Environment-friendly production device of 2-chloro-4-fluorobenzoic acid

Abstract

The utility model discloses an environment-friendly production device of 2-chloro-4-fluorobenzoic acid. The environment-friendly production device comprises a reaction kettle, a cooling kettle, a centrifugal machine, a drying tank and a finished product tank which are communicated with one another, the reaction kettle is communicated with a water storage tank, a catalyst storage tank, a 2-chloro-4-fluorotoluene storage tank and an oxygen storage tank; a liquid outlet of the centrifugal machine is communicated with the reaction kettle through the concentration tank; a gas distribution disc is arranged at the lower part of the reaction kettle, the gas distribution disc is communicated with a plurality of gas outlet pipes with upward openings, and the oxygen storage tank is communicated with the gas distribution disc. According to the device, oxygen is used for oxidizing 2-chloro-4-fluorotoluene, the device is safer and more environmentally friendly, centrifugal mother liquor in the production process is used mechanically after being concentrated, and the production cost of products is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of organic synthesis devices, and particularly relates to an environmental protection production device for 2-chloro-4-fluorobenzoic acid. Background Art

[0002] 2-chloro-4-fluorobenzoic acid belongs to carboxylic acid derivatives and can be used as intermediates for medicines, pesticides, and liquid crystal materials. At present, the synthesis of 2-chloro-4-fluorobenzoic acid is prepared by chlorination hydrolysis of 2-chloro-4-fluorotoluene. In the above production process, one of the raw materials involves highly toxic chlorine gas. At the same time, the chlorination reaction rate is slow, the production efficiency is low, and a large amount of hydrogen chloride waste gas is generated. In addition, in the prior art, 2-chloro-4-fluorobenzoic acid is also obtained by oxidizing 2-chloro-4-fluorotoluene with acidic potassium permanganate. This method will generate a large amount of waste water and solid waste, and at the same time, the yield is relatively low. Therefore, it is of great significance to provide an environmental protection production device for 2-chloro-4-fluorobenzoic acid to solve the above problems. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: aiming at the deficiencies existing in the prior art, an environmental protection production device for 2-chloro-4-fluorobenzoic acid is provided. The device uses oxygen to oxidize 2-chloro-4-fluorotoluene, which is safer and more environmentally friendly, and the centrifugal mother liquor in the production process is concentrated and then recycled, reducing the production cost of the product.

[0004] To solve the above technical problem, the technical solution of the utility model is:

[0005] An environmental protection production device for 2-chloro-4-fluorobenzoic acid includes a reaction kettle, a cooling kettle, a centrifuge, a drying tank, and a finished product tank that are connected; the reaction kettle is connected to a water storage tank, a catalyst storage tank, a 2-chloro-4-fluorotoluene storage tank, and an oxygen storage tank; the liquid outlet of the centrifuge is connected to the reaction kettle through a concentration tank; a gas distribution plate is provided at the lower part of the reaction kettle, and the gas distribution plate is connected to a plurality of gas outlet pipes with upward openings, and the oxygen storage tank is connected to the gas distribution plate.

[0006] Preferably, the plurality of gas outlet pipes are not arranged in parallel.

[0007] Preferably, the plurality of gas outlet pipes are provided with a plurality of auxiliary gas outlet openings on the upper side walls.

[0008] Preferably, a first weighing sensor, a second weighing sensor, and a third weighing sensor are respectively provided on the water storage tank, the catalyst storage tank, and the 2-chloro-4-fluorotoluene storage tank, and first electric valves, second electric valves, and third electric valves are respectively provided on the connecting pipes of the water storage tank, the catalyst storage tank, and the 2-chloro-4-fluorotoluene storage tank to the reaction kettle; the first weighing sensor is interlocked with the first electric valve, the second weighing sensor is interlocked with the second electric valve, and the third weighing sensor is interlocked with the third electric valve.

[0009] Preferably, a gas regulating valve is provided on the connecting pipeline between the oxygen storage tank and the air distribution plate, a pressure sensor is provided in the reaction kettle, and the pressure sensor is interlocked with the gas regulating valve.

[0010] Preferably, a preheater is further provided on the connecting pipeline between the oxygen storage tank and the reaction kettle.

[0011] Preferably, stirring devices are provided in the reaction kettle, the cooling kettle, the drying tank, and the concentration tank.

[0012] Due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows:

[0013] The present utility model provides an environmental protection production device for 2-chloro-4-fluorobenzoic acid, which includes a reaction kettle, a cooling kettle, a centrifuge, a drying tank, and a finished product tank that are connected in series; the reaction kettle is connected to a water storage tank, a catalyst storage tank, a 2-chloro-4-fluorotoluene storage tank, and an oxygen storage tank; the liquid outlet of the centrifuge is connected to the reaction kettle through a concentration tank; a gas distribution plate is provided at the lower part of the reaction kettle, and the gas distribution plate is connected with a plurality of gas outlet pipes with upward openings, and the oxygen storage tank is connected with the gas distribution plate. During the reaction, 2-chloro-4-fluorotoluene, a catalyst, and water are put into the reaction kettle, and oxygen is introduced into the reaction kettle, and the temperature is raised for an oxidation reaction. The reacted liquid material is cooled by the cooling kettle and then enters the centrifuge for centrifugation. The centrifuged precipitate is dried to obtain the finished product, and the centrifuged mother liquor is dried by the concentration tank and then enters the reaction kettle for reuse. During the above process, the generation amount and emission amount of pollutants are greatly reduced, which is more environmentally friendly. Moreover, the centrifuged mother liquor in the reaction process is reused, which not only improves the product yield but also reduces the cost.

[0014] The gas outlet pipes of the present device are not arranged in parallel, and a plurality of auxiliary gas outlet openings are provided on the side walls of the upper part of the plurality of gas outlet pipes. The above setting enables oxygen to enter the reaction kettle more evenly, make full contact reaction with the raw materials in the reaction kettle, improve the utilization rate of the raw materials, and reduce the production cost of the product.

[0015] The water storage tank, the catalyst storage tank, and the 2-chloro-4-fluorotoluene storage tank of the present device are respectively provided with a first weighing sensor, a second weighing sensor, and a third weighing sensor. The connecting pipelines between the water storage tank, the catalyst storage tank, and the 2-chloro-4-fluorotoluene storage tank and the reaction kettle are respectively provided with a first electric valve, a second electric valve, and a third electric valve; the first weighing sensor is interlocked with the first electric valve, the second weighing sensor is interlocked with the second electric valve, and the third weighing sensor is interlocked with the third electric valve. The above setting realizes the automatic addition of raw materials, improves the addition accuracy of raw materials, and further ensures the smooth progress of the reaction.

[0016] A gas regulating valve is provided on the connecting pipe between the oxygen storage tank and the gas distribution plate of the device, and a pressure sensor is provided in the reaction kettle. The pressure sensor is interlocked with the gas regulating valve. The above settings can adjust the pressure in the reaction kettle in real time to ensure the smooth progress of the oxidation reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0019] Figure 2 is Figure 1 an enlarged structural diagram of part A in

[0020] Figure 3 is Figure 1 an enlarged structural diagram of part B in

[0021] In the figure, 1. reaction kettle; 2. cooling kettle; 3. centrifuge; 4. drying tank; 5. finished product tank; 6. water storage tank; 7. catalyst storage tank; 8. 2-chloro-4-fluorotoluene storage tank; 9. oxygen storage tank; 10. concentration tank; 11. first weighing sensor; 12. second weighing sensor; 13. third weighing sensor; 14. first electric valve; 15. second electric valve; 16. third electric valve; 17. gas distribution plate; 18. air outlet pipe; 19. gas regulating valve; 20. pressure sensor; 21. auxiliary air outlet; 22. preheater; 23. stirring device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the following will further describe the solution of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] Embodiment 1

[0024] As Figures 1-3As shown in the figure, an environmentally friendly production device for 2-chloro-4-fluorobenzoic acid includes a connected reaction kettle 1, a cooling kettle 2, a centrifuge 3, a drying tank 4, and a finished product tank 5; the reaction kettle 1 is connected to a water storage tank 6, a catalyst storage tank 7, a 2-chloro-4-fluorotoluene storage tank 8, and an oxygen storage tank 9; the liquid outlet of the centrifuge 3 is connected to the reaction kettle 1 through a concentration tank 10. Through the above settings, 2-chloro-4-fluorotoluene, a catalyst, and water are added to the reaction kettle 1, and a heat exchange medium is introduced into the reaction kettle 1 through the jacket to heat the raw materials in the reaction kettle 1. Oxygen is introduced into the reaction kettle 1 through the oxygen storage tank 9, and the reaction is carried out at a certain temperature. After the reaction for a period of time, the liquid in the reaction kettle 1 enters the cooling kettle 2, and the liquid is cooled by introducing cooling water into the jacket of the cooling kettle 2. The liquid cooled to room temperature enters the centrifuge 3 for centrifugation. The centrifugal precipitate enters the drying tank 4 for drying, and the obtained finished product enters the finished product tank 5 for storage; the centrifugal mother liquor enters the concentration tank 10 for heating and concentration, and the concentrated liquid enters the reaction kettle 1 for reuse. In the above process, the production and emission of pollutants are small, greatly reducing the risk of environmental pollution. Moreover, the centrifugal mother liquor in the production process is recycled and reused, which significantly improves the product yield and also reduces the cost.

[0025] In this embodiment, the water storage tank 6, the catalyst storage tank 7, and the 2-chloro-4-fluorotoluene storage tank 8 are respectively provided with a first weighing sensor 11, a second weighing sensor 12, and a third weighing sensor 13. The connecting pipes of the water storage tank 6, the catalyst storage tank 7, and the 2-chloro-4-fluorotoluene storage tank 8 to the reaction kettle 1 are respectively provided with a first electric valve 14, a second electric valve 15, and a third electric valve 16; the first weighing sensor 11 is interlocked with the first electric valve 14, the second weighing sensor 12 is interlocked with the second electric valve 15, and the third weighing sensor 13 is interlocked with the third electric valve 16. When adding raw materials, the first weighing sensor 11, the second weighing sensor 12, and the third weighing sensor 13 can monitor the weight changes of the water storage tank 6, the catalyst storage tank 7, and the 2-chloro-4-fluorotoluene storage tank 8 in real time, so as to monitor the addition amounts of the water storage tank 6, the catalyst storage tank 7, and the 2-chloro-4-fluorotoluene storage tank 8. When the set addition amount is reached, a signal will be transmitted to an external control system (not shown in the figure), and the external control system will automatically close the first electric valve 14, the second electric valve 15, and the third electric valve 16, thereby stopping the addition of raw materials.

[0026] In this embodiment, a gas distribution plate 17 is provided at the lower part of the reaction kettle 1. The gas distribution plate 17 is connected to a plurality of gas outlet pipes 18 with upward openings, and the plurality of gas outlet pipes 18 are not parallel. The oxygen storage tank 9 is connected to the gas distribution plate 17. The settings of the gas distribution plate 17 and the gas outlet pipes 18 enable oxygen to enter the reaction kettle 1 evenly, so that oxygen can fully contact and react with the raw materials, improving the utilization rate of the raw materials and thus reducing the cost.

[0027] In this embodiment, a gas regulating valve 19 is provided on the connecting pipe between the oxygen storage tank 9 and the air distribution plate 17. A pressure sensor 20 is provided in the reaction kettle 1, and the pressure sensor 20 is interlocked with the gas regulating valve 19. The pressure sensor 20 can monitor the pressure in the reaction kettle 1 in real time. When the pressure is too high, the pressure sensor 20 transmits a signal to the external control system, and the external control system automatically reduces the gas regulating valve 19, thereby adjusting the pressure in the reaction kettle 1 to an appropriate range to ensure the smooth progress of the reaction.

[0028] Furthermore, in this embodiment, a plurality of auxiliary air outlets 21 are provided on the upper side walls of the plurality of air outlet pipes 18. The setting of the auxiliary air outlets 21 further increases the uniformity of oxygen.

[0029] Furthermore, in this embodiment, a preheater 22 is also provided on the connecting pipe between the oxygen storage tank 9 and the reaction kettle 1. The preheater 22 can preheat the oxygen and then enter the reaction kettle 1 for reaction, improving the reaction efficiency.

[0030] Furthermore, in this embodiment, stirring devices 23 are provided in the reaction kettle 1, the cooling kettle 2, the drying tank 4, and the concentration tank 10. The setting of the stirring devices 23 can enable the materials to be fully heat-exchanged and improve the production efficiency of the products.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An environmentally friendly production device for 2-chloro-4-fluorobenzoic acid, characterized in that: The invention comprises a reactor, a cooling reactor, a centrifuge, a drying tank and a finished product tank which are connected to each other; the reactor is connected to a water storage tank, a catalyst storage tank, a 2-chloro-4-fluorotoluene storage tank and an oxygen storage tank; the liquid outlet of the centrifuge is connected to the reactor through a concentration tank; a gas distribution plate is arranged at the lower part of the reactor, the gas distribution plate is connected to a plurality of gas outlet pipes with openings facing upwards, and the oxygen storage tank is connected to the gas distribution plate.

2. An environmentally friendly production device for 2-chloro-4-fluorobenzoic acid according to claim 1, characterized in that: The multiple air outlet pipes are arranged non-parallel.

3. An environmentally friendly production device for 2-chloro-4-fluorobenzoic acid according to claim 2, characterized in that: A plurality of air outlet pipes are provided with a plurality of auxiliary air outlets on the side walls of the upper parts.

4. The environmentally friendly production device of 2-chloro-4-fluorobenzoic acid according to claim 1, characterized in that: A first weighing sensor, a second weighing sensor and a third weighing sensor are respectively provided on the water storage tank, the catalyst storage tank and the 2-chloro-4-fluorotoluene storage tank, and a first electric valve, a second electric valve and a third electric valve are respectively provided on the connecting pipes between the water storage tank, the catalyst storage tank and the 2-chloro-4-fluorotoluene storage tank and the reactor; the first weighing sensor is interlocked with the first electric valve, the second weighing sensor is interlocked with the second electric valve, and the third weighing sensor is interlocked with the third electric valve.

5. The environmentally friendly production device of 2-chloro-4-fluorobenzoic acid according to claim 1, characterized in that: A gas regulating valve is provided on the connecting pipeline between the oxygen storage tank and the gas distribution plate, and a pressure sensor is provided in the reactor, and the pressure sensor is interlocked with the gas regulating valve.

6. The environmentally friendly production device of 2-chloro-4-fluorobenzoic acid according to claim 1, characterized in that: A preheater is also provided on the connecting pipe between the oxygen storage tank and the reactor.

7. The environmentally friendly production device of 2-chloro-4-fluorobenzoic acid according to claim 1, characterized in that: The reaction kettle, cooling kettle, drying tank and concentration tank are all provided with stirring devices.

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