A device for separating and recovering waste liquid in trifluoromethyl benzonitrile production process

Abstract

The utility model discloses a kind of waste liquid separation and recovery devices in trifluoromethyl benzonitrile production process, including rectifying column, input pipe is installed in rectifying column side, lifting pump is installed in input pipe bottom, input pipe bottom end is connected with the top side of separation tank fixedly, the bottom of separation tank one side is fixed with liquid inlet pipe, booster pump is installed on liquid inlet pipe, the inner wall of separation tank one side is fixed with first baffle, the inner wall of separation tank other side is fixed with second baffle, the top of first baffle is fixed with first separation net, the bottom of second baffle is fixed with second separation net, top window is arranged in the top center of separation tank.The waste liquid separation and recovery device in trifluoromethyl benzonitrile production process adopts novel structure design, not only can the solid impurities in waste liquid be efficiently intercepted, and main adsorption filter mechanism can be conveniently disassembled and cleaned, so that the overall filter structure can work stably for a long time.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a waste liquid separation and recovery device in the production process of trifluoromethylbenzonitrile. Background Technology

[0002] In the production process of p-trifluoromethylbenzonitrile, the waste liquid usually contains unreacted raw materials, by-products, solvents, catalyst residues and high-boiling-point impurities. Efficient separation of these waste liquids is crucial for environmental protection, cost control and resource recovery.

[0003] Currently, distillation columns are used to separate and recover waste liquid from the production of trifluoromethylbenzonitrile. However, distillation columns cannot efficiently separate solid impurities in the waste liquid, such as copper salts and palladium catalysts. Direct distillation of the waste liquid results in solid impurities remaining inside the distillation column, affecting its normal operation. Therefore, a waste liquid separation and recovery device for the production of trifluoromethylbenzonitrile needs to be designed to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide a waste liquid separation and recovery device in the production process of trifluoromethylbenzonitrile, so as to solve the problem mentioned in the background art that the distillation column cannot efficiently separate solid impurities such as copper salts and palladium catalysts in the waste liquid, and that direct distillation of the waste liquid will cause solid impurities to remain inside the distillation column, affecting the normal operation of the distillation column.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste liquid separation and recovery device for the production of trifluoromethylbenzonitrile, comprising a distillation column, an input pipe installed on one side of the distillation column, a booster pump installed at the bottom of the input pipe, the bottom end of the input pipe being connected and fixed to one side of the top of a separation tank, an inlet pipe fixed to the bottom of one side of the separation tank, a booster pump installed on the inlet pipe, a first partition plate fixed to one side of the inner wall of the separation tank, a second partition plate fixed to the other side of the inner wall of the separation tank, a first dividing mesh fixed to the top of the first partition plate, a second dividing mesh fixed to the bottom of the second partition plate, a top window opened at the center of the top of the separation tank, an installation seat installed inside the top window, a lifting ring fixed to the top surface of the installation seat, a sealing gasket fixedly installed at the contact point between the installation seat and the top surface of the separation tank, the bottom end of the installation seat being connected and fixed to the top of the mesh frame, the mesh frame being disposed between the first and second partition plates, and activated carbon disposed inside the mesh frame.

[0006] Preferably, the first partition and the first dividing net are centrally symmetrically distributed about the center of the separation box, and the distance between the first partition and the second partition is greater than half the inner length of the separation box.

[0007] Preferably, a filter screen is fixed between one side of the first partition and the inner wall of one side of the separation box, and the filter screen is evenly distributed in the vertical direction.

[0008] Preferably, the front view cross-sectional shape of the mounting base is "T" shaped, and the mounting base and the top window are connected by a snap-fit ​​connection.

[0009] Preferably, the outer side of the mesh frame is in close contact with the inner wall of the separation box, the side of the first partition, and the side of the second partition, and the mesh diameter of the mesh frame is smaller than the mesh diameter of the first separating mesh.

[0010] Preferably, a porous ceramic packing is provided between one side of the second partition and the inner wall of the other side of the separation box, and the overall volume of the porous ceramic packing is greater than 3 / 4 of the volume between one side of the second partition and the inner wall of the other side of the separation box.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the waste liquid separation and recovery device in the production process of p-trifluoromethylbenzonitrile adopts a novel structural design, which can not only efficiently intercept solid impurities in the waste liquid, but also the main adsorption and filtration mechanism can be easily disassembled and cleaned, so that the overall filtration structure can work stably for a long time.

[0012] 1. Through the structural design of the first partition, the second partition, the first separation mesh, and the second separation mesh, the retention time of waste liquid in the separation tank is extended. Combined with filter screen, activated carbon, and porous ceramic packing, the efficient interception of solid impurities in the waste liquid is achieved.

[0013] 2. The structural design of the top window, mounting base, lifting ring and sealing gasket allows the mesh frame to be installed stably and sealed and easily disassembled, making it easy to clean or replace the activated carbon inside the mesh frame and ensuring that the overall filtration efficiency of the device can be maintained at a high level. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of the present invention;

[0015] Figure 2 This is a front view cross-sectional structural diagram of the separation box of this utility model;

[0016] Figure 3 This is a top view of the separation box structure of this utility model;

[0017] Figure 4 This is a top view cross-sectional structural diagram of the separation box of this utility model.

[0018] In the diagram: 1. Distillation column; 2. Inlet pipe; 3. Booster pump; 4. Separator; 5. Liquid inlet pipe; 6. Booster pump; 7. First baffle; 8. Second baffle; 9. First separator mesh; 10. Second separator mesh; 11. Filter screen; 12. Top window; 13. Mounting base; 14. Lifting ring; 15. Sealing gasket; 16. Mesh frame; 17. Activated carbon; 18. Porous ceramic packing. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a waste liquid separation and recovery device for the production of trifluoromethylbenzonitrile, comprising a distillation column 1, an input pipe 2, a booster pump 3, a separation tank 4, a liquid inlet pipe 5, a booster pump 6, a first partition 7, a second partition 8, a first separator 9, a second separator 10, a filter screen 11, a top window 12, a mounting base 13, a lifting ring 14, a sealing gasket 15, a mesh frame 16, activated carbon 17, and porous ceramic packing 18. An input pipe 2 is installed on one side of the distillation column 1, and a booster pump 3 is installed at the bottom of the input pipe 2. The bottom end of the input pipe 2 is connected and fixed to one side of the top of the separation tank 4. A liquid inlet pipe 5 is fixed to the bottom of one side of the separation tank 4. A booster pump 6 is installed on the inlet pipe 5. A first partition 7 is fixed on one side of the inner wall of the separation box 4, and a second partition 8 is fixed on the other side of the inner wall of the separation box 4. A first partition net 9 is fixed on the top of the first partition 7, and a second partition net 10 is fixed on the bottom of the second partition 8. A top window 12 is opened at the center of the top of the separation box 4. An installation seat 13 is installed in the top window 12. A lifting ring 14 is fixed on the top surface of the installation seat 13. A sealing gasket 15 is fixed at the joint between the installation seat 13 and the top surface of the separation box 4. The bottom end of the installation seat 13 is connected and fixed to the top end of the mesh frame 16. The mesh frame 16 is set between the first partition 7 and the second partition 8. Activated carbon 17 is set inside the mesh frame 16.

[0021] In this example, the first partition 7 and the first partition net 9, along with the second partition 8 and the second partition net 10, are all centrally symmetrical about the center of the separation box 4. The distance between the first partition 7 and the second partition 8 is greater than half the inner length of the separation box 4. The above structural design can separate the space inside the separation box 4 and extend the retention time of waste liquid.

[0022] A filter screen 11 is fixed between one side of the first partition 7 and the inner wall of one side of the separation box 4. The filter screens 11 are evenly distributed in the vertical direction. The above structural design can efficiently intercept large particulate impurities in the waste liquid.

[0023] The front view of the mounting base 13 has a "T" shaped cross section. The mounting base 13 and the top window 12 are connected by a snap-fit ​​connection. The above structural design allows the mounting base 13 to be installed stably, providing a stable installation foundation for the grid frame 16.

[0024] The outer side of the mesh frame 16 is in close contact with the inner wall of the separation box 4, the side of the first partition 7 and the side of the second partition 8. The mesh diameter of the mesh frame 16 is smaller than the mesh diameter of the first partition mesh 9. The above structural design ensures that the mesh frame 16 can be installed stably and that the waste liquid can pass through the mesh frame 16 and come into full contact with the activated carbon 17 inside.

[0025] A porous ceramic packing 18 is provided between one side of the second partition 8 and the inner wall of the other side of the separation box 4. The overall volume of the porous ceramic packing 18 is greater than 3 / 4 of the volume between one side of the second partition 8 and the inner wall of the other side of the separation box 4. The above structural design can effectively adsorb and retain small particulate impurities remaining in the waste liquid, ensuring the filtration and separation effect.

[0026] Working principle: During operation, the booster pump 6 is started and the waste liquid is sent into the inlet pipe 5. Figure 2 In the space to the left of the first partition 7 inside the intermediate separation tank 4, the waste liquid passes through the filter screen 11 from bottom to top. The filter screen 11 intercepts large particulate impurities. Then the waste liquid passes through the first partition screen 9 and enters the space between the first partition 7 and the second partition 8. It passes through the mesh frame 16 and comes into contact with the activated carbon 17. The activated carbon 17 adsorbs and intercepts small particulate impurities, i.e., other adsorbable substances. The waste liquid flows downward through the activated carbon 17 and enters the space to the right of the second partition 8 from the second partition screen 10. Under the pressure provided by the booster pump 6, it moves upward and comes into contact with the porous ceramic packing 18. The porous ceramic packing 18 adsorbs and intercepts small particulate impurities, i.e., other adsorbable substances, again.

[0027] When the waste liquid floats above the top surface of the porous ceramic packing 18, the booster pump 3 is started, and the filtered and separated waste liquid is sent to the distillation column 1 for distillation separation through the input pipe 2. During maintenance, the bolts installed on the edge of the mounting base 13 can be removed, and the mounting base 13 and the mesh frame 16 can be lifted vertically through the lifting ring 14. The activated carbon 17 is cleaned and replaced, and then the mounting base 13 and the mesh frame 16 are installed and fixed in place, and the device can be used again. This is the working principle of the waste liquid separation and recovery device in the production process of p-trifluoromethylbenzonitrile.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste liquid separation and recovery device for the production of p-trifluoromethylbenzonitrile, comprising a distillation column (1), characterized in that: An input pipe (2) is installed on one side of the distillation column (1), and a booster pump (3) is installed at the bottom of the input pipe (2). The bottom end of the input pipe (2) is connected and fixed to the top side of the separation tank (4). An inlet pipe (5) is fixed at the bottom of one side of the separation tank (4), and a booster pump (6) is installed on the inlet pipe (5). A first partition (7) is fixed on one side of the inner wall of the separation tank (4), and a second partition (8) is fixed on the other side of the inner wall of the separation tank (4). A first partition net (9) is fixed on the top of the first partition (7), and the second partition (8)... A second partition net (10) is fixed at the bottom. A top window (12) is opened at the center of the top of the separation box (4). An installation seat (13) is installed in the top window (12). A lifting ring (14) is fixed on the top surface of the installation seat (13). A sealing gasket (15) is fixed at the joint between the installation seat (13) and the top surface of the separation box (4). The bottom end of the installation seat (13) is connected and fixed to the top end of the mesh frame (16). The mesh frame (16) is set between the first partition (7) and the second partition (8). Activated carbon (17) is set inside the mesh frame (16).

2. The waste liquid separation and recovery device in the production process of p-trifluoromethylbenzonitrile according to claim 1, characterized in that: The first partition (7) and the first partition net (9) are symmetrically distributed about the center of the separation box (4) with respect to the second partition (8) and the second partition net (10). The distance between the first partition (7) and the second partition (8) is greater than half the length of the inner side of the separation box (4).

3. The waste liquid separation and recovery device in the production process of p-trifluoromethylbenzonitrile according to claim 1, characterized in that: A filter screen (11) is fixed between one side of the first partition (7) and the inner wall of one side of the separation box (4), and the filter screen (11) is evenly distributed in the vertical direction.

4. The waste liquid separation and recovery device in the production process of p-trifluoromethylbenzonitrile according to claim 1, characterized in that: The front view of the mounting base (13) is T-shaped, and the mounting base (13) and the top window (12) are connected by a snap-fit.

5. The waste liquid separation and recovery device in the production process of p-trifluoromethylbenzonitrile according to claim 1, characterized in that: The outer side of the wire frame (16) is in close contact with the inner wall of the separation box (4), the side of the first partition (7) and the side of the second partition (8), and the mesh diameter of the wire frame (16) is smaller than the mesh diameter of the first separating wire (9).

6. The waste liquid separation and recovery device in the production process of p-trifluoromethylbenzonitrile according to claim 1, characterized in that: A porous ceramic filler (18) is provided between one side of the second partition (8) and the inner wall of the other side of the separation box (4). The overall volume of the porous ceramic filler (18) is greater than 3 / 4 of the volume between one side of the second partition (8) and the inner wall of the other side of the separation box (4).

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