JP2012115749A - Electrolytic apparatus for making hypochlorous acid water, and method for making hypochlorous acid water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrolytic apparatus for making hypochlorous acid water suitable for sterilization and not low in pH, and a method for making hypochlorous acid water.SOLUTION: The electrolytic apparatus is constituted of an electrolytic tank 1 for receiving the supply of dilute hydrochloric acid from the lower part thereof, the anode plate 2a and cathode plate 2b provided in the electrolytic tank 1 in opposed relationship and having opposed inner surfaces and the outer surfaces on the sides opposite to the inner surfaces enabling the contact with dilute hydrochloric acid and a current quantity adjusting device 11 for adjusting the electric current to both electrode plates 2a and 2b so that the whole of dilute hydrochloric acid supplied from the lower part of the electrolytic tank 1 is electrolyzed by both electrode plates 2a and 2b to make hypochlorous acid water to thereby allow the same to flow out from the upper part of the electrolytic tank 1.

Description

  The present invention relates to an electrolyzer for producing hypochlorous acid water effective as sterilizing water and a method for producing hypochlorous acid water.

  As a conventional hypochlorous acid electrolyzer, as shown in FIG. 4, a small amount of sodium chloride and hydrochloric acid are added to an electrolytic cell c having an anode plate a and a cathode plate b arranged in parallel with each other on the inner wall. Electrolyte containing electrolytic solution is sent, electrolyzed in the electrolytic cell c, and the produced hypochlorous acid and diluted hydrochloric acid are diluted by adding water in the mixing vessel d to obtain hypochlorous acid water. Is known (see Patent Document 1).

JP-A-9-122651

  However, such a conventional electrolyzer usually cannot electrolyze all of the dilute hydrochloric acid supplied into the electrolytic cell c, so that the pH of the hypochlorous acid water produced by the dilute hydrochloric acid not electrolyzed is low. There was a problem that water with high hardness containing calcium and the like was required for neutralization of this hypochlorous acid water.

  An object of the present invention is to solve these problems and to provide an electrolyzer for generating hypochlorous acid water and a method for generating hypochlorous acid water capable of electrolyzing all of dilute hydrochloric acid supplied into the electrolytic cell. To do.

  In order to achieve the above-mentioned object, the first invention relates to an electrolyzer for generating hypochlorous acid water, an electrolyzer to which dilute hydrochloric acid is supplied from the lower part, an inner surface opposed to and provided in the electrolyzer, and its An anode plate and a cathode plate that can be contacted with dilute hydrochloric acid on the outer surface on the opposite side, and the dilute hydrochloric acid supplied from the lower part by electrolysis of all of the dilute hydrochloric acid by these electrode plates to generate hypochlorous acid water, and the upper part of the electrolytic cell The second invention relates to a method for producing hypochlorous acid water, and an inner surface facing the same, and a method for adjusting the amount of current to both the electrode plates so that hypochlorous acid water flows out. Dilute hydrochloric acid is supplied from the lower part of the electrolytic cell to the electrolytic cell having an anode plate and a cathode plate that can be electrolyzed on the outer surface on the opposite side, and all of the diluted hydrochloric acid supplied into the electrolytic cell is electrolyzed to hypochlorite. Generate acid water, adjust the current to both electrode plates And from the top of the solution tank to flow out of the hypochlorous acid solution.

  According to the present invention, since there is no undecomposed dilute hydrochloric acid among the dilute hydrochloric acid supplied into the electrolytic cell, the pH of the produced hypochlorous acid water is in the vicinity of neutrality, and the hypochlorous acid water is neutralized. It does not require water with high hardness including calcium.

  Moreover, since dilute hydrochloric acid supplied not only to the inner surfaces of both electrode plates but also to the outer surface contributes to electrolysis, the current efficiency can be increased.

It is a pipe line figure of Example 1 of the electrolyzer for hypochlorous acid water production | generation of this invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. It is a vertical front view of Example 2 of the electrolytic cell of the electrolyzer for hypochlorous acid water production | generation of this invention. It is a pipeline diagram of the conventional electrolyzer for hypochlorous acid water production | generation.

  The example of the form for carrying out the present invention is shown below.

  Example 1 of an electrolyzer for generating hypochlorous acid water according to the present invention will be described with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes an electrolytic cell. The electrolytic cell 1 is provided with a rectangular anode plate 2a and a rectangular cathode plate 2b facing each other. The anode plate 2a and the cathode The plate 2b is formed to be exposed so as to be electrolyzed on the opposing inner surface and the opposite outer surface.

  Reference numeral 3 denotes a dilute hydrochloric acid tank. The dilute hydrochloric acid tank 3 stores, for example, about 3% dilute hydrochloric acid, and a water pipe 4 is provided between the dilute hydrochloric acid tank 3 and the bottom 1a which is the lower part of the electrolytic cell 1. In addition, a dilute hydrochloric acid supply pump 5 is interposed in the water supply pipe 4, and the dilute hydrochloric acid tank 3 is supplied into the electrolytic cell 1 by driving the dilute hydrochloric acid supply pump 5.

  Reference numeral 6 denotes a storage tank, and 7 denotes a circulation pipe. The circulation pipe 7 is connected to the storage tank 6 at an inflow pipe portion 7a and an outflow pipe portion 7b, and a circulation pump is provided at an intermediate portion of the circulation pipe 7 8, the water in the storage tank 6 flows from the inflow pipe portion 7a and flows in the circulation pipe 7 by driving the circulation pump 8, and flows into the storage tank 6 from the outflow pipe 7b. The water or hypochlorous acid water was circulated in the circulation pipe 7.

  Reference numeral 9 denotes a mixing pipe line. The mixing pipe line 9 is formed so as to penetrate through the lid portion 1b which is the upper part of the electrolytic cell 1, and the outflow end of the mixing pipe line 9 is the circulation pipe line. 7 is connected to the intermediate portion 7 and the hypochlorous acid water generated in the electrolytic cell 1 and flowing from the mixing pipe 9 flows in the circulation pipe 7 at the mixing point A that is connected and connected. It mixed with water or hypochlorous acid water.

  Reference numeral 10 denotes a discharge pipe of the storage tank 6.

  Reference numeral 11 denotes a current amount adjusting device connected to the anode plate 2a and the cathode plate 2b via a lead wire. The current amount adjusting device 11 is configured so that all of the diluted hydrochloric acid supplied into the electrolytic cell 1 is electrolyzed. A current amount that is electrolyzed based on the following reaction formula 1 is supplied to both the electrode plates 2a and 2b from the lower part of the tank 1 to the upper part and flowing into the mixing pipe 9.

(Equation 1)
2HCl + H ₂ O → HCl + HClO + H ₂

  The storage tank 6 has a discharge port (not shown) for discharging the hydrogen gas generated in the electrolytic cell 1 to the outside.

  Next, a method for producing hypochlorous acid water by the electrolytic apparatus of Example 1 and its effect will be described.

  The dilute hydrochloric acid supply pump 5 is driven while adjusting its discharge flow rate to supply dilute hydrochloric acid in the dilute hydrochloric acid tank 3 little by little from the bottom 1a into the electrolytic cell 1, and the current amount adjusting device 11 allows the both electrode plates 2a to be supplied. , 2b is energized.

  That is, the supplied dilute hydrochloric acid gradually rises from the lower part to the upper part of the electrolytic cell 1, and the dilute hydrochloric acid in the rise is electrolyzed by the electrode plates 2a and 2b to generate hypochlorous acid water.

  At this time, since the electrolysis is performed not only on the opposed inner surfaces of the electrode plates 2a and 2b but also on the outer surface, the electrolysis is efficiently performed. Further, the electric quantity adjusting device 11 adjusts the currents of the two electrode plates 2a and 2b so that all of the supplied dilute hydrochloric acid is electrolyzed until it flows into the mixing conduit 9.

  On the other hand, the circulation pump 8 is driven to circulate and flow the water in the storage tank 6 through the circulation line 7.

  Then, the hypochlorous acid water flowing in the mixing pipe 9 is mixed into the water or hypochlorous acid water flowing in the circulation pipe 7 at the mixing point A, and the hypochlorous acid water is stored in the storage tank. 6 is stored.

  At the initial time point, the hypochlorous acid water in the storage tank 6 has a low concentration, but the hypochlorous acid from the electrolytic cell 1 is repeatedly recycled while the hypochlorous acid water repeatedly circulates in the circulation pipe 7. Water is mixed and gradually becomes hypochlorous acid water with high concentration. The operation is continued until the hypochlorous acid water in the storage tank 6 has a desired concentration.

  In this way, dilute hydrochloric acid is supplied to the electrolytic cell 1 by the supply pump 5 little by little, and hypochlorous acid water generated by electrolyzing all of the supplied diluted hydrochloric acid in the electrolytic cell 1 is circulated through the circulation path 7. Since there is no undecomposed dilute hydrochloric acid among the supplied dilute hydrochloric acid, the pH of the generated hypochlorous acid water is near neutral, and calcium etc. for neutralization of hypochlorous acid water Does not require water with high hardness.

  In addition, since the pH of the generated hypochlorous acid water is near neutral, when the indoor air is sterilized by releasing the hypochlorous acid water into the room, etc., corrosion to iron and other metals in the room The influence of can be suppressed.

  In addition, since the pH of the generated hypochlorous acid water is near neutral, the hypochlorous acid water is stable for a long time and suppresses generation of chlorine gas due to decomposition of the hypochlorous acid water. be able to.

  Further, a small current is sufficient for the adjustment current by the current amount adjusting device 11.

  In addition, it is possible to provide an electrolyzer that has a simple structure, is easy to handle, is safe, can be used for a long time, and is maintenance-free.

In addition, when the supplied dilute hydrochloric acid is electrolyzed, for example, an equivalent amount of 30 ppm of HCl (hydrochloric acid) is generated with respect to 30 ppm of HClO (hypochlorous acid) as shown in the reaction formula 1. This amount of hydrochloric acid is neutralized by Ca ⁺⁺ , Na ^+, etc. contained in the supplied dilute hydrochloric acid, so that even if the pH of hypochlorous acid water is lowered, the amount of generated hypochlorous acid is very small. There is no influence that the pH of water deviates from near neutrality.

  Even when the supplied dilute hydrochloric acid is not electrolyzed until all of the supplied dilute hydrochloric acid flows into the mixing pipe 9, and even when a part of the supplied dilute hydrochloric acid is electrolyzed, the generated hypochlorous acid water is mixed. When flowing into the pipe 9, the amount of current is adjusted so that the pH of the hypochlorous acid water is in the range of about 4.0 to 6.5, preferably about 5.0 to 6.5. The adjusting device 11 may adjust the current to both the electrode plates 2a and 2b to be energized.

  If the pH of the hypochlorous acid water is within a neutral range of 5.0 to 6.5, the hypochlorous acid water is in a most stable state, and 90% or more of the hypochlorous acid water is present. Since it is maintained without being decomposed, the most efficient sterilizing effect can be obtained when hypochlorous acid water is used as sterilizing water.

  Example 2 of the electrolyzer for generating hypochlorous acid water of the present invention will be described with reference to FIG.

  In the second embodiment, a plurality of through holes 12 are provided on the plate surfaces of the anode plate 2a and the cathode plate 2b of the electrolytic cell 1 of the first embodiment.

  In Example 2, dilute hydrochloric acid in the electrolytic cell 1 travels through the through-holes 12 to the inner and outer surfaces of both electrode plates 2a and 2b, and the outer surfaces of both electrode plates also contribute to electrolysis effectively. Thus, the current efficiency can be increased twice or more as compared with the conventional electrolytic cell in which only the inner surfaces of both electrode plates can be in contact with dilute hydrochloric acid.

  The shape of the through hole 12 may be any shape such as a circular shape or a slit shape.

  Further, if the through holes are provided in the electrode plate having a size of 4 cm × 16 cm or more, the current efficiency is particularly improved.

  The electrolytic device for hypochlorous acid production and the method for producing hypochlorous acid water of the present invention are used in food factories, poultry farms, milking farms, farms, medical and nursing facilities, restaurants, and the like.

DESCRIPTION OF SYMBOLS 1 Electrolysis tank 2a Anode plate 2b Cathode plate 3 Dilute hydrochloric acid tank 5 Dilute hydrochloric acid supply pump 7 Circulation line 11 Current amount adjusting device 12 Through-hole

Claims (5)

  An electrolytic cell to which dilute hydrochloric acid is supplied from the lower part, an anode plate and a cathode plate that are provided facing the inside of the electrolyzer and are capable of contacting dilute hydrochloric acid on the opposing inner surface and the outer surface on the opposite side, The amount of current for adjusting the currents to the two electrode plates so as to electrolyze all the dilute hydrochloric acid supplied from the lower part to generate hypochlorous acid water and to flow out the hypochlorous acid water from the upper part of the electrolytic cell An electrolyzer for generating hypochlorous acid water, comprising an adjusting device.   An electrolytic cell to which dilute hydrochloric acid is supplied from the lower part, an anode plate and a cathode plate that are provided facing the inside of the electrolyzer and are capable of contacting dilute hydrochloric acid on the opposing inner surface and the outer surface on the opposite side, A part of dilute hydrochloric acid supplied from the lower part is electrolyzed to generate hypochlorous acid water, and the pH of the hypochlorous acid water flowing out from the upper part of the electrolytic cell is within a range of 5.0 to 6.5. An electrolyzer for generating hypochlorous acid water, comprising: a current amount adjusting device that adjusts the current to both the electrode plates so that   The electrolytic device for hypochlorous acid water generation according to claim 1 or 2, wherein a plurality of through holes are formed on the plate surfaces of the anode plate and the cathode plate, respectively.   Dilute hydrochloric acid is supplied from the lower part of the electrolytic cell to an electrolytic cell having an anode plate and a cathode plate that can be electrolyzed on the opposite inner surface and the outer surface on the opposite side, and all of the diluted hydrochloric acid supplied into the electrolytic cell is electrically A method for generating hypochlorous acid water, wherein hypochlorous acid water is generated by decomposition and the current to both electrode plates is adjusted to flow out the hypochlorous acid water from the upper part of the electrolytic cell.   Dilute hydrochloric acid is supplied from the lower part of the electrolytic cell to an electrolytic cell having an anode plate and a cathode plate that can be electrolyzed on the opposing inner surface and the opposite outer surface, and a part of the diluted hydrochloric acid supplied into the electrolytic cell is supplied to the electrolytic cell. Electrolyze to produce hypochlorous acid water, adjust the current to both electrode plates, and flow out hypochlorous acid water in the range of pH 5.0 to 6.5 from the upper part of the electrolytic cell A method for producing hypochlorous acid water.

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