Electrolytic cell for the preparation of perfluorotributylamine

Abstract

The utility model discloses a perfluorotributylamine preparation electrolytic cell belongs to perfluorotributylamine preparation technical field, including electrolytic cell, the end of electrolytic cell is provided with the processing tower perpendicularly, and the bottom of processing tower is equipped with the gas guide pipe between electrolytic cell's top cover, and the middle position of processing tower inside is provided with the baffle horizontally. The utility model discloses through being provided with water absorption cavity, lye shower cavity and activated carbon plate in the inside of processing tower, adopts three -level processing system, utilizes HF easily soluble in water's characteristic, can fastly absorb the most HF in tail gas and generates hydrofluoric acid through water absorption cavity, avoids HF direct contact subsequent equipment or being adsorbed by activated carbon, after water absorption, the HF, fluorine substitution hydrocarbon decomposition product etc. Acidic gas remaining in tail gas can be neutralized completely by NaOH solution again, finally utilizes activated carbon plate and only needs to handle residual tributylamine, fluorine substitution hydrocarbon etc. Organic vapor, and the efficiency of pollutant removal is improved in the specific stage treatment.

Description

Technical Field

[0001] This utility model relates to an electrolytic cell, and more particularly to an electrolytic cell for the preparation of perfluorotributylamine, belonging to the field of perfluorotributylamine preparation technology. Background Technology

[0002] Currently, waste gas, such as hydrogen fluoride, is generated during the electrolysis process. The exhaust pipes at the top of some electrolytic cells are connected to a treatment box, which contains adsorption materials such as activated carbon plates to filter the waste gas and prevent environmental pollution and harm to human health.

[0003] However, when using a single activated carbon adsorption box to treat complex exhaust gases, the activated carbon needs to be replaced frequently, resulting in high operating costs. Furthermore, if HF in the exhaust gas enters the activated carbon adsorption box directly without being treated by the water tower and alkali tower, it will corrode the metal frame and seals of the adsorption box (HF is highly corrosive to both carbon steel and stainless steel), leading to equipment leakage and affecting the safety of use. In addition, current environmental regulations require that industrial exhaust gases not only contain HF, but also include VOCs (such as tributylamine) and fluorinated hydrocarbons. A single activated carbon adsorption box is difficult to meet the removal requirements of multiple pollutants at the same time, especially since the removal rate of HF is insufficient (usually <50%), which will lead to emissions exceeding standards.

[0004] To address these issues, a perfluorotributylamine preparation electrolytic cell was designed. Utility Model Content

[0005] The main objective of this invention is to provide an electrolytic cell for the preparation of perfluorotributylamine, in order to solve the problems mentioned in the background art.

[0006] The objective of this utility model can be achieved by adopting the following technical solution:

[0007] An electrolytic cell for preparing perfluorotributylamine includes an electrolytic cell with a vertically mounted treatment tower at one end. A gas guide pipe is provided between the bottom of the treatment tower and the top cover of the electrolytic cell. A baffle is horizontally mounted in the middle of the interior of the treatment tower. A water absorption chamber is located below the baffle, and an alkali spray chamber is located at the top of the baffle. A vertically mounted through pipe is provided on the baffle, and a leak-proof cover is provided at the top of the through pipe. Liquid pumps are provided on the outside of both the water absorption chamber and the alkali spray chamber. Spray plates are provided at the top of both the water absorption chamber and the alkali spray chamber. The output ends of the liquid pumps are connected to the spray plates. An activated carbon plate is horizontally mounted at the top of the interior of the treatment tower, and an exhaust port is opened at the top of the treatment tower.

[0008] A turbulence-inducing mechanism is provided between the water absorption chamber and the alkaline spray chamber to agitate the aqueous solution and gas.

[0009] Preferably, a hollow disk is horizontally fixed at the bottom of the water absorption chamber, the bottom end of the air guide tube is connected to the interior of the hollow disk, and air holes are evenly opened on the top of the hollow disk.

[0010] Preferably, the spray plate includes a hollow inner ring, a hollow outer ring, a straight pipe, and a nozzle. The hollow inner ring is horizontally arranged inside the water absorption chamber and the alkaline spray chamber. A hollow outer ring is sleeved on the outside of the hollow inner ring. A straight pipe is provided between the hollow outer ring and the hollow inner ring. The hollow outer ring is fixed on the inner wall of the water absorption chamber and the alkaline spray chamber. A nozzle is provided at the bottom of both the hollow outer ring and the hollow inner ring. The output end of the liquid pump is connected to the hollow outer ring through a conduit.

[0011] Preferably, the top of the treatment tower is horizontally provided with an installation ring, the inside of the installation ring is provided with a slot, the activated carbon plate is located inside the slot, the side of the installation ring is provided with an installation port, and the top of the side of the treatment tower is provided with a door panel at the position corresponding to the installation port.

[0012] Preferably, the turbulence mechanism includes a stirring motor, a stirring shaft, stirring blades, and fan blades. The stirring motor is installed at the bottom of the water absorption chamber. The stirring shaft is vertically installed at the output end of the stirring motor. The stirring shaft passes through the through pipe and extends to the top of the through pipe. Fan blades are installed at the top of the through pipe. Stirring blades are installed at the bottom of the stirring shaft, and the stirring blades are located inside the aqueous solution.

[0013] Preferably, the stirring blades are provided with four sets of sides perpendicular to the stirring shaft, and the stirring blades are arranged in a ring array.

[0014] Preferably, both the water absorption chamber and the alkaline spray chamber have transparent windows on their outer sides, and both the water absorption chamber and the alkaline spray chamber have discharge pipes at their bottom outer sides.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model employs a three-stage treatment system, consisting of a water absorption chamber, an alkaline spray chamber, and an activated carbon plate inside the treatment tower. Utilizing the water-soluble nature of HF, most of the HF in the exhaust gas is quickly absorbed by the water absorption chamber to generate hydrofluoric acid, preventing HF from directly contacting subsequent equipment or being adsorbed by the activated carbon. After water absorption, residual HF and acidic gases such as fluorinated hydrocarbon decomposition products (e.g., COF2) in the exhaust gas can be completely neutralized again by NaOH solution. Finally, the activated carbon plate only needs to treat residual tributylamine, fluorinated hydrocarbons, and other organic vapors. This targeted, staged treatment improves pollutant removal efficiency and eliminates the need for frequent activated carbon plate replacement, reducing activated carbon consumption costs. Furthermore, the generated hydrofluoric acid can be concentrated and used for electrolyte preparation in electrolytic cells or sold as a fluoride raw material, creating added value through recycling and offering higher cost-effectiveness.

[0017] 2. This utility model uses a turbulence mechanism composed of a stirring motor, stirring shaft, stirring blades, and fan blades, which can not only accelerate the flow rate of water at the bottom of the water absorption chamber and improve the dissolution effect of HF, but also accelerate the diffusion rate of gas in the alkaline spray chamber and improve the neutralization effect, making it more practical. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention;

[0019] Figure 2 This is a cross-sectional view of the internal structure of the processing tower of this utility model;

[0020] Figure 3 This is a partial structural diagram of the top of the water absorption chamber of this utility model;

[0021] Figure 4 This is a diagram of the turbulence mechanism of this utility model.

[0022] In the diagram: 1. Electrolytic cell; 2. Processing tower; 3. Gas delivery pipe; 4. Baffle plate;

[0023] 5. Water absorption chamber; 501. Hollow disc; 502. Air vent;

[0024] 6. Alkali spray chamber; 7. Connecting pipe; 8. Leak-proof cover;

[0025] 9. Turbulence mechanism; 901. Agitator motor; 902. Agitator shaft; 903. Agitator blades; 904. Fan blades;

[0026] 10. Liquid pump; 11. Sprayer tray;

[0027] 12. Activated carbon plate; 1201. Mounting ring; 1202. Slot;

[0028] 13. Exhaust port. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0030] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Example 1

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment proposes an electrolytic cell for the preparation of perfluorotributylamine, including an electrolytic cell 1, a processing tower 2 vertically provided at the end of the electrolytic cell 1, a gas guide pipe 3 provided between the bottom end of the processing tower 2 and the top cover of the electrolytic cell 1, a partition 4 horizontally provided at the middle position inside the processing tower 2, a water absorption chamber 5 provided below the partition 4, an alkaline spray chamber 6 provided at the top of the partition 4, a through pipe 7 vertically provided on the partition 4, a leak-proof cover 8 provided at the top of the through pipe 7, a liquid pump 10 provided on the outside of both the water absorption chamber 5 and the alkaline spray chamber 6, a spray plate 11 provided at the top inside both the water absorption chamber 5 and the alkaline spray chamber 6, the output end of the liquid pump 10 is connected to the spray plate 11 respectively, an activated carbon plate 12 is horizontally provided at the top inside the processing tower 2, and an exhaust port 13 is opened at the top of the processing tower 2.

[0036] A turbulence mechanism 9 is provided between the water absorption chamber 5 and the alkaline spray chamber 6 to agitate the aqueous solution and gas.

[0037] Waste gas (such as HF, VOCs, etc.) generated during the electrolytic reaction of perfluorotributylamine preparation in electrolytic cell 1 enters the water absorption chamber 5 of treatment tower 2 through the top gas guide pipe 3. It first contacts the water at the bottom of the water absorption chamber 5. Utilizing the characteristic that HF ​​is easily soluble in water, the aqueous solution in the water absorption chamber 5 initially absorbs the HF in the waste gas (generating hydrofluoric acid), reducing the corrosion of the equipment by subsequent acidic gases. Then, the liquid pump 10 outside the water absorption chamber 5 draws the aqueous solution from the chamber to the top spray plate 11, forming a "top-down" liquid curtain that contacts the "bottom-up" waste gas in the opposite direction, significantly improving the HF absorption efficiency. Simultaneously, the turbulence mechanism 9 agitates the aqueous solution in the water absorption chamber 5, breaking the static state of the liquid and allowing the bubbles to fully mix with the water, further increasing the HF dissolution rate. The waste gas treated by the water absorption chamber 5... The gas (containing residual traces of HF and acidic gases such as COF2 from the decomposition of fluorinated hydrocarbons) enters the alkaline spray chamber 6 through the pipe 7 on the partition 4. The leak-proof cover 8 at the top of the pipe 7 prevents the liquid from dripping into the water absorption chamber 5 during alkaline spraying, avoiding solution mixing and contamination. The liquid pump 10 outside the alkaline spray chamber 6 draws the alkaline solution (such as NaOH solution) from the chamber to the top spray plate 11, where it undergoes a neutralization reaction with the acidic gases in the waste gas (e.g., HF + NaOH = NaF + H2O), thoroughly removing residual acidic substances. The turbulence mechanism 9 agitates the gas in the alkaline spray chamber 6, breaking up gas stratification and ensuring full contact between the waste gas and the alkaline solution, improving neutralization efficiency. The waste gas, after being neutralized by the alkaline solution, rises to the top of the treatment tower 2 and undergoes final purification through the activated carbon plate 12, adsorbing residual tributylamine, fluorinated hydrocarbons, and other organic vapors in the waste gas. The purified clean gas is discharged through the exhaust port 13 at the top of the treatment tower 2.

[0038] Example 2

[0039] The solution in Example 1 will be further described below with reference to its specific working method.

[0040] like Figure 2 As shown, in a preferred embodiment, based on the above method, a hollow disk 501 is horizontally fixed at the bottom of the water absorption chamber 5. The bottom end of the air guide pipe 3 is connected to the interior of the hollow disk 501. Air holes 502 are evenly opened on the top of the hollow disk 501. The waste gas first enters the hollow disk 501 at the bottom of the water absorption chamber 5. The air holes 502 evenly opened on the top of the hollow disk 501 disperse the waste gas into fine bubbles, increasing the contact area between the waste gas and water, and laying the foundation for subsequent efficient absorption.

[0041] like Figure 2As shown, in a preferred embodiment, based on the above method, the spray plate 11 further includes a hollow inner ring, a hollow outer ring, a straight pipe, and nozzles. The hollow inner ring is horizontally disposed inside the water absorption chamber 5 and the alkaline spray chamber 6. A hollow outer ring is sleeved on the outside of the hollow inner ring. A straight pipe is provided between the hollow outer ring and the hollow inner ring. The hollow outer ring is fixed on the inner wall of the water absorption chamber 5 and the alkaline spray chamber 6. Nozzles are provided at the bottom of both the hollow outer ring and the hollow inner ring. The output end of the liquid pump 10 is connected to the hollow outer ring through a conduit. The liquid flows from the hollow outer ring into the hollow inner ring through the straight pipe and is finally sprayed evenly downwards through the nozzles at the bottom of the inner and outer rings to form a "top-down" liquid curtain that contacts the "bottom-up" exhaust gas in the opposite direction.

[0042] like Figure 3 As shown, in a preferred embodiment, based on the above method, a mounting ring 1201 is horizontally provided at the inner top of the treatment tower 2. A slot 1202 is provided inside the mounting ring 1201, and the activated carbon plate 12 is located inside the slot 1202. An installation port is provided on the side of the mounting ring 1201, and a door plate is provided at the top of the side of the treatment tower 2 corresponding to the installation port. The activated carbon plate 12 can be easily replaced through the door plate on the side of the treatment tower 2 and the installation port of the mounting ring 1201 to ensure adsorption efficiency.

[0043] like Figure 4 As shown, in a preferred embodiment, based on the above method, the turbulence mechanism 9 further includes a stirring motor 901, a stirring shaft 902, stirring blades 903 and fan blades 904. The stirring motor 901 is installed at the bottom of the water absorption chamber 5. The stirring shaft 902 is vertically installed at the output end of the stirring motor 901. The stirring shaft 902 passes through the through pipe 7 and extends to the top of the through pipe 7. The fan blades 904 are installed at the top of the through pipe 7. The stirring blades 903 are installed at the bottom of the stirring shaft 902 and are located inside the aqueous solution.

[0044] The stirring motor 901 in the turbulence mechanism 9 drives the stirring shaft 902 to rotate. The stirring blades 903 at the bottom stir the aqueous solution in the water absorption chamber 5, breaking the static state of the liquid and making the bubbles and water fully mixed, further improving the dissolution rate of HF. The fan blades 904 rotate with the shaft to stir the gas in the alkaline spray chamber 6, breaking the gas stratification and making the waste gas and alkaline solution fully contact each other, thus improving the neutralization efficiency.

[0045] like Figure 4 As shown, in a preferred embodiment, based on the above method, the stirring blades 903 are further provided with four sets of sides perpendicular to the stirring shaft 902, and the stirring blades 903 are arranged in a ring array. The arrangement of multiple sets of stirring blades 903 can improve the stirring effect.

[0046] like Figure 1As shown, in a preferred embodiment, based on the above method, both the water absorption chamber 5 and the alkaline spray chamber 6 are provided with transparent windows on their outer sides, and both the water absorption chamber 5 and the alkaline spray chamber 6 are provided with discharge pipes at their bottom outer sides. The transparent windows on the outer sides of the water absorption chamber 5 and the alkaline spray chamber 6 allow for real-time observation of the liquid level and reaction status inside the chambers, and the discharge pipes at the bottom can periodically discharge the waste liquid after absorption / neutralization (such as hydrofluoric acid solution, which can be recycled for electrolyte preparation, and alkaline waste liquid, which is discharged after treatment).

[0047] Example 3

[0048] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.

[0049] Waste gas (such as HF, VOCs, etc.) generated during the electrolytic reaction in electrolytic cell 1 to prepare perfluorotributylamine enters the water absorption chamber 5 of treatment tower 2 through the top gas guide pipe 3. The waste gas first enters the hollow disk 501 at the bottom of the water absorption chamber 5. The uniformly opened pores 502 at the top of the hollow disk 501 disperse the waste gas into fine bubbles, increasing the contact area between the waste gas and water, laying the foundation for subsequent efficient absorption. Utilizing the characteristic that HF ​​is easily soluble in water, the aqueous solution in the water absorption chamber 5 performs preliminary absorption of HF in the waste gas (generating hydrofluoric acid), reducing the corrosion of the equipment by subsequent acidic gases. The liquid pump 10 outside the absorption chamber 5 draws the aqueous solution inside the chamber to the top spray plate 11. The spray plate 11 consists of a hollow inner ring, a hollow outer ring, a straight pipe, and nozzles. The liquid flows from the hollow outer ring into the hollow inner ring through the straight pipe, and finally is sprayed evenly downwards through the nozzles at the bottom of the inner and outer rings, forming a "top-down" liquid curtain that comes into counter-current contact with the "bottom-up" exhaust gas, significantly improving the absorption efficiency of HF. The stirring motor 901 in the turbulence mechanism 9 drives the stirring shaft 902 to rotate, and the stirring blades 903 at the bottom (four sets of blades arranged in a ring array) stir the aqueous solution in the water absorption chamber 5. The movement breaks the static state of the liquid, allowing the bubbles to mix fully with the water, further increasing the dissolution rate of HF. The waste gas (containing a small amount of residual HF and acidic gases such as COF2 from the decomposition of fluorinated hydrocarbons) after treatment in the water absorption chamber 5 enters the alkaline spray chamber 6 through the pipe 7 on the partition 4. The leak-proof cover 8 at the top of the pipe 7 prevents liquid from dripping into the water absorption chamber 5 during alkaline spraying, avoiding solution mixing and contamination. The liquid pump 10 outside the alkaline spray chamber 6 draws the alkaline solution (such as NaOH solution) from the chamber to the top spray plate 11, which then sprays through the same spray structure as the water absorption chamber 5 (hollow inner and outer rings +...). The nozzle forms a uniform liquid curtain, which neutralizes the acidic gases in the waste gas (e.g., HF + NaOH = NaF + H2O), thoroughly removing residual acidic substances. The stirring shaft 902 of the turbulence mechanism 9 extends to the top of the pipe 7, and the fan blades 904 at the top of the shaft rotate with the shaft to stir the gas in the alkaline spray chamber 6, breaking the gas stratification and allowing the waste gas to fully contact the alkaline solution, thereby improving the neutralization efficiency. The waste gas neutralized by the alkaline solution rises to the top of the treatment tower 2 and undergoes final purification through the activated carbon plate 12. The purified clean gas is discharged through the exhaust port 13 at the top of the treatment tower 2.

[0050] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. An electrolytic cell for the preparation of perfluorotributylamine, comprising an electrolytic cell (1), characterized in that: A treatment tower (2) is vertically installed at the end of the electrolytic cell (1). A gas guide pipe (3) is installed between the bottom end of the treatment tower (2) and the top cover of the electrolytic cell (1). A partition (4) is horizontally installed in the middle of the interior of the treatment tower (2). A water absorption chamber (5) is installed below the partition (4). An alkaline spray chamber (6) is installed at the top of the partition (4). A through pipe (7) is vertically installed on the partition (4). A leak-proof cover (8) is installed at the top of the through pipe (7). A liquid pump (10) is installed on the outside of both the water absorption chamber (5) and the alkaline spray chamber (6). A spray plate (11) is installed at the top of both the water absorption chamber (5) and the alkaline spray chamber (6). The output end of the liquid pump (10) is connected to the spray plate (11). An activated carbon plate (12) is horizontally installed at the top of the interior of the treatment tower (2). An exhaust port (13) is opened at the top of the treatment tower (2). A turbulence mechanism (9) is provided between the water absorption chamber (5) and the alkaline spray chamber (6) to agitate the aqueous solution and gas.

2. The electrolytic cell for preparing perfluorotributylamine according to claim 1, characterized in that: A hollow disk (501) is horizontally fixed at the bottom of the water absorption chamber (5). The bottom end of the air guide pipe (3) is connected to the interior of the hollow disk (501). Air holes (502) are evenly opened on the top of the hollow disk (501).

3. The electrolytic cell for preparing perfluorotributylamine according to claim 1, characterized in that: The spray plate (11) includes a hollow inner ring, a hollow outer ring, a straight pipe and a nozzle. The hollow inner ring is horizontally set inside the water absorption chamber (5) and the alkaline spray chamber (6). The hollow outer ring is sleeved on the outside of the hollow inner ring. A straight pipe is provided between the hollow outer ring and the hollow inner ring. The hollow outer ring is fixed on the inner wall of the water absorption chamber (5) and the alkaline spray chamber (6). The bottom of both the hollow outer ring and the hollow inner ring is provided with a nozzle. The output end of the liquid pump (10) is connected to the hollow outer ring through a conduit.

4. The electrolytic cell for preparing perfluorotributylamine according to claim 1, characterized in that: An installation ring (1201) is horizontally arranged at the inner top of the treatment tower (2). A slot (1202) is opened inside the installation ring (1201). The activated carbon plate (12) is located inside the slot (1202). An installation port is provided on the side of the installation ring (1201). A door panel is opened at the top of the side of the treatment tower (2) corresponding to the position of the installation port.

5. The electrolytic cell for preparing perfluorotributylamine according to claim 1, characterized in that: The turbulence mechanism (9) includes a stirring motor (901), a stirring shaft (902), stirring blades (903), and fan blades (904). The stirring motor (901) is installed at the bottom of the water absorption chamber (5). The stirring shaft (902) is vertically installed at the output end of the stirring motor (901). The stirring shaft (902) passes through the through pipe (7) and extends to the top of the through pipe (7). The fan blades (904) are installed at the top of the through pipe (7). The stirring blades (903) are installed at the bottom of the stirring shaft (902), and the stirring blades (903) are located inside the aqueous solution.

6. The electrolytic cell for preparing perfluorotributylamine according to claim 5, characterized in that: The stirring blades (903) are provided with four sets of sides perpendicular to the stirring shaft (902), and the stirring blades (903) are arranged in a ring array.

7. The electrolytic cell for preparing perfluorotributylamine according to claim 1, characterized in that: Both the water absorption chamber (5) and the alkaline spray chamber (6) have transparent windows on their outer sides, and both the bottom of the water absorption chamber (5) and the alkaline spray chamber (6) have discharge pipes.

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