Ion exchange membrane caustic soda electrolysis device

Abstract

The utility model relates to ion membrane electrolysis technical field, concretely to the utility model discloses ion membrane caustic soda electrolytic device, including electrolytic cell, install a plurality of baffle in electrolytic cell, and the inner chamber of electrolytic cell is divided into a plurality of electrolytic cavities through the baffle, and the ion membrane is arranged in each electrolytic cavity, and the ion membrane divides electrolytic cavity into anode chamber and cathode chamber, and the both sides of ion membrane are provided with net -like support frame, and the inner wall of electrolytic cell is provided with fixed groove, and the ion membrane is fixed in fixed groove through net -like support frame, and the cathode chamber is provided with cathode sheet, and the anode chamber is provided with anode sheet, and the side wall bottom of each anode chamber is provided with concentrated brine liquid inlet pipe, and the side wall bottom of each cathode chamber is provided with water solution liquid inlet pipe, and the tail end of concentrated brine liquid inlet pipe and water solution liquid inlet pipe all is provided with spray assembly, the utility model discloses can improve the electrolytic uniformity and fullness of electrolyte, improve electrolytic efficiency, improve the installation stability of ion membrane.

Description

Technical Field

[0001] This utility model relates to the field of ion-exchange membrane electrolysis technology, specifically to an ion-exchange membrane caustic soda electrolysis device. Background Technology

[0002] Ion-exchange membrane caustic soda electrolysis technology is a core process in the chlor-alkali industry, producing sodium hydroxide, chlorine, and hydrogen through the electrolysis of saturated brine. Traditional electrolysis equipment typically uses monopolar or bipolar electrolytic cells, but these methods suffer from the following problems: Low electrolysis efficiency: The electrolyte is introduced through a straight pipe, resulting in uneven distribution, which leads to insufficient reaction on the electrode surface and a decrease in current efficiency; Maintenance difficulties: The electrolytic cell is an integral structure, and local failures require shutdown for repair, affecting the continuity of production; Poor stability of ion exchange membranes: lacking effective support, ion exchange membranes are easily deformed or damaged by electrolyte impact, shortening their service life; While existing technologies have attempted to improve performance by modifying electrode structures or optimizing flow channel designs, they still cannot simultaneously achieve electrolysis uniformity, modular maintenance, and membrane stability. Therefore, a novel electrolysis device is urgently needed to solve these technical problems and achieve efficient, stable, and flexibly maintainable ion-exchange membrane caustic soda electrolysis production. Utility Model Content

[0003] The purpose of this invention is to provide an ion-exchange membrane caustic soda electrolysis device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an ion-exchange membrane caustic soda electrolysis device, comprising an electrolytic cell, wherein multiple partitions are installed inside the electrolytic cell, and the inner cavity of the electrolytic cell is divided into multiple electrolysis chambers by the partitions. Each electrolysis chamber is provided with an ion-exchange membrane, which divides the electrolysis chamber into an anode chamber and a cathode chamber. A mesh support frame is provided on both sides of the ion-exchange membrane. A fixing groove is provided on the inner wall of the electrolytic cell, and the ion-exchange membrane is fixed in the fixing groove by the mesh support frame. A cathode plate is provided in the cathode chamber, and an anode plate is provided in the anode chamber. A concentrated brine inlet pipe is provided at the bottom of the side wall of each anode chamber, and an aqueous solution inlet pipe is provided at the bottom of the side wall of each cathode chamber. A spray assembly is provided at the tail end of each concentrated brine inlet pipe and the aqueous solution inlet pipe.

[0005] The present invention is further configured such that the spray assembly includes a spray pipe, and a plurality of spray heads are uniformly arranged on the spray pipe. The spray heads are arranged facing the corresponding anode plate and cathode plate. Through the cooperation of the spray pipe and the spray heads, concentrated brine and aqueous solutions and other electrolyte solutions can be uniformly sprayed onto the corresponding electrode plates, so that the electrode plates and electrolyte solutions are in uniform and sufficient contact, thereby providing electrolysis efficiency.

[0006] The present invention is further configured such that a brine outlet pipe is provided at the top of the side wall of the anode cavity, a chlorine gas outlet pipe is provided at the top of the anode cavity, a sodium hydroxide solution outlet pipe is provided at the top of the side wall of the cathode cavity, and a hydrogen gas outlet pipe is provided at the top of the cathode cavity.

[0007] The present invention is further configured such that a concentrated brine inlet main pipe and an aqueous solution inlet main pipe are provided on the outside of the electrolytic cell, and multiple inlet branch pipes are provided on both the concentrated brine inlet main pipe and the aqueous solution inlet main pipe. Each inlet branch pipe is provided with an inlet valve, so as to realize the overall liquid inlet and individual control of the concentrated brine inlet pipe and the aqueous solution inlet pipe.

[0008] The present invention is further configured such that a brine outlet main pipe and a sodium hydroxide outlet main pipe are provided on the outside of the electrolytic cell, and each brine outlet main pipe and sodium hydroxide outlet main pipe is provided with an outlet branch pipe. The outlet branch pipe is connected to the corresponding brine outlet pipe and sodium hydroxide solution outlet pipe. Each outlet branch pipe is provided with an outlet valve, which is used to control the opening and closing of the outlet branch pipe. The discharged liquid is transported to the corresponding brine outlet main pipe or sodium hydroxide outlet main pipe through the corresponding outlet branch pipe, so as to realize the classified collection of products. When a certain part needs to be repaired, the operation can be partially stopped.

[0009] The present invention is further configured such that a hydrogen outlet main pipe and a chlorine outlet main pipe are provided on the outside of the electrolytic cell, and each of the hydrogen outlet main pipes is provided with an outlet branch pipe. The outlet branch pipes are connected to the corresponding hydrogen outlet pipes and chlorine outlet pipes, and each outlet branch pipe is provided with an outlet valve to realize individual control of each hydrogen outlet pipe and chlorine outlet pipe when chlorine and hydrogen are emitted.

[0010] The present invention is further configured such that insulating mounting plates are provided on both sides of the mesh support frame, and mounting grooves are provided on the insulating mounting plates. The anode plate and cathode plate are installed in the corresponding mounting grooves. A clamping plate is provided on the outer side of the anode plate and cathode plate, and the clamping plate passes through the insulating mounting plate and is fixed to the mesh support frame by bolts.

[0011] The present invention is further provided with sealing gaskets between the inner side of the mesh support frame and the ion membrane, and between the outer side of the mesh support frame and the fixing groove. The sealing gaskets can enhance the sealing performance of the ion membrane during installation in the electrolytic cell and reduce gas leakage on both sides.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. Improved electrolysis uniformity and efficiency. This invention, through the design of spray pipes and spray heads, uniformly sprays concentrated brine and aqueous solutions onto the electrode surfaces of the corresponding anode and cathode plates, solving the problem of uneven electrolyte distribution caused by traditional single-inlet straight pipe liquid distribution. The spray assembly ensures more thorough contact between the electrolyte and the electrodes, reduces flow rate deviation, and significantly improves the uniformity and efficiency of the electrolysis reaction. Simultaneously, the combination of the small electrode spacing installation structure and the mesh support frame further optimizes the space utilization within the electrolysis chamber, reduces electrolyte flow resistance, thereby improving overall electrolysis efficiency and reducing energy consumption.

[0013] 2. This utility model divides the electrolytic cell into multiple independent electrolysis chambers using partitions. Each chamber is equipped with separate liquid inlet, liquid outlet, and gas outlet structures, and is equipped with control valves. This modular design allows for maintenance of individual electrolysis units without shutting down the entire system; simply closing the corresponding valve isolates the faulty unit, while other units continue to operate normally. The linkage design of the main and branch pipes enables centralized distribution and independent control of fluids, significantly improving the operational flexibility and production continuity of the unit, and reducing downtime losses. 3. This invention adds a mesh support frame to both sides of the ion exchange membrane, which is installed by locking it in a fixing groove. This enhances the membrane's impact resistance, preventing wrinkles or damage caused by electrolyte erosion, and facilitates quick disassembly and replacement. The introduction of the sealing gasket effectively reduces gas leakage between the anode and cathode cavities, ensuring the collection efficiency of the reaction gases (chlorine and hydrogen). The combination of insulating mounting plates and clamping plates not only ensures the insulation safety of the electrodes but also achieves precise positioning and stable installation of the electrode plates, further improving the reliability and service life of the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the ion-exchange membrane caustic soda electrolysis device of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the ion-exchange membrane caustic soda electrolysis device of this utility model. Figure 2 ; Figure 3 This is a cross-sectional view of the overall structure of the present invention. Figure 1 ; Figure 4 This is a cross-sectional view of the overall structure of the present invention. Figure 2 ; Figure 5 This is an exploded view of the connection structure between the ion exchange membrane, anode plate, cathode plate, mesh support frame and fixing groove in this utility model; Figure 6 This is an exploded view of the connection structure between the ion exchange membrane, the mesh support frame, the insulating mounting plate, the anode plate, the cathode plate, and the clamping plate in this utility model.

[0015] The components represented by each number in the attached diagram are listed below: 1. Electrolytic cell; 2. Baffle plate; 3. Electrolysis chamber; 4. Ion-exchange membrane; 5. Mesh support frame; 6. Fixing tank; 7. Cathode plate; 8. Anode plate; 9. Concentrated brine inlet pipe; 10. Aqueous solution inlet pipe; 11. Spray pipe; 12. Spray head; 13. Dilute brine outlet pipe; 14. Chlorine gas outlet pipe; 15. Sodium hydroxide solution outlet pipe; 16. Hydrogen gas outlet pipe; 17. Concentrated brine inlet main pipe; 18. Aqueous solution inlet main pipe; 19. Inlet branch pipe; 20. Inlet valve; 21. Dilute brine outlet main pipe; 22. Sodium hydroxide outlet main pipe; 23. Outlet branch pipe; 24. Outlet valve; 25. Hydrogen outlet main pipe; 26. Chlorine outlet main pipe; 27. Outlet branch pipe; 28. Outlet valve; 29. ​​Insulating mounting plate; 30. Mounting groove; 31. Pressing plate; 32. Sealing gasket. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides a technical solution: Please refer to Figures 1-6 An ion-exchange membrane caustic soda electrolysis device includes an electrolytic cell 1, with multiple partitions 2 installed inside the electrolytic cell 1. The inner cavity of the electrolytic cell 1 is divided into multiple electrolysis chambers 3 by the partitions 2. Each electrolysis chamber 3 is equipped with an ion-exchange membrane 4, which divides the electrolysis chamber 3 into an anode chamber and a cathode chamber. A mesh support frame 5 is provided on both sides of the ion-exchange membrane 4. A fixing groove 6 is provided on the inner wall of the electrolytic cell 1. The ion-exchange membrane 4 is fixed in the fixing groove 6 by the mesh support frame 5. A cathode plate 7 is provided in the cathode chamber, and an anode plate 8 is provided in the anode chamber. A concentrated brine inlet pipe 9 is provided at the bottom of the side wall of each anode chamber, and an aqueous solution inlet pipe 10 is provided at the bottom of the side wall of each cathode chamber. A spray assembly is provided at the tail end of both the concentrated brine inlet pipe 9 and the aqueous solution inlet pipe 10.

[0018] Please see Figures 1-6 As one implementation of the spray assembly: the spray assembly includes a spray pipe 11, on which a plurality of spray heads 12 are evenly arranged. The spray heads 12 are arranged toward the corresponding anode plate 8 and cathode plate 7. Through the cooperation of the spray pipe 11 and the spray heads 12, concentrated brine and aqueous solutions and other electrolyte solutions can be evenly sprayed onto the corresponding electrode plates, so that the electrode plates and electrolyte solutions are in uniform and sufficient contact, thereby improving the electrolysis effect.

[0019] Please see Figures 1-6As one embodiment of the anode cavity: a brine outlet pipe 13 is provided at the top of the side wall of the anode cavity, a chlorine gas outlet pipe 14 is provided at the top of the anode cavity, a sodium hydroxide solution outlet pipe 15 is provided at the top of the side wall of the cathode cavity, and a hydrogen gas outlet pipe 16 is provided at the top of the cathode cavity.

[0020] Please see Figures 1-6 As one embodiment of the electrolytic cell 1: a concentrated brine inlet main pipe 17 and an aqueous solution inlet main pipe 18 are provided on the outside of the electrolytic cell 1. Multiple inlet branch pipes 19 are provided on both the concentrated brine inlet main pipe 17 and the aqueous solution inlet main pipe 18. The inlet branch pipes 19 are connected to the corresponding concentrated brine inlet pipe 9 and aqueous solution inlet pipe 10. Each inlet branch pipe 19 is provided with an inlet valve 20, so as to realize the overall liquid inlet and individual control of the concentrated brine inlet pipe 9 and the aqueous solution inlet pipe 10, which facilitates the individual maintenance of a single electrolysis unit.

[0021] This invention provides a brine outlet main pipe 21 and a sodium hydroxide outlet main pipe 22 on the outside of the electrolytic cell 1. Each brine outlet main pipe 21 and sodium hydroxide outlet main pipe 22 is equipped with an outlet branch pipe 23, which is connected to the corresponding brine outlet pipe 13 and sodium hydroxide solution outlet pipe 15. Each outlet branch pipe 23 is equipped with an outlet valve 24, which controls the opening and closing of the outlet branch pipe 23. The discharged liquid is transported through the corresponding outlet branch pipe 23 to the corresponding brine outlet main pipe 21 or sodium hydroxide outlet main pipe 22, realizing the classified collection of products. When a certain part needs maintenance, the operation can be partially stopped.

[0022] This invention provides a hydrogen outlet main pipe 25 and a chlorine outlet main pipe 26 on the outside of the electrolytic cell 1. Each hydrogen outlet main pipe 25 is equipped with an outlet branch pipe 27, which is connected to the corresponding hydrogen outlet pipe 16 and chlorine outlet pipe 14. Each outlet branch pipe 27 is equipped with an outlet valve 28, which enables individual control of each hydrogen outlet pipe 16 and chlorine outlet pipe 14 when chlorine and hydrogen are emitted, thereby facilitating local maintenance without the need for overall shutdown.

[0023] Please see Figures 1-6 As one embodiment of the mesh support frame 5: Insulating mounting plates 29 are provided on both sides of the mesh support frame 5. Mounting grooves 30 are provided on the insulating mounting plates 29. Anode plates 8 and cathode plates 7 are installed in the corresponding mounting grooves 30. Pressing plates 31 are provided on the outer side of the anode plates 8 and cathode plates 7. The pressing plates 31 pass through the insulating mounting plates 29 and are fixed to the mesh support frame 5 by bolts.

[0024] In this invention, sealing gaskets 32 are provided between the inner side of the mesh support frame 5 and the ion membrane 4, and between the outer side of the mesh support frame 5 and the fixing groove 6. The sealing gaskets 32 can enhance the sealing performance of the ion membrane 4 when it is installed in the electrolytic cell 1 and reduce the leakage of gas on both sides.

[0025] In summary, the working principle and specific workflow of this utility model are as follows: When this utility model is in use, concentrated brine enters the anode chamber through the concentrated brine inlet pipe 9, and is sprayed onto the anode plate 8 by the action of the spray pipe 11 and the spray head 12 to achieve electrolysis. The generated chlorine gas is discharged from the chlorine gas outlet pipe 14 at the top, and the generated sodium ions pass through the ion membrane 4 and enter the cathode chamber. Meanwhile, the aqueous solution enters the cathode cavity through the aqueous solution inlet pipe 10 and is sprayed onto the cathode plate 7 with the cooperation of the spray pipe 11 and the spray head 12 to achieve electrolysis. The generated hydrogen gas is discharged through the hydrogen gas outlet pipe 16. The generated hydroxide ions combine with sodium ions to form sodium hydroxide, which is mixed with water to form a sodium hydroxide solution and discharged through the sodium hydroxide solution outlet pipe 15. This invention uses the combination of spray pipe 11 and spray head 12 to change the traditional single-inlet straight pipe structure for liquid distribution, which easily leads to uneven distribution of electrolyte on the electrode surface. This invention uses a direct spraying method to distribute electrolyte to the electrode gap, which reduces the flow deviation of electrolyte on the electrode surface, enhances contact uniformity, and improves the electrolysis effect. In this invention, the electrolytic cell 1 is divided by a partition 2 to form multiple electrolytic chambers 3. Each electrolytic chamber 3 forms an independent electrolytic unit. In conjunction with the concentrated brine inlet main pipe 17, aqueous solution inlet main pipe 18, inlet branch pipe 19, dilute brine outlet main pipe 21, sodium hydroxide outlet main pipe 22, outlet branch pipe 23, hydrogen outlet main pipe 25, chlorine outlet main pipe 26, and outlet branch pipe 27, it is possible to replace the electrolytic unit in one electrolytic chamber 3 individually when a problem occurs. Through the cooperation of the inlet valve 20, outlet valve 24, and outlet valve 28, the inlet, outlet, and outlet operations in each electrolytic chamber 3 can be controlled independently. This allows for partial shutdown during maintenance without affecting the operation of other electrolytic units, avoiding the need for a complete shutdown during maintenance in existing technologies. In this invention, a mesh support frame 5 is provided on both sides of the ion exchange membrane 4. This strengthens the support of the ion exchange membrane 4 and prevents wrinkles caused by electrolyte impact. At the same time, the mesh support frame 5 is detachably installed in the electrolytic cell 1 in conjunction with the fixing groove 6. This facilitates the replacement of components such as the ion exchange membrane 4 in the future. The two sets of mesh support frames 5 can be connected and fixed by existing connection methods such as bolt locking or interference fit. Meanwhile, in this invention, the anode plate 8 and the cathode plate 7 are installed on both sides of the mesh support frame 5 through the cooperation of the insulating mounting plate 29 and the clamping plate 31. In this way, small electrode spacing can be achieved, the overall volume can be reduced, and the electrolysis efficiency of the electrolyte can be improved.

[0026] All parts not described in this utility model are implemented using existing technologies. In particular, the installation of the top cover structure of the electrolytic cell, and the connection of the electrode structures such as the anode and cathode plates, are all existing technologies, and will not be described in detail in comparison with this utility model.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ion-exchange membrane caustic soda electrolysis apparatus, comprising an electrolytic cell (1), characterized in that: Multiple partitions (2) are installed inside the electrolytic cell (1). The inner cavity of the electrolytic cell (1) is divided into multiple electrolytic chambers (3) by the partitions (2). An ion membrane (4) is provided in each electrolytic chamber (3). The ion membrane (4) divides the electrolytic chamber (3) into an anode chamber and a cathode chamber. A mesh support frame (5) is provided on both sides of the ion membrane (4). A fixing groove (6) is provided on the inner wall of the electrolytic cell (1). The ion membrane (4) is fixed in the fixing groove (6) by the mesh support frame (5). A cathode plate (7) is provided in the cathode chamber. An anode plate (8) is provided in the anode chamber. A concentrated brine inlet pipe (9) is provided at the bottom of the side wall of each anode chamber. An aqueous solution inlet pipe (10) is provided at the bottom of the side wall of each cathode chamber. A spray assembly is provided at the tail end of the concentrated brine inlet pipe (9) and the aqueous solution inlet pipe (10).

2. The ion-exchange membrane caustic soda electrolysis apparatus according to claim 1, characterized in that: The spray assembly includes a spray pipe (11) on which a plurality of spray heads (12) are uniformly arranged, and the spray heads (12) are arranged toward the corresponding anode plate (8) and cathode plate (7).

3. The ion-exchange membrane caustic soda electrolysis apparatus according to claim 1, characterized in that: A brine outlet pipe (13) is provided at the top of the side wall of the anode cavity, a chlorine outlet pipe (14) is provided at the top of the anode cavity, a sodium hydroxide solution outlet pipe (15) is provided at the top of the side wall of the cathode cavity, and a hydrogen outlet pipe (16) is provided at the top of the cathode cavity.

4. The ion-exchange membrane caustic soda electrolysis apparatus according to claim 1, characterized in that: The electrolytic cell (1) is provided with a concentrated brine inlet main pipe (17) and an aqueous solution inlet main pipe (18) on its outer side. Both the concentrated brine inlet main pipe (17) and the aqueous solution inlet main pipe (18) are provided with multiple inlet branch pipes (19). The inlet branch pipes (19) are connected to the corresponding concentrated brine inlet pipe (9) and aqueous solution inlet pipe (10). Each inlet branch pipe (19) is provided with an inlet valve (20).

5. The ion-exchange membrane caustic soda electrolysis apparatus according to claim 3, characterized in that: The electrolytic cell (1) is provided with a brine outlet main pipe (21) and a sodium hydroxide outlet main pipe (22) on its outer side. Both the brine outlet main pipe (21) and the sodium hydroxide outlet main pipe (22) are provided with outlet branch pipes (23). The outlet branch pipes (23) are connected to the corresponding brine outlet pipes (13) and sodium hydroxide solution outlet pipes (15). Each outlet branch pipe (23) is provided with an outlet valve (24).

6. The ion-exchange membrane caustic soda electrolysis apparatus according to claim 3, characterized in that: The electrolytic cell (1) is provided with a hydrogen gas outlet main pipe (25) and a chlorine gas outlet main pipe (26) on its outer side. Each of the hydrogen gas outlet main pipes (25) is provided with a gas outlet branch pipe (27). The gas outlet branch pipe (27) is connected to the corresponding hydrogen gas outlet pipe (16) and chlorine gas outlet pipe (14). Each of the gas outlet branch pipes (27) is provided with a gas outlet valve (28).

7. The ion-exchange membrane caustic soda electrolysis apparatus according to claim 1, characterized in that: Insulating mounting plates (29) are provided on both sides of the mesh support frame (5). The insulating mounting plates (29) are provided with mounting grooves (30). The anode plate (8) and cathode plate (7) are installed in the corresponding mounting grooves (30). The outer side of the anode plate (8) and cathode plate (7) is provided with clamping plates (31). The clamping plates (31) pass through the insulating mounting plates (29) and are fixed to the mesh support frame (5) by bolts.

8. The ion-exchange membrane caustic soda electrolysis apparatus according to claim 1, characterized in that: A sealing gasket (32) is provided between the inner side of the mesh support frame (5) and the ion membrane (4), and between the outer side of the mesh support frame (5) and the fixing groove (6).

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