A tower for the extraction separation of dinitrophenol in nitration reactions

Abstract

The application discloses a mixed dinitrobenzene extraction separation tower for a nitration reaction, which comprises an extraction tower body, a heavy liquid inlet and a light liquid inlet are arranged on one side of the extraction tower body near top and bottom ends respectively, a light liquid outlet is arranged on the top of the extraction tower body, and a heavy liquid outlet is arranged on the bottom of the extraction tower body; a plurality of blocking discs are arranged in the extraction tower body at equal intervals, and the blocking discs are provided with liquid passing holes. The application realizes the periodic pulse opening and closing of a fluid channel through the plurality of blocking discs arranged in the tower at equal intervals and the stirring blocking mechanism matched with the blocking discs. After vertical bars are inserted into the liquid passing holes and are lifted, the recesses on the vertical bars form a periodically changed gap, so that instantaneous impact turbulent flow of the fluid is generated, the laminar flow boundary of two-phase fluid is effectively broken, the contact and mixing between the heavy liquid and the light liquid are greatly enhanced, the mass transfer resistance is reduced, and therefore the extraction efficiency of mixed dinitrobenzene is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of extraction separation tower technology, and in particular to an extraction separation tower for mixed dinitrobenzene in nitration reactions. Background Technology

[0002] In the production of phenylenediamine and similar fine chemicals, the preparation of mixed dinitrobenzenes typically involves multi-stage nitration reactions. In existing processes, the dilute acid (e.g., 72% sulfuric acid) produced in the first-stage nitration is mixed with the products from the second-stage nitration to produce sulfuric acid of a higher concentration (e.g., 88%). This concentration of sulfuric acid exhibits high solubility (over 20%) for the target product, mixed dinitrobenzenes, leading to a series of challenging problems:

[0003] 1. Poor separation effect: In the subsequent nitration separator, a large amount of mixed dinitrobenzene dissolved in the sulfuric acid phase could not be effectively separated, resulting in a loss of target product yield.

[0004] 2. System Operation Risks: The dinitro organic compounds carried in the separated concentrated sulfuric acid are highly susceptible to crystallization and precipitation during pipeline transportation and subsequent processing due to temperature changes, causing severe blockages in pipelines and equipment. This not only increases maintenance costs and the risk of production downtime but also poses potential safety hazards.

[0005] 3. Resource and energy consumption issues: Sulfuric acid containing a large amount of organic matter is difficult to reuse or treat directly, increasing the cost of waste acid treatment. At the same time, additional concentration or blending processes are required to adjust the acid concentration, increasing energy and material consumption.

[0006] To address these issues, the industry typically considers introducing an extraction unit, utilizing a solvent with high selectivity for mixed dinitrobenzenes and immiscibility with sulfuric acid to extract the mixed dinitrobenzenes from the sulfuric acid. However, traditional extraction towers (such as sieve tray towers and packed towers) often suffer from insufficient efficiency, clogging, or the need for additional complex pulse generators and stirring systems when dealing with such high-viscosity, easily clogged systems requiring high mass transfer efficiency.

[0007] Therefore, there is an urgent need to develop an extraction and separation device specifically designed for this particular system, capable of enhancing mass transfer, preventing clogging, and possessing a highly efficient and compact structure. This invention aims to meet this pressing production technology requirement by achieving efficient recovery of mixed dinitrobenzene and purification and recycling of the sulfuric acid medium through innovative tower internals design, fundamentally optimizing existing nitration production processes. Summary of the Invention

[0008] To address the problems mentioned in the background section, the present invention provides an extraction and separation tower for mixed dinitrobenzene in nitration reactions.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An extraction and separation tower for mixed dinitrobenzene in a nitration reaction includes an extraction tower body, wherein a heavy liquid inlet and a light liquid inlet are respectively provided on one side of the extraction tower body near the top and bottom, a light liquid outlet is provided at the top of the extraction tower body, and a heavy liquid outlet is provided at the bottom of the extraction tower body.

[0011] The extraction tower body is provided with multiple baffles at equal intervals inside the tower body, and the baffles are provided with liquid passage holes.

[0012] The extraction tower body is equipped with a drive vertical shaft inside, and a stirring and blocking mechanism is provided above each blocking plate on the outside of the drive vertical shaft.

[0013] The stirring blocking mechanism includes a connecting bracket. Vertical bars are evenly distributed at the bottom of the stirring blocking mechanism. Each vertical bar corresponds to a liquid passage hole. Multiple grooves are evenly distributed on both sides of the vertical bars from top to bottom.

[0014] The top of the drive shaft extends into the drive box at the top of the extraction tower. The drive box can drive the drive shaft to move up and down, and it can rotate after moving to the highest point.

[0015] Preferably, a liquid distributor is provided at one end of the heavy liquid inlet and the light liquid inlet inside the extraction tower body, and the liquid distributor includes a separating bend.

[0016] Preferably, the liquid distribution bend is bent into a ring shape, and multiple liquid distribution pipes are distributed in a ring on the liquid distribution bend. The liquid distribution pipe on the liquid distribution bend connected to the heavy liquid inlet has its opening facing upward, and the liquid distribution pipe on the liquid distribution bend connected to the light liquid inlet has its opening facing downward.

[0017] Preferably, a drive pulley is rotatably installed inside the drive box, a limit guide post is fixed to the top of the drive vertical shaft, a lifting bracket is fixed to the top of the limit guide post, and an arc-shaped limit guide frame is fixed to the side of the lifting bracket near the drive pulley.

[0018] Preferably, a connecting rod is fixed to the side of the active pulley near the arc-shaped limiting guide frame, and a limiting rod is fixed on the connecting rod, with the limiting rod extending into the arc-shaped sliding groove on the arc-shaped limiting guide frame.

[0019] Preferably, a vertical guide rail is fixed on the inner wall of the drive box, and the lifting bracket is slidably mounted on the lifting bracket.

[0020] Preferably, a rotary motor is fixed on the outside of the drive box, the rotary motor is equipped with a motor reducer, the output shaft of the rotary motor is connected to the input end of the motor reducer, and the output end of the motor reducer is connected to the drive pulley.

[0021] Preferably, a vertically arranged transmission sleeve is rotatably installed inside the drive box, and a limiting guide post moves through the transmission sleeve. Limiting protrusions are provided on both sides of the limiting guide post to ensure that the limiting guide post can only slide up and down relative to the transmission sleeve.

[0022] Preferably, the transmission sleeve has a helical guide groove on its outside, and both the top and bottom ends of the transmission sleeve are provided with limiting rings. The limiting rings have limiting grooves. A driven pulley is also rotatably installed in the drive box. A connecting shaft is fixed on the driven pulley. Two levers and two arc-shaped limiting strips are fixed on the connecting shaft. The levers and arc-shaped limiting strips are staggered, and the levers and limiting grooves are matched accordingly. The arc-shaped limiting strips and limiting grooves are matched accordingly.

[0023] Preferably, the driven pulley and the driving pulley are driven by a belt, and the diameter of the driven pulley is twice the diameter of the driving pulley. The arc-shaped limiting guide frame has a semi-circular structure.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. By using multiple baffles evenly distributed within the tower and a precisely matched stirring and baffle mechanism, the periodic pulse opening and closing of the fluid channel is achieved. The vertical bars, inserted into the liquid passage holes, rise and fall, using their grooves to create periodically changing gaps, generating instantaneous impact turbulence in the fluid. This effectively breaks the laminar boundary between the two phases, greatly enhancing the contact and mixing between the heavy and light liquids, reducing mass transfer resistance, and thus significantly improving the extraction efficiency of mixed dinitrobenzene.

[0026] 2. Driven by the vertical shaft, the stirring and blocking mechanism can not only rise and fall, but also rotate 180 degrees at specific positions. During rotation, the vertical bars and grooves strongly stir the liquid inside the tower, continuously agitating and rapidly updating the two-phase mass transfer interface, preventing local equilibrium, and promoting the continuous and efficient diffusion of mixed dinitrobenzene from the sulfuric acid phase to the mononitrobenzene phase, thus ensuring the stability and efficiency of the extraction process.

[0027] 3. The entire tower integrates multiple functions such as pulse generation, stirring, and liquid distribution. Driven by only one rotary motor, it can automatically and continuously control the vertical shaft to complete the cycle of rising, rotating at the top, and reciprocating lifting and lowering. It has a high degree of automation, a reasonable and compact mechanical structure, and reliable operation.

[0028] 4. The application of this tower enables the efficient recovery of mixed dinitrobenzene from 82% sulfuric acid. The recovered material can be directly used as a nitration feedstock, achieving resource recycling. Simultaneously, it reduces the generation of high-concentration sulfuric acid, lowering the load and energy consumption of subsequent vacuum concentration processes. Furthermore, it avoids blockage problems caused by the precipitation of dinitro compounds in pipelines, improving production safety and continuity, and comprehensively reducing production costs. It possesses high application value and economic prospects. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a perspective view of the extraction tower of the present invention;

[0031] Figure 2 This is a front view of the extraction tower of the present invention;

[0032] Figure 3 This is a front-view sectional view of the extraction tower of the present invention;

[0033] Figure 4 This is a schematic diagram showing the cooperation relationship between the stirring blocking mechanism and the blocking disk of the present invention;

[0034] Figure 5 This is a schematic diagram of the liquid distributor structure of the present invention;

[0035] Figure 6 This is a first-view perspective perspective view of the internal transmission structure of the drive box of the present invention;

[0036] Figure 7 This is a front view of the internal transmission structure of the drive box of the present invention;

[0037] Figure 8 This is a second-view perspective perspective view of the internal transmission structure of the drive box of the present invention;

[0038] Figure 9 This is a third-view perspective view of the internal transmission structure of the drive box of the present invention;

[0039] Figure 10 This is a schematic diagram showing the relative engagement relationship between the arc-shaped limiting guide frame and the drive pulley of the present invention;

[0040] In the diagram: 1. Extraction column body; 101. Heavy liquid inlet; 102. Light liquid inlet; 103. Light liquid outlet; 104. Heavy liquid outlet; 105. Separating bend; 1051. Liquid distribution pipe; 106. Baffle plate; 1061. Liquid passage hole; 107. Drive vertical shaft; 1071. Connecting bracket; 1072. Vertical bar; 1073. Groove; 108. Limiting guide post; 1081. Limiting protrusion; 109. Lifting bracket; 1091 1. Vertical guide rail; 110. Arc-shaped limit guide frame; 111. Arc-shaped slide groove; 2. Drive box; 201. Rotary motor; 2011. Motor reducer; 202. Connecting shaft; 2021. Driven pulley; 2022. Lever; 2023. Arc-shaped limit bar; 203. Drive pulley; 204. Connecting rod; 2041. Limiting bar; 3. Transmission sleeve; 301. Helical guide groove; 302. Limiting retaining ring; 303. Limiting groove. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] Reference Figure 1-10 An extraction and separation tower for mixed dinitrobenzene in a nitration reaction includes an extraction tower body 1, with a heavy liquid inlet 101 and a light liquid inlet 102 located near the top and bottom of the extraction tower body 1, respectively. A light liquid outlet 103 is located at the top of the extraction tower body 1, and a heavy liquid outlet 104 is located at the bottom of the extraction tower body 1.

[0044] The interior of the extraction column body 1 is provided with multiple baffles 106 at equal intervals, and the baffles 106 are distributed with liquid passage holes 1061.

[0045] The extraction tower body 1 is equipped with a drive vertical shaft 107 inside, and a stirring blocking mechanism is provided on the outside of the drive vertical shaft 107 above each blocking plate 106.

[0046] The stirring blocking mechanism includes a connecting bracket 1071. Vertical bars 1072 are evenly distributed at the bottom of the stirring blocking mechanism. The vertical bars 1072 correspond one-to-one with the liquid passage holes 1061. Multiple grooves 1073 are evenly distributed on both sides of the vertical bars 1072 from top to bottom.

[0047] The top of the drive vertical shaft 107 extends into the drive box 2 at the top of the extraction tower body 1. The drive box 2 can drive the drive vertical shaft 107 to move up and down, and can rotate after moving to the highest point.

[0048] The 72% acid separated from the first-stage nitration reaction is mixed with the nitrate containing 88% sulfuric acid from the second-stage reaction in a certain proportion and then fed into a nitrate heat exchanger for cooling. The cooled 88% sulfuric acid is diluted to 82% sulfuric acid and fed into a nitration separator together with the nitrate. The separated 82% sulfuric acid contains about 10% mixed dinitrobenzene. The mononitrobenzene produced in the first-stage reaction is used to extract the mixed dinitrobenzene from the 82% sulfuric acid. The mononitrobenzene and mixed dinitrobenzene after extraction are used as raw materials for the second-stage nitration. If the mixed dinitrobenzene does not react under the condition that the dehydration value in the second stage is constant, it will remain mixed dinitrobenzene. According to the dinitration reaction capacity and speed, the production capacity will not decrease. Moreover, the amount of 82% sulfuric acid increases and the amount of 72% sulfuric acid decreases, the vacuum concentration load decreases, consumption decreases, and costs decrease.

[0049] 82% sulfuric acid containing 10% mixed dinitrobenzene is introduced into the body of the extraction tower 1 through the heavy liquid inlet 101, and mononitrobenzene produced by a first-stage reaction is introduced into the body of the extraction tower 1 through the light liquid inlet 102. The two form a convection flow, thereby extracting the mixed dinitrobenzene. The mixed dinitrobenzene flows out from the light liquid outlet 103, and the sulfuric acid flows out from the heavy liquid outlet 104.

[0050] During the flow process, the liquid needs to continuously pass through the liquid passage holes 1061 on the baffle plate 106, which can achieve the effect of multiple uniform fluid distribution, eliminate radial flow deviation, break up droplets, expand the contact area between the two phases, and ensure stable and efficient extraction. When the driving vertical shaft 107 moves downward, the vertical bar 1072 is inserted into the liquid passage hole 1061 and moves downward. The maximum cross-section of the vertical bar 1072 matches the liquid passage hole 1061, which can block the liquid passage hole 1061. When it moves to the position where the groove 1073 corresponds to the liquid passage hole 1061, a gap is formed, allowing the liquid to pass through. During the movement, the liquid passage hole 1061 will be continuously blocked and opened, blocked again, and opened again, achieving the purpose of pulse opening and closing, forming a pulsed fluid channel. Under the action of pressure difference, the fluid quickly passes through the gap, generating instantaneous impact turbulence, breaking the laminar boundary of the two-phase fluid, making the contact between the heavy liquid and the light liquid more intense, and reducing mass transfer resistance.

[0051] After the vertical bar 1072 moves to the lowest position, it rises back up and then moves to the highest position (at which point the vertical bar 1072 separates from the liquid passage 1061), driving the vertical shaft 107 to rotate 180 degrees. Multiple vertical bars 1072 can follow the movement, which can efficiently stir the liquid. The presence of the groove 1073 makes multiple stirring branches on the vertical bar 1072, which can further improve the stirring effect. The stirring branches continuously disturb the two-phase interface, quickly destroy the old interface that has reached mass transfer equilibrium, and promote the continuous formation of new interfaces, which significantly improves the diffusion efficiency of mixed dinitrobenzene.

[0052] After rotating 180 degrees, one movement is completed. Then, move downwards again to begin the next cycle.

[0053] The heavy liquid inlet 101 and the light liquid inlet 102 are provided with a liquid distributor at one end inside the extraction tower body 1. The liquid distributor includes a liquid distribution bend 105, which is bent into a ring shape. Multiple liquid outlet distribution pipes 1051 are distributed in a ring on the liquid distribution bend 105. The liquid outlet distribution pipes 1051 on the liquid distribution bend 105 connected to the heavy liquid inlet 101 have their openings facing upwards, while the liquid outlet distribution pipes 1051 on the liquid distribution bend 105 connected to the light liquid inlet 102 have their openings facing downwards.

[0054] The separator bend 105 is bent into a ring shape and arranged coaxially with the extraction tower body 1. This can transform the feeding of heavy liquid and light liquid from a single point to a ring-shaped circumferential feeding, avoiding the fluid from being concentrated only in the center of the tower or a local area, and improving the dispersion.

[0055] Example 2

[0056] Reference Figure 1-10 The difference between this embodiment and embodiment 1 is that an active pulley 203 is rotatably installed inside the drive box 2, a limit guide post 108 is fixed at the top of the drive vertical shaft 107, a lifting bracket 109 is fixed at the top of the limit guide post 108, an arc-shaped limit guide frame 110 is fixed on the side of the lifting bracket 109 near the active pulley 203, a connecting rod 204 is fixed on the side of the active pulley 203 near the arc-shaped limit guide frame 110, a limit rod 2041 is fixed on the connecting rod 204, and the limit rod 2041 extends into the arc-shaped groove 111 on the arc-shaped limit guide frame 110;

[0057] When the drive pulley 203 rotates, it can drive the connecting rod 204 to rotate as well. When the connecting rod 204 rotates to the upper part of the drive pulley 203, due to the arc-shaped limit guide 110 driven by the arc design, the arc-shaped limit guide 110 is a semi-circular structure. At this time, as the connecting rod 204 rotates, the limit bar 2041 can move along the arc-shaped slide groove 111 without pushing the lifting bracket 109 to move up and down.

[0058] When the connecting rod 204 rotates to the lower half of the drive pulley 203, the position bar 2041 can move along the arc-shaped slide groove 111 and push the arc-shaped limit guide frame 110 downward. The vertical guide rail 1091 is fixed on the inner wall of the drive box 2. The lifting bracket 109 is slidably installed on the lifting bracket 109 to ensure that the lifting bracket 109 rises and falls smoothly. When it reaches the lowest position, it continues to rotate, can move upward to reset, and continue to stay at the highest position for a period of time.

[0059] The continuous rotation of the drive pulley 203 can drive the drive shaft 107 to move up and down continuously, and it can stay at the highest position for a period of time.

[0060] To drive the drive pulley 203 to rotate, a rotary motor 201 is fixed on the outside of the drive box 2. The rotary motor 201 is equipped with a motor reducer 2011. The output shaft of the rotary motor 201 is connected to the input end of the motor reducer 2011, and the output end of the motor reducer 2011 is connected to the drive pulley 203. The motor reducer 2011 reduces the speed of the rotary motor 201, thereby driving the drive pulley 203 to rotate at a slower speed and increasing the output torque.

[0061] Example 3

[0062] Reference Figure 1-10 The difference between this embodiment and embodiment 2 is that a vertically arranged transmission sleeve 3 is rotatably installed inside the drive box 2, and a limiting guide post 108 movably passes through the transmission sleeve 3. Limiting protrusions 1081 are provided on both sides of the limiting guide post 108 to ensure that the limiting guide post 108 can only slide up and down relative to the transmission sleeve 3.

[0063] The transmission sleeve 3 has a spiral guide groove 301 on its outside. The top and bottom ends of the transmission sleeve 3 are provided with limiting rings 302. The limiting rings 302 have limiting grooves 303. A driven pulley 2021 is rotatably installed in the drive box 2. A connecting shaft 202 is fixed on the driven pulley 2021. Two levers 2022 and two arc-shaped limiting strips 2023 are fixed on the connecting shaft 202. The levers 2022 and the arc-shaped limiting strips 2023 are staggered, and the levers 2022 and the limiting grooves 303 are matched accordingly. The arc-shaped limiting strips 2023 and the limiting grooves 303 are matched accordingly.

[0064] Driven pulley 2021 and driven pulley 203 are connected by a belt drive, and the diameter of driven pulley 2021 is twice the diameter of driven pulley 203. When driven pulley 203 rotates, driven pulley 2021 can rotate synchronously with it, and their linear velocities are the same. The rotational angular velocity of driven pulley 2021 is half that of driven pulley 203. When connecting rod 204 rotates to the upper part of driven pulley 203, the drive shaft 107 moves to its highest point, and lever 2022 is precisely engaged from below into the helical guide groove 301 of transmission sleeve 3. Figure 7 As shown, during the process of the active pulley 203 continuing to rotate 180 degrees, the height of the drive vertical shaft 107 remains unchanged, and the lever 2022 moves along the helical guide groove 301, which can drive the transmission sleeve 3 to rotate 180 degrees, thereby driving the drive vertical shaft 107 to rotate 180 degrees. During this process, the driven pulley 2021 rotates 90 degrees, causing the lever 2022 to separate from the helical guide groove 301. The active pulley 203 continues to rotate 180 degrees, which will drive the drive vertical shaft 107 to move down one round trip. During this process, the arc-shaped limiting strip 2023 connected to the driven pulley 2021 will be stuck in the limiting groove 303, ensuring that the transmission sleeve 3 and the drive vertical shaft 107 will not rotate, thereby ensuring that the vertical strip 1072 is accurately aligned with the liquid passage hole 1061.

[0065] Simply inputting power to drive the drive pulley 203 to rotate continuously can achieve the effect of driving the drive shaft 107 to move up and down continuously, and be able to stay at the highest position for a period of time.

[0066] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dinitrobenzene extraction and separation tower for use in nitration reactions, comprising an extraction tower body (1), characterized in that: The extraction tower body (1) has a heavy liquid inlet (101) and a light liquid inlet (102) on one side near the top and bottom, respectively. The extraction tower body (1) has a light liquid outlet (103) at the top and a heavy liquid outlet (104) at the bottom. The extraction tower body (1) is provided with multiple baffles (106) at equal intervals inside, and the baffles (106) are provided with liquid passage holes (1061). The extraction tower body (1) is equipped with a drive vertical shaft (107) inside, and a stirring blocking mechanism is provided on the outside of the drive vertical shaft (107) above each blocking plate (106). The stirring blocking mechanism includes a connecting bracket (1071), and vertical strips (1072) are evenly distributed at the bottom end of the stirring blocking mechanism. The vertical strips (1072) correspond one-to-one with the liquid passage holes (1061). Multiple grooves (1073) are evenly distributed on both sides of the vertical strips (1072) from top to bottom. The top of the drive shaft (107) extends into the drive box (2) at the top of the extraction tower body (1). The drive box (2) can drive the drive shaft (107) to move up and down, and can rotate after moving to the highest point.

2. The extraction and separation tower for mixed dinitrobenzene in a nitration reaction according to claim 1, characterized in that: The heavy liquid inlet (101) and light liquid inlet (102) are provided with a liquid distributor at one end inside the extraction tower body (1), and the liquid distributor includes a liquid distribution bend (105).

3. The extraction and separation tower for mixed dinitrobenzene in a nitration reaction according to claim 2, characterized in that: The liquid distribution bend (105) is bent into a ring shape, and multiple liquid distribution pipes (1051) are distributed in a ring on the liquid distribution bend (105). The liquid distribution pipes (1051) on the liquid distribution bend (105) connected to the heavy liquid inlet (101) have their openings facing upwards, while the liquid distribution pipes (1051) on the liquid distribution bend (105) connected to the light liquid inlet (102) have their openings facing downwards.

4. The extraction and separation tower for mixed dinitrobenzene in a nitration reaction according to claim 1, characterized in that: The drive box (2) is rotatably installed with a drive pulley (203), and a limit guide post (108) is fixed at the top of the drive vertical shaft (107). A lifting bracket (109) is fixed at the top of the limit guide post (108), and an arc-shaped limit guide frame (110) is fixed on the side of the lifting bracket (109) near the drive pulley (203).

5. The extraction and separation tower for mixed dinitrobenzene in a nitration reaction according to claim 4, characterized in that: The active pulley (203) is fixed with a connecting rod (204) on the side near the arc-shaped limiting guide frame (110). A limiting rod (2041) is fixed on the connecting rod (204), and the limiting rod (2041) extends into the arc-shaped slide groove (111) on the arc-shaped limiting guide frame (110).

6. The extraction and separation tower for mixed dinitrobenzene in a nitration reaction according to claim 5, characterized in that: A vertical guide rail (1091) is fixed on the inner wall of the drive box (2), and the lifting bracket (109) is slidably installed on the lifting bracket (109).

7. The extraction and separation tower for mixed dinitrobenzene in a nitration reaction according to claim 6, characterized in that: A rotary motor (201) is fixed on the outside of the drive box (2). The rotary motor (201) is equipped with a motor reducer (2011). The output shaft of the rotary motor (201) is connected to the input end of the motor reducer (2011), and the output end of the motor reducer (2011) is connected to the drive pulley (203).

8. The extraction and separation tower for mixed dinitrobenzene in a nitration reaction according to claim 5, characterized in that: The drive box (2) is rotatably mounted with a vertically arranged transmission sleeve (3). The limiting guide post (108) moves through the transmission sleeve (3). Limiting protrusions (1081) are provided on both sides of the limiting guide post (108) to ensure that the limiting guide post (108) can only slide up and down relative to the transmission sleeve (3).

9. A dinitrobenzene extraction and separation tower for nitration reactions according to claim 8, characterized in that: The transmission sleeve (3) has a spiral guide groove (301) on its outside. The top and bottom ends of the transmission sleeve (3) are provided with a limiting ring (302). The limiting ring (302) has a limiting groove (303). The driven pulley (2021) is also rotatably installed in the drive box (2). The driven pulley (2021) is fixed with a connecting shaft (202). The connecting shaft (202) is fixed with two levers (2022) and two arc-shaped limiting strips (2023). The levers (2022) and the arc-shaped limiting strips (2023) are staggered, and the levers (2022) and the limiting grooves (303) are matched accordingly. The arc-shaped limiting strips (2023) and the limiting grooves (303) are matched accordingly.

10. A dinitrobenzene extraction and separation tower for nitration reactions according to claim 9, characterized in that: The driven pulley (2021) and the driving pulley (203) are driven by a belt, and the diameter of the driven pulley (2021) is twice the diameter of the driving pulley (203). The arc-shaped limiting guide frame (110) has a semi-circular structure.

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