WO2011136091A1 - 弱酸性次亜塩素酸、並びにその製造装置および製造方法 - Google Patents
弱酸性次亜塩素酸、並びにその製造装置および製造方法 Download PDFInfo
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- WO2011136091A1 WO2011136091A1 PCT/JP2011/059641 JP2011059641W WO2011136091A1 WO 2011136091 A1 WO2011136091 A1 WO 2011136091A1 JP 2011059641 W JP2011059641 W JP 2011059641W WO 2011136091 A1 WO2011136091 A1 WO 2011136091A1
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- weakly acidic
- hypochlorous acid
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- ion exchanger
- acidic ion
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/04—Hypochlorous acid
- C01B11/06—Hypochlorites
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B11/00—Oxides or oxyacids of halogens; Salts thereof
- C01B11/04—Hypochlorous acid
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
Definitions
- the present invention relates to an apparatus and a method for producing a hypochlorous acid aqueous solution. More particularly, the present invention relates to an apparatus and method for producing an aqueous hypochlorous acid solution without using an acid and substantially without generating chlorine gas.
- hypochlorous acid has been known to have a bactericidal action. For this reason, hypochlorous acid solutions are used in a wide variety of fields, and have also been used for sterilization of tap water and foods.
- hypochlorous acid The bactericidal effect of hypochlorous acid is the molecular hypochlorous acid produced by the combination of hypochlorite ion and hydrogen ion by the reaction of hypochlorite such as sodium hypochlorite, water and acid. Exerted by chloric acid.
- hypochlorous acid When using hypochlorous acid for sterilization purposes, it is generally known that the state of non-dissociated molecular hypochlorous acid has the highest bactericidal effect.
- a hypochlorite solution produced from sodium hypochlorite or the like significantly changes the bactericidal effect depending on the pH of the solution.
- hypochlorous acid exists as hypochlorite ion, and the bactericidal effect is low.
- the bactericidal effect is low and further chlorine gas is generated.
- hypochlorous acid is considered to have a high abundance of molecular hypochlorous acid when its pH is about 3.5 to 6.5.
- the sodium hypochlorite aqueous solution is produced as an alkaline solution.
- an aqueous sodium hypochlorite solution is diluted to 50 to 100 ppm, which is a concentration generally used as sterilizing water, the pH is lowered only to about 8.5 to 9.5. For this reason, when using hypochlorous acid for sterilization purposes, it is necessary to lower the pH to a pH with a high sterilization effect.
- the electrolysis method requires an apparatus equipped with an electrolytic cell, and the maintenance cost is expensive. Moreover, an electrode is required and cost is high. Furthermore, the electrolytic process can produce only a low concentration of weakly acidic hypochlorous acid.
- the two-component method is a method of adjusting the pH to the acidic side by mixing an aqueous sodium hypochlorite solution with hydrochloric acid. Since this method adjusts the pH with an acid such as hydrochloric acid, it includes a step of mixing sodium hypochlorite and an acid, which causes a safety problem.
- Patent Document 1 and Patent Document 2 disclose a method using an ion exchange resin as a method not using hydrochloric acid.
- Patent Document 1 instead of hydrochloric acid, a solution in which pH is lowered by ion-exchange of water containing a cation such as a mineral with a hydrogen-substituted ion exchange resin is used to form a sodium hypochlorite aqueous solution.
- a method for lowering the pH value is disclosed.
- the pH is lowered to a value at which chlorine gas is generated, and generation of chlorine gas is inevitable.
- Patent Document 2 discloses a method for producing hypochlorous acid for the purpose of producing hypochlorous acid containing no salts.
- a sodium hypochlorite solution is treated with a hydrogen-substituted ion exchange resin to replace metal ions with hydrogen ions.
- the obtained solution is treated with an anion exchange resin to replace chlorine ions with hydroxide ions. Therefore, it is necessary to treat with two types of ion exchange resins, and this method is also troublesome, and it is difficult to adjust the pH of hypochlorous acid.
- Hypochlorous acid has a safe and powerful sterilizing effect without generating chlorine gas, especially when the pH is set to about 3.5-7. Therefore, an apparatus and a method for easily and safely producing weakly acidic hypochlorous acid having such a pH is desired.
- an object of the present invention is to provide an apparatus and a method for producing a hypochlorous acid aqueous solution without using an acid and substantially without generating chlorine gas.
- the present invention uses a weakly acidic ion exchanger having a buffering action at a pH higher than that at which chlorine gas is generated, thereby reducing the pH to a value at which chlorine gas is generated without using an acid such as hydrochloric acid.
- a method for producing a hypochlorous acid aqueous solution is provided.
- the present invention is a method for producing weakly acidic hypochlorous acid, and includes a step of treating a hypochlorite solution with a weakly acidic ion exchanger having a buffering action at a pH higher than that at which chlorine gas is generated.
- a manufacturing method is provided.
- the present invention also provides the above production method, wherein the hypochlorite is sodium hypochlorite, potassium hypochlorite or calcium hypochlorite.
- the present invention also provides the above production method, wherein the pH of the weakly acidic hypochlorous acid after treatment with the weakly acidic ion exchanger is pH 3.5 to pH 7.5.
- the present invention provides the above production method, wherein the hypochlorite solution is 500 ppm or more.
- the present invention provides an apparatus for producing weakly acidic hypochlorous acid, comprising a weakly acidic ion exchanger having a buffering action at a pH higher than that at which chlorine gas is generated.
- the present invention is the above weak acidic hypochlorous acid production apparatus, further comprising: a hypochlorite solution diluting device; and a container filled with a weak acidic ion exchanger.
- An apparatus for producing hypochlorous acid is provided.
- the present invention also provides a sterilizer comprising a weakly acidic ion exchanger having a buffering action at a pH higher than that at which chlorine gas is generated and a spraying means for spraying weakly acidic hypochlorous acid.
- the present invention provides a container for the production of weakly acidic hypochlorous acid containing calcium hypochlorite and a weakly acidic ion exchanger having a buffering action at a pH higher than that at which chlorine gas is generated.
- the present invention provides weakly acidic hypochlorous acid produced by the above production method.
- a weakly acidic hypochlorous acid aqueous solution without using an acid and without lowering the pH to a pH or less that generates chlorine gas.
- a highly concentrated hypochlorous acid aqueous solution can be produced.
- weak acidic hypochlorous acid can be produced without lowering the pH to below the pH at which chlorine gas is generated, as in the conventional production method.
- Weakly acidic hypochlorous acid with less bleaching effect than hypochlorous acid can be produced.
- the whitening phenomenon by the mineral component originating in a hypochlorite solution can be prevented like the conventional manufacturing apparatus.
- FIG. 1 which shows an example of the container containing a calcium hypochlorite and a weakly acidic ion exchanger. Schematic which shows an example of the apparatus of this invention. Schematic which shows an example of the apparatus of this invention.
- the present inventors treated weakly acidic hypochlorous acid having a pH of about 3.5 to 7.5 without substantially generating chlorine gas by treating an alkaline sodium hypochlorite solution with a weakly acidic ion exchanger. It has been found that an aqueous solution can be obtained.
- the term “above the pH at which chlorine gas is generated” refers to a pH range in which chlorine gas is not substantially generated when the pH of the hypochlorite solution is lowered.
- the weak acid includes a pH range in which chlorine gas is not substantially generated when the pH of the alkaline hypochlorite solution is lowered.
- “weakly acidic” refers to a weakly acidic to neutral range, and a pH in the range of about 3.5 to 7.5, particularly in the range of 4.0 to 7.0.
- the fact that chlorine gas is not substantially generated means that chlorine gas is not substantially generated at a level that is dangerous for the living body, and that chlorine bubbles are generated from the solution when the pH of the hypochlorite solution is lowered.
- the method for producing weakly acidic hypochlorous acid of the present invention includes a step of treating a hypochlorite solution with a weakly acidic ion exchanger.
- a hypochlorite solution refers to sodium hypochlorite (NaClO), potassium hypochlorite (KClO) and calcium hypochlorite (Ca) as generally recognized by those skilled in the art.
- a solution containing any hypochlorous acid salt such as (ClO) 2 ).
- hypochlorite commercially available materials and materials produced by methods well known to those skilled in the art can be used.
- the solution can also be in any solution such as water.
- hypochlorite solution can also be a solution in a buffer.
- the hypochlorite solution can contain optional additives.
- the hypochlorite solution can include any weak acid salt such as sodium bicarbonate and calcium lactate. By including such an additive, the hypochlorite solution can be adjusted to a pH with higher bactericidal activity.
- hypochlorite solution a solution having an arbitrary concentration can be used.
- a commercially available 12% sodium hypochlorite solution can be diluted and used at concentrations of 10-120000 ppm or higher, such as 100, 200, 500, 1000, 10000 and 120,000 ppm.
- weakly acidic hypochlorous acid having a concentration that cannot be produced by a conventional method such as 10000 ppm can be produced. It is also possible to directly produce weakly acidic hypochlorous acid having a concentration of 50 to 1000 ppm, which is the concentration actually used for sterilization purposes.
- the hypochlorite solution can also be prepared when the production method of the present invention is carried out. Not only a salt produced as a solution such as sodium hypochlorite, but also a solid salt can be used.
- a hypochlorite solution can be prepared by adding a solid such as calcium hypochlorite to water.
- a weakly acidic ion exchanger having a buffering action at a pH higher than that at which chlorine gas is generated is used.
- the weakly acidic ion exchanger can be, for example, an ion exchanger having a carboxylic acid group (—COOH) as an exchange group.
- weakly acidic ion exchangers can exchange bases such as NaOH and salts of weak acids such as NaHCO 3 .
- any weakly acidic ion exchanger known to those skilled in the art can be used as the weakly acidic ion exchanger.
- the weak acid ion exchanger can be a weak acid ion exchange resin such as a methacrylic acid weak acid cation exchange resin and an acrylic acid weak acid cation exchange resin.
- a weak acid ion exchange resin such as Amberlite IRC-76 (Organo Corporation).
- Amberlite IRC-76 Organo Corporation
- any material having an ion exchange action and a pH buffer action such as ceramic and natural ore can be used as the weak acid ion exchanger.
- the weakly acidic ion exchanger used in the present invention has a buffering action, for example, in a weakly acidic to neutral range, in a pH range of about 3.5 to 7.5, particularly in a range of 4.0 to 7.0. Therefore, according to the method of the present invention, the pH of the solution after the treatment with the weakly acidic ion exchanger is in the range of pH 3.5 to 7.5, for example, pH 4.0 to 6.5. For this reason, there is no possibility of generating chlorine gas, and the bactericidal effect is high.
- the ion exchanger with such a buffering action absorbs excessive hydrogen ions while releasing adsorbed sodium ions and calcium ions, so that the pH partially generates chlorine gas.
- the weakly acidic ion exchanger used in the present invention does not temporarily or partially fall below the pH at which chlorine gas is generated when the pH of the hypochlorite solution is lowered.
- an acid such as hydrochloric acid as in the conventional method of producing hypochlorous acid
- the acid of the pH that generates chlorine gas and the hypochlorite solution are mixed. Therefore, it is considered that the pH of the solution is temporarily or locally lowered to a pH at which chlorine gas is generated during the mixing process to generate chlorine gas.
- chlorine gas is not generated by using a weakly acidic ion exchanger as in the present invention.
- weakly acidic ion exchangers used in the present invention will not affect neutral salts.
- the weakly acidic ion exchanger can be used in an arbitrary amount.
- a person skilled in the art will be able to adjust the amount of weakly acidic ion exchanger depending on the concentration and amount of weakly acidic hypochlorous acid produced.
- the method of the present invention does not cause the pH of the weakly acidic hypochlorous acid produced to be too low even if an excess amount of weakly acidic ion exchanger is used to treat the hypochlorite solution. Is very safe.
- the pH can be kept constant even when an excessive amount of weakly acidic ion exchanger is used.
- the weakly acidic ion exchanger is not removed and left in the weakly acidic hypochlorous acid solution for a long time.
- the pH can be kept stable over time.
- the weakly acidic ion exchanger also has the property of adsorbing mineral components such as calcium and magnesium in the solution. Therefore, after reducing the pH of the hypochlorite solution by the method of the present invention, the weakly acidic ion exchanger is not removed but left in the weakly acidic hypochlorous acid solution. It is possible to prevent whitening derived from the mineral components generated in the surface.
- a weakly acidic ion exchange is performed in the device.
- the body can be provided.
- the spraying device including the weakly acidic ion exchanger can prevent whitening in the device derived from calcium and magnesium contained in water and whitening due to atomized water droplets.
- the pH of the diluted hypochlorite solution may change depending on the pH of the diluted water. Absent.
- the pH of the diluted hypochlorite solution can be maintained at an appropriate pH by the pH buffering action of the weak acid ion exchanger. Therefore, by using a spraying device equipped with such a weakly acidic ion exchanger, the pH of the diluted hypochlorite solution can be maintained at a pH with a high bactericidal effect.
- the strength of adsorption of various ions by the weakly acidic cation exchange resin is generally higher in selectivity as the valence is higher, but is particularly characterized by very high selectivity for H ions.
- a chemical such as hydrochloric acid or sulfuric acid aqueous solution.
- it is easy to regenerate when repeatedly used, and it is possible to regenerate with a drug amount slightly higher than the theoretical chemical equivalent.
- bleaching with sodium hypochlorite is considered to be due to chlorination reaction with dissolved chlorine.
- the bleaching power is considered to be in the order of dissolved chlorine> sodium hypochlorite> hypochlorous acid.
- weakly acidic hypochlorous acid can be produced without substantially generating dissolved chlorine, it is possible to obtain weakly acidic hypochlorous acid having a low bleaching effect.
- a dissolved chlorine is not produced
- the odor will be very strong, but according to the method of the present invention, weakly acidic hypochlorous acid can be produced without substantially producing dissolved chlorine. There is little odor.
- the treatment of the hypochlorite solution with the weakly acidic ion exchanger can be performed by an arbitrary method. For example, it can be processed by passing a hypochlorite solution through a column packed with a weakly acidic ion exchanger. Moreover, it can also process by a batch method by throwing a weakly acidic ion exchanger in the container containing a hypochlorite solution. Moreover, a weakly acidic ion exchanger can be filled in an arbitrary bag like a tea bag and immersed in a hypochlorite solution. According to the method of the present invention, weakly acidic hypochlorous acid having a high bactericidal effect can be easily obtained simply by treating a hypochlorite solution with a weakly acidic ion exchanger.
- FIG. 1 shows an example of a container containing calcium hypochlorite and a weakly acidic ion exchanger in advance.
- the upper part of FIG. 1 shows a schematic diagram when calcium hypochlorite and a weakly acidic ion exchanger are placed in a nonwoven fabric.
- the lower part of FIG. 1 is a schematic diagram when the opening of the figure shown in the upper part is closed.
- Calcium hypochlorite and a weakly acidic ion exchanger are sealed inside the nonwoven fabric. Any material can be used for the container. By including calcium hypochlorite and a weakly acidic ion exchanger in a water-permeable container such as a non-woven fabric, weakly acidic hypochlorous acid can be obtained simply by immersing in water.
- the container does not have to be a material that allows water to pass therethrough. If the shape allows water to enter the container, it is possible to obtain weakly acidic hypochlorous acid by contacting with calcium hypochlorite and the weakly acidic ion exchanger simply by immersing in water.
- calcium hypochlorite and the weakly acidic ion exchanger can be taken out of the container and put into water. Bags containing both solid hypochlorous acid and weakly acidic ion exchangers such as calcium hypochlorite only contain solid calcium hypochlorite and weakly acidic ion exchangers, so use Previously, it can be manufactured and stored as a solid rather than a solution. Solid calcium hypochlorite can be used in any shape. For example, granules and powders can be used.
- the production apparatus of the present invention includes a weakly acidic ion exchanger.
- the manufacturing apparatus of the present invention can be an apparatus as shown in FIG. 2, for example.
- the apparatus of FIG. 2 comprises a diluting device 5 for storing and diluting the hypochlorite solution.
- the dilution device 5 is connected to an ion exchanger packed container 6 such as a column packed with an ion exchange resin.
- the diluting device 5 includes a pump for introducing the hypochlorite solution of the diluting device into the ion exchanger filled container 6 filled with the weakly acidic ion exchanger, and the ion exchanger filled container through the pump. Connected to 6.
- a hypochlorite solution is introduced from the diluter to the ion exchange column by the pump, and treated with a weakly acidic ion exchanger to obtain weakly acidic hypochlorous acid.
- the manufacturing apparatus of the present invention can be an apparatus as shown in FIG. 3, for example.
- the flow path 7 connected to the container 6 filled with the weakly acidic ion exchanger from the diluter of the hypochlorite solution and the container 6 filled with the weakly acidic ion exchanger It has a channel 8 that is not connected.
- it can comprise so that the flow volume of each flow path can be adjusted. For example, by providing a throttle valve or an open / close valve in the flow path 7 and the flow path 8, the mixing ratio of the solutions passing through the respective flow paths can be adjusted.
- the weakly acidic hypochlorous acid solution after ion exchange and the hypochlorite solution before ion exchange can be mixed in arbitrary quantity.
- a neutral pH 7 solution when the weakly acidic hypochlorous acid solution after ion exchange is pH 5, an appropriate amount of sodium hypochlorite solution (eg, pH 12) before ion exchange is used.
- a pH 6 solution when producing a neutral pH 7 solution, when the weakly acidic hypochlorous acid solution after ion exchange is pH 5, an appropriate amount of sodium hypochlorite solution (eg, pH 12) before ion exchange is used.
- a pH 6 solution when producing a neutral pH 7 solution, when the weakly acidic hypochlorous acid solution after ion exchange is pH 5, an appropriate amount of sodium hypochlorite solution (eg, pH 12) before ion exchange is used.
- the production apparatus of the present invention can further include a spraying means 9 for spraying the weakly acidic hypochlorous acid that has passed through the weakly acidic ion exchanger column.
- a spraying means 9 for spraying the weakly acidic hypochlorous acid that has passed through the weakly acidic ion exchanger column.
- An apparatus provided with such a spraying means can be incorporated into equipment such as an air purifier and an air conditioner, and can be used as a sterilizer.
- the spray device any device known to those skilled in the art can be used.
- a spraying device using ultrasonic waves can be used.
- the weakly acidic ion exchanger has a property of adsorbing mineral components such as calcium and magnesium in the solution. Therefore, in the apparatus of the present invention, whitening derived from mineral components generated in the apparatus can be prevented by bringing the weakly acidic hypochlorous acid solution and the weakly acidic ion exchanger into contact with each other.
- the weakly acidic hypochlorous acid solution is atomized and circulated inside the spraying means 9.
- the spray means 9 with a weakly acidic ion exchanger, it is possible to adsorb the peak component in the weakly acidic hypochlorous acid solution. For this reason, the whitening by the mineral component inside an apparatus can be prevented, and failure of an apparatus etc. can be prevented.
- the pH of the weakly acidic hypochlorous acid solution can be stabilized.
- weakly acidic hypochlorous acid of the present invention As described above, according to the method and apparatus for producing weakly acidic hypochlorous acid of the present invention, it is possible to easily obtain weakly acidic hypochlorous acid without lowering the pH of the solution to a range where chlorine gas is generated. Can do. Moreover, according to the manufacturing method and manufacturing apparatus of weakly acidic hypochlorous acid of this invention, as shown in the following Example, weakly acidic hypochlorous acid with a high concentration of 500 ppm or more can be obtained. Furthermore, the weakly acidic hypochlorous acid obtained by the method and apparatus for producing weakly acidic hypochlorous acid of the present invention is compared with conventional weakly acidic hypochlorous acid as shown in the following examples. And bleaching activity is low.
- Amberlite IRC-76 (Organo Corporation) was used as the weakly acidic ion exchange resin. A 500 ml quantity of weakly acidic ion exchange resin was packed into a 1 liter column and used.
- sodium hypochlorite solution a commercially available 12% sodium hypochlorite solution (Turklon Super, Tsurumi Soda Co., Ltd. was used diluted or undiluted.
- Calcium hypochlorite is a commercially available granule.
- a commercially available sodium bicarbonate (Takasugi Pharmaceutical Co., Ltd.) was used as the sodium bicarbonate, and a commercially available calcium lactate (Naito Shoten Co., Ltd.) was used as the sodium lactate.
- the treatment of the sodium hypochlorite solution with the weak acid ion exchange resin was performed using an apparatus in which a pump was connected to the weak acid ion exchange resin column.
- the sodium hypochlorite solution was introduced into the weakly acidic ion exchange resin column using a pump with a predetermined amount of water so that the sodium hypochlorite solution in the reservoir passed through the weakly acidic ion exchange resin at a desired concentration.
- Tap water, pH 7.5 was used for dilution.
- the above 12% sodium hypochlorite solution was diluted with water to a concentration of 100 ppm, and the pH after passing through a weakly acidic ion exchange resin column was measured.
- the amount of water passing through the resin was 2.3 liters / minute.
- the concentration of the sodium hypochlorite solution when introduced into the column was about 100 ppm and the pH was 8.5-8.9.
- the concentration of weakly acidic hypochlorous acid after passing through the weakly acidic ion exchange resin was about 100 ppm, and the pH was 6.0 to 6.3. Table 2 below shows some results.
- the above 12% sodium hypochlorite solution was diluted with water to a concentration of 500 ppm, and the pH after passing through a weakly acidic ion exchange resin column was measured. The amount of water passing through the resin was 2.3 liters / minute. As shown in Table 3 below, the pH of the sodium hypochlorite solution when introduced into the column was 9.1 to 9.2. The pH of the weakly acidic hypochlorous acid after passing through the weakly acidic ion exchange resin was 6.1.
- the above 12% sodium hypochlorite solution was diluted with water to a concentration of 10,000 ppm, and the pH after passing through a weakly acidic ion exchange resin column was measured. The amount of water passing through the resin was 2.3 liters / minute. As shown in Table 4 below, the pH of the sodium hypochlorite solution when introduced into the column was 11.4 to 11.9. The pH of the weakly acidic hypochlorous acid after passing through the weakly acidic ion exchange resin was 7.1.
- the weakly acidic hypochlorous acid obtained from the sodium hypochlorite solution having a concentration of 10,000 ppm in the above process was further passed through the resin.
- the pH of the sodium hypochlorite solution when introduced into the column was 7.2.
- the pH of the weakly acidic hypochlorous acid after passing through the weakly acidic ion exchange resin was 5.8 to 6.5.
- weak acidic hypochlorous acid having an antibacterial effect in the pH range of 5.8 to 6.5 could be produced even at a very high concentration of 10,000 ppm.
- Such a high concentration of weakly acidic hypochlorous acid cannot be produced by a conventional production method.
- the pH was not low enough to generate chlorine gas.
- weakly acidic hypochlorous acid was obtained from a sodium hypochlorite solution having a concentration of 200 ppm using acrylic Diaion (registered trademark) WK40L (Mitsubishi Chemical Corporation) as a weakly acidic ion exchange resin.
- This weakly acidic ion exchange resin has a buffering action around pH 5.0.
- the above 12% sodium hypochlorite solution was diluted with water to a concentration of 200 ppm, and the pH after passing through a weakly acidic ion exchange resin column was measured.
- the amount of water passing through the resin was 2.3 liters / minute.
- the concentration of the sodium hypochlorite solution when introduced into the column was 200 ppm, and the pH was 8.7.
- the concentration of weakly acidic hypochlorous acid after passing through the weakly acidic ion exchange resin was 200 ppm, and the pH was 4.9.
- weakly acidic hypochlorous acid having a pH of 5.2 to 7.3 could be easily obtained by reacting calcium hypochlorite with a weakly acidic ion exchange resin.
- a weakly acidic ion exchange resin it is not necessary to consider the preparation ratio in the chemical reaction in order to adjust the pH in the calcium hypochlorite solution, thereby obtaining weakly acidic hypochlorous acid. be able to.
- an aqueous hypochlorous acid solution can be produced without using an acid and without generating chlorine gas.
- Nonwoven fabric 2 ... Calcium hypochlorite 3 ... Weakly acidic ion exchange resin 4 ⁇ ⁇ ⁇ Weakly acidic hypochlorous acid production equipment 5 ... Dilution device 6 ... Ion exchanger filled container 7 ... Flow path 8 ... Flow path 9 ... Spraying means
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Abstract
Description
特に明記しない限り、実験には以下の材料を使用した。弱酸性イオン交換樹脂は、アンバーライトIRC-76(オルガノ株式会社)を使用した。500mlの量の弱酸性イオン交換樹脂を1lのカラムに充填して使用した。次亜塩素酸ナトリウム溶液は、市販の12%次亜塩素酸ナトリウム溶液(ツルクロンスーパー、鶴見曹達株式会社を希釈して、または希釈せずに使用した。次亜塩素酸カルシウムは、市販の顆粒剤(東ソー株式会社)を使用した。重炭酸ナトリウムは、市販の重炭酸ナトリウム(高杉製薬株式会社)を使用した。乳酸カルシウムは、市販の乳酸カルシウム(株式会社内藤商店)を使用した。
上記12%次亜塩素酸ナトリウム溶液を水で200ppmの濃度に希釈し、弱酸性イオン交換樹脂カラムを通した後のpHを測定した。樹脂通過水量は、2.3リットル/分であった。カラムに導入されるときの次亜塩素酸ナトリウム溶液の濃度は、約150~200ppmの濃度であり、pHは、8.7であった。弱酸性イオン交換樹脂を通過した後の弱酸性次亜塩素酸の濃度は、約150~200ppmであり、pHは、6.1~7.4であった。以下の表1に一部の結果を示した。
上記12%次亜塩素酸ナトリウム溶液100mlに、小さじ一杯(約5g)の炭酸水素ナトリウムを添加して混合した。このとき、溶解していない炭酸水素ナトリウムが残っているため、飽和溶液であることを確認した。この溶液を希釈して、200ppmの濃度の炭酸水素ナトリウム飽和次亜塩素酸ナトリウム溶液を作製し、弱酸性イオン交換樹脂カラムを通した後のpHを測定した。樹脂通過水量は、2.3リットル/分であった。以下の表6に示すように、カラムに導入されるときの次亜塩素酸ナトリウム溶液の濃度は、約200ppmの濃度であり、pHは、8.8~8.9であった。弱酸性イオン交換樹脂を通過した後の弱酸性次亜塩素酸の濃度は、約200ppmであり、pHは、5.8~6.1であった。
以下の3つの実験を行った。
1.顆粒剤の次亜塩素酸カルシウム0.03gを不織布の袋に入れ100mlの精製水中に入れた。遊離残留塩素濃度は、約200ppmであり、PHは、8.6であった。
2.顆粒剤の次亜塩素酸カルシウム0.03gと弱酸性イオン交換樹脂0.6gを不織布の袋に入れ100mlの精製水中に入れた。遊離残留塩素濃度は、約200ppmであり、PHは、7.3であった。
3.顆粒剤の次亜塩素酸カルシウム0.03g、弱酸性イオン交換樹脂0.6g、および乳酸カルシウム0.6gを不織布の袋に入れ100mlの精製水中に入れた。遊離残留塩素濃度は、約200ppmであり、PHは、5.2であった。
本発明の方法によって得られた弱酸性次亜塩素酸が漂白効果を有するか否かを調べた。着色した綿の糸を、上記12%次亜塩素酸ナトリウム溶液を500ppmおよび1000ppmの濃度に希釈した溶液に浸した場合は、漂白されてしまった。一方、上記実験で得られた500ppmおよび1000ppmの濃度の弱酸性次亜塩素酸に、着色した綿の糸を浸して1日置いた。1日後でも布は、漂白されにくかった。
2・・・次亜塩素酸カルシウム
3・・・弱酸性イオン交換樹脂
4・・・弱酸性次亜塩素酸の製造装置
5・・・希釈装置
6・・・イオン交換体充填容器
7・・・流路
8・・・流路
9・・・噴霧手段
Claims (9)
- 弱酸性次亜塩素酸の製造方法であって、
次亜塩素酸塩溶液を、塩素ガスが発生するpH以上で緩衝作用を持つ弱酸性イオン交換体で処理する工程を含む、製造方法。 - 前記次亜塩素酸が次亜塩素酸ナトリウムまたは次亜塩素酸カルシウムであることを特徴とする、請求項1に記載の製造方法。
- 前記弱酸性イオン交換体で処理した後の弱酸性次亜塩素酸のpHがpH3.5~pH7.5であることを特徴とする、請求項1に記載の製造方法。
- 前記次亜塩素酸塩溶液が500ppm以上であることを特徴とする、請求項1に記載の製造方法。
- 塩素ガスが発生するpH以上で緩衝作用を持つ弱酸性イオン交換体を備える、弱酸性次亜塩素酸の製造装置。
- 請求項5に記載の弱酸性次亜塩素酸の製造装置であって、
次亜塩素酸塩溶液の希釈装置と、
前記弱酸性イオン交換体が充填された容器と、
をさらに備えた、請求項5に記載の弱酸性次亜塩素酸の製造装置。 - 塩素ガスが発生するpH以上で緩衝作用を持つ弱酸性イオン交換体と弱酸性次亜塩素酸を噴霧するための噴霧手段とを備えた、殺菌装置。
- 次亜塩素酸カルシウムと塩素ガスが発生するpH以上で緩衝作用を持つ弱酸性イオン交換体とを含む、弱酸性次亜塩素酸の製造のための容器。
- 請求項1~4のいずれか1項に記載の製造方法によって製造された、弱酸性次亜塩素酸。
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EP3787985A4 (en) * | 2018-06-06 | 2022-03-30 | Emmett Manuel Cunningham | METHOD AND SYSTEM FOR PREPARING EXTENDED SHELF LIFE HYPOCHLOROUS ACID SOLUTIONS |
CN111020621A (zh) * | 2019-12-30 | 2020-04-17 | 肇庆钜晨化工有限公司 | 一种用于制备消毒用弱次氯酸水溶液的装置及方法 |
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