Fluorine-containing special monomer recovery device and recovery system

Abstract

The utility model relates to the technical field of material recovery, in particular to a fluorine-containing special monomer recovery device and a fluorine-containing special monomer recovery system.The recovery device comprises an alkaline washing tower, the alkaline washing tower is provided with a first inlet and a first outlet, and the first inlet is used for inputting a fluorine-containing monomer mixture; the water washing tower is provided with a second inlet and a second outlet, and the second inlet is communicated with the first outlet; the first condenser is provided with a third inlet and a third outlet, and the third inlet is communicated with the second outlet; the second condenser is provided with a fourth inlet, a liquid phase outlet and a gas phase outlet, the fourth inlet is communicated with the third outlet, the temperature of the second condenser is lower than that of the first condenser, the liquid phase outlet is used for discharging liquid fluorine-containing special monomers, and the gas phase outlet is used for discharging gaseous fluorine-containing common monomers. The device disclosed by the utility model can be used for removing acidic substances and free radicals in the recovered fluorine-containing monomer mixture.

Description

Technical Field

[0001] The utility model relates to the technical field of material recovery, in particular to a recovery device and a recovery system for special fluorine-containing monomers. Background Art

[0002] Perfluoroether rubber is made of fluorinated monomers such as perfluoromethyl vinyl ether (PMVE) and tetrafluoroethylene (TFE). After mixing, they are added to a reactor for reaction. After the reaction is completed, some unreacted fluorinated monomer mixture will remain in the reactor. If these fluorinated monomer mixtures are directly sent to environmental protection equipment for treatment, a large amount of raw materials will be wasted. Therefore, the unreacted fluorinated monomer mixture needs to be recycled and reused.

[0003] The existing recycling method is: after the reaction is completed, the fluorinated monomer mixture is cooled and then recycled to the recovery buffer tank for cache, and then transported to the initial batching tank through a pipeline for recycling.

[0004] It is noted that the recovered fluorinated monomer mixture will contain some acidic substances and free radicals. If the recovered fluorinated monomer mixture is directly put into subsequent production, these acidic substances and free radicals will undergo polymerization reactions with other subsequent raw materials in equipment such as batching tanks, compressors, and pipelines between equipment, resulting in waste of raw materials and blockage of pipelines, thereby causing pipeline overpressure and safety accidents. Utility Model Content

[0005] The utility model aims to provide a recovery device and a recovery system for special fluorine-containing monomers, which can remove acidic substances and free radicals in the recovered fluorine-containing monomer mixture.

[0006] To achieve the above-mentioned purpose, in a first aspect, a recovery device for fluorine-containing special monomers is provided, comprising:

[0007] An alkali washing tower, the alkali washing tower having a first inlet and a first outlet, the first inlet being used to input a fluorine-containing monomer mixture;

[0008] a water washing tower, the water washing tower having a second inlet and a second outlet, the second inlet being connected to the first outlet;

[0009] a first condenser, the first condenser having a third inlet and a third outlet, the third inlet being in communication with the second outlet;

[0010] A second condenser, the second condenser has a fourth inlet, a liquid phase outlet and a gas phase outlet, the fourth inlet is connected to the third outlet, the temperature of the second condenser is lower than the temperature of the first condenser, the liquid phase outlet is used to discharge liquid fluorine-containing special monomers, and the gas phase outlet is used to discharge gaseous fluorine-containing ordinary monomers.

[0011] In certain embodiments, a first feed pipe is provided on the first inlet of the alkali washing tower, a first valve is provided on the first feed pipe, a first pressure detecting component is provided on the top of the alkali washing tower, and the opening degree of the first valve is determined according to the pressure information of the first pressure detecting component.

[0012] In some embodiments, an alkali liquid spray port is provided above the interior of the alkali washing tower, and an alkali washing circulation pump is provided on the alkali washing tower. The inlet of the alkali washing circulation pump is connected to the lower portion of the alkali washing tower through a first alkali washing circulation pipe, and the outlet of the alkali washing circulation pump is connected to the alkali liquid spray port through a second alkali washing circulation pipe. A first flow regulating valve and a first flow detection component are provided on the second alkali washing circulation pipe, and the opening degree of the first flow regulating valve is determined according to the flow information of the first flow detection component.

[0013] In some embodiments, a water washing spray port is provided above the interior of the water washing tower, and a water washing circulation pump is provided on the water washing tower. The inlet of the water washing circulation pump is connected to the lower part of the water washing tower through a first water washing circulation pipe, and the outlet of the water washing circulation pump is connected to the water washing spray port through a second water washing circulation pipe. A second flow regulating valve and a second flow detection component are provided on the second water washing circulation pipe, and the opening degree of the second flow regulating valve is determined according to the flow information of the second flow detection component.

[0014] In some embodiments, a first refrigerant feed pipe and a first refrigerant discharge pipe are provided on the first condenser, a fourth valve is provided on the first refrigerant feed pipe, a first gas phase temperature sensor is provided on the first condenser, and the opening degree of the fourth valve is determined according to the temperature information of the first gas phase temperature sensor.

[0015] In some embodiments, a second refrigerant feed pipe and a second refrigerant discharge pipe are provided on the second condenser, a fifth valve is provided on the second refrigerant feed pipe, a second gas phase temperature sensor is provided on the second condenser, and the opening degree of the fifth valve is determined according to the temperature information of the second gas phase temperature sensor.

[0016] In some embodiments, a discharge pipe is provided on the gas phase outlet of the second condenser, a sixth valve is provided on the discharge pipe, a third pressure detection component is provided on the second condenser, and the opening degree of the sixth valve is determined according to the pressure information of the third pressure detection component.

[0017] In some embodiments, the concentration of the alkali solution in the alkali washing tower is 2-8%.

[0018] In some embodiments, the pH value of the water in the water washing tower is 5-9.

[0019] In a second aspect, a recovery system for fluorine-containing special monomers is provided, comprising a buffer tank and the above-mentioned recovery device, wherein the first inlet is connected to the buffer tank.

[0020] Compared with the prior art, the utility model has the beneficial effect that after alkali washing, water washing and condensation, the fluorine-containing monomer mixture is separated into liquid fluorine-containing special monomers and gaseous fluorine-containing common monomers, and the originally mixed acidic substances and free radicals are removed, so that the obtained fluorine-containing special monomers and fluorine-containing common monomers can be directly put into subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a recovery device for fluorine-containing special monomers provided in an embodiment of the utility model.

[0022] In the figure: 1, alkali washing tower; 11, first inlet; 111, first feed pipe; 112, first valve; 12, first outlet; 13, alkali solution spray port; 14, alkali washing circulation pump; 141, first alkali washing circulation pipe; 142, second alkali washing circulation pipe; 143, first flow regulating valve; 144, first flow detection component; 15, first liquid level detection component; 16, alkali solution replenishment pipeline; 161, second valve; 17, first pressure detection component; 2, water washing tower; 21, second inlet; 211, second feed pipe; 22, second outlet; 23, water washing spray port; 24, water washing circulation pump; 241, first water washing circulation pipe; 242, second water washing circulation pipe; 243, second flow regulating valve; 244, second flow detection component; 25, second liquid level detection component 1. a pressure measuring component; 26. a water supply pipeline; 261. a third valve; 27. a second pressure measuring component; 3. a first condenser; 31. a third inlet; 311. a third feed pipe; 32. a third outlet; 33. a first refrigerant feed pipe; 331. a fourth valve; 34. a first refrigerant discharge pipe; 35. a first gas-phase temperature sensor; 36. a first liquid-phase temperature sensor; 37. a sewage outlet; 4. a second condenser; 41. a fourth inlet; 411. a fourth feed pipe; 42. a liquid-phase outlet; 43. a gas-phase outlet; 44. a second refrigerant feed pipe; 441. a fifth valve; 45. a second refrigerant discharge pipe; 46. a second gas-phase temperature sensor; 47. a second liquid-phase temperature sensor; 48. a discharge pipe; 481. a sixth valve; 49. a third pressure measuring component. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It is also necessary to explain that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings, rather than all.

[0024] Some directional words are defined in the present utility model. Unless otherwise specified, the directional words used, such as "up", "down", "left", "right", "inside" and "outside", are used for ease of understanding and therefore do not constitute limitations on the protection scope of the present utility model.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The fluorinated monomer mixture includes fluorinated special monomers and fluorinated common monomers, wherein the fluorinated special monomers refer to perfluoromethyl vinyl ether (PMVE) and tetrafluoroethylene (TFE), and the rest are fluorinated common monomers. The recovered fluorinated monomer mixture also contains acidic substances and free radicals.

[0028] Figure 1 The schematic diagram of the recovery device for fluorine-containing special monomers (hereinafter referred to as the recovery device) provided in the embodiment of the utility model is shown. Figure 1The recovery device includes an alkali washing tower 1, a water washing tower 2, a first condenser 3 and a second condenser 4 from left to right. When the recovery device is in use, the recovered fluorine-containing monomer mixture first enters the alkali washing tower 1 to remove acidic substances and free radicals by alkali washing, and then enters the water washing tower 2 to remove alkaline substances remaining in the alkali washing process by water washing, and then enters the first condenser 3 to remove water in the water washing process by condensation, and then enters the second condenser 4 to condense and liquefy the fluorine-containing special monomers by condensation, thereby separating them. In addition, the gas phase monomers (fluorine-containing ordinary monomers) that have not been condensed and liquefied in the second condenser 4 are also separated and transported to the corresponding workshop for recycling and treatment.

[0029] After being processed by the recovery device, the acidic substances and free radicals contained in the recovered fluorinated monomers can be removed, so that the recovered special fluorinated monomers can be directly put into subsequent production.

[0030] like Figure 1 As shown, the alkali washing tower 1 has a first inlet 11 for materials to enter. In this embodiment, a first feed pipe 111 is arranged on the first inlet 11, and a first valve 112 for controlling the on-off of the first feed pipe 111 is arranged on the first feed pipe 111. The first feed pipe 111 can be connected to a buffer tank of a recovery system. When the first valve 112 is opened, the fluorine-containing monomer mixture stored in the buffer tank can enter the alkali washing tower 1 through the first feed pipe 111.

[0031] The first inlet 11 is located at the lower part of the alkali washing tower 1, and the alkali solution spray port 13 in the alkali washing tower 1 is located at the upper part, so that the fluorine-containing monomer mixture entering the alkali washing tower 1 will inevitably contact with the alkali solution sprayed from the alkali solution spray port 13 during the upward flow process, ensuring that the fluorine-containing monomer mixture is fully in contact with the alkali solution.

[0032] like Figure 1 As shown, the alkali washing tower 1 is provided with an alkali washing circulation pump 14, the inlet of the alkali washing circulation pump 14 is connected to the lower part of the alkali washing tower 1 through the first alkali washing circulation pipe 141, and the outlet of the alkali washing circulation pump 14 is connected to the alkali solution spray port 13 through the second alkali washing circulation pipe 142, so that the alkali solution gathered in the lower part of the alkali washing tower 1 can return to the alkali solution spray port 13 under the action of the alkali washing circulation pump 14, and spray downward to perform alkali washing on the fluorine-containing monomer mixture, so as to realize the reuse of the alkali solution and reduce the amount of the alkali solution. The second alkali washing circulation pipe 142 is provided with a first flow regulating valve 143 and a first flow detection component 144, the first flow detection component 144 is used to detect the flow of the alkali solution in the second alkali washing circulation pipe 142, the first flow detection component 144 can provide a feedback signal to the first flow regulating valve 143, and the first flow regulating valve 143 adjusts the flow of the alkali solution in the second alkali washing circulation pipe 142 according to the feedback signal.

[0033] like Figure 1 As shown, a first liquid level detection component 15 is further provided at the lower part of the alkali washing tower 1, and the first liquid level detection component 15 is used to detect the liquid level of the alkali solution in the lower part of the alkali washing tower 1. An alkali solution replenishing pipeline 16 is also provided on the alkali washing tower 1, and the alkali solution replenishing pipeline 16 is connected to the alkali solution storage tank (not shown). A second valve 161 is provided on the alkali solution replenishing pipeline 16, and the second valve 161 is used to control the on-off of the alkali solution replenishing pipeline 16. When the second valve 161 is opened, the alkali solution in the alkali solution storage tank can enter the alkali washing tower 1 through the alkali solution replenishing pipeline 16, thereby increasing the amount of alkali solution in the alkali washing tower 1, ensuring that there is enough alkali solution in the alkali washing tower 1.

[0034] like Figure 1 As shown, a first pressure detection component 17 is provided in the middle and upper part of the alkali washing tower 1. The first pressure detection component 17 is used to detect the pressure in the alkali washing tower 1. The first pressure detection component 17 can provide a feedback signal to the first valve 112, and the first valve 112 controls the flow of the first feed pipe 111 according to the feedback signal.

[0035] like Figure 1 As shown, a first outlet 12 for discharging the alkali-washed material is provided at the top of the alkali-washing tower 1 , and the first outlet 12 is connected to the second inlet 21 of the water-washing tower 2 through a second feed pipe 211 , so that the alkali-washed material can enter the water-washing tower 2 .

[0036] The second inlet 21 is located at the lower part of the water washing tower 2, and the water washing spray port 23 in the water washing tower 2 is located at the upper part, so that the fluorine-containing monomer mixture entering the water washing tower 2 will inevitably contact with the water sprayed from the water washing spray port 23 during the upward flow process, ensuring that the fluorine-containing monomer mixture is fully in contact with water.

[0037] like Figure 1 As shown, a water washing circulating pump 24 is provided on the water washing tower 2, and the inlet of the water washing circulating pump 24 is connected to the lower part of the water washing tower 2 through the first water washing circulating pipe 241, and the outlet of the water washing circulating pump 24 is connected to the water washing spray port 23 through the second water washing circulating pipe 242, so that the water gathered in the lower part of the water washing tower 2 can return to the water washing spray port 23 under the action of the water washing circulating pump 24, and spray downward to wash the fluorine-containing monomer mixture, so as to realize the reuse of water and reduce the amount of water. A second flow regulating valve 243 and a second flow detection component 244 are provided on the second water washing circulating pipe 242, and the second flow detection component 244 is used to detect the flow of water in the second water washing circulating pipe 242, and the second flow detection component 244 can provide a feedback signal to the second flow regulating valve 243, and the second flow regulating valve 243 adjusts the flow of water in the second water washing circulating pipe 242 according to the feedback signal.

[0038] like Figure 1As shown, a second liquid level detection component 25 is also provided at the lower part of the water washing tower 2, and the second liquid level detection component 25 is used to detect the liquid level of water in the lower part of the water washing tower 2. A water replenishing pipe 26 is also provided on the water washing tower 2, and the water replenishing pipe 26 is connected to a water storage tank (not shown). A third valve 261 is provided on the water replenishing pipe 26, and the third valve 261 is used to control the on-off of the water replenishing pipe 26. When the third valve 261 is opened, the water in the water storage tank can enter the water washing tower 2 through the water replenishing pipe 26, thereby increasing the amount of water in the water washing tower 2 and ensuring that there is enough water in the water washing tower 2.

[0039] like Figure 1 As shown, a second pressure detection component 27 is provided in the middle and upper part of the water washing tower 2 , and the second pressure detection component 27 is used to detect the pressure in the water washing tower 2 .

[0040] like Figure 1 As shown, a second outlet 22 for discharging the washed material is provided at the top of the water washing tower 2 , and the second outlet 22 is connected to the third inlet 31 of the first condenser 3 through a third feed pipe 311 , so that the washed material can enter the first condenser 3 .

[0041] The first condenser 3 is provided with a first refrigerant feed pipe 33 and a first refrigerant discharge pipe 34. The first refrigerant feed pipe 33 is provided with a fourth valve 331. The fourth valve 331 controls the flow rate of the refrigerant in the first refrigerant feed pipe 33. The first condenser 3 is also provided with a first gas phase temperature sensor 35 and a first liquid phase temperature sensor 36. The first gas phase temperature sensor 35 is provided at a position close to the upper part of the first condenser 3, and is used to detect the temperature of the gas phase in the first condenser 3. In this embodiment, the first gas phase temperature sensor 35 is also close to the third outlet 32 ​​of the first condenser 3, and can detect the temperature of the gas phase discharged from the first condenser 3. The first liquid phase temperature sensor 36 is provided at a position close to the lower part of the first condenser 3, and is used to detect the temperature of the liquid phase in the first condenser 3.

[0042] A sewage outlet 37 is provided at the bottom of the first condenser 3 , and the sewage outlet 37 is used to discharge the condensed water formed by condensation in the water washing tower 2 .

[0043] like Figure 1 As shown, the third outlet 32 ​​of the first condenser 3 and the fourth inlet 41 of the second condenser 4 are connected via a fourth feed pipe 411 , so that the material condensed by the first condenser 3 can enter the second condenser 4 .

[0044] The second condenser 4 is provided with a second refrigerant feed pipe 44 and a second refrigerant discharge pipe 45. The second refrigerant feed pipe 44 is provided with a fifth valve 441, which controls the flow rate of the refrigerant in the second refrigerant feed pipe 44. The second condenser 4 is also provided with a second gas phase temperature sensor 46 and a second liquid phase temperature sensor 47. The second gas phase temperature sensor 46 is provided at a position close to the upper part of the second condenser 4, and is used to detect the temperature of the gas phase in the second condenser 4. In this embodiment, the second gas phase temperature sensor 46 is also close to the third outlet 32 ​​of the second condenser 4, and can detect the temperature of the gas phase discharged from the second condenser 4. The second liquid phase temperature sensor 47 is provided at a position close to the lower part of the second condenser 4, and is used to detect the temperature of the liquid phase in the second condenser 4.

[0045] The bottom of the second condenser 4 is provided with a liquid phase outlet 42, which is used to discharge the fluorine-containing special monomers condensed in the second condenser 4 in the future. The top of the second condenser 4 is provided with a gas phase outlet 43, which is used to discharge the uncondensed fluorine-containing ordinary monomers in the second condenser 4. The gas phase outlet 43 is provided with a discharge pipe 48, and the sixth valve 481 is provided on the discharge pipe 48. The second condenser 4 is also provided with a third pressure detection component 49, which is used to detect the pressure in the second condenser 4. The pressure in the second condenser 4 can be controlled through the sixth valve 481.

[0046] When the recovery device is used, the following steps are included:

[0047] The gas phase temperature of the first condenser 3 and the second condenser 4 is set to a preset value. Specifically, the opening degree of the fourth valve 331 and the fifth valve 441 can be automatically adjusted by the control system to control the gas phase outlet 43 temperature of the first condenser 3 and the second condenser 4.

[0048] Alkali solution and water are added to the alkali washing tower 1 and the water washing tower 2 respectively, and the alkali washing circulation pump 14 and the water washing circulation pump 24 are started respectively, and the spray flow rate is set. Specifically, the opening degree of the second valve 161 and the third valve 261 can be automatically controlled by the control system to control the spraying amount of the alkali washing tower 1 and the water washing tower 2. In addition, it is necessary to regularly sample and analyze the alkali solution in the alkali washing tower 1 to control the concentration of the alkali solution to 2-8%; regularly monitor the pH value of the water in the water washing tower 2 to control the pH value to 5-9.

[0049] The pressure of the gas phase outlet 43 of the second condenser 4 is set to a preset value (eg, 0.1 MPa). Specifically, the opening degree of the sixth valve 481 can be automatically controlled by the control system to control the pressure of the entire recovery device, thereby controlling the recovery rate of the fluorine-containing special monomer.

[0050] After the above work is completed, the pressure of the first pressure detection component 17 on the alkali washing tower 1 is set to a preset value (eg 0.15 MPa), and the opening degree of the first valve 112 is automatically controlled by the control system to control the feed amount of the fluorine-containing monomer mixture.

[0051] The fluorine-containing monomer mixture passes through the alkali washing tower 1, the water washing tower 2, the first condenser 3 and the second condenser 4 in sequence, and finally obtains liquid fluorine-containing special monomers and gaseous fluorine-containing common monomers.

[0052] When the pressure of the upstream buffer tank is less than or equal to 0.15 MPa, the first valve 112 of the alkali washing tower 1 is closed, and the recovery process is completed.

[0053] When the pressure of the upstream buffer tank is greater than 0.15 MPa, repeat the above steps to recover the fluorine-containing special monomer.

[0054] The above is a description of the embodiments of the utility model. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in the field. The general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown in this article, but will comply with the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A recovery device for fluorine-containing special monomers, characterized in that: include: An alkali washing tower (1), the alkali washing tower (1) having a first inlet (11) and a first outlet (12), the first inlet (11) being used to input a fluorine-containing monomer mixture; A water washing tower (2), the water washing tower (2) having a second inlet (21) and a second outlet (22), the second inlet (21) being in communication with the first outlet (12); A first condenser (3), the first condenser (3) having a third inlet (31) and a third outlet (32), the third inlet (31) being in communication with the second outlet (22); A second condenser (4), wherein the second condenser (4) has a fourth inlet (41), a liquid phase outlet (42) and a gas phase outlet (43), wherein the fourth inlet (41) is connected to the third outlet (32), the temperature of the second condenser (4) is lower than the temperature of the first condenser (3), the liquid phase outlet (42) is used to discharge liquid fluorine-containing special monomers, and the gas phase outlet (43) is used to discharge gaseous fluorine-containing ordinary monomers.

2. The recovery device according to claim 1, characterized in that: A first feed pipe (111) is arranged on the first inlet (11) of the alkali washing tower (1), a first valve (112) is arranged on the first feed pipe (111), a first pressure detection component (17) is arranged on the top of the alkali washing tower (1), and the opening degree of the first valve (112) is determined according to the pressure information of the first pressure detection component (17).

3. The recovery device according to claim 1, characterized in that: An alkali liquid spray port (13) is arranged above the interior of the alkali washing tower (1), and an alkali washing circulation pump (14) is arranged on the alkali washing tower (1). The inlet of the alkali washing circulation pump (14) is connected to the lower part of the alkali washing tower (1) through a first alkali washing circulation pipe (141), and the outlet of the alkali washing circulation pump (14) is connected to the alkali liquid spray port (13) through a second alkali washing circulation pipe (142). The second alkali washing circulation pipe (142) is provided with a first flow regulating valve (143) and a first flow detection component (144), and the opening degree of the first flow regulating valve (143) is determined according to the flow information of the first flow detection component (144).

4. The recovery device according to claim 1, characterized in that: A water washing spray port (23) is arranged above the inside of the water washing tower (2), and a water washing circulation pump (24) is arranged on the water washing tower (2). The inlet of the water washing circulation pump (24) is connected to the lower part of the water washing tower (2) through a first water washing circulation pipe (241), and the outlet of the water washing circulation pump (24) is connected to the water washing spray port (23) through a second water washing circulation pipe (242). A second flow regulating valve (243) and a second flow detection component (244) are arranged on the second water washing circulation pipe (242), and the opening degree of the second flow regulating valve (243) is determined according to the flow information of the second flow detection component (244).

5. The recovery device according to claim 1, characterized in that: The first condenser (3) is provided with a first refrigerant feed pipe (33) and a first refrigerant discharge pipe (34), the first refrigerant feed pipe (33) is provided with a fourth valve (331), the first condenser (3) is provided with a first gas phase temperature sensor (35), and the opening degree of the fourth valve (331) is determined according to the temperature information of the first gas phase temperature sensor (35).

6. The recovery device according to claim 1, characterized in that: The second condenser (4) is provided with a second refrigerant feed pipe (44) and a second refrigerant discharge pipe (45), the second refrigerant feed pipe (44) is provided with a fifth valve (441), the second condenser (4) is provided with a second gas phase temperature sensor (46), and the opening degree of the fifth valve (441) is determined according to the temperature information of the second gas phase temperature sensor (46).

7. The recovery device according to claim 1, characterized in that: The gas phase outlet (43) of the second condenser (4) is provided with a discharge pipe (48), and the discharge pipe (48) is provided with a sixth valve (481). The second condenser (4) is provided with a third pressure detection component (49), and the opening degree of the sixth valve (481) is determined according to the pressure information of the third pressure detection component (49).

8. The recovery device according to claim 1, characterized in that: The concentration of the alkali solution in the alkali washing tower (1) is 2-8%.

9. The recovery device according to claim 1, characterized in that: The pH value of the water in the water washing tower (2) is 5-9.

10. A recovery system for fluorine-containing special monomers, characterized in that: It comprises a buffer tank and the recovery device according to any one of claims 1 to 9, wherein the first inlet (11) is connected to the buffer tank.

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