3, 4-difluorobenzonitrile decompression rectifying still

Abstract

The utility model relates to the technical field of decompression rectifying kettles, in particular to a 3, 4-difluorobenzonitrile decompression rectifying kettle, which is characterized in that 3, 4-difluorobenzonitrile in a heating process is exhausted by starting an exhaust mechanism, exhausted gas is condensed by starting a condensation mechanism, and generated gas is exhausted into a decomposition mechanism through the exhaust mechanism, so that the 3, 4-difluorobenzonitrile is decomposed by the decomposition mechanism. Gas is decomposed by starting the decomposition mechanism, after distillation is completed, residues in the heating mechanism are discharged into the filtering mechanism, solid-liquid separation is conducted on the residues by starting the filtering mechanism, and the practicability of the equipment is improved; comprising a heating mechanism; the stirring mechanism is installed in the heating mechanism, the exhaust mechanism is located on the right side of the condensation mechanism, the condensation mechanism is located on the right side of the heating mechanism, the decomposition mechanism is located on the right side of the condensation mechanism, and the filtering mechanism is located below the heating mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of vacuum distillation kettles, and in particular to a vacuum distillation kettle for 3,4-difluorobenzonitrile. Background Technology

[0002] 3,4-Difluorobenzonitrile is a chemical substance, and its vacuum distillation vessel is an important piece of equipment used in chemical production for purifying this substance. The vacuum distillation vessel is a device for rapidly concentrating liquid samples, and its working principle is based on the principle of vacuum distillation. Under reduced pressure, the boiling point of the liquid will decrease, so distillation can be carried out at a lower temperature. The equipment maintains a high vacuum through a magnetic stirring system, so that the sample is heated and depressurized in the reaction vessel, and the stirring system continuously rotates to increase the evaporation surface area and accelerate the evaporation rate.

[0003] For example, in the utility model patent application number 202322840071.X, the prior art, represented by the vacuum distillation kettle, mainly consists of a vacuum distillation kettle, a steam pipe, a condenser, a reflux pipe, a discharge pipe, a drive motor, and a drive shaft. The function of the vacuum distillation kettle is realized through the cooperation of the vacuum distillation kettle, steam pipe, condenser, reflux pipe, discharge pipe, drive motor, and drive shaft.

[0004] Gases are generated during the vacuum distillation of 3,4-difluorobenzonitrile. Traditional vacuum distillation kettles are difficult to decompose and treat the gases generated during the preparation of 3,4-difluorobenzonitrile. Furthermore, it is difficult to achieve solid-liquid separation of the residue after vacuum distillation of 3,4-difluorobenzonitrile. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a 3,4-difluorobenzonitrile vacuum distillation kettle that discharges 3,4-difluorobenzonitrile during the heating process by activating an exhaust mechanism, condenses the discharged gas by activating a condensation mechanism, and discharges the generated gas to a decomposition mechanism by activating the exhaust mechanism. After distillation, the residue in the heating mechanism is discharged to a filtration mechanism for solid-liquid separation by activating the filtration mechanism, thereby improving the practicality of the equipment.

[0006] This invention relates to a vacuum distillation vessel for 3,4-difluorobenzonitrile, comprising a heating mechanism; it also includes a stirring mechanism, an exhaust mechanism, a condensing mechanism, a decomposition mechanism, and a filtration mechanism. The stirring mechanism is installed inside the heating mechanism, the exhaust mechanism is located to the right of the condensing mechanism, the decomposition mechanism is located to the right of the condensing mechanism, and the filtration mechanism is located below the heating mechanism. The 3,4-difluorobenzonitrile feedstock is discharged into the heating mechanism, and the heating mechanism is activated to distill the 3,4-difluorobenzonitrile feedstock. During the distillation process of 3,4-difluorobenzonitrile, the stirring mechanism is activated. The stirring mechanism stirs the 3,4-difluorobenzonitrile raw material to ensure uniform heating. The exhaust mechanism discharges the 3,4-difluorobenzonitrile produced during the heating process, and the condensing mechanism condenses the discharged gas. After condensation, the distilled 3,4-difluorobenzonitrile is collected by the condensing mechanism. The generated gas is discharged to the decomposition mechanism through the exhaust mechanism, where it is decomposed. After distillation, the residue in the heating mechanism is discharged to the filtration mechanism for solid-liquid separation, improving the practicality of the equipment.

[0007] Preferably, the heating mechanism includes a distillation kettle, a feed pipe, a heater, a discharge pipe, and a support frame. The output end of the feed pipe is connected to the outer wall of the distillation kettle, the heater is installed on the outer wall of the distillation kettle, the input end of the discharge pipe is connected to the bottom end of the distillation kettle, and a valve is installed on the output end of the discharge pipe. The distillation kettle is installed on the support frame. The 3,4-difluorobenzonitrile raw material is discharged into the distillation kettle through the feed pipe. The 3,4-difluorobenzonitrile material in the distillation kettle is heated and distilled by starting the heater. The residue of the 3,4-difluorobenzonitrile raw material in the distillation kettle is discharged into the filtration mechanism through the discharge pipe. The support frame supports the distillation kettle, improving the practicality of the equipment.

[0008] Preferably, the stirring mechanism includes a first motor, a stirring shaft, multiple first stirring plates, multiple first connecting rods, and multiple second stirring plates. The top end of the stirring shaft is mounted on the output end of the first motor, and multiple first stirring plates are arranged on the stirring shaft. One end of each of the multiple first connecting rods is mounted on the stirring shaft, and the multiple second stirring plates are mounted on the other ends of each of the multiple first connecting rods. The stirring shaft is located inside the distillation vessel. By starting the first motor, the stirring shaft is rotated, and the 3,4-difluorobenzonitrile material is stirred by the multiple first stirring plates. The multiple first connecting rods support the multiple second stirring plates, and the 3,4-difluorobenzonitrile material on the inner wall of the distillation vessel is stirred by the multiple second stirring plates, thereby improving the practicality of the equipment.

[0009] Preferably, the exhaust mechanism includes a first pipe, a vacuum pump, and a second pipe. The input end of the first pipe is connected to the condensation mechanism, the output end of the first pipe is connected to the input end of the vacuum pump, the output end of the vacuum pump is connected to the input end of the second pipe, and the output end of the second pipe is connected to the decomposition mechanism. By starting the vacuum pump, the gas in the distillation kettle is discharged and discharged into the decomposition mechanism through the first pipe and the second pipe, thereby improving the practicality of the equipment.

[0010] Preferably, the condensation mechanism includes a third pipe, a condenser tube, a cooler, a baffle plate, a fourth pipe, a collection tank, and a discharge pipe. The inlet end of the third pipe is connected to the outer wall of the distillation kettle, and the outlet end of the third pipe is connected to the left end of the condenser tube. The inlet end of the condenser tube is connected to the outlet end of the cooler, and the outlet end of the condenser tube is connected to the inlet end of the cooler. The cooler is installed at the top of the collection tank, and the baffle plate is installed on the inner wall of the condenser tube. The inlet end of the fourth pipe is connected to the outer wall of the condenser tube and is located below the baffle plate. The outlet end of the fourth pipe is connected to the top of the collection tank, and the inlet end of the discharge pipe is connected to the side wall of the collection tank. A valve is installed at the outlet end of the discharge pipe. By starting the vacuum pump, the gas in the distillation kettle is discharged into the condenser tube, and the gas is cooled by the condenser tube. The cooled 3,4-difluorobenzonitrile is discharged into the collection tank through the fourth pipe via the baffle plate. The 3,4-difluorobenzonitrile in the collection tank is discharged through the discharge pipe. The cooler then cools the refrigerant in the condenser tube, improving the practicality of the equipment.

[0011] Preferably, the decomposition mechanism includes a circulating pump, a spray pipe, a decomposition tank, a filter plate, and a fifth pipe. The circulating pump is installed at the top of the decomposition tank, and its input end is connected to the output end of the decomposition solution. The input end of the spray pipe is connected to the output end of the circulating pump, and multiple nozzles are installed on the output end of the spray pipe, which is located inside the decomposition tank. The filter plate is installed on the inner wall of the decomposition tank and is located below the spray pipe. The input end of the fifth pipe is connected to the outer wall of the decomposition tank, and a valve is installed on the output end of the fifth pipe. The second pipe discharges gas into the spray pipe. By starting the circulating pump, the dissolved solution is sprayed out through the spray pipe to decompose the gas. After decomposition, the solution is filtered by the filter plate and discharged through the fifth pipe, improving the practicality of the equipment.

[0012] Preferably, the filtration mechanism includes a second motor, a second connecting rod, a filter barrel, a drain barrel, and a sixth pipe. The second motor is installed at the top of the filter barrel. One end of each of the multiple second connecting rods is installed on the output end of the second motor, and the other end of each of the multiple second connecting rods is installed on the filter barrel. The filter barrel is located inside the drain barrel, and the lower part of the filter barrel is rotatably installed at the bottom of the drain barrel. The inlet end of the sixth pipe is connected to the outer wall of the drain barrel, and a valve is provided on the outlet end of the sixth pipe. The residue in the distillation kettle is discharged into the filter barrel. By starting the second motor and connecting the multiple second connecting rods, the filter barrel is rotated inside the drain barrel. The liquid in the residue is discharged through the sixth pipe, and the solid is discharged through the filter barrel, improving the practicality of the equipment.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 3,4-difluorobenzonitrile raw material is discharged into the heating mechanism, and the 3,4-difluorobenzonitrile raw material is heated and distilled by starting the heating mechanism. During the distillation of 3,4-difluorobenzonitrile, the stirring mechanism is started to stir the 3,4-difluorobenzonitrile raw material, so that the 3,4-difluorobenzonitrile raw material is heated evenly. The 3,4-difluorobenzonitrile in the heating process is discharged by starting the exhaust mechanism, and the discharged gas is condensed by starting the condensation mechanism. After condensation, the distilled 3,4-difluorobenzonitrile is collected by the condensation mechanism, and the generated gas is discharged into the decomposition mechanism by starting the exhaust mechanism. The gas is decomposed by starting the decomposition mechanism. After distillation, the residue in the heating mechanism is discharged into the filtration mechanism, and solid-liquid separation is performed by starting the filtration mechanism, thereby improving the practicality of the equipment. Attached Figure Description

[0014] Figure 1 This is an isometric sectional view of the present invention;

[0015] Figure 2 This is a front view of the heating mechanism of this utility model;

[0016] Figure 3 This is an isometric schematic diagram of the stirring mechanism of this utility model;

[0017] Figure 4 This is an isometric schematic diagram of the exhaust mechanism of this utility model;

[0018] Figure 5 This is an isometric sectional view of the condensation mechanism of this utility model;

[0019] Figure 6 This is an isometric sectional view of the disassembly mechanism of this utility model;

[0020] Figure 7 This is a front cross-sectional view of the filter mechanism of this utility model.

[0021] The attached diagram is labeled as follows: 01, Heating mechanism; 11, Distillation kettle; 12, Feed pipe; 13, Heater; 14, Discharge pipe; 15, Support frame; 02, Stirring mechanism; 21, First motor; 22, Stirring shaft; 23, First stirring plate; 24, First connecting rod; 25, Second stirring plate; 03, Exhaust mechanism; 31, First pipe; 32, Vacuum pump; 33, Second pipe; 04, Condensation mechanism; 41, Third pipe; 42, Condenser tube; 43, Refrigerator; 44, Baffle plate; 45, Fourth pipe; 46, Collection tank; 47, Discharge pipe; 05, Decomposition mechanism; 51, Circulation pump; 52, Spray pipe; 53, Decomposition tank; 54, Filter plate; 55, Fifth pipe; 06, Filtering mechanism; 61, Second motor; 62, Second connecting rod; 63, Filter tank; 64, Drainage tank; 65, Sixth pipe. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0023] Example 1

[0024] A 3,4-difluorobenzonitrile vacuum distillation vessel includes a heating mechanism 01; it also includes a stirring mechanism 02, an exhaust mechanism 03, a condensing mechanism 04, a decomposition mechanism 05, and a filtration mechanism 06. The stirring mechanism 02 is installed inside the heating mechanism 01, the exhaust mechanism 03 is located to the right of the condensing mechanism 04, the condensing mechanism 04 is located to the right of the heating mechanism 01, the decomposition mechanism 05 is located to the right of the condensing mechanism 04, and the filtration mechanism 06 is located below the heating mechanism 01.

[0025] The 3,4-difluorobenzonitrile raw material is discharged into the heating mechanism 01. The heating mechanism 01 is activated to heat and distill the 3,4-difluorobenzonitrile raw material. During the distillation process, the stirring mechanism 02 is activated to stir the 3,4-difluorobenzonitrile raw material, so that the 3,4-difluorobenzonitrile raw material is heated evenly. The exhaust mechanism 03 is activated to discharge the 3,4-difluorobenzonitrile produced during the heating process. The condensation mechanism 04 is activated to condense the discharged gas. After condensation, the distilled 3,4-difluorobenzonitrile is collected by the condensation mechanism 04. The generated gas is discharged into the decomposition mechanism 05 through the exhaust mechanism 03. The decomposition mechanism 05 is activated to decompose the gas. After distillation, the residue in the heating mechanism 01 is discharged into the filtration mechanism 06. The filtration mechanism 06 is activated to perform solid-liquid separation, thereby improving the practicality of the equipment.

[0026] The heating mechanism 01 includes a distillation vessel 11, a feed pipe 12, a heater 13, a discharge pipe 14, and a support frame 15. The output end of the feed pipe 12 is connected to the outer wall of the distillation vessel 11. The heater 13 is installed on the outer wall of the distillation vessel 11. The input end of the discharge pipe 14 is connected to the bottom end of the distillation vessel 11. A valve is provided on the output end of the discharge pipe 14. The distillation vessel 11 is installed on the support frame 15.

[0027] The stirring mechanism 02 includes a first motor 21, a stirring shaft 22, multiple first stirring plates 23, multiple first connecting rods 24, and multiple second stirring plates 25. The top end of the stirring shaft 22 is installed on the output end of the first motor 21. Multiple first stirring plates 23 are provided on the first stirring shaft 22. One end of each of the multiple first connecting rods 24 is installed on the stirring shaft 22. The multiple second stirring plates 25 are installed on the other end of each of the multiple first connecting rods 24. The stirring shaft 22 is located inside the distillation kettle 11.

[0028] The exhaust mechanism 03 includes a first pipe 31, a vacuum pump 32, and a second pipe 33. The input end of the first pipe 31 is connected to the condensation mechanism 04, the output end of the first pipe 31 is connected to the input end of the vacuum pump 32, the output end of the vacuum pump 32 is connected to the input end of the second pipe 33, and the output end of the second pipe 33 is connected to the decomposition mechanism 05.

[0029] The condensing mechanism 04 includes a third pipe 41, a condenser 42, a cooler 43, a baffle plate 44, a fourth pipe 45, a collection tank 46, and a discharge pipe 47. The input end of the third pipe 41 is connected to the outer wall of the distillation vessel 11, and the output end of the third pipe 41 is connected to the left end of the condenser 42. The input end of the condenser 42 is connected to the output end of the cooler 43, and the output end of the condenser 42 is connected to the input end of the cooler 43. The cooler 43 is installed at the top of the collection tank 46. The baffle plate 44 is installed on the inner wall of the condenser 42. The input end of the fourth pipe 45 is connected to the outer wall of the condenser 42, and the fourth pipe 45 is located below the baffle plate 44. The output end of the fourth pipe 45 is connected to the top of the collection tank 46. The input end of the discharge pipe 47 is connected to the side wall of the collection tank 46, and a valve is provided on the output end of the discharge pipe 47.

[0030] 3,4-Difluorobenzonitrile feedstock is discharged into distillation vessel 11 via feed pipe 12. Heater 13 is activated to heat and distill the 3,4-difluorobenzonitrile material in distillation vessel 11. Residue from the 3,4-difluorobenzonitrile feedstock in distillation vessel 11 is discharged into filter mechanism 06 via discharge pipe 14. Support frame 15 supports distillation vessel 11. The first motor 21 is activated to rotate stirring shaft 22, which stirs the 3,4-difluorobenzonitrile material via multiple first stirring plates 23. Multiple first connecting rods 24 support multiple second stirring plates 25, which stir the material in distillation vessel 11. The 3,4-difluorobenzonitrile material on the wall is stirred. By starting the vacuum pump 32, the gas in the distillation kettle 11 is discharged and discharged into the decomposition mechanism 05 through the first pipe 31 and the second pipe 33. By starting the vacuum pump 32, the gas in the distillation kettle 11 is discharged into the condenser 42 and cooled by the condenser 42. The cooled 3,4-difluorobenzonitrile is discharged into the collection tank 46 through the baffle plate 44 and the fourth pipe 45. The 3,4-difluorobenzonitrile in the collection tank 46 is discharged through the discharge pipe 47 and cooled by the cooler 43 to cool the refrigerant in the condenser 42, thereby improving the practicality of the equipment.

[0031] Example 2

[0032] Based on Embodiment 1, a decomposition mechanism 05 is also included. The decomposition mechanism 05 includes a circulation pump 51, a spray pipe 52, a decomposition tank 53, a filter plate 54, and a fifth pipe 55. The circulation pump 51 is installed at the top of the decomposition tank 53, and the input end of the circulation pump 51 is connected to the output end of the decomposition solution. The input end of the spray pipe 52 is connected to the output end of the circulation pump 51, and multiple nozzles are provided on the output end of the spray pipe 52. The spray pipe 52 is located inside the decomposition tank 53. The filter plate 54 is installed on the inner wall of the decomposition tank 53 and is located below the spray pipe 52. The input end of the fifth pipe 55 is connected to the outer wall of the decomposition tank 53, and a valve is provided on the output end of the fifth pipe 55.

[0033] The second pipe 33 discharges the gas into the spray pipe 52. By starting the circulation pump 51, the dissolved liquid is sprayed out through the spray pipe 52 to decompose the gas. After decomposition, the solution is filtered by the filter plate 54 and discharged through the fifth pipe 55, thus improving the practicality of the equipment.

[0034] Example 3

[0035] Based on Embodiment 1, a filtration mechanism 06 is also included. The filtration mechanism 06 includes a second motor 61, a second connecting rod 62, a filter barrel 63, a drain barrel 64, and a sixth pipe 65. The second motor 61 is installed at the top of the filter barrel 63. One end of each of the multiple second connecting rods 62 is installed on the output end of the second motor 61, and the other end of each of the multiple second connecting rods 62 is installed on the filter barrel 63. The filter barrel 63 is located inside the drain barrel 64. The lower part of the filter barrel 63 is rotatably installed at the bottom end of the drain barrel 64. The input end of the sixth pipe 65 is connected to the outer wall of the drain barrel 64, and a valve is provided on the output end of the sixth pipe 65.

[0036] The residue in the distillation vessel 11 is discharged into the filter barrel 63. By starting the second motor 61 and connecting multiple second connecting rods 62, the filter barrel 63 is rotated in the drain barrel 64. The liquid in the residue is discharged through the sixth pipe 65, and the solid is discharged through the filter barrel 63, thus improving the practicality of the equipment.

[0037] like Figures 1 to 7 As shown, this utility model discloses a 3,4-difluorobenzonitrile vacuum distillation vessel. During operation, the 3,4-difluorobenzonitrile feedstock is first discharged into the distillation vessel 11 via the feed pipe 12. The heater 13 is activated to heat and distill the 3,4-difluorobenzonitrile material in the distillation vessel 11. The residue from the 3,4-difluorobenzonitrile feedstock in the distillation vessel 11 is discharged into the filter mechanism 06 via the discharge pipe 14. The support frame 15 supports the distillation vessel 11. Then, the first motor 21 is activated to rotate the stirring shaft 22, which stirs the 3,4-difluorobenzonitrile material via multiple first stirring plates 23. Multiple first connecting rods 24 support multiple second stirring plates 25, which stir the 3,4-difluorobenzonitrile material on the inner wall of the distillation vessel 11. Afterwards, the vacuum pump 32 is activated to discharge the gas from the distillation vessel 11, which is then discharged into the decomposition mechanism 05 via the first pipe 31 and the second pipe 33. The gas in the distillation vessel 11 is discharged to the condenser tube 42 by starting the vacuum pump 32. The gas is cooled by the condenser tube 42. The cooled 3,4-difluorobenzonitrile is discharged to the collection tank 46 through the fourth pipe 45 via the baffle plate 44. The 3,4-difluorobenzonitrile in the collection tank 46 is discharged through the discharge pipe 47. The refrigerant in the condenser tube 42 is cooled by the refrigerator 43. Then the gas is discharged to the spray pipe 52 through the second pipe 33. The dissolved liquid is sprayed out through the spray pipe 52 by starting the circulation pump 51 to decompose the gas. The decomposed solution is filtered by the filter plate 54. After filtration, it is discharged through the fifth pipe 55. Finally, the residue in the distillation vessel 11 is discharged into the filter tank 63. The filter tank 63 is rotated in the drain tank 64 by starting the second motor 61 and connecting multiple second connecting rods 62. The liquid in the residue is discharged through the sixth pipe 65, and the solid is discharged through the filter tank 63, which improves the practicality of the equipment.

[0038] The distillation vessel 11, heater 13, first motor 21, vacuum pump 32, second pipeline 33, circulation pump 51 and second motor 61 of this utility model are purchased from the market. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0039] The main functions achieved by this utility model are as follows: by activating the exhaust mechanism 03, the 3,4-difluorobenzonitrile generated during the heating process is discharged; by activating the condensation mechanism 04, the discharged gas is condensed; the generated gas is discharged to the decomposition mechanism 05 through the exhaust mechanism 03; by activating the decomposition mechanism 05, the gas is decomposed; after distillation, the residue in the heating mechanism 01 is discharged to the filtration mechanism 06; by activating the filtration mechanism 06, solid-liquid separation is performed, thereby improving the practicality of the equipment.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A 3,4-difluorocinnamic acid vacuum rectification kettle, comprising a heating mechanism (01); characterized in that, The device further comprises a stirring mechanism (02), an exhaust mechanism (03), a condensing mechanism (04), a decomposition mechanism (05) and a filtering mechanism (06), the stirring mechanism (02) is installed inside the heating mechanism (01), the exhaust mechanism (03) is located at the right side of the condensing mechanism (04), the condensing mechanism (04) is located at the right side of the heating mechanism (01), the decomposition mechanism (05) is located at the right side of the condensing mechanism (04), and the filtering mechanism (06) is located below the heating mechanism (01).

2. A 3,4-difluorocinnamic acid vacuum rectification kettle according to claim 1, characterized in that, The heating mechanism (01) comprises a rectifying kettle (11), a feeding pipe (12), a heater (13), a discharging pipe (14) and a support frame (15), the output end of the feeding pipe (12) is connected with the outer wall of the rectifying kettle (11), the heater (13) is installed on the outer wall of the rectifying kettle (11), the input end of the discharging pipe (14) is connected with the bottom end of the rectifying kettle (11), a valve is arranged on the output end of the discharging pipe (14), and the rectifying kettle (11) is installed on the support frame (15).

3. A 3,4-difluorocinnamic acid vacuum rectification kettle according to claim 2, characterized in that, The stirring mechanism (02) comprises a first motor (21), a stirring shaft (22), a plurality of first stirring plates (23), a plurality of first connecting rods (24) and a plurality of second stirring plates (25), the top end of the stirring shaft (22) is installed on the output end of the first motor (21), a plurality of first stirring plates (23) are arranged on the stirring shaft (22), one end of each of the plurality of first connecting rods (24) is installed on the stirring shaft (22), and the plurality of second stirring plates (25) are installed on the other ends of the plurality of first connecting rods (24), and the stirring shaft (22) is located in the rectifying kettle (11).

4. The 3,4-difluorocynon vacuum rectification kettle according to claim 1, characterized in that, The exhaust mechanism (03) comprises a first pipeline (31), a vacuum pump (32) and a second pipeline (33), the input end of the first pipeline (31) is connected with the condensing mechanism (04), the output end of the first pipeline (31) is connected with the input end of the vacuum pump (32), the output end of the vacuum pump (32) is connected with the input end of the second pipeline (33), and the output end of the second pipeline (33) is connected with the decomposition mechanism (05).

5. A 3,4-difluorocinnamic acid vacuum rectification kettle according to claim 1, wherein The condensing mechanism (04) comprises a third pipeline (41), a condensing pipe (42), a refrigerating device (43), a baffle (44), a fourth pipeline (45), a collecting barrel (46) and a discharge pipe (47), the input end of the third pipeline (41) is connected with the outer wall of the rectifying kettle (11), the output end of the third pipeline (41) is connected with the left end of the condensing pipe (42), the input end of the condensing pipe (42) is connected with the output end of the refrigerating device (43), the output end of the condensing pipe (42) is connected with the input end of the refrigerating device (43), the refrigerating device (43) is installed on the top end of the collecting barrel (46), the baffle (44) is installed on the inner wall of the condensing pipe (42), the input end of the fourth pipeline (45) is connected with the outer wall of the condensing pipe (42), the fourth pipeline (45) is located below the baffle (44), the output end of the fourth pipeline (45) is connected with the top end of the collecting barrel (46), the input end of the discharge pipe (47) is connected with the side wall of the collecting barrel (46), and a valve is arranged on the output end of the discharge pipe (47).

6. A 3,4-difluorocinnamic acid vacuum rectification kettle according to claim 1, wherein The decomposition mechanism (05) comprises a circulating pump (51), a spray pipe (52), a decomposition barrel (53), a filter plate (54) and a fifth pipeline (55), the circulating pump (51) is installed at the top end of the decomposition barrel (53), the input end of the circulating pump (51) is connected with the output end of the decomposition solution, the input end of the spray pipe (52) is connected with the output end of the circulating pump (51), a plurality of spray heads are arranged on the output end of the spray pipe (52), the spray pipe (52) is located inside the decomposition barrel (53), the filter plate (54) is installed on the inner wall of the decomposition barrel (53), the filter plate (54) is located below the spray pipe (52), the input end of the fifth pipeline (55) is connected with the outer wall of the decomposition barrel (53), and a valve is arranged on the output end of the fifth pipeline (55).

7. A 3,4-difluorocinnamic acid vacuum rectification kettle according to claim 1, wherein The filtering mechanism (06) comprises a second motor (61), a second connecting rod (62), a filtering barrel (63), a liquid discharge barrel (64) and a sixth pipeline (65), the second motor (61) is installed at the top end of the filtering barrel (63), one end of the plurality of second connecting rods (62) is respectively installed on the output end of the second motor (61), the other end of the plurality of second connecting rods (62) is respectively installed on the filtering barrel (63), the filtering barrel (63) is located in the liquid discharge barrel (64), the lower part of the filtering barrel (63) is rotatably installed at the bottom end of the liquid discharge barrel (64), the input end of the sixth pipeline (65) is connected with the outer wall of the liquid discharge barrel (64), and a valve is arranged on the output end of the sixth pipeline (65).

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