CN111676486A - Sodium hypochlorite production process and device for electrolyzing low-concentration brine by using membrane-free method - Google Patents
Sodium hypochlorite production process and device for electrolyzing low-concentration brine by using membrane-free method Download PDFInfo
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Abstract
The invention relates to a sodium hypochlorite production process and a device for electrolyzing low-concentration brine by a membrane-free method, wherein saturated brine is mixed with dilution water in softened water to obtain diluted brine; the water supplement in the softened water directly enters the electrolysis device; the softened water consists of diluted water and supplemented water. The flow ratio of the saturated saline water to the soft water is 1:15.5, and the concentration mass fraction of the mixed saline water is 2%; the flow ratio of the dilution water to the make-up water is 1: 1; the electrolyzer is a diaphragm-free transparent tube plate type electrolyzer; the electrode pole spacing of the electrolytic cell is 1-1.5 mm; a clapboard sealing device is arranged in the electrolytic cell and comprises a hydrogen channel, an electrolytic cell clapboard, a sealing ring, an electrode clamping groove and a fixing plate; the cathode part adopts a high-catalysis titanium-based metal oxide hydrogen evolution electrode, and the coating is composed of one or more of ruthenium oxide, iridium oxide, nickel oxide, molybdenum oxide, cerium oxide and lanthanum oxide; the concentration of the sodium hypochlorite is about 0.8 percent. The invention not only reduces the equipment operation cost, but also expands the application of the sodium hypochlorite generator without the membrane method.
Description
Technical Field
The invention relates to the technical field related to brine electrolysis, in particular to a sodium hypochlorite production process and a sodium hypochlorite production device for electrolyzing low-concentration brine by a membrane-free method, which are mainly applied to water treatment and disinfection.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The molecular formula of the sodium hypochlorite is NaClO, is a broad-spectrum efficient disinfectant, and is widely applied to places such as drinking water disinfection, sewage treatment, livestock and poultry farm disinfection and the like. The membrane-free sodium hypochlorite generator electrolyzes dilute saline water with certain concentration to form sodium hypochlorite solution, and is widely applied at present due to convenient raw material purchase, safe operation and convenient use. The main electrolytic reaction process of the sodium hypochlorite generator can be represented by the following equation:
and (3) total reaction: NaCl + H2O + electric → NaClO + H2↑
Anode: 2Cl--2e＝Cl2↑
Cathode: 2H2O+2e＝H2↑+2OH-
Interelectrode: cl2+H2O＝HCl+HClO
HClO+NaOH＝NaClO+H2O
The salt and electricity consumption determine the operating cost of the sodium hypochlorite generator by the membrane-free electrolysis method. At present, the domestic method for reducing the salt consumption is to increase the current and improve the effective chlorine concentration of a liquid outlet of an electrolytic cell under the brine concentration of 3-4 percent in mass fraction, and the higher the effective chlorine concentration is, the lower the salt consumption is, but the inventor finds that: excessive pursuit of high effective chlorine concentration (> 0.8%) under domestic existing sodium hypochlorite generator technical conditions brings many disadvantages:
(1) theoretically speaking the electric current is big more, the effective chlorine concentration is high more, but domestic sodium hypochlorite generator negative pole is mostly pure titanium negative pole, this kind of electrode material has higher hydrogen evolution overpotential, along with the current density risees, the hydrogen evolution overpotential increases, adopt about 3mm at the interpolar distance domestic more simultaneously, lead to the solution resistance between the electrode also to increase, the two combined action makes the bath pressure rise, the power consumption increases, not only the cost of using electricity increases, holistic electrolysis trough calorific capacity also can grow simultaneously, the temperature risees in the electrolysis trough, sodium hypochlorite decomposition speed is accelerated, lead to the current efficiency to reduce.
(2) The whole heating value of the electrolytic cell is increased, and heat exchange equipment is additionally added, so that the cost of the equipment is increased.
(3) Sodium hypochlorite is easily oxidized at the anode and reduced at the cathode, and belongs to mass transfer process control, namely the higher the sodium hypochlorite concentration is, the easier sodium hypochlorite is to diffuse to the cathode and the anode, and the higher the probability of the following reactions at the cathode and the anode is.
Anode: 6ClO-+3H2O→2ClO3 -+4Cl-+6H++2O2+6e(1)
Cathode: ClO-+H2O+2e→Cl-+2OH-(2)
As can be seen from the chemical reaction formulas (1) and (2), the sodium hypochlorite undergoes side reaction at the cathode and the anode, which not only causes the current efficiency to be further reduced, but also causes the chlorate content to be increased.
(4) The sodium hypochlorite solution produced by the prior art has high salinity, and the application of sodium hypochlorite by an electrolytic method in the fields of circulating water and the like is limited.
Disclosure of Invention
In order to solve the problems, the invention provides a sodium hypochlorite production process and a device for electrolyzing low-concentration brine by a membrane-free method, namely, the low-concentration brine is electrolyzed, a clapboard sealing device is adopted to enable most of electrolyte to flow through a small chamber of an electrolytic cell unit, a water replenishing process is added to cool the interior of the electrolytic cell, the inter-polar distance between a cathode and an anode is reduced, a high-catalysis titanium-based metal oxide hydrogen evolution electrode is introduced to reduce the cell pressure, the salt consumption and the electricity consumption are balanced, the heat productivity of the electrolytic cell is reduced, the salinity in the sodium hypochlorite solution is reduced, and the operation cost of the sodium hypochlorite production by the electrolytic method is greatly reduced.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a sodium hypochlorite production process and a device for electrolyzing low-concentration brine by a membrane-free method, which comprises the following steps:
mixing saturated saline water with dilution water in softened water to obtain diluted saline water; simultaneously, the water supplement in the softened water directly enters the electrolysis device;
mixing the dilute brine and the supplemented water in an electrolytic cell, and finally flowing out of an electrolytic device;
after the electrolysis device is full of liquid, electrolysis is started;
the electrolyzed hypochlorous acid solution and the gas-liquid mixture of the hydrogen enter a storage device at the same time, and air is blown to dilute the generated hydrogen to below 1 percent for discharge;
the softened water consists of dilution water and water supplement.
Compared with the domestic existing production process, the production process can reduce the salt consumption by about 25 percent, the power consumption by about 10 percent and the salinity in the sodium hypochlorite solution by about 30 percent, thereby not only expanding the application field of the sodium hypochlorite by an electrolytic method, but also greatly reducing the operation cost of equipment.
In a second aspect of the invention, there is provided sodium hypochlorite prepared by any one of the above methods. The concentration of the prepared sodium hypochlorite is about 0.8%, so that the salt consumption and the power consumption are balanced, the heat productivity of an electrolytic cell is reduced, the salinity of a sodium hypochlorite solution is reduced, and the operation cost of producing the sodium hypochlorite by an electrolytic method is greatly reduced.
In a third aspect of the present invention, there is provided a sodium hypochlorite production apparatus for electrolyzing low-concentration brine without using a membrane method, comprising: the electrolytic device is a diaphragm-free transparent tube plate type electrolytic tank.
The invention adopts the clapboard sealing device to enable most electrolyte to flow into the small cell of the electrolytic cell, increases the water replenishing process to cool the interior of the electrolytic cell, reduces the distance between the cathode and the anode, introduces the high-catalysis titanium-based metal oxide hydrogen evolution electrode to reduce the cell voltage, achieves the balance of salt consumption and power consumption, and reduces the heat productivity of the electrolytic cell.
The invention has the beneficial effects that:
(1) compared with the domestic existing production process, the production process can reduce the salt consumption by about 25 percent, the power consumption by about 10 percent and the salinity in the sodium hypochlorite solution by about 30 percent, thereby not only expanding the application field of the sodium hypochlorite by the electrolytic method, but also greatly reducing the operation cost of equipment.
(2) The method is simple, low in cost, strong in practicability and easy to popularize.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a process flow diagram of example 1 of the present invention;
FIG. 2 is a structural view of an electrolytic cell and a flow diagram of an electrolytic solution in example 1 of the present invention;
FIG. 3 is a sectional view of an electrolytic cell A-A according to example 1 of the present invention;
FIG. 4 is a table comparing salt consumption, electricity consumption and salinity test in sodium hypochlorite solution performed under the same electrolysis conditions as the domestic prior art and apparatus for producing products (comparative example) in example 1 of the present invention;
the electrolytic cell comprises an electrolytic cell liquid inlet 1, an electrolytic cell water supplementing inlet 2, an electrolytic cell liquid outlet 3, a partition plate sealing device 4, a gas channel 5, an electrode fixing plate 6, an electrolyte flow direction schematic diagram 7, an electrolytic cell shell 8, a partition plate sealing and fixing device 9, an electrolytic cell wiring copper bar 10, a cathode 11, a cathode 12, an anode 4-1, a partition plate 4-2, a hydrogen outlet 4-3, a sealing ring 4-4, a fixing hole 4-5, an electrode clamping groove 4-6 and a fixing plate.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A sodium hypochlorite production process and a device for electrolyzing low-concentration brine by a membrane-free method comprise the following steps:
(1) preparing low-concentration brine by mixing saturated brine and softened water according to a certain flow ratio, wherein the softened water flow is divided into two parts of dilution water and water supplement, mixing the saturated brine and the dilution water by using a strong brine pump and a soft water pump to obtain brine with a certain concentration, and simultaneously directly feeding the other part of the water supplement into an electrolytic cell. The mixed brine enters the electrolytic cell, is mixed with the subsequent water supplement in the electrolytic cell, and finally flows out of the electrolytic cell.
(2) After the electrolytic bath is full of liquid, starting an electrolytic power supply to start electrolysis.
(3) And (3) simultaneously feeding the electrolyzed hypochlorous acid solution with a certain concentration, hydrogen and other gas-liquid mixtures into the storage tank, starting the fan at the moment, and blowing air into the fan to dilute the generated hydrogen to below 1% for discharge.
In some embodiments, the ratio of the saturated brine flow V1 to the soft water flow V2 is 1:15.5, and the diluted brine concentration obtained by mixing the saturated brine flow V1 and the soft water flow V2 is 2% by mass, that is, the brine concentration at the outlet without electrolysis is 2%.
In some embodiments, the soft water flow rate V2 is equal to the sum of the dilution water flow rate V3 and the make-up water flow rate V4, and the ratio of the dilution water flow rate V3 to the make-up water flow rate V4 is 1:1, so as to reduce the temperature inside the electrolytic cell by adding the make-up water process.
In some embodiments, the electrolytic cell is a diaphragm-free transparent tube plate type electrolytic cell, so that the internal reaction condition of the electrolytic cell can be observed conveniently.
In some embodiments, the interpolar distance between the cathode and anode of the diaphragm-free transparent tube plate electrolyzer is 1-1.5 mm. The solution resistance between the electrodes is reduced, the tank voltage is reduced, and the power consumption and the heat productivity are reduced.
In some embodiments, the diaphragm-free transparent tube plate electrolyzer contains a diaphragm sealing device inside. In the invention, the electrolytic cell is divided into a plurality of unit cells by adding the clapboard sealing device, and the main function is to divide the electrolysis into a plurality of unit cells and make the brine flow between the electrodes as much as possible; meanwhile, the arrangement of the clapboard sealing device can also be used together with a water replenishing and cooling process and a high-catalytic cathode to reduce the salt consumption and the salinity, and the specific data are shown in figure 4.
In some embodiments, the partition sealing device comprises a hydrogen channel, an electrolysis unit cell partition, a sealing ring, an electrode clamping groove and an electrode fixing plate clamping groove, so that the installation and the manufacture are convenient, and the segmentation effect is improved.
In some embodiments, the cathode part of the diaphragm-free transparent tube plate type electrolytic cell adopts a high-catalytic titanium-based metal oxide hydrogen evolution electrode so as to obtain better catalytic activity and improve the electrolysis efficiency.
The composition of the high catalytic titanium-based metal oxide hydrogen evolution electrode coating is not particularly limited in the present application, and therefore, in some embodiments, the high catalytic titanium-based metal oxide hydrogen evolution electrode coating comprises one or more of ruthenium oxide, iridium oxide, nickel oxide, molybdenum oxide, cerium oxide and lanthanum oxide, so as to obtain better catalytic activity and electrode stability.
In some embodiments, the prepared sodium hypochlorite concentration is about 0.8%. The salt consumption and the power consumption are balanced, the heat productivity of the electrolytic cell is reduced, the salinity of the sodium hypochlorite solution is reduced, and the operation cost of producing the sodium hypochlorite by the electrolytic method is greatly reduced.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1:
as shown in figure 1, a sodium hypochlorite production process for electrolyzing low-concentration brine by a membrane-free method comprises the following steps: the method comprises the following steps of preparing brine with the mass fraction of 2% by proportioning saturated brine and softened water according to the flow ratio of 1:15.5, wherein the softened water flow is divided into two parts of dilution water and water supplement, the flow ratio of the dilution water to the water supplement is 1:1, and the dilution water is used for mixing with the saturated brine to obtain brine with a certain concentration and entering an electrolytic cell. The water replenishing function is to cool the interior of the electrolytic cell, and simultaneously maintain the final electrolyte concentration of the whole system to be 2%, namely the brine concentration at the outlet of the electrolytic cell is 2% by mass. After the electrolytic cell is full of liquid, an electrolytic power supply is started to electrolyze, the obtained sodium hypochlorite solution and hydrogen mixture enter a storage tank from a liquid outlet 3 of the electrolytic cell, and a fan is started to blow in fresh air to dilute the hydrogen to below 1% and discharge the hydrogen.
Referring to fig. 2, the process adopts a membraneless transparent tube plate electrolytic cell, which mainly comprises an electrolytic cell liquid inlet 1, a water replenishing liquid inlet 2, an electrolytic cell liquid outlet 3, a clapboard sealing device 4, an electrode fixing plate 6, an electrolytic cell shell 8, a clapboard sealing and fixing device 9 and an electrolytic cell wiring copper bar 10. As shown in figure 3, the clapboard sealing device further comprises a clapboard 4-1, a hydrogen outlet 4-2, a sealing ring 4-3, a fixing hole 4-4, an electrode clamping groove 4-5 and an electrode fixing plate clamping groove 4-6. The inside of the electrolytic cell is divided into unit electrolytic cells I, II, III, IV, V and IV by the partition plate sealing device, a seal is formed between a seal ring 4-3 and an electrolytic cell shell 8, electrolyte is prevented from flowing between the partition plate sealing device and the inner wall of the shell, most of liquid flows between a cathode and an anode, the utilization rate of brine is improved, the specific liquid flows to the electrolyte as shown in an electrolyte flow direction schematic 7 in figure 2, the brine with certain concentration obtained by mixing dilution water and saturated brine enters the electrolytic cell from an electrolytic cell liquid inlet 1 and flows through the unit electrolytic cells I, II and III in sequence, then the unit electrolytic cell IV is mixed with the replenishing water entering from an electrolytic cell water replenishing inlet, the replenishing water flows through the unit electrolytic cells V and IV in sequence, and then flows out of the electrolytic cell through an electrolytic cell liquid outlet 3. After the electrolysis is started, the generated hydrogen enters the storage tank through the gas channel 5 and the sodium hypochlorite solution together via the liquid outlet 3 of the electrolytic cell, and the whole electrolysis process is completed. The electrode clamping grooves 4-5 in the separator sealing device 4 are mainly used for fixing the cathode 11 and the anode 12, the distance between the electrodes can be adjusted by adjusting the distance between the electrode clamping grooves 4-5, the electrode distance is 1.2mm, and compared with the electrode distance of 3mm of a domestic conventional electrolytic cell, the solution resistance is reduced, and the power consumption is reduced. Meanwhile, the cathode 11 adopts a high-catalytic titanium-based metal oxide hydrogen evolution electrode (purchased from Pachylomiki metal materials, Inc.) wherein the coating components consist of ruthenium oxide, iridium oxide, nickel oxide and molybdenum oxide. Compared with the conventional pure titanium cathode in China, the hydrogen evolution overpotential is greatly reduced, and the electrolysis efficiency of the whole electrolytic cell is improved.
The results of salt consumption, electricity consumption and salinity test comparison in sodium hypochlorite solution performed on the above examples and the domestic existing product production process and apparatus under the same electrolysis conditions are shown in fig. 4.
Example 2:
a sodium hypochlorite production process for electrolyzing low-concentration brine by a membrane-free method comprises the following steps: the saturated brine and softened water are proportioned according to the flow ratio of 1:12 to prepare brine with the mass fraction of about 2%, wherein the softened water flow is divided into two parts of dilution water and water supplement, the flow ratio of the dilution water to the water supplement is 1:1.1, and the dilution water is used for mixing with the saturated brine to obtain brine with a certain concentration and then entering an electrolytic cell. The water replenishing function is to cool the interior of the electrolytic cell, and simultaneously maintain the final electrolyte concentration of the whole system to be about 2%, namely the brine concentration at the outlet of the electrolytic cell is about 2% by mass. After the electrolytic cell is full of liquid, an electrolytic power supply is started to electrolyze, the obtained sodium hypochlorite solution and hydrogen mixture enter a storage tank from a liquid outlet 3 of the electrolytic cell, and a fan is started to blow in fresh air to dilute the hydrogen to below 1% and discharge the hydrogen.
The process adopts a membraneless transparent tube plate electrolytic tank which mainly comprises an electrolytic tank liquid inlet 1, a water supplementing liquid inlet 2, an electrolytic tank liquid outlet 3, a clapboard sealing device 4, an electrode fixing plate 6, an electrolytic tank shell 8, a clapboard sealing and fixing device 9 and an electrolytic tank wiring copper bar 10. The clapboard sealing device also comprises a clapboard 4-1, a hydrogen outlet 4-2, a sealing ring 4-3, a fixing hole 4-4, an electrode clamping groove 4-5 and an electrode fixing plate clamping groove 4-6. The inside of the electrolytic cell is divided into unit electrolytic cells I, II, III, IV, V and IV by the partition plate sealing device, a seal is formed between a seal ring 4-3 and an electrolytic cell shell 8, electrolyte is prevented from flowing between the partition plate sealing device and the inner wall of the shell, most of liquid flows between an anode and a cathode, the utilization rate of brine is improved, the brine with certain concentration obtained by mixing dilution water and saturated brine enters the electrolytic cell from an electrolytic cell liquid inlet 1 and flows through the unit electrolytic cells I, II and III in sequence, then the brine is mixed with water entering from an electrolytic cell water inlet in the unit electrolytic cell IV and flows out of the electrolytic cell through an electrolytic cell liquid outlet 3 in sequence. After the electrolysis is started, the generated hydrogen enters the storage tank through the gas channel 5 and the sodium hypochlorite solution together via the liquid outlet 3 of the electrolytic cell, and the whole electrolysis process is completed. The electrode clamping grooves 4-5 in the separator sealing device 4 are mainly used for fixing the cathode 11 and the anode 12, and the distance between the electrodes can be adjusted by adjusting the distance between the electrode clamping grooves 4-5, the distance between the electrodes is 1mm, and compared with the distance between the electrodes of a domestic conventional electrolytic cell and 3mm, the distance between the electrodes reduces the resistance of a solution and the power consumption. Meanwhile, the cathode 11 adopts a high-catalytic titanium-based metal oxide hydrogen evolution electrode (purchased from Pachylomiki metal materials, Inc.) wherein the coating components consist of ruthenium oxide, iridium oxide, nickel oxide and molybdenum oxide. Compared with the conventional pure titanium cathode in China, the hydrogen evolution overpotential is greatly reduced, and the electrolysis efficiency of the whole electrolytic cell is improved.
Example 3:
a sodium hypochlorite production process for electrolyzing low-concentration brine by a membrane-free method comprises the following steps: the saturated brine and softened water are proportioned according to the flow ratio of 1:16 to prepare brine with the mass fraction of about 2%, wherein the softened water flow is divided into two parts of dilution water and water supplement, the flow ratio of the dilution water to the water supplement is 1:1.2, and the dilution water is mixed with the saturated brine to obtain brine with a certain concentration and enters an electrolytic cell. The water replenishing function is to cool the interior of the electrolytic cell, and simultaneously maintain the final electrolyte concentration of the whole system to be about 2%, namely the brine concentration at the outlet of the electrolytic cell is about 2% by mass. After the electrolytic cell is full of liquid, an electrolytic power supply is started to electrolyze, the obtained sodium hypochlorite solution and hydrogen mixture enter a storage tank from a liquid outlet 3 of the electrolytic cell, and a fan is started to blow in fresh air to dilute the hydrogen to below 1% and discharge the hydrogen.
The process adopts a membraneless transparent tube plate electrolytic tank which mainly comprises an electrolytic tank liquid inlet 1, a water supplementing liquid inlet 2, an electrolytic tank liquid outlet 3, a clapboard sealing device 4, an electrode fixing plate 6, an electrolytic tank shell 8, a clapboard sealing and fixing device 9 and an electrolytic tank wiring copper bar 10. The clapboard sealing device also comprises a clapboard 4-1, a hydrogen outlet 4-2, a sealing ring 4-3, a fixing hole 4-4, an electrode clamping groove 4-5 and an electrode fixing plate clamping groove 4-6. The inside of the electrolytic cell is divided into unit electrolytic cells I, II, III, IV, V and IV by the partition plate sealing device, a seal is formed between a seal ring 4-3 and an electrolytic cell shell 8, electrolyte is prevented from flowing between the partition plate sealing device and the inner wall of the shell, most of liquid flows between an anode and a cathode, the utilization rate of brine is improved, the brine with certain concentration obtained by mixing dilution water and saturated brine enters the electrolytic cell from an electrolytic cell liquid inlet 1 and flows through the unit electrolytic cells I, II and III in sequence, then the brine is mixed with water entering from an electrolytic cell water inlet in the unit electrolytic cell IV and flows out of the electrolytic cell through an electrolytic cell liquid outlet 3 in sequence. After the electrolysis is started, the generated hydrogen enters the storage tank through the gas channel 5 and the sodium hypochlorite solution together via the liquid outlet 3 of the electrolytic cell, and the whole electrolysis process is completed. The electrode clamping grooves 4-5 in the separator sealing device 4 are mainly used for fixing the cathode 11 and the anode 12, and the distance between the electrodes can be adjusted by adjusting the distance between the electrode clamping grooves 4-5, the distance between the electrodes is 1.5mm, and compared with the distance between the electrodes of a domestic conventional electrolytic cell and 3mm, the distance between the electrodes reduces the resistance of a solution and the power consumption. Meanwhile, the cathode 11 adopts a high-catalytic titanium-based metal oxide hydrogen evolution electrode (purchased from Pachylomiki metal materials, Inc.) wherein the coating components consist of ruthenium oxide, iridium oxide, nickel oxide and molybdenum oxide. Compared with the conventional pure titanium cathode in China, the hydrogen evolution overpotential is greatly reduced, and the electrolysis efficiency of the whole electrolytic cell is improved.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A sodium hypochlorite production process for electrolyzing low-concentration brine by a membrane-free method is characterized by comprising the following steps:
mixing saturated saline water with dilution water in softened water to obtain diluted saline water; simultaneously, the water supplement in the softened water directly enters the electrolysis device;
mixing the dilute brine and the supplemented water in an electrolytic cell, and finally flowing out of an electrolytic device;
after the electrolysis device is full of liquid, electrolysis is started;
the electrolyzed hypochlorous acid solution and the gas-liquid mixture of the hydrogen enter a storage device at the same time, and air is blown to dilute the generated hydrogen to below 1 percent for discharge;
the softened water consists of dilution water and water supplement.
2. The process for producing sodium hypochlorite by electrolyzing low-concentration brine without using a membrane method as claimed in claim 1, wherein the volume ratio of the saturated brine flow rate V1 to the soft water flow rate V2 is 1: 12-16.
3. The process for producing sodium hypochlorite by electrolyzing low-concentration brine without using a membrane method as claimed in claim 1, wherein the concentration of the dilute brine is 2-2.5% by mass, and the concentration of the brine at the liquid outlet when not electrolyzed is 2-2.5%.
4. The production process of sodium hypochlorite for electrolyzing low-concentration brine by the membrane-free method according to claim 1, wherein the volume ratio of the dilution water flow V3 to the water replenishing flow V4 is 1: 1-1.2.
5. Sodium hypochlorite produced by the process of any one of claims 1 to 4.
6. The utility model provides a sodium hypochlorite apparatus for producing of no membrane method electrolysis low concentration salt water which characterized in that includes: the electrolytic device is a diaphragm-free transparent tube plate type electrolytic tank.
7. The apparatus for producing sodium hypochlorite by electrolyzing a low concentration brine without using a membrane according to claim 6, wherein the distance between the anode and the cathode is 1 to 1.5 mm.
8. The apparatus for producing sodium hypochlorite by the membrane-free electrolysis of a low-concentration brine according to claim 6, wherein the diaphragm-free transparent tube plate-type electrolytic cell contains a separator sealing means inside.
9. The apparatus for producing sodium hypochlorite by the membraneless electrolysis of low-concentration brine according to claim 8, wherein the partition sealing means comprises a hydrogen passage, an electrolysis cell chamber partition, a sealing ring, an electrode clamping groove and an electrode fixing plate clamping groove.
10. The apparatus for producing sodium hypochlorite by the membrane-free electrolysis of low-concentration brine according to claim 6, wherein the cathode of the electrolysis apparatus adopts a high-catalytic titanium-based metal oxide hydrogen evolution electrode;
preferably, the high-catalysis titanium-based metal oxide hydrogen evolution electrode coating component is one or more of ruthenium oxide, iridium oxide, nickel oxide, molybdenum oxide, cerium oxide and lanthanum oxide.
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