A multi-cell continuous electrolysis apparatus

Abstract

The utility model discloses a kind of multiple electrolytic cell continuous electrolysis devices, including the hydrogen fluoride storage tank of weighing module, the output end of hydrogen fluoride storage tank is connected with first output pump, the output end of first output pump is connected with first adding pipe and second adding pipe, the output end of first adding pipe is connected with first shunt branch and second shunt branch, the output end of first shunt branch is connected with first electrolytic cell, the output end of first electrolytic cell is connected with first output valve, the output end of second shunt branch is connected with second electrolytic cell, the output end of second electrolytic cell is connected with second output valve, the output end of first output valve and second output valve is connected with electrolyte receiving tank, the output end of electrolyte receiving tank is connected with second output pump, the output end of second output pump is sequentially connected with third flowmeter and third total valve, the output end of third total valve is connected with third electrolytic cell, the output end of third electrolytic cell is connected with product tank with liquid level meter.

Description

Technical Field

[0001] This utility model belongs to the field of continuous electrolytic fluorination technology, specifically relating to a multi-electrolytic cell continuous electrolysis device. Background Technology

[0002] Electrolytic fluorination technology, as an important chemical production method, plays a crucial role in the synthesis of organofluorine compounds. However, most current electrolytic fluorination units use single-cell electrolytic processes. During electrolytic fluorination, the electrodes are exposed to a highly corrosive, high-current-density environment, making them prone to aging phenomena such as electrode surface passivation and loss of active ingredients. When the electrodes age to a certain extent and can no longer meet production requirements, the entire electrolysis unit must be shut down for repair or replacement. This not only forces production to stop, severely impacting production efficiency and continuous product supply, but also consumes significant time and effort for each shutdown and restart, resulting in idle equipment and wasted personnel, and substantially increasing production costs. Furthermore, the shutdown and subsequent restart processes may pose operational risks, threatening operator safety and potentially causing adverse environmental impacts. Therefore, a multi-cell continuous electrolysis unit is urgently needed to address these issues. Utility Model Content

[0003] In view of the problems raised in the background art above, the purpose of this utility model is to provide a multi-electrolytic cell continuous electrolysis device.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0005] A multi-electrolytic cell continuous electrolysis device includes a hydrofluoric acid storage tank with a weighing module. The output end of the hydrofluoric acid storage tank is connected to a first output pump. The output end of the first output pump is connected to a first addition pipe and a second addition pipe. A first flow meter and a first main valve are installed on the first addition pipe. A second flow meter and a second main valve are installed on the second addition pipe. The output end of the first addition pipe is connected to a first branch pipe and a second branch pipe. A first control valve is installed on the first branch pipe, and a second control valve is installed on the second branch pipe. The output end of the first branch pipe is connected to a first electrolytic cell. The output end of the first electrolytic cell is connected to a first output valve, and the output end of the second branch pipe is connected to a second... An electrolytic cell is provided. The output end of the second electrolytic cell is connected to a second output valve. The output ends of the first and second output valves are connected to an electrolyte receiving tank. The output end of the electrolyte receiving tank is connected to a second output pump. The output end of the second output pump is sequentially connected to a third flow meter and a third main valve. The output end of the third main valve is connected to a third electrolytic cell. The output end of the second adding pipe is connected to the third electrolytic cell. The output end of the third electrolytic cell is connected to a product tank with a level gauge. The first, second, and third electrolytic cells are all connected to tail gas output pipes. The output ends of the tail gas output pipes are connected to two sets of condensers. The input ends of the first and second electrolytic cells are also equipped with sulfolane feeding mechanisms.

[0006] Furthermore, the output ends of both sets of condensers are equipped with reflux pipes and exhaust pipes, with the output end of the reflux pipe connected to a hydrofluoric acid storage tank. This structural design facilitates the discharge of treated exhaust gas and its secondary utilization.

[0007] Further specifying, the sulfolane feeding mechanism includes a sulfolane storage tank, the output end of which is connected to a third output pump. The output end of the third output pump is connected to a main channel, on which a fourth flow meter and a fourth main valve are installed. The output end of the main channel is connected to a first branch pipe and a second branch pipe. A primary switching valve is installed on the first branch pipe, and its output end is connected to a first electrolytic cell. A secondary switching valve is installed on the second branch pipe, and its output end is connected to a second electrolytic cell. This structural design facilitates the addition of sulfolane for electrolysis.

[0008] Furthermore, the main channel, the first branch pipe, and the second branch pipe are all equipped with insulation pipes on their outer sides, and these insulation pipes are filled with hot water. This structural design maintains the temperature during the feeding process.

[0009] Further specifying, it also includes a nitrogen main pipe, the output end of which is connected to a first nitrogen branch pipe, a second nitrogen branch pipe, and a third nitrogen branch pipe. A first nitrogen control valve is installed on the first nitrogen branch pipe, and its output end is connected to a first electrolytic cell. A second nitrogen control valve is installed on the second nitrogen branch pipe, and its output end is connected to a second electrolytic cell. A third nitrogen control valve is installed on the third nitrogen branch pipe, and its output end is connected to a third electrolytic cell. With this structural design, the electrolytic cell is purged with nitrogen before use.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model adopts a multi-electrolytic cell collaborative working mode. The first and second electrolytic cells can operate alternately. When any electrolytic cell needs to be shut down for electrode maintenance or replacement, it can be quickly switched to another electrolytic cell to continue feeding and electrolysis by switching the control valve, without interrupting the entire production process. This "non-stop continuous" design completely avoids production interruptions caused by shutdown maintenance in traditional single-cell devices, significantly improving production efficiency while ensuring continuous product supply to meet the stable needs of downstream production.

[0012] 2. This utility model eliminates the need for frequent shutdowns and restarts through alternating operation of multiple tanks, significantly reducing equipment downtime and redundant personnel consumption. Furthermore, precise control components such as the sulfolane feeding mechanism and hydrofluoric acid replenishment system can flexibly adjust the raw material supply according to the electrolysis progress, avoiding material waste and further reducing raw material costs and overall production costs.

[0013] 3. This utility model effectively removes residual gas in the tanks through nitrogen purging pretreatment (three nitrogen purgings are performed on each tank before electrolysis), reducing the operational risks during the electrolysis process. The tail gas treatment system uses two sets of condensers to recover and treat HF ​​gas, reducing the direct emission of harmful gases and their impact on the environment. At the same time, the continuous production mode reduces the risk of operational errors that may be caused by shutdown and restart, providing a safer working environment for operators. Attached Figure Description

[0014] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0015] Figure 1 This is a schematic diagram of the structure of a multi-electrolytic cell continuous electrolysis device according to an embodiment of the present invention;

[0016] The symbols for the main components are explained below:

[0017] Hydrofluoric acid storage tank 1, first output pump 2, first inlet pipe 3, second inlet pipe 4, first flow meter 5, first main valve 6, second flow meter 7, second main valve 8, first branch pipe 9, second branch pipe 10, first control valve 11, second control valve 12, first electrolytic cell 13, first output valve 14, second electrolytic cell 15, second output valve 16, electrolyte receiving tank 17, second output pump 18, third flow meter 19, third main valve 20, third electrolytic cell 21, product tank 22 23. Exhaust gas output pipe, 24. Condenser, 25. Return pipe, 26. Exhaust gas discharge pipe, 27. Sulfadiazine storage tank, 28. Third output pump, 29. Main channel, 30. Fourth flow meter, 31. Fourth main valve, 32. First branch pipe, 33. Second branch pipe, 34. First stage switch valve, 35. Second stage switch valve, 36. Nitrogen main pipe, 37. First nitrogen branch pipe, 38. Second nitrogen branch pipe, 39. Third nitrogen branch pipe, 40. First nitrogen control valve, 41. Second nitrogen control valve, 42. Third nitrogen control valve. Detailed Implementation

[0018] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Example 1, as Figure 1 As shown, a multi-electrolytic cell continuous electrolysis device includes a hydrofluoric acid storage tank 1 with its output end connected to a first output pump 2. The output end of the first output pump 2 is connected to a first addition pipe 3 and a second addition pipe 4. A first flow meter 5 and a first main valve 6 are installed on the first addition pipe 3. A second flow meter 7 and a second main valve 8 are installed on the second addition pipe 4. The output end of the first addition pipe 3 is connected to a first branch pipe 9 and a second branch pipe 10. A first control valve 11 is installed on the first branch pipe 9, and a second control valve 12 is installed on the second branch pipe 10. The output end of the first branch pipe 9 is connected to a first electrolytic cell 13, and the output end of the first electrolytic cell 13 is connected to a first output valve 14. The output end of the second branch pipe 10 is connected to a second electrolytic cell 15. The output of the second electrolytic cell 15... The first electrolytic cell 13, the second electrolytic cell 15, and the third electrolytic cell 21 are all connected to an electrolyte receiving tank 17. The output end of the electrolyte receiving tank 17 is connected to a second output pump 18. The output end of the second output pump 18 is connected to a third flow meter 19 and a third main valve 20 in sequence. The output end of the third main valve 20 is connected to a third electrolytic cell 21. The output end of the second adding pipe 4 is connected to the third electrolytic cell 21. The output end of the third electrolytic cell 21 is connected to a product tank 22 with a level gauge. The first electrolytic cell 13, the second electrolytic cell 15, and the third electrolytic cell 21 are all connected to a tail gas output pipe 23. The output end of the tail gas output pipe 23 is connected to two sets of condensers 24. The input ends of the first electrolytic cell 13 and the second electrolytic cell 15 are also equipped with sulfolane feeding mechanisms.

[0020] In this embodiment, during use, hydrofluoric acid is output from the hydrofluoric acid storage tank 1 equipped with a weighing module, and then input into the first addition pipe 3 via the first output pump 2. The first main valve 6 is opened, and after being metered by the first flow meter 5, the hydrofluoric acid is input into the first branch pipe 9 and the second branch pipe 10. The first control valve 11 and the second control valve 12 are then opened to enter the first electrolytic cell 13 and the second electrolytic cell 15. During this process, the temperature is controlled below 10°C, the current is set below 100A, and the current change is observed. Once the current drops below 30A, sulfolane is added to the first electrolytic cell 13 and the second electrolytic cell 15 via the sulfolane feeding mechanism for electrolysis. There is a periodic induction period initially. Once the induction period is stable, the first output valve 14 and the second output valve 16 are opened. The electrolyte in the first electrolytic cell 13 and the second electrolytic cell 15 is transferred to the electrolyte receiving tank 17, and then transferred to the third electrolytic cell 21 for electrolysis by the second output pump 18. When the electrolyte is transferred to the third electrolytic cell 21, the third main valve 20 is opened, and the electrolyte is metered by the third flow meter 19 and enters the third electrolytic cell 21. If the electrolysis is incomplete, the second main valve 8 is opened, so that the hydrofluoric acid is metered by the second flow meter 7 on the second addition pipe 4 and enters the third electrolytic cell 21 to achieve the effect of adding hydrogen fluoride for electrolysis. After the electrolysis is completed, the third electrolytic cell 21 delivers the product to the product tank 22 with a level gauge. The HF gas generated during the electrolysis process is delivered to the two sets of condensers 24 for treatment through the tail gas output pipe 23.

[0021] When the first electrolytic cell 13 is not in use, the first control valve 11 and the first output valve 14 are closed, and the second control valve 12 is opened to feed material into the second electrolytic cell 15. When the second electrolytic cell 15 is not in use, the first control valve 11 and the first output valve 14 are opened, and the second control valve 12 and the second output valve 16 are closed. Material is then fed into the first electrolytic cell 13 for electrolysis. Other processes are the same as described above, thereby achieving continuous electrolysis without stopping production.

[0022] Example 2, as Figure 1 As shown, this embodiment adds the following structure to the embodiment 1: the output ends of the two sets of condensers 24 are provided with reflux pipes 25 and tail gas discharge pipes 26, and the output end of the reflux pipes 25 is connected to the hydrofluoric acid storage tank 1.

[0023] In this embodiment, during use, the two sets of condensers 24 process the HF gas to form a hydrofluoric acid solution. The hydrofluoric acid solution is fed into the hydrofluoric acid storage tank 1 through the return pipe 25 for use, while the generated waste gas is discharged from the tail gas discharge pipe 26 for subsequent treatment and purification.

[0024] Example 3, as Figure 1As shown, this embodiment adds the following structure based on embodiment 1: the sulfolane feeding mechanism includes a sulfolane storage tank 27, the output end of the sulfolane storage tank 27 is connected to a third output pump 28, the output end of the third output pump 28 is connected to a main channel 29, a fourth flow meter 30 and a fourth main valve 31 are installed on the main channel 29, the output end of the main channel 29 is connected to a first branch pipe 32 and a second branch pipe 33, a first-stage switching valve 34 is installed on the first branch pipe 32, the output end of the first branch pipe 32 is connected to the first electrolytic cell 13, a second-stage switching valve 35 is installed on the second branch pipe 33, and the output end of the second branch pipe 33 is connected to the second electrolytic cell 15.

[0025] In this embodiment, during use, the fourth main valve 31, the first-stage switching valve 34, and the second-stage switching valve 35 are opened, so that the sulfolane in the sulfolane storage tank 27 is output into the main channel 29 through the third output pump 28, and after being measured by the fourth flow meter 30, it is respectively input into the first branch pipe 32 and the second branch pipe 33, and then input into the first electrolytic cell 13 and the second electrolytic cell 15 for electrolysis through the first branch pipe 32 and the second branch pipe 33.

[0026] When the first electrolytic cell 13 is not in use, the first stage switch valve 34 is closed and the second stage switch valve 35 is opened to feed material into the second electrolytic cell 15. When the second electrolytic cell 15 is not in use, the first stage switch valve 34 is opened and the second stage switch valve 35 is closed, and material is fed into the first electrolytic cell 13 for electrolysis. Other processes are the same as above, thereby realizing continuous electrolysis without stopping production.

[0027] Example 4, as Figure 1 As shown, this embodiment adds the following structure to embodiment 3: Insulation pipes are installed on the outer sides of the main channel 29, the first branch pipe 32, and the second branch pipe 33, and the insulation pipes are filled with hot water. This structural design maintains the temperature during the feeding process.

[0028] In this embodiment, during the feeding process, the main channel 29, the first branch pipe 32 and the second branch pipe 33 are kept at a temperature above 35°C. Hot water insulation measures are adopted, and hot water is filled into the insulation pipe to achieve the insulation effect.

[0029] Example 5, as Figure 1As shown, this embodiment adds the following structure to the original embodiment 1, including a nitrogen main pipe 36. The output end of the nitrogen main pipe 36 is connected to a first nitrogen branch pipe 37, a second nitrogen branch pipe 38, and a third nitrogen branch pipe 39. A first nitrogen control valve 40 is installed on the first nitrogen branch pipe 37, and the output end of the first nitrogen branch pipe 37 is connected to the first electrolytic cell 13. A second nitrogen control valve 41 is installed on the second nitrogen branch pipe 38, and the output end of the second nitrogen branch pipe 38 is connected to the second electrolytic cell 15. A third nitrogen control valve 42 is installed on the third nitrogen branch pipe 39, and the output end of the third nitrogen branch pipe 39 is connected to the third electrolytic cell 21.

[0030] In this embodiment, before electrolysis, all feed lines are closed, and the first nitrogen control valve 40, the second nitrogen control valve 41, and the third nitrogen control valve 42 are opened, allowing nitrogen to flow through the main nitrogen pipe 36 into the first nitrogen branch pipe 37, the second nitrogen branch pipe 38, and the third nitrogen branch pipe 39 respectively. Finally, nitrogen is output from the first nitrogen branch pipe 37, the second nitrogen branch pipe 38, and the third nitrogen branch pipe 39 into the first electrolytic cell 13, the second electrolytic cell 15, and the third electrolytic cell 21. After purging three times, the first nitrogen control valve 40, the second nitrogen control valve 41, and the third nitrogen control valve 42 are closed, and all feed lines are opened to start the electrolysis operation.

[0031] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A multi-electrolytic cell continuous electrolysis device, comprising a hydrofluoric acid storage tank (1) with a weighing module, characterized in that: The output end of the hydrofluoric acid storage tank (1) is connected to a first output pump (2). The output end of the first output pump (2) is connected to a first addition pipe (3) and a second addition pipe (4). A first flow meter (5) and a first main valve (6) are installed on the first addition pipe (3). A second flow meter (7) and a second main valve (8) are installed on the second addition pipe (4). The output end of the first addition pipe (3) is connected to a first branch pipe (9) and a second branch pipe (10). A first control valve (11) is installed on the first branch pipe (9). A second control valve (12) is installed on the second branch pipe (10). The output end of the first branch pipe (9) is connected to a first electrolytic cell (13). The output end of the first electrolytic cell (13) is connected to a first output valve (14). The output end of the second branch pipe (10) is connected to a second electrolytic cell (15). The output end of the second electrolytic cell (15) is connected to... There is a second output valve (16). The output ends of the first output valve (14) and the second output valve (16) are connected to an electrolyte receiving tank (17). The output end of the electrolyte receiving tank (17) is connected to a second output pump (18). The output end of the second output pump (18) is connected to a third flow meter (19) and a third main valve (20) in sequence. The output end of the third main valve (20) is connected to a third electrolytic cell (21). The output end of the second adding pipe (4) is connected to the third electrolytic cell (21). The output end of the third electrolytic cell (21) is connected to a product tank (22) with a level gauge. The first electrolytic cell (13), the second electrolytic cell (15) and the third electrolytic cell (21) are all connected to a tail gas output pipe (23). The output end of the tail gas output pipe (23) is connected to two sets of condensers (24). The input ends of the first electrolytic cell (13) and the second electrolytic cell (15) are also equipped with sulfolane feeding mechanisms.

2. The multi-electrolytic cell continuous electrolysis device according to claim 1, characterized in that: The output ends of the two sets of condensers (24) are provided with a return pipe (25) and a tail gas discharge pipe (26), and the output end of the return pipe (25) is connected to the hydrofluoric acid storage tank (1).

3. The multi-electrolytic cell continuous electrolysis apparatus according to claim 2, characterized in that: The sulfolane feeding mechanism includes a sulfolane storage tank (27), the output end of which is connected to a third output pump (28), the output end of which is connected to a main channel (29), a fourth flow meter (30) and a fourth main valve (31) are installed on the main channel (29), the output end of which is connected to a first branch pipe (32) and a second branch pipe (33), a first-stage switching valve (34) is installed on the first branch pipe (32), the output end of which is connected to a first electrolytic cell (13), a second-stage switching valve (35) is installed on the second branch pipe (33), and the output end of which is connected to a second electrolytic cell (15).

4. The multi-electrolytic cell continuous electrolysis device according to claim 3, characterized in that: The main channel (29), the first branch pipe (32), and the second branch pipe (33) are all equipped with heat-insulating pipes, which are filled with hot water.

5. A multi-electrolytic cell continuous electrolysis apparatus according to claim 4, characterized in that: It also includes a nitrogen main pipe (36), the output end of which is connected to a first nitrogen branch pipe (37), a second nitrogen branch pipe (38) and a third nitrogen branch pipe (39). A first nitrogen control valve (40) is installed on the first nitrogen branch pipe (37), and the output end of the first nitrogen branch pipe (37) is connected to the first electrolytic cell (13). A second nitrogen control valve (41) is installed on the second nitrogen branch pipe (38), and the output end of the second nitrogen branch pipe (38) is connected to the second electrolytic cell (15). A third nitrogen control valve (42) is installed on the third nitrogen branch pipe (39), and the output end of the third nitrogen branch pipe (39) is connected to the third electrolytic cell (21).

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