Extraction tower for synthesizing mixed dinitrobenzene

Abstract

The extraction tower comprises an extraction tower body, a light liquid outlet is formed in the top end of the extraction tower body, a heavy liquid outlet is formed in the bottom end of the extraction tower body, and a heavy liquid inlet and a light liquid inlet are formed in the positions, close to the top end and the bottom end, of one side of the extraction tower body respectively. Distribution mixing mechanisms are mounted at positions, corresponding to the heavy liquid inlet and the light liquid inlet, in the extraction tower body, a plurality of fixing plates and rotating discs are arranged in the extraction tower body from top to bottom in a staggered manner, and the fixing plates are of annular structures and are fixed to the inner wall of the extraction tower body. Through the distribution mixing mechanism, fluid distribution is optimized, liquid is uniformly dispersed through the distribution header pipe and the branch pipes, the mixing effect is enhanced through the circular baffle and the collector, and the mass transfer efficiency is improved; the rotating disc and the stirring blades are driven by the rotating motor to enable liquid to form turbulent flow, the contact area is increased, the space is divided by the fixing plate, axial reverse mixing is reduced, and mixing mass transfer is further enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of mixed dinitrobenzene synthesis, in particular to an extraction tower for mixed dinitrobenzene synthesis. Background Art

[0002] In the synthesis process of mixed dinitrobenzene, extraction is a key link that has a vital impact on product quality and production efficiency. Traditional extraction towers expose many problems when handling the liquid-liquid extraction process related to the synthesis of mixed dinitrobenzene.

[0003] From the perspective of fluid distribution, conventional distribution methods make it difficult to achieve uniform dispersion of heavy liquid and light liquid in the tower. Some traditional extraction towers only use simple pipeline feeding, which leads to excessive or low concentration of fluid in local areas of the tower, and cannot fully contact, seriously affecting the extraction efficiency. For example, in the synthesis of mixed dinitrobenzene, if the heavy liquid and light liquid cannot be evenly distributed, the contact between the two will be insufficient, part of the raw materials will be wasted, and the purity of the product will be reduced.

[0004] In terms of mixed mass transfer, the stirring structure and internal component design of ordinary extraction towers are relatively simple. Common stirring devices can only promote fluid mixing in a limited area, and it is difficult to form effective turbulence, resulting in poor interphase mass transfer. The problem is more prominent when faced with fluid systems with high viscosity and high density differences. For the complex fluids involved in the synthesis of mixed dinitrobenzene, this single stirring method cannot fully mix the substances in different phases, which limits the mass transfer rate and thus affects the efficiency and quality of the entire synthesis process.

[0005] In summary, the existing extraction tower has many defects in the mixed dinitrobenzene synthesis process, and a new extraction tower that can optimize fluid distribution and enhance mixed mass transfer effect is urgently needed to meet the growing production needs and improve production efficiency and product quality. Summary of the invention

[0006] In order to solve the problems mentioned in the above background technology, the present invention provides an extraction tower for synthesizing mixed dinitrobenzene.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: An extraction tower for synthesizing mixed dinitrobenzene comprises an extraction tower body, wherein the top of the extraction tower body is provided with a light liquid outlet, the bottom of the extraction tower body is provided with a heavy liquid outlet, one side of the extraction tower body is provided with a heavy liquid inlet and a light liquid inlet near the top and near the bottom, respectively, a distribution mixing mechanism is installed at positions corresponding to the heavy liquid inlet and the light liquid inlet inside the extraction tower body, and a plurality of fixed plates and turntables are staggered from top to bottom inside the extraction tower body, the fixed plates are annular in structure and are fixed to the inner wall of the extraction tower body, and the turntable is driven to rotate by a rotating motor arranged at the top of the extraction tower body.

[0008] Preferably, a first rotating shaft and a second rotating shaft are respectively installed near the top and bottom ends of the extraction tower body, a commutator is installed on the fixed plate, the installation shafts of the turntables are connected through the commutator, and the bottom end of the first rotating shaft is connected to the top commutator, and the top end of the second rotating shaft is connected to the bottom commutator. The transmission of the commutator ensures that the rotation directions of adjacent turntables are different.

[0009] Preferably, a first bevel gear is rotatably mounted on the inner side wall of the commutator, a second bevel gear is fixed to one end of the mounting shaft, the first shaft and the second shaft extending to the inside of the commutator, and the first bevel gear is meshed with two second bevel gears on its upper and lower sides.

[0010] Preferably, a plurality of stirring blades are fixed to the top of the turntable, and the stirring blades are distributed in a circular array at the top of the turntable.

[0011] Preferably, the distribution mixing mechanism includes a distribution main pipe and a circular baffle, a plurality of distribution branch pipes are symmetrically distributed on both sides of the distribution main pipe, and a plurality of rectangular liquid passage openings are opened on the circular baffle, and the rectangular liquid passage openings correspond to the positions of the distribution branch pipes.

[0012] Preferably, a plurality of liquid outlet holes are provided on a side of the distribution branch pipe close to the circular baffle, and a concentrator is installed on a side of the circular baffle close to the distribution branch pipe.

[0013] Preferably, a horizontal axis is rotatably installed inside the distribution main pipe, and a plurality of semi-circular arc blocking plates are fixed outside the horizontal axis. The semi-circular arc blocking plates are used to block the distribution branch pipes, and the semi-circular arc blocking plates are horizontally staggered.

[0014] Preferably, a third bevel gear is fixed on the horizontal axis, the first rotating shaft and the second rotating shaft pass through the distribution main pipe, and a fourth bevel gear is fixed on the first rotating shaft and the second rotating shaft at an inner position of the distribution main pipe, and the third bevel gear is meshed with the fourth bevel gear.

[0015] Preferably, a driving box, an inner lifting ring and an outer lifting ring are provided on the side of the circular baffle away from the distribution main pipe, a plurality of strip sealing plates are fixed to the bottom ends of the inner lifting ring and the outer lifting ring, the outer lifting ring is connected to the inner wall of the extraction tower body through a vertical guide rail, the inner lifting ring is connected to the output end of the driving box, the first rack and the second rack are fixed at corresponding positions on the outer lifting ring and the inner lifting ring, a spur gear is rotatably installed on the circular baffle between the first rack and the second rack, and the first rack and the second rack are both meshed with the spur gear.

[0016] Preferably, a connecting frame is fixed on the inner lifting ring, the connecting frame extends to the interior of the drive box through a vertical guide opening on the drive box and is fixed with a threaded sleeve, the threaded sleeve is installed on the outside of the first rotating shaft and the second rotating shaft, and the outside of the first rotating shaft and the second rotating shaft is provided with a reciprocating thread.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Optimize fluid distribution: The present invention creatively sets up a distribution and mixing mechanism to solve the problem of uneven fluid distribution in traditional extraction towers. The heavy liquid and light liquid can be evenly dispersed through the ingenious design of the distribution main pipe and distribution branch pipes. Through the combination of the circular baffle and the concentrator, the rectangular liquid port on the circular baffle guides the liquid flow, and the concentrator gathers and pressurizes the liquid. The two work together to enable liquids of different phases to mix more fully when they meet, thereby enhancing the mixing effect and improving the mass transfer efficiency.

[0018] 2. Enhance the mixing and mass transfer effect: Through the cooperation of the turntable and the stirring blades, driven by the rotating motor, the turntable rotates at high speed, and the stirring blades stir the liquid, so that the liquid forms a strong turbulence in the tower. This turbulent state greatly increases the contact area of ​​the two-phase liquid, allowing the transfer of solutes between different phases to be faster, and improving the mass transfer efficiency. At the same time, the fixed plate divides the space in the tower into multiple relatively independent chambers, effectively blocking the direct flow of the liquid in the axial direction, reducing the possibility of axial back mixing, allowing the liquid to be fully mixed in the chamber, and further optimizing the overall mixing effect.

[0019] 3. Pulse liquid injection: The present invention realizes the alternating opening and closing of the distribution branch pipes through the cooperation of the semicircular arc blocking plate and the horizontal axis, forming a pulse liquid injection mode. When the first rotating shaft and the second rotating shaft rotate, the third bevel gear and the fourth bevel gear are engaged to drive the horizontal axis to rotate, changing the position of the semicircular arc blocking plate, so that only half of the distribution branch pipes are opened at the same time. This pulse injection increases the pressure of the liquid when it is sprayed, allowing the liquid to enter the tower in a stronger manner to participate in mixing, further improving the mixing effect and extraction efficiency.

[0020] 4. Automated blocking control: Through the cooperation of the strip blocking plate with the inner lifting ring and the outer lifting ring, when the first rotating shaft and the second rotating shaft rotate, the cooperation of the reciprocating thread and the threaded sleeve drives the inner lifting ring to move up and down, and then through the meshing of the first rack, the second rack and the spur gear, the outer lifting ring moves in the opposite direction synchronously, thereby driving the strip blocking plate to automatically control the opening and closing of the rectangular liquid port. In addition, its opening and closing frequency is consistent with the distribution branch pipe, ensuring that when the distribution branch pipe is opened, the corresponding rectangular liquid port is also opened, and vice versa. This precise automated control further enhances the impact effect of the liquid, makes the liquid mixed more fully, and significantly improves the mixing degree and extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A perspective view of the present invention; Figure 2 It is a cross-sectional view from the main perspective of the present invention; Figure 3 is a three-dimensional cross-sectional view of the present invention; Figure 4 It is a schematic diagram of the relative position relationship between the distribution main pipe and the circular baffle of the present invention from a first viewing angle; Figure 5 A schematic diagram showing the relative position relationship between the distribution main pipe and the circular baffle of the present invention from a second viewing angle; Figure 6 It is a schematic diagram of the circular baffle structure of the present invention; Figure 7 It is a schematic diagram of the distribution of the semicircular arc plugging plate of the present invention on the semicircular arc plugging plate; Figure 8 It is a cross-sectional view of the drive box of the present invention; Fig. 9 It is a schematic diagram of the arrangement of the fixed plate and the rotating disk of the present invention; Fig.10 is a cross-sectional view of a commutator of the present invention; Fig.11 It is a cross-sectional view of the distribution main pipe of the present invention; In the figure: 1, extraction tower body; 101, heavy liquid inlet; 102, light liquid inlet; 103, heavy liquid outlet; 104, light liquid outlet; 2, fixed plate; 201, commutator; 202, first bevel gear; 3, turntable; 301, stirring blade; 4, distribution and mixing mechanism; 401, distribution main pipe; 402, distribution branch pipe; 403, liquid outlet; 404, circular baffle; 4041, rectangular liquid outlet; 4042, collector; 405, horizontal axis; 406, semicircular arc blocking plate; 40 7. The third bevel gear; 5. The first rotating shaft; 501. The rotating motor; 502. The mounting rotating shaft; 5021. The second bevel gear; 503. The second rotating shaft; 5031. The reciprocating thread; 504. The fourth bevel gear; 601. The outer lifting ring; 6011. The first rack; 602. The inner lifting ring; 6021. The second rack; 6022. The connecting frame; 6023. The threaded sleeve; 603. The driving box; 6031. The vertical guide opening; 604. The spur gear; 605. The strip sealing plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] Reference Figure 1-11 , an extraction tower for mixed dinitrobenzene synthesis, comprising an extraction tower body 1, a light liquid outlet 104 is provided at the top of the extraction tower body 1, a heavy liquid outlet 103 is provided at the bottom of the extraction tower body 1, a heavy liquid inlet 101 and a light liquid inlet 102 are respectively provided at one side of the extraction tower body 1 near the top and near the bottom, a distribution mixing mechanism 4 is installed at the corresponding positions of the heavy liquid inlet 101 and the light liquid inlet 102 inside the extraction tower body 1, and a plurality of fixed plates 2 and a turntable 3 are staggered from top to bottom inside the extraction tower body 1, the fixed plate 2 is an annular structure and is fixed to the inner wall of the extraction tower body 1, and the turntable 3 is driven to rotate by a rotating motor 501 arranged at the top of the extraction tower body 1; When the heavy liquid and the light liquid enter the tower from the bottom and the top of the extraction tower body 1 respectively, due to the density difference, the heavy liquid will flow downwards and the light liquid will flow upwards. In this process, the rotating motor 501 drives the turntable 3 to rotate at a high speed, which produces a strong stirring effect on the two-phase liquid. The rotation of the turntable 3 causes the liquid to form a strong turbulence in the tower, which greatly increases the contact area and mass transfer efficiency of the two-phase liquid. The existence of the fixed plate 2 divides the internal space of the extraction tower body 1 into a series of relatively independent small chambers, which limits the direct flow of the liquid in the axial direction, so that the liquid forms a good mixture in the horizontal direction, thereby effectively reducing the possibility of axial back mixing. Every time it passes through a unit composed of a fixed ring plate and a turntable, the two-phase liquid will undergo a mixing and separation process. After passing through multiple such units, the extraction process continues, and the solute is transferred from one phase to another, and the separation purpose is finally achieved.

[0026] Example 2

[0027] Reference Figure 1-11, the difference between this embodiment and embodiment 1 is that the first rotating shaft 5 and the second rotating shaft 503 are respectively installed near the top and the bottom of the extraction tower body 1, the commutator 201 is installed on the fixed plate 2, the installation rotating shaft 502 of the turntable 3 is connected through the commutator 201, and the bottom end of the first rotating shaft 5 is connected to the top commutator 201, and the top end of the second rotating shaft 503 is connected to the bottom commutator 201. Through the transmission of the commutator 201, it is ensured that the rotation directions of adjacent turntables 3 are different, and the first bevel gear 202 is rotatably installed on the inner side wall of the commutator 201. The second bevel gear 5021 is fixed to one end of the installation rotating shaft 502, the first rotating shaft 5 and the second rotating shaft 503 extending to the inside of the commutator 201, and the first bevel gear 202 is meshed with the two second bevel gears 5021 on its upper and lower sides; When the rotating motor 501 is turned on, the rotating motor 501 directly drives the first rotating shaft 5 to rotate, thereby driving each turntable 3 to rotate in sequence through a series of commutators 201 and the meshing of the first bevel gear 202 and the second bevel gear 5021 inside the commutator 201, and ensuring that the rotation directions of adjacent turntables 3 are different. A plurality of stirring blades 301 are fixed to the top of the turntable 3. The stirring blades 301 are distributed in a ring array at the top of the turntable 3, and the liquid will form a complex and strong shear flow field between them. This flow field can fully disperse the heavy liquid and the light liquid, greatly increase the contact area of ​​the two liquids, and thus significantly improve the mass transfer efficiency.

[0028] Example 3

[0029] Reference Figure 1-11 The difference between this embodiment and embodiment 2 is that the distribution mixing mechanism 4 includes a distribution main pipe 401 and a circular baffle 404, a plurality of distribution branch pipes 402 are symmetrically distributed on both sides of the distribution main pipe 401, a plurality of rectangular liquid passage openings 4041 are opened on the circular baffle 404, and the rectangular liquid passage openings 4041 correspond to the positions of the distribution branch pipes 402, a plurality of liquid outlet holes 403 are arranged on one side of the distribution branch pipe 402 close to the circular baffle 404, and a collector 4042 is installed on one side of the circular baffle 404 close to the distribution branch pipe 402; Principle of the distribution and mixing mechanism 4: Take the light liquid as an example: when the light liquid enters the extraction tower body 1, it first enters the distribution main pipe 401, and then is evenly dispersed through the distribution branch pipe 402. The heavy liquid added from above will contact the light liquid flowing from bottom to top more evenly, thereby improving the mixing effect. The light liquid passes through the circular baffle 404 through the rectangular liquid outlet 4041, is gathered and pressurized by the collector 4042, and impacts the heavy liquid, thereby further improving the mixing effect and improving the mass transfer efficiency.

[0030] Among them, a horizontal shaft 405 is rotatably installed inside the distribution main pipe 401, and a plurality of semicircular arc plugging plates 406 are fixed outside the horizontal shaft 405. The semicircular arc plugging plates 406 are used to plug the distribution branch pipe 402, and the semicircular arc plugging plates 406 are arranged horizontally staggered. A third bevel gear 407 is fixed on the horizontal shaft 405, and the first rotating shaft 5 and the second rotating shaft 503 pass through the distribution main pipe 401, and the first rotating shaft 5 and the second rotating shaft 503 are located inside the distribution main pipe 401. The fourth bevel gear 504 is fixed, and the third bevel gear 407 is meshed with the fourth bevel gear 504; When the first rotating shaft 5 and the second rotating shaft 503 rotate, the third bevel gear 407 can be meshed with the fourth bevel gear 504 to continuously drive the horizontal shaft 405 to rotate, and by changing the position of the semi-circular arc blocking plate 406, the semi-circular arc blocking plate 406 alternately blocks the distribution branch pipes 402 on both sides of the distribution main pipe 401, so that only half of the distribution branch pipes 402 are opened at the same time, thereby pulsed spraying of liquid, increasing the pressure when the liquid is sprayed, and further improving the mixing effect.

[0031] Among them, a driving box 603, an inner lifting ring 602 and an outer lifting ring 601 are provided on the side of the circular baffle 404 away from the distribution main pipe 401. A plurality of strip-shaped plugging plates 605 are fixed at the bottom ends of the inner lifting ring 602 and the outer lifting ring 601. The positions of the strip-shaped plugging plates 605 correspond to the rectangular liquid outlet 4041. The outer lifting ring 601 is connected to the inner wall of the extraction tower body 1 through a vertical guide rail. The inner lifting ring 602 is connected to the output end of the driving box 603. The first rack 6011 and the second rack 6021 are fixed at corresponding positions on the outer lifting ring 601 and the inner lifting ring 602, respectively. A spur gear 604 is rotatably mounted on the baffle plate 404 between the first rack 6011 and the second rack 6021. The first rack 6011 and the second rack 6021 are both meshed with the spur gear 604. A connecting frame 6022 is fixed on the inner lifting ring 602. The connecting frame 6022 extends to the inside of the drive box 603 through a vertical guide opening 6031 on the drive box 603 and is fixed with a threaded sleeve 6023. The threaded sleeve 6023 is mounted on the outside of the first rotating shaft 5 and the second rotating shaft 503. The outside of the first rotating shaft 5 and the second rotating shaft 503 is provided with a reciprocating thread 5031. When the first rotating shaft 5 and the second rotating shaft 503 rotate, the cooperation between the reciprocating thread 5031 and the threaded sleeve 6023 will drive the threaded sleeve 6023 to move up and down, further drive the inner lifting ring 602 to move up and down, and then drive the outer lifting ring 601 to move synchronously in the opposite direction through the engagement of the first rack 6011, the second rack 6021 and the spur gear 604, thereby driving the inner lifting ring 602 and the outer lifting ring 601 to move up and down. The strip sealing plate 605 moves downward to block the rectangular liquid port 4041, and moves upward to open the rectangular liquid port 4041, maintaining the same sealing frequency as the semicircular arc sealing plate 406, so that when one of the distribution branches 402 is opened, the corresponding rectangular liquid port 4041 is opened, and when one of the distribution branches 402 is closed, the corresponding rectangular liquid port 4041 is closed, further improving the relative impact effect of the liquid, improving the mixing degree, and improving the extraction effect.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An extraction tower for synthesizing mixed dinitrobenzene, comprising an extraction tower body (1), wherein the top of the extraction tower body (1) is provided with a light liquid outlet (104), the bottom of the extraction tower body (1) is provided with a heavy liquid outlet (103), and one side of the extraction tower body (1) is provided with a heavy liquid inlet (101) and a light liquid inlet (102) near the top and near the bottom, respectively, wherein: The extraction tower body (1) is provided with distribution mixing mechanisms (4) at positions corresponding to the heavy liquid inlet (101) and the light liquid inlet (102), and a plurality of fixed plates (2) and rotating disks (3) are arranged alternately from top to bottom inside the extraction tower body (1), the fixed plate (2) being an annular structure and being fixed to the inner wall of the extraction tower body (1), and the rotating disk (3) being driven to rotate by a rotating motor (501) arranged at the top of the extraction tower body (1).

2. The extraction tower for mixed dinitrobenzene synthesis according to claim 1, characterized in that: A first rotating shaft (5) and a second rotating shaft (503) are respectively installed near the top and bottom of the extraction tower body (1); a commutator (201) is installed on the fixed plate (2); the mounting rotating shaft (502) of the rotating disk (3) is connected via the commutator (201); the bottom end of the first rotating shaft (5) is connected to the top commutator (201); the top end of the second rotating shaft (503) is connected to the bottom commutator (201); and the transmission of the commutator (201) ensures that the rotation directions of adjacent rotating disks (3) are different.

3. The extraction tower for mixed dinitrobenzene synthesis according to claim 2, characterized in that: The inner wall of the commutator (201) is rotatably mounted with a first bevel gear (202); the mounting shaft (502), the first shaft (5) and the second shaft (503) are connected to one end extending into the interior of the commutator (201) and a second bevel gear (5021) is fixed thereto; the first bevel gear (202) is meshed with two second bevel gears (5021) on its upper and lower sides.

4. The extraction tower for mixed dinitrobenzene synthesis according to claim 1, characterized in that: A plurality of stirring blades (301) are fixed to the top of the rotating disk (3), and the stirring blades (301) are distributed in a ring array at the top of the rotating disk (3).

5. The extraction tower for mixed dinitrobenzene synthesis according to claim 1, characterized in that: The distribution mixing mechanism (4) comprises a distribution main pipe (401) and a circular baffle (404); a plurality of distribution branch pipes (402) are symmetrically distributed on both sides of the distribution main pipe (401); a plurality of rectangular liquid passage openings (4041) are provided on the circular baffle (404); and the positions of the rectangular liquid passage openings (4041) correspond to those of the distribution branch pipes (402).

6. The extraction tower for mixed dinitrobenzene synthesis according to claim 5, characterized in that: A plurality of liquid outlet holes (403) are provided on one side of the distribution branch pipe (402) close to the circular baffle plate (404), and a collector (4042) is installed on one side of the circular baffle plate (404) close to the distribution branch pipe (402).

7. The extraction tower for mixed dinitrobenzene synthesis according to claim 5, characterized in that: A horizontal axis (405) is rotatably mounted inside the distribution main pipe (401), and a plurality of semi-circular arc blocking plates (406) are fixed outside the transverse axis (405). The semi-circular arc blocking plates (406) are used to block the distribution branch pipes (402), and the semi-circular arc blocking plates (406) are arranged in a horizontal staggered manner.

8. The extraction tower for mixed dinitrobenzene synthesis according to claim 7, characterized in that: A third bevel gear (407) is fixed on the transverse shaft (405), the first rotating shaft (5) and the second rotating shaft (503) pass through the distribution main pipe (401), and a fourth bevel gear (504) is fixed at a position inside the distribution main pipe (401) between the first rotating shaft (5) and the second rotating shaft (503), and the third bevel gear (407) is meshed with the fourth bevel gear (504).

9. The extraction tower for mixed dinitrobenzene synthesis according to claim 8, characterized in that: A driving box (603), an inner lifting ring (602) and an outer lifting ring (601) are provided on the side of the circular baffle (404) away from the distribution main pipe (401); a plurality of strip-shaped blocking plates (605) are fixed to the bottom ends of the inner lifting ring (602) and the outer lifting ring (601); the outer lifting ring (601) is connected to the inner wall of the extraction tower body (1) via a vertical guide rail; the inner lifting ring (602) is connected to the output end of the driving box (603); a first rack (6011) and a second rack (6021) are fixed to corresponding positions on the outer lifting ring (601) and the inner lifting ring (602); a spur gear (604) is rotatably installed between the first rack (6011) and the second rack (6021) on the circular baffle (404); the first rack (6011) and the second rack (6021) are both meshed with the spur gear (604).

10. The extraction tower for mixed dinitrobenzene synthesis according to claim 9, characterized in that: A connecting frame (6022) is fixed on the inner lifting ring (602), the connecting frame (6022) extends to the interior of the driving box (603) through a vertical guide opening (6031) on the driving box (603) and is fixed with a threaded sleeve (6023), the threaded sleeve (6023) is installed on the outside of the first rotating shaft (5) and the second rotating shaft (503), and the outside of the first rotating shaft (5) and the second rotating shaft (503) is provided with a reciprocating thread (5031).

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