A tail gas absorption device for p-chlorobenzotrifluoride synthesis

Abstract

The utility model relates to a chemical production technical field provides a kind of tail gas absorption device of p-chlorobenzotrifluoride synthesis, including main part, the lower surface of main part is annularly fixedly arranged with several supports, the inner wall of main part is sequentially fixedly arranged with filter plate and inclined baffle from top to bottom, U-shaped pipe is fixedly arranged between inclined baffle and filter plate, the utility model is cooperated by setting heat exchanger, second stirring blade and spray head, the gas formed by heating chlorotrifluoromethyl benzene is discharged to between filter plate and inclined baffle via U-shaped pipe, and heat exchange cooling is carried out by heat exchanger, the formation of acid gas is reduced, and the spray pipe and second stirring blade are rotated by stirring mechanism, the second stirring blade stirs the discharged gas, the alkali liquor outside is transported into spray pipe by pipe and stirring rod by exhaust pipe, and is rotated and sprayed downward by spray head, so that the alkali liquor and gas are fully mixed and absorbed, the gas concentration is greatly reduced, and the practicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and in particular to a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene. Background Technology

[0002] p-Chlorotrifluorotoluene, also known as p-chlorotrifluoromethylbenzene, 4-chlorotrifluorotoluene, p-chlorotrifluorobenzyl, or p-chlorobenzyltrifluoro, abbreviated as PCBTF, is a colorless, transparent liquid. It is insoluble in water but soluble in organic solvents such as alcohols, ethers, and benzene. Its molecular formula is C7H4F3Cl. p-Chlorotrifluorotoluene is a flammable and toxic chemical that irritates the skin and eyes. It can burn when exposed to open flames, high heat, or oxidizers, releasing toxic gases. Its main uses are as an intermediate in the production of pharmaceuticals, pesticides, and dyes.

[0003] For example, CN217939683U discloses a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene, comprising a storage tank and an absorption tank. The absorption tank is equipped with a mounting plate, which has a second mounting hole. The mounting plate is equipped with a stirring motor, which is equipped with a stirring rod. The stirring rod is equipped with a first stirring blade. The absorption tank is equipped with an exhaust pipe. The storage tank is equipped with an annular plate, which is equipped with a frustum. The annular plate has a third mounting hole. The exhaust pipe is equipped with an operating motor, which has an exhaust port. The frustum is equipped with activated carbon. The above-mentioned tail gas absorption device for the synthesis of p-chlorotrifluorotoluene solves the problem that existing tail gas absorption devices for the synthesis of p-chlorotrifluorotoluene mostly have a single post-absorption treatment method, which cannot effectively remove harmful substances in the tail gas and pollute the surrounding environment and affect people's health after emission.

[0004] However, in the existing technology, traditional exhaust gas absorption devices have limited absorption rates for mixed acidic gases, and it is difficult to consistently meet emission standards, which limits the practicality of the devices to a certain extent. Utility Model Content

[0005] The purpose of this invention is to solve the problem that traditional exhaust gas absorption devices in the prior art have limited absorption rates for mixed acidic gases, making it difficult to consistently meet emission standards.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene, comprising a main body, wherein a plurality of supports are fixedly arranged in a ring on the lower surface of the main body, a filter plate and an inclined baffle are fixedly arranged sequentially from top to bottom on the inner wall of the main body, a U-shaped tube is fixedly arranged between the inclined baffle and the filter plate, a heat exchanger is fixedly arranged between the inclined baffle and the filter plate on the inner wall of the main body, and the heat exchanger is fixedly connected to the surface of the U-shaped tube, a stirring rod is rotatably arranged at the center of the inner cavity of the main body, a plurality of second stirring blades are fixedly arranged in a ring on the surface of the stirring rod between the inclined baffle and the filter plate, a spray pipe is fixedly arranged on the surface of the stirring rod above the filter plate, a plurality of spray heads are fixedly arranged in a ring on the lower surface of the spray pipe, a pump body is fixedly arranged on one side of the upper surface of the main body, the output end of the pump body is movably connected to the top of the stirring rod through a conduit, a flow cavity is opened inside the stirring rod to facilitate the flow of alkaline solution into the spray pipe, and a stirring component is arranged on the other side of the upper surface of the main body.

[0007] In a preferred embodiment, the stirring component includes a fixed frame fixedly disposed on the upper surface of the main body, a stirring motor fixedly disposed on the upper surface of the fixed frame, and a second drive wheel being driven at the output end of the stirring motor.

[0008] In a preferred embodiment, a first drive wheel is fixedly disposed on the surface of the stirring rod above the main body, and the first drive wheel is meshed and connected to a second drive wheel.

[0009] In a preferred embodiment, a plurality of first stirring blades are fixedly arranged in a ring below the surface of the stirring rod, and an exhaust pipe is fixedly arranged on the upper surface of the main body near the pump body, with activated carbon disposed inside the exhaust pipe.

[0010] In a preferred embodiment, an inlet pipe is fixedly installed on the outer side wall of the main body at a position below the inclined baffle, and a first solenoid valve is installed on the surface of the inlet pipe.

[0011] In a preferred embodiment, a drain pipe is fixedly installed on the outer side wall of the main body between the inclined baffle and the filter plate, and a second solenoid valve is installed on the surface of the drain pipe.

[0012] In a preferred embodiment, a discharge pipe is fixedly provided at the center of the lower surface of the main body, and a third solenoid valve is provided on the surface of the discharge pipe.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] This invention utilizes a heat exchanger, a second stirring blade, and a spray head in a coordinated manner. The gas generated by heating chlorotrifluorotoluene is discharged through a U-shaped tube between the filter plate and the inclined baffle. The gas is cooled by heat exchange in the heat exchanger, reducing the formation of acidic gas. The stirring mechanism drives the spray pipe and the second stirring blade to rotate, and the second stirring blade agitates the discharged gas. The exhaust pipe transports external alkaline solution to the spray pipe through a conduit and stirring rod, and sprays it downwards through the spray head. This allows the alkaline solution to fully mix and absorb the gas, significantly reducing the gas concentration and improving the practicality of the device. Attached Figure Description

[0015] Figure 1 A three-dimensional cross-sectional view of a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene provided by this utility model;

[0016] Figure 2 A front view of a three-dimensional structure of a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene provided by this utility model;

[0017] Figure 3 A three-dimensional structural schematic diagram of a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene provided by this utility model;

[0018] Figure 4 This utility model provides a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene. Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0019] Legend:

[0020] 1. Main body; 2. Support; 3. Inlet pipe; 4. First solenoid valve; 5. Drain pipe; 6. Second solenoid valve; 7. Discharge pipe; 8. Third solenoid valve; 9. Inclined baffle; 10. Filter plate; 11. Heat exchanger; 12. U-tube; 13. Stirring rod; 14. First stirring blade; 15. Second stirring blade; 16. Spray pipe; 17. Spray head; 18. First drive wheel; 19. Pump body; 20. Guide tube; 21. Exhaust pipe; 22. Fixing frame; 23. Stirring motor; 24. Second drive wheel. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4This utility model provides a technical solution: a tail gas absorption device for the synthesis of p-chlorotrifluorotoluene, comprising a main body 1, with a plurality of supports 2 fixedly arranged in a ring on the lower surface of the main body 1, a filter plate 10 and an inclined baffle 9 fixedly arranged sequentially from top to bottom on the inner wall of the main body 1, a U-shaped tube 12 fixedly arranged between the inclined baffle 9 and the filter plate 10, a heat exchanger 11 fixedly arranged between the inclined baffle 9 and the filter plate 10 on the inner wall of the main body 1, and the heat exchanger 11 being fixedly connected to the surface of the U-shaped tube 12, a stirring rod 13 rotatably arranged at the center of the inner cavity of the main body 1, a plurality of second stirring blades 15 fixedly arranged in a ring on the surface of the stirring rod 13 between the inclined baffle 9 and the filter plate 10, a spray pipe 16 fixedly arranged on the surface of the stirring rod 13 above the filter plate 10, and a plurality of spray heads 1 fixedly arranged in a ring on the lower surface of the spray pipe 16. 7. A pump body 19 is fixedly installed on one side of the upper surface of the main body 1. The output end of the pump body 19 is movably connected to the top of the stirring rod 13 through the conduit 20. The interior of the stirring rod 13 is opened into a flow cavity to facilitate the flow of alkaline solution into the spray pipe 16. A stirring component is installed on the other side of the upper surface of the main body 1. The gas formed by heating chlorotrifluorotoluene will be discharged through the U-shaped pipe 12 to the space between the filter plate 10 and the inclined baffle 9, and cooled by heat exchanger 11 to reduce the formation of acidic gas. The stirring mechanism drives the spray pipe 16 and the second stirring blade 15 to rotate. The second stirring blade 15 stirs the discharged gas. The exhaust pipe 21 transports the external alkaline solution to the spray pipe 16 through the conduit 20 and the stirring rod 13, and sprays it out downward through the spray head 17, so that the alkaline solution and the gas are fully mixed and absorbed, greatly reducing the gas concentration.

[0023] like Figure 1-4 As shown, the stirring component includes a fixed frame 22 fixedly mounted on the upper surface of the main body 1. A stirring motor 23 is fixedly mounted on the upper surface of the fixed frame 22. A second drive wheel 24 is driven to the output end of the stirring motor 23. A first drive wheel 18 is fixedly mounted on the surface of the stirring rod 13 above the main body 1, and the first drive wheel 18 is meshed with the second drive wheel 24. Several first stirring blades 14 are fixedly arranged in a ring below the surface of the stirring rod 13. An exhaust pipe 21 is fixedly mounted on the upper surface of the main body 1 near the pump body 19. Activated carbon is installed inside the exhaust pipe 21. The stirring motor 23 drives the stirring rod 13 to rotate through the second drive wheel 24. With the ring-arranged first stirring blades 14 and second stirring blades 15, thorough and uniform stirring can be achieved, improving mixing efficiency. At the same time, the exhaust pipe 21 with built-in activated carbon on the main body 1 can effectively adsorb and purify the waste gas generated during the stirring process, reducing environmental pollution. The overall device operates stably and has good performance.

[0024] like Figure 1-4As shown, an inlet pipe 3 is fixedly installed on the outer wall of the main body 1 below the inclined baffle 9. A first solenoid valve 4 is installed on the surface of the inlet pipe 3. A drain pipe 5 is fixedly installed on the outer wall of the main body 1 between the inclined baffle 9 and the filter plate 10. A second solenoid valve 6 is installed on the surface of the drain pipe 5. A discharge pipe 7 is fixedly installed at the center of the lower surface of the main body 1. A third solenoid valve 8 is installed on the surface of the discharge pipe 7. The inlet pipe 3, drain pipe 5, and discharge pipe 7 are respectively set in reasonable positions and are controlled in conjunction with the first solenoid valve 4, the second solenoid valve 6, and the third solenoid valve 8. This enables precise adjustment of the inlet, outlet, and discharge processes, and facilitates operation. At the same time, segmented control avoids cross-interference of liquids and improves the safety and automation level of the system operation.

[0025] Working principle: In use, the first solenoid valve 4 is opened to inject the chlorotrifluorotoluene solution into the bottom of the main body 1 through the inlet pipe 3. The heating module heats the chlorotrifluorotoluene solution, while the stirring motor 23 drives the second drive wheel 24 to rotate. The second drive wheel 24 drives the stirring rod 13 to rotate through the first drive wheel 18. The stirring rod 13 drives the spray pipe 16, the second stirring blade 15, and the first stirring blade 14 to rotate. The first stirring blade 14 stirs the chlorotrifluorotoluene solution, enhancing its crystallization efficiency. The resulting harmful gases are discharged through the U-shaped pipe 12 between the filter plate 10 and the inclined baffle 9, and cooled by heat exchanger 11, reducing the formation of acidic gases. The second stirring blade 15 stirs the discharged gases. The external alkaline solution is installed at the input end of the pump body 19. With the start of the exhaust pipe 21, the external alkaline solution is transported to the spray pipe 16 through the conduit 20 and the stirring rod 13, and sprayed out through the downward rotating spray head 17, so that the alkaline solution and the gas are fully mixed and absorbed, greatly reducing the gas concentration. The harmful substances in the gas are absorbed with the alkaline solution and precipitated on the upper surface of the inclined baffle 9. With the opening of the second solenoid valve 6, they are discharged to the outside through the drain pipe 5. The remaining gas that meets the emission standards will be discharged to the outside through the exhaust pipe 21 through the activated carbon. The harmful gas is discharged between the inclined baffle 9 and the filter plate 10, which can filter some of the harmful substances and enhance the absorption rate of the alkaline solution. The whole process is convenient to use, has a high absorption rate, and is suitable for large-scale application and promotion.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A tail gas absorption device for the synthesis of p-chlorotrifluorotoluene, comprising a main body (1), characterized in that: The lower surface of the main body (1) is fixedly provided with several supports (2) in a ring shape. The inner wall of the main body (1) is fixedly provided with a filter plate (10) and an inclined baffle (9) from top to bottom. A U-shaped tube (12) is fixedly provided between the inclined baffle (9) and the filter plate (10). A heat exchanger (11) is fixedly provided between the inclined baffle (9) and the filter plate (10) on the inner wall of the main body (1), and the heat exchanger (11) is fixedly connected to the surface of the U-shaped tube (12). A stirring rod (13) is rotatably provided at the center of the inner cavity of the main body (1), and the surface of the stirring rod (13) is located between the inclined baffle (9) and the filter plate (10). A number of second stirring blades (15) are fixedly arranged in a ring. A spray pipe (16) is fixedly arranged on the surface of the stirring rod (13) above the filter plate (10). A number of spray heads (17) are fixedly arranged in a ring on the lower surface of the spray pipe (16). A pump body (19) is fixedly arranged on one side of the upper surface of the main body (1). The output end of the pump body (19) is movably connected to the top of the stirring rod (13) through a conduit (20). A flow cavity is opened inside the stirring rod (13) to facilitate the flow of alkaline solution into the spray pipe (16). A stirring component is arranged on the other side of the upper surface of the main body (1).

2. The tail gas absorption device for the synthesis of p-chlorotrifluorotoluene according to claim 1, characterized in that: The stirring component includes a fixed frame (22) fixedly mounted on the upper surface of the main body (1), and a stirring motor (23) is fixedly mounted on the upper surface of the fixed frame (22). A second drive wheel (24) is driven at the output end of the stirring motor (23).

3. The tail gas absorption device for the synthesis of p-chlorotrifluorotoluene according to claim 1, characterized in that: The stirring rod (13) is fixedly provided with a first drive wheel (18) above the main body (1), and the first drive wheel (18) is meshed with the second drive wheel (24) for transmission.

4. The tail gas absorption device for the synthesis of p-chlorotrifluorotoluene according to claim 1, characterized in that: A plurality of first stirring blades (14) are fixedly arranged in a ring below the surface of the stirring rod (13). An exhaust pipe (21) is fixedly arranged on the upper surface of the main body (1) near the pump body (19). Activated carbon is arranged inside the exhaust pipe (21).

5. The tail gas absorption device for the synthesis of p-chlorotrifluorotoluene according to claim 1, characterized in that: The main body (1) has an inlet pipe (3) fixedly installed on its outer side wall below the inclined baffle (9), and a first solenoid valve (4) is installed on the surface of the inlet pipe (3).

6. The tail gas absorption device for the synthesis of p-chlorotrifluorotoluene according to claim 1, characterized in that: A drain pipe (5) is fixedly installed on the outer wall of the main body (1) between the inclined baffle (9) and the filter plate (10), and a second solenoid valve (6) is installed on the surface of the drain pipe (5).

7. The tail gas absorption device for the synthesis of p-chlorotrifluorotoluene according to claim 1, characterized in that: A discharge pipe (7) is fixedly installed at the center of the lower surface of the main body (1), and a third solenoid valve (8) is installed on the surface of the discharge pipe (7).

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