A device for extracting and separating nitrated waste acid

Abstract

The utility model discloses a kind of nitration waste acid extraction separation devices, it is related to chemical separation technical field, to solve the problem of complex operation and large floor space in traditional waste acid extraction process equipment, the device includes kettle body and the separator and agitator sequentially arranged along the height direction of kettle body, separator includes at least one layer annular separation structure, separation structure includes sequentially arranged feed stabilizing flow tank, overflow tank and discharge port along annular, feed stabilizing flow tank is equipped with annularly arranged inclined baffle, inclined baffle and the slot bottom of feed stabilizing flow tank have included angle;So set, through integrated design, simplify equipment structure, reduce equipment floor space, improve space utilization efficiency, so that operation and maintenance are more convenient.

Description

Technical Field

[0001] This utility model relates to the field of chemical separation technology, and more specifically, to a nitration waste acid extraction and separation device. Background Technology

[0002] Nitration is a crucial chemical reaction in modern chemical industry, widely used in the production of numerous chemical products such as dyes and pharmaceuticals. During nitration, nitrated waste acid is generated, and the effective extraction and separation of this waste acid is a key step in achieving resource recovery and environmental protection.

[0003] In traditional waste acid extraction processes, multiple stirred tanks and separators are typically connected in series. The stirred tanks are mainly used to bring the mixed dinitrobenzene to the required performance through acid washing, alkali washing, and water washing steps; the separators are responsible for separating the mixed acid and water from the mixed dinitrobenzene. Although this equipment can achieve basic nitration and separation functions, its separate equipment layout requires a large number of devices, resulting in a large footprint and increased complexity and cumbersome operation.

[0004] Therefore, how to solve the problems of cumbersome equipment, large footprint and complicated operation in traditional waste acid extraction processes is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a nitration waste acid extraction and separation device. Through integrated design, the device structure is simplified, the equipment floor space is reduced, the space utilization efficiency is improved, and the operation and maintenance are made easier.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A nitration waste acid extraction and separation device includes: a vessel body and a separator and a stirrer arranged sequentially along the height direction of the vessel body. The separator includes at least one annular separation structure. The separation structure includes a feed stabilizing tank, an overflow tank and a discharge port arranged sequentially along the annular shape. The feed stabilizing tank is provided with an inclined baffle arranged in an annular shape. The inclined baffle has an angle with the bottom of the feed stabilizing tank.

[0008] Preferably, a buffer zone, a stratification zone, and a separation zone are sequentially arranged inside the feed stabilization tank. The buffer zone is connected to a feed pipe, and the separation zone is connected to a discharge pipe.

[0009] Preferably, multiple inclined partitions are provided, and the multiple inclined partitions are equally spaced in the layered area along the diameter direction of the separation structure.

[0010] Preferably, the angle between the inclination direction of the inclined partition and the diameter direction of the separation structure is 30-45 degrees.

[0011] Preferably, the separation structure has three layers, which are spaced apart along the height of the vessel body, and the discharge port of the upper layer of the separation structure corresponds to the feed stabilizing trough of the lower layer of the separation structure, so that the flow path of the material is circular.

[0012] Preferably, the agitator includes a stirring motor, a stirring shaft, and a stirring paddle. The stirring shaft is used to connect the stirring motor and the stirring paddle. The stirring motor is located at the top of the vessel, and the stirring paddle is located near the bottom of the vessel.

[0013] Preferably, it also includes an elevator and a discharge trough disposed inside the vessel body. The elevator is disposed on the stirring shaft and located above the stirring paddle. The discharge trough is fitted with the outer periphery of the elevator with a clearance. The elevator is used to lift the material from the stirrer to the discharge trough. The discharge trough is connected to the discharge pipe.

[0014] Preferably, the outer diameter of the discharge trough is smaller than the inner diameter of the separator.

[0015] Preferably, it also includes a tube heat exchanger located inside the vessel body, with the cooling water inlet of the tube heat exchanger located near the bottom of the vessel body.

[0016] Preferably, the bottom of the vessel is provided with a drain port.

[0017] The nitration waste acid extraction and separation device provided by this utility model includes a vessel body and a separator and a stirrer arranged sequentially along the height of the vessel body. Integrating the separator and stirrer into a single vessel body achieves an integrated design, effectively reducing the equipment's footprint, lowering the requirements for production space, and improving space utilization efficiency. The separator includes at least one annular separation structure, which extends the flow path of the material within the separator, providing more space and time for the natural stratification of acid and organic matter. This design fully utilizes the natural stratification characteristics of the medium during flow, significantly improving the stratification effect by increasing the flow channel length, ensuring a more thorough and efficient separation process. The annular structure also reduces material turbulence, making stratification smoother and improving separation quality.

[0018] The separation structure includes a feed stabilizing tank, an overflow tank, and a discharge port arranged sequentially in a ring. The zoned design of these components effectively controls the flow of materials within the separation structure, ensuring a smooth entry into the feed stabilizing tank. After effective stratification within the tank, the material flows orderly into the overflow tank and finally exits from the discharge port. Furthermore, the feed stabilizing tank is equipped with annular inclined baffles, optimizing the stratification process. The separation of mixed acid and organic matter primarily relies on gravity, while the inclined baffles effectively reduce the liquid thickness, accelerating the stratification speed and improving separation efficiency, making the separation process faster and more precise. The angle between the inclined baffles and the bottom of the feed stabilizing tank further optimizes the stratification effect.

[0019] The nitration waste acid extraction and separation device designed in the above manner integrates the separator and agitator into the same vessel, which can effectively reduce the equipment footprint, lower the requirements for the production site, and improve space utilization efficiency. Through integrated design, the equipment structure is simplified, making operation and maintenance more convenient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of the nitration waste acid extraction and separation device provided by this utility model;

[0022] Figure 2 This is a top view of the nitration waste acid extraction and separation device provided by this utility model;

[0023] Figure 3 This is a partial structural schematic diagram of the nitration waste acid extraction and separation device provided by this utility model.

[0024] Figure label:

[0025] 1-The vessel body;

[0026] 2-Separator, 21-Separation structure, 211-Feed flow stabilizer, 212-Overflow trough, 213-Discharge port, 22-Inclined baffle;

[0027] 3-Agitator, 31-Agitator motor, 32-Agitator shaft, 33-Agitator paddle;

[0028] 4-Infeed pipe;

[0029] 5-Important material discharge pipe;

[0030] 6- Lifter;

[0031] 7-Discharge chute;

[0032] 8-Discharge pipe;

[0033] 9-Shell-tube heat exchanger;

[0034] 10-Drain port. Detailed Implementation

[0035] 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.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] It should be noted that the directional terms such as "up" and "down" in the following text are defined based on the accompanying drawings in the instruction manual.

[0038] The core of this utility model is to provide a nitration waste acid extraction and separation device. Through integrated design, the equipment structure is simplified, the equipment floor space is reduced, the space utilization efficiency is improved, and the operation and maintenance are made easier.

[0039] Please refer to Figure 1 , Figure 2 and Figure 3 A nitrification waste acid extraction and separation device includes a vessel body 1 and a separator 2 and a stirrer 3 arranged sequentially along the height of the vessel body 1. Integrating the separator 2 and stirrer 3 within a single vessel body 1 achieves an integrated design, effectively reducing the equipment's footprint, lowering the requirements for production space, and improving space utilization efficiency. The separator 2 includes at least one annular separation structure 21, which extends the flow path of the material within the separator 2, providing more space and time for the natural stratification of acid and organic matter. This design fully utilizes the natural stratification characteristics of the medium during flow, significantly improving the stratification effect by increasing the flow channel length, ensuring a more thorough and efficient separation process. The annular structure also reduces material turbulence, making stratification smoother and improving separation quality.

[0040] The separation structure 21 includes a feed stabilizing trough 211, an overflow trough 212, and a discharge port 213 arranged sequentially in a ring. The partitioned design of the feed stabilizing trough 211, overflow trough 212, and discharge port 213 can effectively control the flow state of materials within the separation structure 21, ensuring that materials smoothly enter the feed stabilizing trough 211, undergo effective stratification within the feed stabilizing trough 211, and then orderly enter the overflow trough 212 before finally flowing out from the discharge port 213. Furthermore, the feed stabilizing trough 211 is equipped with a ring-shaped inclined baffle 22, which optimizes the stratification process. The separation of mixed acid and organic matter mainly relies on gravity, while the inclined baffle 22 can effectively reduce the thickness of the liquid, accelerate the stratification speed, improve separation efficiency, and make the separation process faster and more precise. The inclined baffle 22 has an angle with the bottom of the feed stabilizing trough 211, which can further optimize the stratification effect of the materials.

[0041] Specifically, the height of the baffle between the feed stabilizing trough 211 and the discharge port 213 is higher than the height of the baffle between the feed stabilizing trough 211 and the overflow trough 212, and the height of the baffle between the feed stabilizing trough 211 and the overflow trough 212 is higher than the height of the baffle between the overflow trough 212 and the discharge port 213. In other words, the heights of the baffles between the discharge port 213 and the feed stabilizing trough 211, between the feed stabilizing trough 211 and the overflow trough 212, and between the overflow trough 212 and the discharge port 213 decrease sequentially. The baffle between the feed stabilizing trough 211 and the discharge port 213 has the highest height to ensure maximum material throughput. The baffle between the feed stabilizing trough 211 and the overflow trough 212 has the next highest height to ensure smooth material flow from the feed stabilizing trough 211 into the overflow trough 212, reducing resistance during flow and allowing for a more stable entry of material into the overflow trough 212. The baffle between the overflow trough 212 and the discharge port 213 has the lowest possible height, ensuring that the separated light materials can flow smoothly from the overflow trough 212 to the discharge port 213. This reduces the resistance during material flow, allowing the material to be discharged more quickly and improving the overall operating efficiency of the device. The height of each baffle can be designed according to the ratio of light to heavy materials, as long as it effectively prevents heavy materials from flowing into the discharge port 213.

[0042] Furthermore, the material has sufficient residence time in the feed stabilizing tank 211 for initial stratification, ensuring that acid and organic matter are initially separated before entering the overflow tank 212. After overflowing into the overflow tank 212, the material undergoes further stratification, optimizing the stratification effect. The baffle height between the overflow tank 212 and the discharge port 213 is minimized, ensuring that the separated material flows stably towards the discharge port 213, reducing backflow within the overflow tank 212, and ensuring stable discharge of the separated material, further improving separation efficiency.

[0043] The nitration waste acid extraction and separation device set up in the above manner integrates the separator 2 and the agitator 3 into the same vessel 1, which can effectively reduce the equipment footprint, reduce the requirements for the production site, and improve the space utilization efficiency. Through the integrated design, the equipment structure is simplified, making operation and maintenance more convenient.

[0044] In the above embodiment, a buffer zone, a stratification zone, and a separation zone are sequentially arranged in the feed stabilization tank 211. The feed pipe 4 is connected to the outside of the buffer zone, and the discharge pipe 5 is connected to the outside of the separation zone.

[0045] It should be noted that the buffer zone effectively absorbs the impact force during feeding, making the flow rate of the material more stable when entering the feed stabilization tank 211, reducing turbulence generated during material entry, and creating favorable conditions for subsequent stratification and separation processes. Through the initial stabilization of the buffer zone, the material can be distributed more evenly, thereby improving separation efficiency. The stratification zone is the key area for initial stratification of the material. After the material enters the stratification zone after stabilization in the buffer zone, due to the further reduction in flow rate and the increase in residence time, the acids and organic matter in the material can be more fully stratified. This stratification process mainly relies on gravity, and the design of the stratification zone ensures that the material has sufficient residence time in this area, thereby achieving more thorough stratification. The separation zone is the area where the material is finally separated. After the initial stratification in the stratification zone, the material enters the separation zone to further complete the separation process. The design of the separation zone ensures that the separated materials are discharged in an orderly manner along a predetermined path. Specifically, the separated light materials enter the overflow tank 212 through the baffle between the feed stabilizing tank 211 and the overflow tank 212, while the separated heavy materials are discharged directly through the heavy material discharge pipe 5 in the separation zone of the feed stabilizing tank 211. This avoids remixing between different phases, thereby improving the separation quality and ensuring the purity and quality stability of the separated materials.

[0046] In the above case, there are multiple inclined partitions 22, and the multiple inclined partitions 22 are equally spaced in the layered area along the diameter direction of the separation structure 21.

[0047] Understandably, the inclined design of the baffle 22 effectively reduces the thickness of the liquid in the separation zone. By reducing the liquid thickness, the acid and organic matter can separate into layers more quickly under gravity, improving separation efficiency and ensuring a more thorough separation process. The multiple baffles 22, evenly spaced along the diameter of the separation structure 21, ensure more uniform material flow in the separation zone, helping to reduce local turbulence and making the separation process more stable and uniform, thereby improving the separation effect.

[0048] Furthermore, the angle between the inclination direction of the inclined partition 22 and the diameter direction of the separation structure 21 is 30-45 degrees.

[0049] It should be noted that the angle between the inclined baffle 22 and the separation structure 21 in the diameter direction is 30-45 degrees, with 30° being the optimal angle. This angle range effectively reduces the thickness of the liquid between the inclined baffles 22, thereby optimizing the stratification effect. In particular, the 30° angle minimizes the liquid thickness, making it easier for acids and organic matter to separate within the stratification zone.

[0050] Furthermore, the smaller the spacing between the inclined baffles 22, the smaller the thickness of the liquid between the baffles, and the faster the stratification speed. A spacing of 40mm-50mm between the inclined baffles 22 effectively reduces the thickness of the liquid between the baffles, thereby optimizing the stratification effect. This moderate spacing ensures that the liquid has sufficient space to flow while minimizing the thickness of the liquid between the baffles, allowing acids and organic matter to stratify more quickly under gravity. However, in practical applications, there are no restrictions on the angle between the inclined baffles 22 and the separation structure 21, nor on the spacing between two adjacent inclined baffles 22; the design can be tailored to the specific circumstances.

[0051] In the above embodiment, the separation structure 21 is provided with three layers. The three layers of separation structure 21 are arranged at intervals along the height direction of the vessel body 1, and the discharge port 213 of the upper layer of separation structure 21 corresponds to the feed stabilizing channel 211 of the lower layer of separation structure 21, so that the flow path of the material is circular.

[0052] Understandably, the three-layer separation structure 21 allows the material to undergo stratification in each layer. Through multiple stratifications, acids and organic matter in the material can be separated more thoroughly. This multi-stage stratification design significantly improves separation efficiency and ensures higher purity of the separated material. The material flow path is circular, which not only extends the residence time of the material but also reduces turbulence during the flow process, increasing the chances of stratification and ensuring that the material can be fully stratified in each layer of the separation structure 21, further optimizing the stratification effect.

[0053] Based on the above embodiments, the stirrer 3 includes a stirring motor 31, a stirring shaft 32 and a stirring paddle 33. The stirring shaft 32 is used to connect the stirring motor 31 and the stirring paddle 33. The stirring motor 31 is located at the top of the vessel body 1, and the stirring paddle 33 is located near the bottom of the vessel body 1.

[0054] It should be noted that the stirring motor 31 is located at the top of the vessel body 1, and the power is transmitted to the stirring paddle 33 through the stirring shaft 32. This design ensures that the stirring paddle 33 is positioned more rationally within the vessel body 1, resulting in a more uniform stirring effect. The stirring paddle 33 is positioned close to the bottom of the vessel body 1, which can effectively stir the materials at the bottom, prevent the materials from accumulating at the bottom, and ensure that the materials in the entire vessel body 1 are mixed evenly, so as to facilitate more efficient heat dissipation of the materials.

[0055] Among them, the stirring paddle 33 adopts a three-bladed propulsion stirring paddle, which can make the material flow axially and radially simultaneously in the vessel 1, thereby improving the heat exchange efficiency.

[0056] In the above case, a tube heat exchanger 9 is also provided inside the vessel body 1, and the cooling water inlet of the tube heat exchanger 9 is located near the bottom of the vessel body 1.

[0057] Understandably, the cooling water inlet of the shell-and-tube heat exchanger 9 is located near the bottom of the vessel 1. This design ensures that the cooling water enters the heat exchanger from the bottom, allowing for sufficient heat exchange with the material inside the vessel 1 and improving heat exchange efficiency. The cooling water enters from the bottom and flows upwards, forming a counter-current flow with the material. This counter-current design maximizes heat exchange efficiency, ensuring a longer residence time of the cooling water within the heat exchanger for more thorough heat exchange with the material, thereby improving the cooling effect. The material is first separated in the separator 2 and then flows into the vessel 1 to undergo heat exchange and cooling through the shell-and-tube heat exchanger 9, ensuring that the material temperature meets the requirements of the next process step.

[0058] In this embodiment, the shell-and-tube heat exchanger 9 is integrated with an external cooling system. The cooling water inlet and outlet of the shell-and-tube heat exchanger 9 are respectively connected to an external cooling tower, which further reduces the temperature of the cooling water. The cooling water enters the shell-and-tube heat exchanger 9 from the external cooling tower, exchanges heat with the material, and then returns to the cooling tower for further cooling.

[0059] In the above embodiment, it also includes a lifter 6 and a discharge trough 7 disposed in the vessel body 1. The lifter 6 is disposed on the stirring shaft 32 and located above the stirring paddle 33. The discharge trough 7 is in clearance fit with the outer periphery of the lifter 6. The lifter 6 is used to lift the material from the stirrer 3 to the discharge trough 7. The discharge trough 7 is connected to the discharge pipe 8.

[0060] Understandably, the elevator 6 is located on the stirring shaft 32 and above the stirring paddle 33. This integrated design allows the elevator 6 to directly utilize the power of the stirrer 3, reducing the need for additional power transmission devices and improving the compactness and operating efficiency of the equipment. The elevator 6 is used to lift the cooled material to a certain height and then allow it to flow into the discharge trough 7 by gravity, effectively reducing the need for external power for lifting, increasing the space utilization of the equipment, and reducing energy consumption. The discharge trough 7 is fitted with the outer circumference of the elevator 6 with a clearance. This design allows the material to flow smoothly into the discharge trough 7 under the action of the elevator 6, reducing the resistance of the material during flow and ensuring continuous flow. After the elevator 6 lifts the material to the discharge trough 7, the material flows out through the discharge pipe 8, ensuring that the separated material is discharged quickly, reducing the residence time of the material in the stirrer 3, avoiding remixing of the material, and improving separation efficiency.

[0061] In this system, once the elevator 6 reaches a certain rotational speed, the material rises smoothly along the inner wall of the elevator 6 due to the centrifugal force of the agitator 3. This centrifugal-driven lifting method efficiently lifts the material from the agitator 3 to the discharge trough 7, ensuring continuous material flow and improving the overall operating efficiency of the device. The material is thrown into the discharge trough 7 under the centrifugal force of the elevator 6, reducing backflow during the lifting process, and then flows out through the discharge pipe 8. This rapid discharge method ensures that the separated material is quickly discharged, avoiding prolonged residence time in the agitator 3 and reducing remixing caused by excessive residence time, further improving separation efficiency.

[0062] In a preferred embodiment, the outer diameter of the discharge trough 7 is smaller than the inner diameter of the separator 2.

[0063] It should be noted that the outer diameter of the discharge trough 7 is smaller than the inner diameter of the separator 2, which ensures that there is enough space between the material and the inner wall of the separator 2 when the material flows out of the discharge trough 7, thereby reducing the resistance of the material during the flow process, ensuring smooth material flow, and improving the flow efficiency of the material.

[0064] In the above embodiment, the bottom of the vessel body 1 is provided with a drain port 10.

[0065] It should be noted that the drain port 10 at the bottom of the vessel 1 ensures that materials can be discharged from the vessel 1 efficiently and quickly during maintenance or repair. This design reduces material residue inside the vessel 1, ensuring cleanliness and safety within the vessel 1.

[0066] In summary, the nitration waste acid extraction and separation device provided by this utility model allows the mixed dinitrobenzene produced by the nitration reaction to enter the first separation structure 21 through the feed pipe 4 at the top of the vessel. The material first enters the feed stabilizing tank 211. When the material height exceeds the baffle on one side of the overflow tank 212, the material overflows into the overflow tank 212. The feed stabilizing tank 211 is equipped with inclined baffles 22 to ensure that the material is fully stratified in the tank, so that the organic matter (mixed dinitrobenzene) is in the upper layer, while water and acid and other substances are in the lower layer. The bottom of the feed stabilizing tank 211 is equipped with a waste acid drain. The waste acid after stratification is discharged through the outlet. The upper organic matter (mixed dinitrobenzene) flows into the overflow tank 212 through the baffle, and then flows into the next separation structure 21 through the outlet 213 of the overflow tank 212. The organic matter (mixed dinitrobenzene) separated by the three separation structures 21 flows into the reactor body 1. The reactor body 1 is equipped with a tube heat exchanger 9, which is used to exchange heat and cool the material in the reactor body 1. The cooled material is lifted by the elevator 6 to the discharge trough 7 at the top of the reactor body 1, and finally sent to the outside of the reactor through the discharge trough 7 for the next process.

[0067] This device achieves efficient and stable separation through the step-by-step layering of the multi-layer separation structure 21, combined with heat exchange and cooling within the vessel body 1, significantly improving the extraction and separation efficiency and quality of nitrated waste acid. Integrating the separator 2 and the agitator 3 into the same vessel body 1 effectively reduces the equipment footprint, lowers the requirements for production sites, and improves space utilization efficiency. The integrated design simplifies the equipment structure, making operation and maintenance easier.

[0068] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0069] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0070] The above provides a detailed description of the nitration waste acid extraction and separation device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A device for extracting and separating nitrated waste acid, characterized in that, include: The vessel body (1) and the separator (2) and the agitator (3) are arranged sequentially along the height direction of the vessel body (1). The separator (2) includes at least one annular separation structure (21). The separation structure (21) includes a feed stabilizing trough (211), an overflow trough (212) and a discharge port (213) arranged sequentially along the annular direction. The feed stabilizing trough (211) is provided with an inclined baffle (22) arranged in an annular shape. The inclined baffle (22) has an angle with the bottom of the feed stabilizing trough (211).

2. The nitration waste acid extraction and separation device according to claim 1, characterized in that, The feed stabilizing tank (211) is provided with a buffer zone, a stratification zone and a separation zone in sequence. The buffer zone is connected to the feed pipe (4) and the separation zone is connected to the discharge pipe (5).

3. The nitration waste acid extraction and separation device according to claim 2, characterized in that, The inclined partition (22) is provided in multiple ways, and the multiple inclined partitions (22) are equally spaced in the layered area along the diameter direction of the separation structure (21).

4. The nitration waste acid extraction and separation device according to claim 3, characterized in that, The angle between the inclination direction of the inclined partition (22) and the diameter direction of the separation structure (21) is 30-45 degrees.

5. The nitration waste acid extraction and separation device according to claim 1, characterized in that, The separation structure (21) has three layers. The three layers of separation structure (21) are spaced apart along the height direction of the vessel body (1), and the discharge port (213) of the upper layer of separation structure (21) corresponds to the feed stabilizing trough (211) of the lower layer of separation structure (21) so that the flow path of the material is circular.

6. The nitration waste acid extraction and separation device according to claim 1, characterized in that, The stirrer (3) includes a stirring motor (31), a stirring shaft (32) and a stirring paddle (33). The stirring shaft (32) is used to connect the stirring motor (31) and the stirring paddle (33). The stirring motor (31) is located at the top of the vessel body (1), and the stirring paddle (33) is located near the bottom of the vessel body (1).

7. The nitration waste acid extraction and separation device according to claim 6, characterized in that, It also includes a lifter (6) and a discharge trough (7) disposed in the vessel body (1). The lifter (6) is disposed on the stirring shaft (32) and located above the stirring paddle (33). The discharge trough (7) is in clearance fit with the outer periphery of the lifter (6). The lifter (6) is used to lift the material from the stirrer (3) to the discharge trough (7). The discharge trough (7) is connected to the discharge pipe (8).

8. The nitration waste acid extraction and separation device according to claim 7, characterized in that, The outer diameter of the discharge trough (7) is smaller than the inner diameter of the separator (2).

9. The nitration waste acid extraction and separation device according to claim 1, characterized in that, It also includes a tube heat exchanger (9) disposed inside the vessel body (1), with the cooling water inlet of the tube heat exchanger (9) located near the bottom of the vessel body (1).

10. The nitration waste acid extraction and separation device according to claim 1, characterized in that, The bottom of the vessel body (1) is provided with a drain port (10).

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