe (E _w ), the upstream portion of the on-off valve (F _w ) is not in contact with sodium hypochlorite or the strong acid aqueous solution. However, from the viewpoint of preventing the above-mentioned metal from being mixed in, the inner surface is preferably made of resin. system.

(Summary) As can be clearly understood from the above description, the apparatus for producing acidic hypochlorous acid water according to aspect 1 of the present invention is characterized by having: a sodium hypochlorite aqueous solution storage tank (A); a strong acid aqueous solution storage tank (B); ions Exchange column (C), which is filled with weakly acidic cation exchange resin; Recovery liquid storage tank (D), which stores the chemical liquid after ion exchange treatment; Medical liquid supply piping ( _EA ), which supplies the chemical liquid The sodium hypochlorite aqueous solution storage tank (A) is supplied to the ion exchange column (C); an on-off valve (F _A ), which is installed in the middle of the chemical solution supply pipe ( _EA ); an acid supply pipe ( _EB ) , which supplies the strong acid aqueous solution from the strong acid aqueous solution storage tank (B) to the ion exchange column (C); the switching valve (F _B ), which is installed in the middle of the acid supply pipe (E _B ); the process is completed The chemical liquid transport piping (G) is used to transport the chemical liquid after ion exchange treatment from the ion exchange column (C) to the recovery liquid storage tank (D); and the waste liquid piping (H) is used to transport the chemical liquid from the ion exchange column (C) to the recovery liquid storage tank (D). The waste liquid discharged from the ion exchange column (C) flows; the on-off valve (F _A ) and the on-off valve (F _B ) are valves that switch based on the transmitted signal under program control; and also have a control mechanism, which It is controlled independently of the program and forces the on-off valve (F _A ) and on-off valve ( _FB ) not to be "open" at the same time.

Regarding the characteristic of the acidic hypochlorous acid water production device according to the second aspect of the present invention, in the above-mentioned aspect 1, the control mechanism that operates independently of the program control is the following mechanism: the determination is transmitted to the switch The signal type of the valve ( _FA ) and the on-off valve ( _FB ), and when the signal that causes both valves to "open" at the same time is detected, one and/or both on-off valves are forcibly closed.

Regarding the characteristics of the acidic hypochlorous acid water production device according to the third aspect of the present invention, in the above-mentioned aspect 1, the control mechanism that operates independently of the program control is the following mechanism, which is equipped with: a detection device ( I _A ), which is installed downstream of the on-off valve (F _A ) in the chemical supply pipe (EA _A ), and can detect whether there is fluid flow in the pipe; the detection device (I _B ), which is installed in the acid The supply pipe ( _EB ) is downstream of the on-off valve ( _FB ), and can detect whether there is fluid flow in the pipe; when the detection device (I _A ) detects fluid, the on-off valve ( _FB ) is forcibly closed, and during detection The device (I _B ) forcibly closes the switching valve (F _A ) when fluid is detected.

Regarding the characteristics of the acidic hypochlorous acid water production device according to the fourth aspect of the present invention, in the above-mentioned aspect 2, it is further equipped with: an on-off valve (F _G ) that is provided to transport the chemical solution after the treatment. in the middle of the piping (G); and also equipped with: a control mechanism that forcibly activates the on-off valve (F _B ) and the on-off valve (F _{G ) when a signal is detected that causes both the on-off valve (F B ) and the on-off valve (F G} ) to "open" at the same time. Close the switching valve (F _G ).

Regarding the characteristics of the acidic hypochlorous acid water production apparatus according to the fifth aspect of the present invention, in the above-mentioned aspect 3, it is further equipped with: an on-off valve (F _G ) which is provided to transport the chemical solution after the treatment. in the middle of the piping (G); and also equipped with: a control mechanism that forcibly closes the on-off valve (F _G ) when the detection device (I _B ) detects fluid.

A: Sodium hypochlorite aqueous solution storage tank B: Strong acid aqueous solution storage tank C: Ion exchange column D: Recovery liquid storage tank E _A : Chemical solution supply piping E _B : Acid supply piping E _W : Water supply piping F _A , F _B , F _W , F _G : On/off valve G: Treatment completed chemical liquid delivery piping H ₁ : Acid waste liquid piping H ₂ : Subacid waste liquid piping I _A , I _B : Detection device J: pH meter

FIG. 1 is a schematic diagram showing an embodiment of the manufacturing apparatus of the present invention.

A: Sodium hypochlorite aqueous solution storage tank

B: Strong acid aqueous solution storage tank

C: Ion exchange column

D: Recovery liquid storage tank

E _A :Chemical solution supply piping

E _B :Acid supply piping

E _W :Water supply piping

F _A , F _B , F _W , F _G : On-off valve

G: The processing of liquid transportation and piping is completed

H ₁ : Acid waste liquid piping

H ₂ : Sub-Asian waste liquid piping

I _A , I _B : detection device

J: pH meter

Claims (5)

A device for manufacturing acidic hypochlorous acid water, characterized by having: a sodium hypochlorite aqueous solution storage tank (A); a strong acid aqueous solution storage tank (B); an ion exchange column (C) filled with weakly acidic cation exchange resin; recovery Liquid storage tank (D), which stores the chemical liquid after ion exchange treatment; Chemical liquid supply pipe ( _EA ), which supplies the chemical liquid from the sodium hypochlorite aqueous solution storage tank (A) to the ion exchange column (C) ; On-off valve (F _A ), which is installed in the middle of the chemical solution supply pipe (E _A ); Acid supply pipe ( _EB ), which supplies the strong acid aqueous solution from the strong acid aqueous solution storage tank (B) to the ion Exchange column (C); On-off valve ( _FB ), which is installed in the middle of the acid supply pipe ( _EB ); Processed chemical liquid delivery pipe (G), which is used to transfer the ion-exchange treated The chemical liquid is transported from the ion exchange column (C) to the recovery liquid storage tank (D); and the waste liquid piping (H) is used to flow the waste liquid discharged from the ion exchange column (C); the switch valve (F _A ) and the on-off valve (F _B ) are valves that switch based on the transmitted signal under program control; they also have a control mechanism that is independent of the program control and forces the on-off valve (F _A ) and the switch The valve ( _FB ) does not become "open" at the same time. The device for producing acidic hypochlorous acid water according to claim 1, wherein the control mechanism that operates independently of the program control is the following mechanism: the judgment is transmitted to the on-off valve (F _A ) and the on-off valve (F _B ) of the signal type, and when detecting the signal that causes both valves to "open" at the same time, one and/or both of the on-off valves are forcibly closed. The device for producing acidic hypochlorous acid water according to claim 1, wherein the control mechanism that operates independently of the program control is the following mechanism, which is provided with: a detection device (I _A ) that is provided in the chemical solution The on-off valve (F _A ) in the supply pipe (E _A ) is downstream and can detect whether there is fluid flow in the pipe; the detection device (I _B ) is provided on the on-off valve (F _A ) in the acid supply pipe (EB) F _B ) downstream, and can detect whether there is fluid flow in the pipe; when the detection device (I _A ) detects fluid, the on-off valve (FB ₎ is forcibly closed, and when the detection device (I _B ) detects fluid, the switch valve (F B ) is forcibly closed. Close the switching valve (F _A ). The device for producing acidic hypochlorous acid water according to Claim 2, further comprising: an on-off valve (F _G ) installed in the middle of the treatment-completed chemical liquid delivery pipe (G); and further comprising: The control mechanism forcibly closes the on-off valve (F _G ) when detecting a signal that causes both the on-off valve ( _FB ) and the on-off valve (F _G ) to "open" the valves at the same time. The device for producing acidic hypochlorous acid water according to claim 3, further comprising: an on-off valve (F _G ) which is installed in the middle of the treatment-completed chemical liquid delivery pipe (G); and further comprising: A control mechanism that forcibly closes the switching valve (F _G ) when the detection device (I _B ) detects fluid.