A desalination method and device for producing ultra-high purity hypochlorous acid aqueous solution using salt as raw material

Abstract

The present invention discloses a desalination method and device for manufacturing ultra-high purity hypochlorous acid aqueous solution using salt as raw material. The main technical scheme is to use salt as raw material, and the steps of electrolyzing chlorine-containing electrolyte and removing ionic impurities in a single tank are continuously performed, and the raw material can be continuously fed and the high-purity hypochlorous acid aqueous solution after the reaction is continuously harvested, so as to realize continuous production, thereby improving the manufacturing efficiency and purity of the hypochlorous acid aqueous solution and reducing the production cost.

Description

Technical Field

[0001] The invention relates to a desalination method and a device for producing an ultra-high purity hypochlorous acid aqueous solution using salt as a raw material. Background Art

[0002] Hypochlorous acid water is the most widely used disinfectant in the world. It is widely used to disinfect food itself, food containers and packaging materials. Hypochlorous acid is a weak acid. In the aqueous solution state, hypochlorous acid is roughly in molecular form (HClO) when the pH value is between 3-6. When the pH value is above 9, most of it will dissociate into hypochlorite ions (ClO - ), while toxic chlorine gas is easily produced when the pH value is below 3. It is generally believed that hypochlorous acid in molecular form is the main substance that plays a disinfecting role. In terms of bactericidal power, the disinfecting ability of hypochlorous acid molecules is about 80 to 100 times that of hypochlorite ions. It mainly destroys the protein molecular structure of pathogens through oxidation, thereby killing bacteria and inhibiting the activity of viruses.

[0003] Hypochlorous acid water is usually prepared by electrolyzing aqueous solutions of alkali metal chlorides or alkaline earth metal chlorides: for example, electrolyzing aqueous solutions of sodium chloride and potassium chloride can produce hypochlorous acid at the anode of the electrolytic electrode. The hypochlorite aqueous solution obtained by electrolysis is weakly alkaline, and it is usually necessary to add acidic activating components such as hydrochloric acid, phosphoric acid, and citric acid to lower the pH value in order to enhance its disinfection ability. However, the metal salt ions remaining from the electrolysis may accelerate the reduction of hypochlorous acid and lose its cleaning and disinfection capabilities, resulting in a shortened product life of hypochlorous acid water. Therefore, the industry has proposed that the quality of hypochlorous acid water can be improved by removing the metal salt ions in the hypochlorite aqueous solution.

[0004] Taiwan Patent No. 1427189 discloses a method for producing hypochlorous acid sterilized water, wherein the solution is to guide the hypochlorous acid aqueous solution produced by the electrolytic reaction through a cation exchange resin so that the metal ions in the electrolyzed water are replaced by the hydrogen ions in the cation exchange resin so as to adjust the pH value to within the range of 5.5-6.5. The solution of Japanese Patent No. 2009-274950 is to sequentially pass the hypochlorite solution through a hydrogen-type cation exchange resin and a hydroxide-type anion exchange resin to obtain a molecular hypochlorous acid solution. The solution of Taiwan Patent No. 1631072 is to introduce a sodium hypochlorite solution into a weakly acidic ion exchange resin column so that the pH value of the hypochlorous acid aqueous solution is between pH 3.5-7.5. The solution of Japanese Patent No. 2019202907 is to add weakly acidic ion exchange resin particles to the hypochlorite solution for stirring so that the resin captures metal ions, and then separate the ion exchange resin to increase the shelf life of the hypochlorous acid aqueous solution.

[0005] The above patent documents all use ion exchange resins to remove ionic impurities in hypochlorite solutions. The methods disclosed in them all involve first completing an electrolytic reaction in an electrolytic cell, and then introducing the obtained hypochlorite solution into another container containing ion exchange resins for desalination treatment. The lengthy manufacturing process is quite time-consuming and inefficient.

[0006] Accordingly, there is still a high demand in the relevant technical field for a method and apparatus for producing a more efficient and higher purity hypochlorous acid aqueous solution. Summary of the invention

[0007] Therefore, based on the problems existing in the above background technology and in order to meet the above industrial needs, the inventors have made great efforts to conduct research and development, thereby obtaining a desalination method and device for producing ultra-high purity hypochlorous acid aqueous solution using salt as raw material. The main technical solution of the present invention is to continuously carry out the steps of electrolyzing chlorine-containing electrolyte and removing ionic impurities in a single tank, thereby realizing continuous production, thereby improving the manufacturing efficiency of hypochlorous acid aqueous solution and reducing production costs.

[0008] The technical solution of the present invention is:

[0009] A desalination method for producing an ultra-high purity hypochlorous acid aqueous solution using salt as a raw material comprises the following steps:

[0010] (1) allowing a chlorine-containing electrolyte aqueous solution to flow in a tank body extending in a longitudinal direction thereof;

[0011] (2) electrolysis: electrolyzing the chlorine-containing electrolyte aqueous solution to obtain a crude solution containing hypochlorite;

[0012] (3) Removal of ionic components: An electric field is applied in a lateral direction substantially perpendicular to the longitudinal direction to attract and thereby remove ionic components in a crude solution containing hypochlorite ions, thereby obtaining an aqueous solution of hypochlorous acid.

[0013] Preferably, an activation step is included after the electrolysis step in step (2), which includes adding an acidic activation component to the above-mentioned crude solution containing hypochlorite to adjust the pH value of the crude solution to weak acidity.

[0014] Preferably, a blending step is included between the electrolysis step and the activation step, which includes adding a neutral blending solution into the above-mentioned crude solution to adjust the pH value of the crude solution to 6-8.

[0015] Preferably, after the step of removing the ionic components in step (3), the method further comprises subjecting the hypochlorous acid aqueous solution obtained in step (3) to an ion exchange treatment to remove the residual ionic components in the hypochlorous acid aqueous solution.

[0016] The ultra-high purity hypochlorous acid aqueous solution prepared by the present invention after desalination has super strong bactericidal ability, and can be used to prepare eye cleaning and maintenance products such as eye drops, eye washes, eye sprays, ointments and gels, and can also be used to prepare disinfection and sterilization products such as gynecological disinfectants.

[0017] The present invention also provides a desalination device for producing ultra-high purity hypochlorous acid aqueous solution using salt as raw material, comprising a trough body extending along a longitudinal direction, one end of the trough body is provided with an inlet for inputting a chlorine-containing electrolyte aqueous solution, and the other end of the trough body is provided with an outlet for outputting the prepared hypochlorous acid aqueous solution, wherein the outlet is fluidically connected to the inlet so that the chlorine-containing electrolyte aqueous solution can flow from the inlet toward the outlet along the longitudinal direction;

[0018] The tank body is provided with a group of electrolytic electrodes near the inlet, and the electrolytic electrodes include an anode and a cathode, which are suitable for electrolyzing a chlorine-containing electrolyte aqueous solution to generate a crude solution containing hypochlorite;

[0019] The tank body is provided with a set of deionizing electrodes near the outlet, and the deionizing electrodes include an anode and a cathode, which are suitable for applying an electric field in a lateral direction substantially perpendicular to the longitudinal direction to attract and thereby remove ion components in the crude solution to obtain a hypochlorous acid aqueous solution.

[0020] Preferably, the electrolysis electrode is made of a conductive porous material to allow ionic components in the crude solution to be adsorbed on the surface of the electrolysis electrode.

[0021] Preferably, the cell body is provided with an ion membrane parallel to the longitudinal direction near the inlet to separate the cell body into an anode chamber near the anode of the electrolysis electrode and a cathode chamber near the cathode of the group of electrolysis electrodes, and the downstream ends of the anode chamber and the cathode chamber are closed by a porous block.

[0022] Preferably, the cell body is provided with an anion membrane parallel to the longitudinal direction near the anode of the deionizing electrode, and is provided with a cation membrane parallel to the longitudinal direction at the cathode of the deionizing electrode, so that the hypochlorous acid aqueous solution can be harvested in a central area between the anion membrane and the cation membrane.

[0023] Preferably, the tank body includes an inner channel sleeved in the tank body, one end of the inner channel is in fluid communication with the central area to harvest the hypochlorous acid aqueous solution; the inner channel contains an ion exchange resin, so that after the hypochlorous acid aqueous solution enters the inner channel, it is subjected to ion exchange treatment by the ion exchange resin to remove residual ion components, and is discharged from the other end of the inner channel.

[0024] The above technical solution has the following beneficial effects:

[0025] The present invention uses salt solution as raw material, continuously electrolyzes, adjusts pH value and desalinates chlorine-containing electrolyte aqueous solution in a single tank, continuously feeds raw material, and continuously harvests high-purity hypochlorous acid aqueous solution after reaction, thereby realizing continuous production, thereby improving the manufacturing efficiency and purity of hypochlorous acid aqueous solution and reducing production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the process of producing a hypochlorous acid aqueous solution according to a first preferred embodiment of the present invention;

[0027] Figure 2 It is a schematic structural diagram of a hypochlorous acid aqueous solution production device according to a first preferred embodiment of the present invention;

[0028] Figure 3 It is a schematic structural diagram of a hypochlorous acid aqueous solution production device according to a second preferred embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the structure of a hypochlorous acid aqueous solution production device according to a third preferred embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the structure of a hypochlorous acid aqueous solution production device according to a fourth preferred embodiment of the present invention;

[0031] In the figure: 1-tank body; 2-longitudinal direction; 3-inlet; 4-outlet; 5-electrolysis electrode; 6-activation solution inlet; 7-lateral direction; 8-deionization electrode; 9-ion diaphragm; 10-anode chamber; 11-cathode chamber; 12-porous block; 13-anion membrane; 14-cation membrane; 15-acidic liquid; 16-alkaline liquid; 17-central area; 18-pipeline; 19-pipeline; 20-inner channel; 21-ion exchange resin; 22-activation solution inlet. DETAILED DESCRIPTION

[0032] Unless otherwise stated, the following terms used in this specification and each claim have the definitions given below. Please note that the singular term "a" used in the specification and each claim of this case is intended to cover one and more than one of the items contained, such as at least one, at least two or at least three, and does not mean that there is only a single item contained. In addition, the open conjunctions such as "including", "having" and so on used in each claim of this case are to indicate the combination of components or ingredients recorded in the claim, and do not exclude other components or ingredients not stated in the claim. It should also be noted that the term "or" generally also includes "and / or" in meaning, unless the content clearly indicates otherwise. The terms "about" and "substantially" used in the specification and patent scope of this application are used to modify any errors that may vary slightly, but such slight changes will not change the essence of the invention.

[0033] The present invention provides a method and apparatus for continuously producing an ultra-high purity hypochlorous acid aqueous solution using salt as a raw material, which is suitable for rapidly producing a high-purity, substantially salt-free molecular hypochlorous acid aqueous solution. Figure 1 In the preferred embodiment shown, the method includes the following steps: A. feeding; B. electrolysis; C. activation; D. desalination; E. harvesting, and all steps are performed in a single tank.

[0034] exist Figure 2 In the preferred embodiment shown, the tank body 1 extends along a longitudinal direction 2, and an inlet 3 and an outlet 4 are respectively provided at two opposite ends. The tank body 1 is made of a rigid material that does not produce a substantial chemical reaction with other components in the manufacturing process of the hypochlorous acid aqueous solution, including but not limited to metal (such as stainless steel), glass, quartz, ceramic, non-flexible plastic (such as acrylic plastic), etc. The manufacturing process of the tank body 1 is familiar to those with ordinary knowledge in the relevant technical field, and can be adjusted according to different materials. For example, when the tank body 1 is made of metal material, it can be made by conventional metal processing processes such as stamping, rolling, turning, die forming, forging, etc.

[0035] In the feeding step A, a chlorine-containing electrolyte aqueous solution is fed from the inlet 3, and the inlet 3 is fluidically connected to the outlet 4, so that the chlorine-containing electrolyte aqueous solution can flow from the inlet 3 to the outlet 4 in the longitudinal direction 2 in the tank body 1, and chemical reactions are carried out during the flow. The term "chlorine-containing electrolyte" used in this case means a chemical substance that can substantially completely dissociate into free chloride ions (Cl-) and their counteracting cations in the aqueous solution state, including water-soluble salts, acids and bases containing chlorine. Therefore, the term "chlorine-containing electrolyte aqueous solution" used in this case covers supersaturated, saturated or unsaturated aqueous solutions of the above-mentioned chlorine-containing electrolyte, which includes but is not limited to aqueous solutions of alkali metal chloride salts, such as sodium chloride and potassium chloride; aqueous solutions of alkaline earth metal chloride salts; and chloric acids, such as hydrochloric acid. In a preferred embodiment, the "chlorine-containing electrolyte aqueous solution" includes an aqueous solution containing sodium chloride or potassium chloride, especially an aqueous solution containing sodium chloride, such as salt water prepared from refined or crude salt, or natural seawater from the ocean, brine obtained by precipitation and exposure of seawater, or industrial recycled water rich in sodium chloride or potassium chloride. In a preferred embodiment, the "chlorine-containing electrolyte aqueous solution" includes a saturated aqueous solution of sodium chloride or potassium chloride. For the purpose of illustration, the aqueous solution containing sodium chloride is used as a specific example of the chlorine-containing electrolyte aqueous solution in the following text.

[0036] In the electrolysis step B, the chlorine-containing electrolyte aqueous solution fed into the cell body 1 is subjected to electrolysis. The term "electrolysis" used in this case means applying external electrical energy to cause ions in the aqueous solution to undergo redox reactions. Taking an aqueous solution containing sodium chloride as an example, its main electrolysis reaction formula is as follows:

[0037] 2NaCl + 2H2O → 2NaOH + Cl2+ H2↑

[0038] 2NaOH + Cl2 → NaCl + NaClO +H2O

[0039] According to this, Na + , ClO - , Cl - A crude solution of plasma components. Figure 2 In the preferred embodiment shown, a group of electrolytic electrodes 5 having an anode and a cathode is arranged near the inlet 3 of the cell body 1, and is suitable for electrolyzing the chlorine-containing electrolyte aqueous solution. Materials suitable for the electrolytic electrodes are well known in the industry. For example, the anode of the electrolytic electrode 5 may include but is not limited to a graphite electrode, a platinum electrode, and a titanium-based ruthenium-iridium electrode, and the cathode of the electrolytic electrode 5 may include but is not limited to a stainless steel electrode, a titanium electrode, and a graphite electrode.

[0040] The crude solution containing hypochlorite is weakly alkaline (pH 8-10). At this pH value, most of the hypochlorous acid is in the form of hypochlorite ions (ClO - ), its disinfection effect is far inferior to that of molecular hypochlorous acid (HClO). Therefore, it is preferred that the method of the present invention includes a selective activation step C, which includes adding an acidic activation component to a crude solution containing hypochlorite to reduce the pH value of the crude solution, thereby increasing the proportion of molecular hypochlorous acid. It is preferred to adjust the pH value of the crude solution to a weak acid, for example, to a pH range of 5.5-6.5. Acidic activation components suitable for the present invention include, but are not limited to, hydrochloric acid, acetic acid and phosphoric acid. It is preferred to pre-adjust the acidic activation component to an aqueous solution with an appropriate concentration, for example, an aqueous solution with a concentration in the range of 1-3% (v / v), and then inject it into the crude solution. The chemical reaction formula of activation step C is as follows:

[0041] NaClO + HCl → HClO + NaCl

[0042] exist Figure 2 In the preferred embodiment shown, the tank body 1 may be formed with an activation solution inlet 6, which is suitable for introducing the acidic activation component into the crude solution containing hypochlorite to mix the two. Preferably, the activation solution inlet 6 is arranged downstream of the electrolytic electrode 5 along the longitudinal direction 2.

[0043] In a preferred embodiment of the method of the present invention, a selective blending step is further included before the activation step C, for blending the crude solution to have an appropriate concentration and pH value before activation, preferably blending the crude solution to have a substantially neutral pH value, such as a pH value in the range of pH 7-9, and / or a concentration in the range of 50-2000 ppm. In a preferred embodiment, the blending step includes adding a neutral blending solution to the crude solution, and the neutral blending solution includes but is not limited to pure water and deionized water. In terms of structural configuration, a blending solution inlet (not shown) suitable for introducing the neutral blending solution into the crude solution containing hypochlorite can be formed in the tank body 1. Preferably, the blending solution inlet is arranged downstream of the electrolysis electrode 5 and upstream of the activation solution inlet 6 along the longitudinal direction 2.

[0044] exist Figure 2In the preferred embodiment shown, the desalination step D uses the so-called "capacitive deionization" technology (CDI), which includes applying an electric field in a lateral direction 7 substantially perpendicular to the longitudinal direction 2. Hypochlorous acid in molecular form is uncharged and continues to flow along the longitudinal direction 2, but various charged particles in the crude solution are attracted by the electric field due to their charge and deviate from the longitudinal direction 2 and are adsorbed on the surface of the deionization electrode 8, thereby separating and removing Na from the crude solution. + , ClO - , Cl - Plasma components and other charged impurities. Suitable electrode materials are well known in the industry and can be made of conductive porous materials with good conductivity and large specific surface area to facilitate the adsorption of a large number of charged particles. Figure 2 In the preferred specific example shown, a group of deionizing electrodes 8 having an anode and a cathode is arranged near the outlet 4 of the cell body 1, which may include but are not limited to porous activated carbon electrodes, nickel foam electrodes and porous titanium-based ruthenium-iridium electrodes. Since the electric field applied in the desalination step D has only a relatively low operating voltage, usually in the range of 0.8V-1.2V, the components in the crude solution will not undergo electrolytic reactions. It does not require the application of high temperature or high pressure, and thus has the advantages of low energy consumption, low pollution, and low cost compared to traditional desalination technologies such as distillation and reverse osmosis. Moreover, compared to ion exchange resins, the regeneration of the deionizing electrode does not require the use of any acid, alkali, or salt solution. The adsorbed substances can be released by simply changing the direction of the electric field, which also has the advantage of reducing pollutants.

[0045] The present invention improves the manufacturing efficiency of hypochlorous acid aqueous solution by continuously performing the electrolysis step and the desalination step in a single tank. From the perspective of structural configuration, the device of this case can be divided into a front section and a rear section, the front section is the electrolysis section defined by the electrolysis electrode 5, and the rear section is the desalination section defined by the deionization electrode 8. The front section and the rear section maintain constant fluid communication, and no flow control device such as a valve is set between the two to block the continuous flow of the fluid in the tank body 1 along the longitudinal direction 2, so that the chlorine-containing electrolyte aqueous solution fed in is continuously subjected to electrolysis and desalination treatment. The high-purity molecular hypochlorous acid aqueous solution generated by the method and device of this case can be harvested at the outlet 4 of the tank body 1.

[0046] Figure 3The apparatus for producing an aqueous solution of hypochlorous acid according to the second preferred embodiment of the present invention is shown, which basically has the structural configuration of the first preferred embodiment of the present invention, and the main difference is that the electrolysis step B in the first preferred embodiment involves a non-diaphragm electrolysis reaction, while the electrolysis step B in the second preferred embodiment uses a diaphragm electrolysis reaction. In the second preferred embodiment, a group of electrolysis electrodes 5 are also arranged near the inlet 3, but an ion diaphragm 9 parallel to the longitudinal direction 2 is also arranged near the inlet 3, so as to separate the electrolysis area into an anode chamber 10 near the anode of the electrolysis electrode 5 and a cathode chamber 11 near the cathode of the electrolysis electrode 5, and the downstream ends of the two are closed by a porous block 12. The ion diaphragm 9 suitable for the present invention is familiar to the industry. Preferably, the ion diaphragm 9 is a strong acid ion exchange membrane, such as a perfluorosulfonic acid membrane. Through the inlet 3, the chlorine-containing electrolyte solution and pure water / deionized water are introduced into the anode chamber 10 and the cathode chamber 11 respectively. The anode chamber 10 generates chlorine gas through electrolysis, while the cathode chamber 11 generates OH- through electrolysis. Na+ moves to the cathode chamber 11 through the ion diaphragm and reacts with OH - The reaction generates sodium hydroxide. The chlorine gas leaving the anode chamber 10 and the sodium hydroxide leaving the cathode chamber 11 are mixed in the porous block 12 to generate a crude solution containing hypochlorite. The material of the porous block 12 may include but is not limited to titanium mesh, zeolite and porous alumina.

[0047] Figure 4The apparatus for producing hypochlorous acid aqueous solution according to the third preferred embodiment of the present invention is shown, which basically has the structural configuration of the first preferred embodiment of the present invention, except that the desalination step D of the third preferred embodiment uses the so-called "electro-deionization" technology (EDI). It is also provided with a group of deionizing electrodes 8 near the outlet 4 of the tank body 1, so as to apply an electric field in a lateral direction 7 substantially perpendicular to the longitudinal direction 2, so that various charged particles in the crude solution are attracted by the electric field and deviate from the longitudinal direction 2 and move toward the lateral direction 7. The anode of the deionizing electrode 8 preferably includes but is not limited to a titanium-based ruthenium-iridium electrode, a graphite electrode and a platinum electrode, and the cathode of the deionizing electrode 8 includes but is not limited to a stainless steel electrode, a titanium electrode and a graphite electrode. In addition, an anion membrane 13 parallel to the longitudinal direction 2 is provided near the anode of the deionizing electrode 8, and a cation membrane 14 parallel to the longitudinal direction 2 is provided near the cathode of the deionizing electrode 8. Anion membranes and cation membranes suitable for EDI are familiar to the industry. Preferably, the anion membrane 13 is a quaternary amine type anion membrane, and the cation membrane 14 is a sulfonic acid type cation membrane. With this structural configuration, anions such as ClO- and Cl- in the crude solution are attracted by the anode and pass through the anion membrane 13 to form an acidic liquid 15 near the anode, while cations such as Na+ in the crude solution are attracted by the cathode and pass through the cation membrane 14 to form an alkaline liquid 16 near the cathode. Hypochlorous acid in molecular form is uncharged and continues to flow along the longitudinal direction 2, thereby generating a high-purity hypochlorous acid aqueous solution in the central area 17 between the anion membrane 13 and the cation membrane 14, which can be harvested at the outlet 4 connected to the central area 17. In this specific example, the charged particles will not be adsorbed on the surface of the deionizing electrode 8. The generated acidic liquid 15 and alkaline liquid 16 can be recovered, so that they flow back to the inlet 3 along the pipelines 18 and 19 respectively, and are mixed with fresh chlorine-containing electrolyte aqueous solution and then fed into the tank body 1 for treatment.

[0048] Figure 5The apparatus for producing an aqueous hypochlorous acid solution according to the fourth preferred embodiment of the present invention is shown, which basically has the structural configuration of the third preferred embodiment of the present invention, but further includes an inner channel 20 sleeved inside the tank body 1 along the longitudinal direction 2. One end of the inner channel 20 serves as the outlet 4 of the tank body 1, which is fluidically connected to the central area 17 to harvest the aqueous hypochlorous acid solution that has undergone a primary desalination. The inner channel 20 contains an ion exchange resin 21, which is preferably a combination of an acidic ion exchange resin and an alkaline ion exchange resin, or an acidic and alkaline mixed ion resin. For example, the acidic ion exchange resin can be a sulfonic acid type resin, and the alkaline ion exchange resin can be a quaternary amine type resin. The aqueous hypochlorous acid solution entering the inner channel 20 undergoes secondary desalination, including subjecting the aqueous hypochlorous acid solution to ion exchange treatment, wherein the alkaline ion exchange resin is used to adsorb anions such as ClO-, Cl-, and the acidic ion exchange resin is used to adsorb cations such as Na+, and finally a high-purity molecular hypochlorous acid solution that is substantially free of salt is obtained at the other end of the inner channel 20. It is worth noting that, compared with the conventional device that uses only ion exchange resin for desalination, the fourth preferred embodiment of the present invention first uses EDI technology for primary desalination and then uses ion exchange resin 21 for secondary desalination, which can not only effectively improve the purity of the hypochlorous acid aqueous solution, but also extend the service life of the ion exchange resin 21. Therefore, in addition to being able to feed salt water, the fourth preferred embodiment of the present invention is also very suitable for feeding seawater, brine or industrial recycled water. In one embodiment, near one end of the inner channel 20, that is, near the outlet 4 of the tank body 1, another activation liquid inlet 22 is provided, which is suitable for adding an acidic activation component to the hypochlorous acid aqueous solution that has undergone primary desalination to ensure that the pH value of the hypochlorous acid aqueous solution is weakly acidic, for example, within the range of pH 5.5-6.5.

[0049] The manufacturing method and device can be performed manually or automatically, preferably automatically. In the specific example where the manufacturing method and device are automatically controlled, it is preferred to set the process parameters through a computer interface, and monitor data such as the chlorine-containing electrolyte aqueous solution, the feed rate of the acidic activation component, and the concentration of the hypochlorous acid aqueous solution in real time through a detector to ensure the manufacturing quality. Automation can be achieved by allowing the device of the present invention to be controlled by a programmed microprocessor.

[0050] Although the present invention has been described with reference to the above preferred embodiments, it should be recognized that the preferred embodiments are provided for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and changes that are obvious to those skilled in the relevant art may be made without departing from the scope of protection of the present invention.

Claims

1. A desalination device for producing ultra-high purity hypochlorous acid aqueous solution using salt as raw material, characterized in that: The invention comprises a trough body (1) extending along a longitudinal direction (2), wherein one end of the trough body (1) is provided with an inlet (3) for inputting a chlorine-containing electrolyte aqueous solution, and the other end of the trough body (1) is provided with an outlet (4) for outputting a prepared hypochlorous acid aqueous solution, wherein the outlet (4) is in fluid communication with the inlet (3) so that the chlorine-containing electrolyte aqueous solution can flow from the inlet (3) toward the outlet (4) along the longitudinal direction (2); The tank body (1) is provided with a group of electrolytic electrodes (5) near the inlet (3), and the electrolytic electrodes (5) include an anode and a cathode, and are suitable for electrolyzing a chlorine-containing electrolyte aqueous solution to generate a crude solution containing hypochlorite; The tank body (1) is provided with a set of deionizing electrodes (8) near the outlet (4), and the deionizing electrodes (8) include an anode and a cathode, which are suitable for applying an electric field in a transverse direction (7) substantially perpendicular to the longitudinal direction (2) to attract and thereby remove ion components in the crude solution to obtain a hypochlorous acid aqueous solution; The cell body (1) is provided with an ion diaphragm (9) parallel to the longitudinal direction (2) near the inlet (3) to separate the cell body (1) into an anode chamber (10) near the anode of the electrolysis electrode (5) and a cathode chamber (11) near the cathode of the group of electrolysis electrodes (5), and the downstream ends of the anode chamber (10) and the cathode chamber (11) are closed by a porous block (12); The cell body (1) is provided with an anion membrane (13) parallel to the longitudinal direction (2) near the anode of the deionizing electrode (8), and is provided with a cation membrane (14) parallel to the longitudinal direction (2) at the cathode of the deionizing electrode (8), so that the hypochlorous acid aqueous solution can be harvested in a central area (17) located between the anion membrane (13) and the cation membrane (14).

2. A desalination device for producing ultra-high purity hypochlorous acid aqueous solution using salt as raw material according to claim 1, characterized in that: The electrolytic electrode (5) is made of a conductive porous material to allow ionic components in the crude solution to be adsorbed on the surface of the electrolytic electrode (5).

3. A desalination device for producing ultra-high purity hypochlorous acid aqueous solution using salt as raw material according to claim 1, characterized in that: The tank body (1) comprises an inner channel (20) sleeved in the tank body, one end of the inner channel (20) being in fluid communication with the central area (17) to harvest the hypochlorous acid aqueous solution; the inner channel (20) contains an ion exchange resin (21), so that after the hypochlorous acid aqueous solution enters the inner channel (20), it is subjected to ion exchange treatment by the ion exchange resin (21) to remove residual ion components, and is discharged from the other end of the inner channel (20).

4. A desalination method for producing an ultra-high purity hypochlorous acid aqueous solution using salt as a raw material using the desalination device according to any one of claims 1 to 3, characterized in that: It includes the following steps: (1) allowing a chlorine-containing electrolyte aqueous solution to flow in a tank body extending in a longitudinal direction thereof; (2) electrolysis: electrolyzing the chlorine-containing electrolyte aqueous solution to obtain a crude solution containing hypochlorite; (3) Removal of ionic components: An electric field is applied in a lateral direction substantially perpendicular to the longitudinal direction to attract and thereby remove ionic components in a crude solution containing hypochlorite ions, thereby obtaining an aqueous solution of hypochlorous acid.

5. A desalination method for producing an ultra-high purity hypochlorous acid aqueous solution using salt as a raw material according to claim 4, characterized in that: After the electrolysis step in step (2), an activation step is included, which includes adding an acidic activation component to the above-mentioned crude solution containing hypochlorite to adjust the pH value of the crude solution to weak acidity.

6. A desalination method for producing an ultra-high purity hypochlorous acid aqueous solution using salt as a raw material according to claim 5, characterized in that: It includes a blending step between the electrolysis step and the activation step, which includes adding a neutral blending solution into the crude solution to adjust the pH value of the crude solution to 6-8.

7. A desalination method for producing an ultra-high purity hypochlorous acid aqueous solution using salt as a raw material according to claim 6, characterized in that: After the step of removing the ion components in step (3), the method includes subjecting the hypochlorous acid aqueous solution obtained in step (3) to an ion exchange treatment to remove the residual ion components in the hypochlorous acid aqueous solution.

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