Production method of chlorous acid water

Abstract

To provide a production method of chlorous acid water in which safety in production and production cost are considerably improved.SOLUTION: A production method of chlorous acid water includes mixing hydrogen peroxide water into hypochlorous acid water which is produced by adding particular treated water to hypochlorous acid powder and allowing the resultant to spontaneously react to produce chlorous acid water.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a novel method for industrially mass-producing chlorous acid solution at low cost. [Background technology]

[0002] Compared with hypochlorous acid water and sodium hypochlorite, hypochlorous acid water is not said to have a high reactivity as a disinfectant, but it has a mild reactivity, a highly selective effect, and a long durability. For this reason, it can selectively exert a slow and sustained bactericidal effect on lipid membranes and specific amino acids, even in dirty environments with a large amount of organic matter, where previous chlorine oxide-based chemicals have had difficulty. In addition, because its bactericidal effect against bacteria and fungi and its inactivating effect against viruses are safer than hypochlorous acid water, various studies are being conducted on its use as a disinfectant for raw materials for processed foods.

[0003] The following Patent Documents 1 and 2 disclose and propose methods for industrially producing chlorous acid water. That is, Patent Document 1 is characterized in that an aqueous solution of sodium chlorate is reacted with sulfuric acid to generate chloric acid, and hydrogen peroxide is added to the chlorine acid to generate chlorous acid water. In addition, Patent Document 2 is characterized in that a process for producing a chlorous acid solution is added to a process for obtaining a chlorate or an aqueous solution thereof by electrolyzing a salt, and a process for producing an aqueous solution containing chlorous acid by reducing the chlorate or the aqueous solution thereof. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5201555 [Patent Document 2] JP 2022-121439 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the production method according to Patent Document 1 requires careful attention during production since highly acidic sulfuric acid with a pH value maintained at 2.3 to 3.4 is used. Furthermore, the production method disclosed in Patent Document 2 has a problem in that an electrolysis device is required since a method of electrolyzing sodium chloride is used. In response to this, the present invention aims to provide a novel and inexpensive method for producing chlorous acid water that does not use strong sulfuric acid, which is a powerful chemical, and does not use electrolysis. [Means for solving the problem]

[0006] The method for producing chlorous acid water according to the present invention is characterized in that chlorous acid water is produced by mixing hypochlorous acid water with hydrogen peroxide water. The hypochlorous acid water used in this case is made by adding hypochlorous acid powder to mineral water with metal ions dissolved therein, rather than using pure or purified water. Effect of the Invention

[0007] The method for producing chlorous acid water according to the present invention does not use strong sulfuric acid, which is a poisonous substance, and therefore safety during production is significantly improved. Furthermore, since no electrolysis method is used, no equipment for electrolysis is required, which makes it possible to reduce the production cost significantly. [Brief description of the drawings]

[0008] [Figure 1] 1 is a table showing analytical test results in the analytical test report. [Diagram 2] This is a table showing the change in concentration of hypochlorous acid water after it was left to stand for several months at the same concentration as that used in the analysis test results table in Figure 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the examples, hypochlorous acid and hydrogen peroxide were mixed in the same container to obtain chlorous acid water by natural reaction. The chemical reaction equation at this time is as follows: HClO + 2H2O2→ HClO2+ H2O + H2↑ + O2↑ Hypochlorous acid (HClO) and hydrogen peroxide (HO 2) When the above were mixed, hydrogen gas (H2) and oxygen gas (O2) were generated, so the mixture was left to stand until gas generation stopped (approximately 24 hours). No harmful chlorine was produced and the solution was odorless. Moreover, the produced chlorous acid water was colorless.

[0010] Unlike hypochlorous acid water, the molecular active species of chlorous acid water do not change depending on the pH of the aqueous solution. Chlorous acid (HClO2), the main active ingredient in hypochlorous acid water, exists in a dissociated state (H + ClO2 - ), and the active molecular species of this chlorous acid is called the chlorine peroxide radical (ClOO·), which is a molecular type bactericidal material. In addition, this chlorine peroxide radical has a lower thermodynamic energy than the gas compound chlorine dioxide (ClO2), and therefore exists for a longer period in aqueous solution. In addition, unlike chlorine radicals and hydroxyl radicals, chlorine peroxide radicals always interact with water molecules in an aqueous solution, and therefore exist as a thermodynamically longer-lived radical. By receiving hydrated electrons in an aqueous solution, they are converted into dissociated chlorous acid, and this series of reactions is called a cycle reaction.

[0011] In the production method of the present invention, the hypochlorous acid water used is prepared by dissolving powdered hypochlorous acid in specific treated water. Here, the specific treated water is not preferably pure water or purified water, but is preferably mineral water with metal ions dissolved therein, although ordinary tap water may also be used. Although the present inventor has not been able to perform a correct theoretical analysis, the chlorous acid water produced using pure water is loosened by the bond between hydrogen and chlorine due to the radical bond in pure water, and each of them evaporates as hydrogen gas and chlorine gas, so the amount of chlorous acid is reduced.However, in contrast, in the case of using mineral water or tap water, because there are metal ions in the aqueous solution, the bond between hydrogen and chlorine is loosened and does not easily separate, and it is believed that the stable state is maintained.

[0012] In other words, when mineral water or tap water is used as the treated water, the floating ions in the hypochlorous acid water react with the metal ions in the aqueous solution and disappear, which is thought to improve the stability of the hypochlorous acid water.

[0013] In the method for producing chlorous acid water according to the present invention, since sulfuric acid is not used, the safety during production is significantly improved. In addition, since the raw materials, hypochlorous acid and hydrogen peroxide water, are commercially available as industrial raw materials, the raw material cost is reduced, and since no electrolysis device is used, the equipment cost is also significantly reduced.

[0014] The chlorous acid water produced in this manner can be used as a sterilizing or disinfecting agent in daily life by diluting it appropriately, and can also be used as a food additive. EXAMPLES

[0015] As an experimental example, 50cc of hypochlorous acid water (concentration 2.4%) was mixed with 100cc of hydrogen peroxide water (concentration 3.0%) and allowed to react naturally, and after 24 hours, 150cc of hypochlorous acid water was obtained. The concentration was 1.4%.

[0016] The aqueous chlorous acid solution produced according to the method for producing chlorous acid water according to the present invention was analyzed by the Japan Food Research Center, a general incorporated foundation, and the analytical test results shown in FIG. 1 were obtained. In addition, the hypochlorous acid water thus produced, with a concentration equivalent to 1.4%, was left to sit for three months and the change in concentration was measured by the Japan Food Research Center, a general incorporated foundation. It was confirmed that the concentration had risen to 1.9% (Figure 2).

[0017] From these results, it was found that the concentration of the chlorous acid water produced by the present invention did not decrease even when left to stand, and in fact the concentration increased. If the concentration were to decrease when left to stand, the hypochlorous acid water produced would not be considered stable because it would change into other substances. However, even if the increase in concentration is presumed to be the result of water evaporating, the amount of solution has not decreased significantly, so it has been confirmed that the solution has a stable effect.

Claims

1. A method for producing chlorous acid water, comprising mixing hypochlorous acid water with hydrogen peroxide water to produce chlorous acid water.

2. In claim 1, The method for producing chlorous acid water, wherein the hypochlorous acid water is produced by adding specific treated water to hypochlorous acid powder.

3. In claim 1, The method for producing chlorous acid water, wherein the specific treated water is mineral water having metal ions dissolved therein.

4. In claim 1, 2 or 3, A method for producing chlorous acid water, characterized in that the chlorous acid water and the hydrogen peroxide water are mixed in the same container and produced by a natural reaction.

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