Sodium hypochlorite manufacturing system

Abstract

One aspect of the present invention provides a first means for obtaining saturated brine and purified water, which includes an anode chamber and a cathode chamber separated by a diaphragm, wherein the anode chamber converts the saturated brine into an anode product containing chlorine gas and anode water, and the cathode chamber converts the purified water into sodium hydroxide, hydrogen gas, and hydroxide ions (OH - a second means for converting the anodic product and the cathodic product into a cathodic product containing sodium hypochlorite and hydrogen gas; a third means for reacting the anodic product and the cathodic product to produce a mixture containing sodium hypochlorite and hydrogen gas; and a third means for converting the sodium hydroxide, the hydroxide ions (OH - and a fourth means for preventing the anode chamber from migrating through the diaphragm.

Description

[Technical Field]

[0001] The present invention relates to a system for producing sodium hypochlorite. [Background technology]

[0002] Sodium hypochlorite (NaOCl) is used in a variety of fields, including water supply and sewerage systems, wastewater treatment, seawater electrolysis, treatment of ship ballast water, and sterilization and disinfection of agricultural and food products.

[0003] Such sodium hypochlorite is produced using a low-concentration sodium hypochlorite production system or a high-concentration sodium hypochlorite production system depending on the concentration.

[0004] Low-concentration sodium hypochlorite (0.4-1.0%) is obtained by passing saltwater through a membraneless electrolysis cell where a contact electrode reaction takes place. High-concentration sodium hypochlorite (2% or more) is obtained by reacting chlorine gas, generated in a membrane-type electrolysis cell where the anode and cathode are separated by a membrane, with caustic soda in a separate reactor.

[0005] Figure 1 is a schematic diagram of a conventional system for producing high-concentration sodium hypochlorite. Referring to Figure 1, the conventional system for producing sodium hypochlorite may include a raw water treatment device 10 that treats raw water to obtain purified water, a brine treatment device 22 that treats saturated brine produced from a portion of the purified water and salt stored in a salt tank 21, and the purified saturated brine obtained from the brine treatment device 22 and the remainder of the purified water may be transferred to an anode chamber and a cathode chamber that constitute an electrolysis device 40, respectively.

[0006] The electrolysis device 40 may be a diaphragm-type electrolysis cell and may include an anode chamber, a cathode chamber, and a diaphragm separating the anode chamber and the cathode chamber. The anode chamber and the cathode chamber may include an anode chamber 50 and a cathode chamber 60 for circulating the anode product and the cathode product, respectively.

[0007] The anode tank 50 separates the anode water and chlorine gas, and the cathode tank 60 separates the cathode water and hydrogen gas. The chlorine gas and the cathode water are then transferred to a separate reactor 70 and reacted to produce sodium hypochlorite.

[0008] The anode water contains not only sodium chloride (NaCl), which is the raw material for the reaction in the anode chamber, but also OCl. - , HOCl, ClO3 - Since the water contains chlorine compounds such as ClO3, it can be desalted into hydrochloric acid, sodium hydroxide, etc. and then discharged to the outside or recycled to the salt tank 21 for reuse. - Since the components are not removed by conventional desalination processes and accumulate, the anode water must be discharged to the outside via a designated location, but in this case, there is a problem that the discharged anode water pollutes the surrounding environment.

[0009] Furthermore, the physical and chemical processes such as gas-liquid separation and desalination of the anode product and the cathode product require a complex configuration of multiple facilities (tanks, piping, etc.), which increases the burden of maintenance and repair.

[0010] In response to this, a method has been proposed in which the anode water is not reused and / or discharged, but is instead injected into the generated sodium hypochlorite. In order to maintain the concentration and / or pH of the generated sodium hypochlorite within a set range, the concentration of sodium hydroxide (NaOH) in the cathode water must be increased. In this case, the sodium hydroxide, hydroxide ions (OH - ) flow into the anode chamber through the diaphragm, increasing the pH of the anode water. Referring to Figure 4, when the pH of the aqueous solution containing dissolved chlorine gas (Cl2) increases, the concentration of chlorine gas in the aqueous solution decreases, while the concentration of HOCl, OCl, etc. - The concentrations of the components increase relatively. HOCl and OCl are concentrated in the anodic water. - The components react with each other to form ClO3 - ClO3 in the anode water - This will increase the concentration of the component.

[0011] Also, ClO3 - When anodic water with a high concentration of components is injected into the generated sodium hypochlorite, the ClO3 in the sodium hypochlorite - The concentration of the component increases, and even subjects treated with this sodium hypochlorite may develop excessive amounts of ClO3 - The remaining components may have adverse effects on the surrounding environment and the human body (ClO3 - is a substance harmful to humans that is included in the drinking water quality monitoring items. Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention is intended to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a sodium hypochlorite production system that is environmentally friendly and easy to maintain, repair, and manage. [Means for solving the problem]

[0013] One aspect of the present invention provides a first means for obtaining saturated brine and purified water, which includes an anode chamber and a cathode chamber separated by a diaphragm, wherein the anode chamber converts the saturated brine into an anode product containing chlorine gas and anode water, and the cathode chamber converts the purified water into sodium hydroxide, hydrogen gas, and hydroxide ions (OH - a second means for converting the anodic product and the cathodic product into a cathode product containing sodium hypochlorite and hydrogen gas; a third means for reacting the anodic product and the cathodic product to produce a mixture containing sodium hypochlorite and hydrogen gas; and a third means for converting the sodium hydroxide, the hydroxide ions (OH - a fourth means for preventing the migration of the ion exchanger, the ion exchanger, or a combination thereof through the diaphragm to the anode chamber.

[0014] In one embodiment, the third means may react the anodic product and the cathodic product in-situ.

[0015] In one embodiment, the membrane may be permeable to cations.

[0016] In one embodiment, the surface of the diaphragm facing the cathode chamber may have a blocking property against anions.

[0017] In one embodiment, the surface of the diaphragm facing the cathode chamber may have a cation exchange functional group.

[0018] In one embodiment, the cation exchange functional group may be a carboxyl group, a sulfonic acid group, or a combination thereof.

[0019] In one embodiment, the fourth means can include a temperature sensor that measures the temperature of the anode product, the cathode product, or a combination thereof; and heat exchange means that controls the temperature of the anode chamber, the cathode chamber, or a combination thereof based on a signal from the temperature sensor.

[0020] In one embodiment, the fourth means can include a conductivity sensor that measures the conductivity of the anode product, the cathode product, or a combination thereof; and a flow rate control means that controls the injection amount of the saturated salt water, the purified water, or a combination thereof injected into the second means based on a signal from the conductivity sensor.

[0021] In one embodiment, the fourth means can include an ORP sensor that measures the oxidation-reduction potential of the anode product, the cathode product, or a combination thereof; and a flow rate control means that controls the injection amount of saturated salt water, the purified water, or a combination thereof injected into the second means based on a signal from the ORP sensor.

[0022] In one embodiment, the third means may further include a gas-liquid separation means for separating and discharging hydrogen gas from the mixture. [Effects of the Invention]

[0023] According to one aspect of the present invention, a system for producing sodium hypochlorite is provided. The system comprises a cathode product produced in a cathode chamber of a diaphragm-type electrolysis device, and a cathode product containing sodium hydroxide and hydroxide ions (OH - ) in the anode water by including a means for preventing the migration of ClO3 - This effectively prevents the concentration of the component from increasing above the standard value, thereby improving the safety of sodium hypochlorite used as a disinfectant, treatment agent, etc.

[0024] In addition, since the entire amount of the anode product and the cathode product is substantially effectively reacted in the third means of the sodium hypochlorite production system, it is possible to solve the environmental problem caused by the production and discharge of anode water containing multiple chlorine compounds as impurities.

[0025] In addition, the second means for electrolysis in the sodium hypochlorite production system includes an anode chamber, a cathode chamber, and a diaphragm, but does not include a cathode tank for circulating the cathode product obtained in the cathode chamber and / or an anode tank for circulating the anode product obtained in the anode chamber, as necessary, thereby solving the problem of environmental degradation caused by the discharge of anode water containing a large amount of by-products from a conventional anode water tank.

[0026] The effects of the present invention are not limited to the effects described above, but should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description of the present invention or the claims. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a schematic diagram of a conventional sodium hypochlorite generating apparatus. [Figure 2] FIG. 2 is a schematic diagram of a sodium hypochlorite production system according to one embodiment of the present invention. [Figure 3] FIG. 3 is a schematic diagram of an electrolysis apparatus according to one embodiment of the present invention. [Figure 4]FIG. 4 is a graph showing the relative concentrations of chlorinated compounds as a function of pH. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts that are not relevant to the description are omitted to clearly explain the present invention, and similar parts are designated by similar reference numerals throughout the specification.

[0029] Throughout this specification, the term "connected" to another part includes not only "directly connected" but also "indirectly connected" through an intervening member. Furthermore, unless otherwise specified, the term "comprises" a certain component does not mean that the component can further comprise other components, but does not mean that the component excludes other components.

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Sodium hypochlorite manufacturing system

[0031] FIG. 2 is a schematic diagram of a sodium hypochlorite production system according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of an electrolysis apparatus according to an embodiment of the present invention.

[0032] 2 and 3, a system for producing sodium hypochlorite according to one aspect of the present invention includes first means 110, 120, 130 for obtaining saturated brine and purified water; an anode chamber and a cathode chamber separated by a diaphragm; the anode chamber converts the saturated brine into an anode product including chlorine gas and anode water; and the cathode chamber converts the purified water into sodium hydroxide, hydrogen gas, and hydroxide ions (OH). -a second means 200 for converting the anode product and the cathode product into a cathode product containing sodium hypochlorite and hydrogen gas; a third means 300 for reacting the anode product and the cathode product to produce a mixture containing sodium hypochlorite and hydrogen gas; and a third means 300 for converting the anode product and the cathode product into a cathode product containing sodium hydroxide, hydroxide ions (OH - ) or a combination thereof from migrating through the diaphragm to the anode chamber.

[0033] The first means may include a raw water treatment unit 110, a salt tank 120, and a salt water treatment process .

[0034] The raw water treatment device 110 can produce purified water by removing impurities such as calcium and magnesium from raw water. The raw water treatment device can be one selected from the group consisting of a water softener, a reverse osmosis membrane process, a nanoseparation membrane process, an electrodialysis process, an electroadsorption deionization process, and a combination of two or more thereof, and preferably, can be a water softener and / or a reverse osmosis membrane process, but is not limited thereto.

[0035] A portion of the purified water generated in the raw water treatment device 110 is supplied to the salt tank 120 to generate saturated salt water, and the remaining portion of the purified water is supplied to the cathode chamber 220 of the second means 200 to generate saturated salt water, sodium hydroxide, hydrogen gas, and hydroxide ions (OH - ) into cathode products including

[0036] The salt tank 120 can store solid salt. The salt can be dissolved in purified water provided by the raw water treatment device 110 and supplied to the anode chamber 210 of the second means 200 in an aqueous solution state.

[0037] The salt tank 120 can store the salt supplied from the outside, and can receive purified water from the raw water treatment device 110 to generate an aqueous solution in which the salt is dissolved, preferably saturated salt water, and supply the aqueous solution to the anode chamber 210 of the second means 200.

[0038] The salt tank 120 may include a salt supply unit into which the salt is introduced in solid form from the outside, a purified water inlet pipe into which purified water is supplied from the raw water treatment device 110, and a saturated salt water outlet pipe through which the saturated salt water is discharged.

[0039] In addition, a brine treatment unit 130 may be provided between the salt tank 120 and the anode chamber 210. The brine treatment unit 130 removes impurities such as calcium and magnesium contained in the saturated brine discharged from the salt tank 120, thereby preventing contamination of the diaphragm 230 of the second means 200, increasing the efficiency of the electrolysis reaction, and extending the life of the diaphragm 230.

[0040] The saltwater treatment device 130 may include a heating unit having a heater in a water tank of a predetermined size, and a water softener having a chelating resin capable of adsorbing and removing impurities from the saltwater that has passed through the heating unit. The heating unit may appropriately maintain the temperature, pH, etc. of the saturated saltwater that has not been refined, thereby improving the adsorption efficiency of the water softener. For example, the appropriate temperature and pH of the saturated saltwater may be, but are not limited to, 50 to 80°C and 9 or higher, respectively.

[0041] The second means 200 may be a diaphragm-type electrolysis device including an anode chamber 210 and a cathode chamber 220 separated by a diaphragm 230, the anode chamber 210 converting the saturated brine into an anode product including chlorine gas and anode water, and the cathode chamber 220 converting the purified water into sodium hydroxide, hydrogen gas, and hydroxide ions (OH - ) into cathode products including

[0042] The anode chamber 210 may include an anode and may hold anode water containing substances produced by an electrolytic reaction at the anode and gas phase substances, and the cathode chamber 220 may include a cathode and may hold cathode water containing substances produced by an electrolytic reaction at the cathode and gas phase substances.

[0043] When a predetermined voltage is applied to the second means 200, the following substances may be generated in the anode chamber 210 and the cathode chamber 220.

[0044] In the anode chamber 210, sodium ions (Na + ), chlorine gas (Cl2) and chlorine ions (Cl - ) can be produced in the cathode chamber 220, and in the cathode chamber 220, hydrogen gas (H) and hydroxide ions (OH - The sodium ions generated in the anode chamber 210 can move to the cathode chamber 220 through the diaphragm 230 and react with the hydroxide ions generated in the cathode chamber 220 to generate sodium hydroxide.

[0045] The third means 300 can react the anode product and the cathode product to generate a mixture containing sodium hypochlorite, anode water, and hydrogen gas.

[0046] In the third means 300, a mixture containing sodium hypochlorite produced by the reaction of chlorine gas in the anode product with sodium hydroxide in the cathode product, and hydrogen gas transferred to the third means together with the sodium hydroxide in the cathode product is produced.

[0047] In particular, in the third means 300, the entire amount of the anodic product and the cathodic product is effectively reacted, so that OCl - , HOCl, ClO3 - This can solve the environmental problems caused by the generation and discharge of anode water containing chlorine compounds as impurities.

[0048] The third means 300 may be provided separately outside the second means 200. An anode cell and a cathode cell may be provided between the anode chamber 210 and the third means 300, and between the cathode chamber 220 and the third means 300, respectively, and the anode water and the cathode water stored in the anode cell and the cathode cell may circulate between the anode chamber and the anode cell, and between the cathode chamber and the cathode cell, respectively. The anode cell and the cathode cell are facilities for storing the anode water and the cathode water that circulate through the anode chamber 210 and the cathode chamber 220 of the second means 200, respectively.

[0049] However, in order to properly circulate and discharge the substances generated in the anode chamber 210 and the cathode chamber 220, not only do the storage tanks, piping, and other equipment become complicated, but also the anode water becomes toxic due to ClO3 - There is a problem of increased concentration of

[0050] On the other hand, by constructing the third means 300 integrally with the second means 200, it is possible to appropriately omit the anode tank, cathode tank, circulation piping, etc., thereby significantly improving maintenance and repairability and environmental friendliness.

[0051] When the second and third means 200 and 300 are configured as an integrated unit, the chlorine gas and sodium hydroxide generated in the anode chamber 210 and the cathode chamber 220 of the second means 200, respectively, are transferred to the third means 300 provided downstream of the second means 200 and reacted in-situ to generate sodium hypochlorite.

[0052] The term "in-situ reaction" as used herein refers to a series of processes in which chlorine gas, anode water, and sodium hydroxide are generated in the anode chamber 210 and the cathode chamber 220, respectively, and simultaneously react effectively to generate sodium hypochlorite in real time.

[0053] Of the sodium hydroxide produced in the cathode chamber 220, the residual sodium hydroxide that is not involved in the production of sodium hypochlorite can act as a buffer to adjust the pH of the produced sodium hypochlorite to a set range. In this case, the sodium hypochlorite production system does not need to include equipment for injecting sodium hydroxide from the outside into the third means.

[0054] The in-situ reaction of the anode product and the cathode product, which is carried out in the third means 300, is carried out to control the material balance between the anode chamber 210 and the cathode chamber 220 of the second means 200, specifically, the hydroxide ions (OH - This can be realized by the fourth means (not shown) for controlling the concentration gradient of the ions.

[0055] As described above, in order to solve the problems caused by the circulation and discharge of anode water, a method has been proposed in which anode water is not reused and / or discharged but is instead injected into the produced sodium hypochlorite.

[0056] In order to maintain the concentration and / or pH of the generated sodium hypochlorite within a set range, the concentration of sodium hydroxide (NaOH) in the cathode water must be increased by, for example, injecting sodium hydroxide into the cathode chamber 220 from the outside. - ) flows into the anode chamber 210 through the diaphragm 230, increasing the pH of the anode water.

[0057] Referring to Figure 4, when the pH of the anode water in which chlorine gas (Cl2) is dissolved increases, the concentration of chlorine gas in the anode water decreases, while the concentration of HOCl, OCl - The concentrations of the components increase relatively. The concentrations of HOCl and OCl in the anodic water are higher. - The components react with each other to form ClO3 - ClO3 in the anode water - This will increase the concentration of the component.

[0058] Also, ClO3- When anodic water with a high concentration of components is injected into the generated sodium hypochlorite, the ClO3 in the sodium hypochlorite - The concentration of the component increases, and even subjects treated with this sodium hypochlorite may develop excessive amounts of ClO3 - The remaining components may have adverse effects on the surrounding environment and the human body.

[0059] On the other hand, the fourth means is configured to extract the sodium hydroxide and the hydroxide ions (OH - ) or a combination thereof can be prevented from migrating to the anode chamber 210 through the diaphragm 230. That is, the fourth means maintains a high concentration of sodium hydroxide among the cathode products, while simultaneously preventing ClO3 among the anode products. - This can serve to keep the concentration of ingredients low.

[0060] The diaphragm 230 may be an ion exchange membrane, preferably a cation exchange membrane that is permeable to cations. The cation exchange membrane is a membrane that is permeable to sodium ions (Na + ) can be made to permeate and move into the cathode chamber 220.

[0061] In addition, the surface of the diaphragm 230 facing the cathode chamber 220 may have a shielding property against anions. For example, the surface of the diaphragm 230 facing the cathode chamber 220 may have a shielding property against anions such as sodium hydroxide (NaOH) and hydroxide ions (OH - ) from penetrating or migrating into the anode chamber 210.

[0062] The surface of the diaphragm facing the cathode chamber may have a cation exchange functional group, such as a carboxyl group, a sulfonic acid group, or a combination thereof, preferably a carboxyl group, but is not limited thereto.

[0063] The diaphragm is configured to separate the sodium hydroxide and hydroxide ions (OH - ) or a combination thereof is prevented from migrating through the diaphragm 230 to the anode chamber 210 to prevent ClO3 - This can help maintain the concentration of the component below a set range.

[0064] The fourth means can include a temperature sensor that measures the temperature of the anode product, the cathode product, or a combination thereof; and a heat exchange means that controls the temperature of the anode chamber 210, the cathode chamber 220, or a combination thereof based on a signal from the temperature sensor.

[0065] The higher the temperature of the second means 200, the more ions move through the diaphragm 230, particularly hydroxide ions (OH - ) is promoted, so that the sodium hydroxide, the oxide ions (OH - ) or a combination thereof can be effectively prevented from migrating through the diaphragm 230 to the anode chamber 210.

[0066] Specifically, a temperature sensor is installed at the outlet side of the second means 200 to measure the temperature of the anode product, the cathode product, or a combination thereof. When the temperature of the electrolysis product measured by the temperature sensor exceeds a predetermined range, the temperature sensor provides a signal required for cooling to a heat exchange means provided in the anode chamber 210, the cathode chamber 220, or a combination thereof, thereby controlling the temperature of the second means 200.

[0067] The fourth means may include a conductivity sensor and / or an ORP sensor that measures the conductivity and / or oxidation-reduction potential of the anode product, the cathode product, or a combination thereof; and a flow rate control means that controls the injection amount of the saturated salt water, the purified water, or a combination thereof injected into the second means 200 based on a signal from the conductivity sensor and / or ORP sensor.

[0068] As the concentration of sodium hydroxide in the cathode product increases, the conductivity and redox potential of the cathode product increase, and the concentration gradient of sodium hydroxide between the anode chamber 210 and the cathode chamber 220 increases. This concentration gradient is due to the flow of hydroxide ions (OH) from the cathode chamber 220 to the anode chamber 210. - ) can be promoted.

[0069] In contrast, a conductivity sensor and / or an ORP sensor for measuring the conductivity and / or oxidation-reduction potential of the cathode product is installed on the outlet side of the cathode chamber 220, and when the conductivity and / or oxidation-reduction potential of the cathode product measured by the conductivity sensor and / or the ORP sensor exceeds a set range, the conductivity sensor and / or the ORP sensor may provide a signal to the flow rate control means for controlling the flow rate of the purified water injected into the cathode chamber 220 to increase the flow rate of the purified water, thereby diluting the concentration of sodium hydroxide in the cathode product to an appropriate range.

[0070] As the concentration of sodium hydroxide in the cathode product is diluted, the concentration gradient of sodium hydroxide between the anode chamber 210 and the cathode chamber 220 decreases. - ) or a combination thereof can be effectively prevented from migrating through the diaphragm 230 to the anode chamber 210.

[0071] The third means 300 may further include a gas-liquid separation means for separating and discharging hydrogen gas from the mixture. The hydrogen gas generated in the cathode chamber 220 is one of the typical by-products that needs to be separated and discharged because it does not contribute to the production of sodium hypochlorite.

[0072] In the case of a conventional sodium hypochlorite production system, such hydrogen gas is separated and discharged in a cathode chamber equipped to circulate the material produced in the cathode chamber. However, the sodium hypochlorite production system according to the present invention does not include such a cathode chamber, and therefore, a certain amount of hydrogen gas can be mixed with the sodium hypochlorite produced in the third means 300.

[0073] The gas-liquid separation means selectively separates and discharges the hydrogen gas from the mixture produced in the third means 300, thereby stably maintaining the concentration of the produced sodium hypochlorite and reducing the risk of hydrogen explosion, thereby contributing to the overall safety of the sodium hypochlorite production system.

[0074] The above description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention may be modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not restrictive. For example, components described as a single type may be implemented in a distributed form, and similarly, components described as distributed may be implemented in a combined form.

[0075] The scope of the present invention is defined by the claims set forth below, and all modifications and variations that fall within the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention. [Explanation of symbols]

[0076] 10, 110: Raw water treatment equipment 21, 120: Salt tank 22, 130: Salt water treatment 40, 200: Electrolyzer 50:Anode tank 51: Primary desalination equipment 52: Secondary desalination equipment 60:Cathode tank 70, 300: Reactor 210: Anode (anode chamber) 220: Cathode (cathode chamber) 230: Diaphragm

Claims

1. A first means for obtaining saturated brine and purified water; The anode chamber converts the saturated brine into an anode product containing chlorine gas and anode water, and the cathode chamber converts the purified water into sodium hydroxide, hydrogen gas, and hydroxide ions (OH － a second means for converting the cations of the cations of the present invention into a cathode product comprising: a third means for reacting the anodic product and the cathodic product to produce a mixture containing sodium hypochlorite and hydrogen gas; and Among the cathode products, the sodium hydroxide, the hydroxide ions (OH － ) or a combination thereof is prevented from migrating to the anode chamber through the diaphragm, thereby preventing the hydroxide ions (OH － a fourth means for controlling the concentration gradient of the third means reacts the anode product and the cathode product in situ; the fourth means being a temperature sensor on the outlet side of the second means for measuring the temperature of the anode product, the cathode product, or a combination thereof; and a heat exchange means for controlling the temperature of the anode chamber, the cathode chamber, or a combination thereof in accordance with a signal from the temperature sensor; The third means is a process in which sodium hydroxide produced by the cathode reacts with chlorine produced by the anode in situ to produce sodium hypochlorite, The second means and the third means are integrally configured, the third means is provided downstream of the second means; When the temperature of the cathode product measured by the temperature sensor exceeds a set range, the temperature sensor provides a signal to a heat exchange means provided in the cathode chamber to perform cooling.

2. The system for producing sodium hypochlorite according to claim 1, wherein the diaphragm is permeable to cations.

3. 3. The system for producing sodium hypochlorite according to claim 2, wherein the surface of the diaphragm facing the cathode chamber has a shielding property against anions.

4. 4. The system for producing sodium hypochlorite according to claim 3, wherein the surface of the diaphragm facing the cathode chamber has a cation exchange functional group.

5. The system for producing sodium hypochlorite according to claim 4, wherein the cation exchange functional group is a carboxyl group, a sulfonic acid group, or a combination thereof.

6. 2. The system for producing sodium hypochlorite according to claim 1, wherein the third means further includes a gas-liquid separation means for separating and discharging hydrogen gas from the mixture.

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