An extraction column for the synthesis of mixed dinitrobenzene

Abstract

The present invention discloses an extraction tower for the synthesis of mixed dinitrobenzene, which comprises an extraction tower body. 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. A heavy liquid inlet and a light liquid inlet are respectively provided at positions near the top and near the bottom on one side of the extraction tower body. Distribution and mixing mechanisms are installed at positions corresponding to the heavy liquid inlet and the light liquid inlet inside the extraction tower body. A plurality of fixed plates and rotating discs are arranged alternately from top to bottom inside the extraction tower body. The fixed plates are of an annular structure and are fixed to the inner wall of the extraction tower body. Through the distribution and mixing mechanism of the present invention, the fluid distribution is optimized. The distribution main pipe and the branch pipes enable the liquid to be evenly dispersed, and the circular baffles and the aggregators enhance the mixing effect and improve the mass transfer efficiency. The rotating disc and the stirring blades form turbulence in the liquid under the drive of the rotating motor, increasing the contact area. The fixed plates separate the space to reduce axial backmixing, further enhancing the mixing and mass transfer.

Description

Technical Field

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

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

[0003] From the perspective of fluid distribution, conventional distribution methods are difficult to achieve uniform dispersion of the heavy liquid and the light liquid in the tower. Some traditional extraction towers only use simple pipeline feeding, resulting in too high or too low concentrations of the fluid in local areas of the tower, where they cannot come into full contact, seriously affecting the extraction efficiency. For example, in the synthesis of mixed dinitrobenzene, if the heavy liquid and the light liquid cannot be evenly distributed, their contact will be insufficient, wasting some raw materials and reducing the purity of the product at the same time.

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

[0005] In summary, the existing extraction towers have many defects in the mixed dinitrobenzene synthesis process. There is an urgent need for a new type of extraction tower that can optimize fluid distribution and enhance the mass transfer effect in mixing to meet the growing production demand and improve production efficiency and product quality. Summary of the Invention

[0006] To solve the problems mentioned in the above background art, the present invention provides an extraction tower for mixed dinitrobenzene synthesis.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] An extraction tower for mixed dinitrobenzene synthesis, comprising an extraction tower body. 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. A heavy liquid inlet and a light liquid inlet are respectively provided at positions near the top and near the bottom on one side of the extraction tower body. Distribution and mixing mechanisms are installed at positions corresponding to the heavy liquid inlet and the light liquid inlet inside the extraction tower body. A plurality of fixed plates and turntables are arranged alternately from top to bottom inside the extraction tower body. The fixed plates are of an annular structure and are fixed to the inner wall of the extraction tower body. The turntables are driven to rotate by a rotary motor provided at the top of the extraction tower body.

[0009] Preferably, a first rotating shaft and a second rotating shaft are respectively installed near the top and bottom inside the extraction tower body. A commutator is installed on the fixed plate. The installation rotating shaft of the turntable is connected through the commutator. The bottom end of the first rotating shaft is connected to the uppermost commutator, and the top end of the second rotating shaft is connected to the lowermost commutator. Through the transmission of the commutator, the rotation directions of adjacent turntables are ensured to be different.

[0010] Preferably, a first bevel gear is rotatably installed on the inner side wall of the commutator. Second bevel gears are fixed to one ends of the installation rotating shaft, the first rotating shaft, and the second rotating shaft extending into the commutator. The first bevel gear meshes with the two second bevel gears above and below it.

[0011] Preferably, a plurality of stirring blades are fixed to the top end of the turntable, and the stirring blades are annularly and arrayedly distributed on the top end of the turntable.

[0012] Preferably, the distribution and 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. A plurality of rectangular liquid passing openings are formed on the circular baffle, and the positions of the rectangular liquid passing openings correspond to those of the distribution branch pipes.

[0013] Preferably, a plurality of liquid outlet holes are provided on one side of the distribution branch pipe close to the circular baffle, and an aggregator is installed on one side of the circular baffle close to the distribution branch pipe.

[0014] Preferably, a horizontal shaft is rotatably installed inside the distribution main pipe. A plurality of semi-circular blocking plates are fixed to the outside of the horizontal shaft. The semi-circular blocking plates are used to block the distribution branch pipes, and the semi-circular blocking plates are arranged horizontally and staggeredly.

[0015] Preferably, a third bevel gear is fixed to the horizontal shaft. The first rotating shaft and the second rotating shaft penetrate through the distribution main pipe, and fourth bevel gears are fixed to the positions of the first rotating shaft and the second rotating shaft inside the distribution main pipe. The third bevel gear meshes with the fourth bevel gear.

[0016] Preferably, a drive box, an inner lifting ring, and an outer lifting ring are provided on one side of the circular baffle away from the distribution main pipe. A plurality of strip-shaped blocking 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 drive box. First racks and second racks are respectively fixed to 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. Both the first rack and the second rack mesh with the spur gear.

[0017] Preferably, a connecting frame is fixed to the inner lifting ring. The connecting frame extends into the drive box through a vertical guiding 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 reciprocating threads are provided on the outside of the first rotating shaft and the second rotating shaft.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Optimize fluid distribution: The present invention creatively provides a distribution and mixing mechanism, which solves the problem of uneven fluid distribution in traditional extraction towers. Through the ingenious design of the distribution main pipe and distribution branch pipes, the heavy liquid and light liquid can be evenly dispersed. Through the combination of the circular baffle and the aggregator, the rectangular liquid passing ports on the circular baffle guide the liquid flow, and the aggregator aggregates and pressurizes the liquid. The two work together to enable the liquids of different phases to mix more fully when they meet, enhancing the mixing effect and improving the mass transfer efficiency.

[0020] 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 a high speed, and the stirring blades stir the liquid, causing strong turbulence in the tower. This turbulent state greatly increases the contact area between the two-phase liquids, enabling the solute to transfer more rapidly between different phases and improving the mass transfer efficiency. At the same time, the fixed plate divides the space inside the tower into multiple relatively independent small chambers, effectively blocking the direct flow of the liquid in the axial direction, reducing the possibility of axial backmixing, and allowing the liquid to mix fully in the small chambers, further optimizing the overall mixing effect.

[0021] 3. Pulsed liquid injection: The present invention realizes the alternating opening and closing of the distribution branch pipes through the cooperation of the semi-circular blocking plate and the horizontal shaft, forming a pulsed liquid injection mode. When the first rotating shaft and the second rotating shaft rotate, the horizontal shaft is driven to rotate through the meshing of the third bevel gear and the fourth bevel gear, changing the position of the semi-circular blocking plate, so that only half of the distribution branch pipes are open at the same time. This pulsed injection increases the pressure when the liquid is ejected, allowing the liquid to enter the tower to participate in the mixing with a stronger momentum, further improving the mixing effect and extraction efficiency.

[0022] 4. Automatic blocking control: Through the cooperation of the strip-shaped blocking plate with the inner lifting ring and the outer lifting ring, when the first rotating shaft and the second rotating shaft rotate, the reciprocating thread and the thread sleeve cooperate to drive 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 is driven to move synchronously in the opposite direction, thereby driving the strip-shaped blocking plate to automatically control the opening and closing of the rectangular liquid passing port. Moreover, its opening and closing frequency is consistent with that of the distribution branch pipes, ensuring that when the distribution branch pipes are open, the corresponding rectangular liquid passing ports are also open, and vice versa. This precise automatic control further enhances the impact effect of the liquid, enabling the liquid to mix more fully, and significantly improving the mixing degree and extraction efficiency. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Isometric view of the present invention;

[0025] Figure 2 Front view cross-section of the present invention;

[0026] Figure 3 Isometric cross-section of the present invention;

[0027] Figure 4 First perspective view of the relative position relationship between the distribution main pipe and the circular baffle of the present invention;

[0028] Figure 5 Second perspective view of the relative position relationship between the distribution main pipe and the circular baffle of the present invention;

[0029] Figure 6 Structural schematic diagram of the circular baffle of the present invention;

[0030] Figure 7 Distribution schematic diagram of the semi-circular sealing plate on the semi-circular sealing plate of the present invention;

[0031] Figure 8 Cross-section view of the drive box of the present invention;

[0032] Figure 9 Arrangement schematic diagram of the fixing plate and the turntable of the present invention;

[0033] Figure 10 Cross-section view of the commutator of the present invention;

[0034] Figure 11 Cross-section view of the distribution main pipe of the present invention;

[0035] 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 hole; 404. Circular baffle; 4041. Rectangular liquid passing opening; 4042. Aggregator; 405. Horizontal shaft; 406. Semi-circular sealing plate; 407. Third bevel gear; 5. First rotating shaft; 501. Rotating motor; 502. Mounting rotating shaft; 5021. Second bevel gear; 503. Second rotating shaft; 5031. Reciprocating thread; 504. Fourth bevel gear; 6. Vertical guide rail; 601. Outer lifting ring; 6011. First rack; 602. Inner lifting ring; 6021. Second rack; 6022. Connecting frame; 6023. Threaded sleeve; 603. Driving box; 6031. Vertical guiding opening; 604. Straight gear; 605. Strip-shaped sealing plate. Detailed implementation mode

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1

[0038] Refer to Figures 1-11 , an extraction tower for the synthesis of mixed dinitrobenzene, including 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 positions near the top and near the bottom on one side of the extraction tower body 1. Distribution and mixing mechanisms 4 are installed at positions corresponding to 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 turntables 3 are arranged alternately from top to bottom inside the extraction tower body 1. The fixed plate 2 is of 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 provided at the top of the extraction tower body 1;

[0039] After the heavy liquid and the light liquid enter the extraction tower body 1 from the bottom and the top respectively, due to the density difference, the heavy liquid will flow downward and the light liquid will flow upward. During this process, the rotary motor 501 drives the driving turntable 3 to rotate at a high speed, generating a strong stirring effect on the two-phase liquid. The rotation of the turntable 3 causes the liquid to form strong turbulence in the tower, greatly increasing the contact area and mass transfer efficiency of the two-phase liquid. The presence of the fixing plate 2 divides the internal space of the extraction tower body 1 into a series of relatively independent small chambers, restricting the direct flow of the liquid in the axial direction and enabling the liquid to form good mixing in the horizontal direction, thereby effectively reducing the possibility of axial backmixing. Every time the two-phase liquid passes through a unit composed of a fixed ring plate and a turntable, a process of mixing and separation will occur. After passing through multiple such units, the extraction process continues, and the solute is transferred from one phase to another, ultimately achieving the separation purpose.

[0040] Example 2

[0041] Refer to Figures 1-11 , the difference between this embodiment and Embodiment 1 is that a first rotating shaft 5 and a second rotating shaft 503 are respectively installed near the top and bottom positions inside the extraction tower body 1. A commutator 201 is installed on the fixing plate 2. The installation rotating shaft 502 of the turntable 3 is connected through the commutator 201. The bottom end of the first rotating shaft 5 is connected to the uppermost commutator 201, and the top end of the second rotating shaft 503 is connected to the lowermost commutator 201. Through the transmission of the commutator 201, it is ensured that the rotation directions of adjacent turntables 3 are different. A first bevel gear 202 is rotatably installed on the inner side wall of the commutator 201. A second bevel gear 5021 is fixed at one end of the installation rotating shaft 502, the first rotating shaft 5, and the second rotating shaft 503 extending into the commutator 201. The first bevel gear 202 meshes with the two second bevel gears 5021 above and below it;

[0042] When the rotary motor 501 is started, the rotary motor 501 directly drives the first rotating shaft 5 to rotate. Thus, 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, each turntable 3 can be driven to rotate in sequence, and it is ensured that the rotation directions of adjacent turntables 3 are different. A plurality of stirring blades 301 are fixed at the top end of the turntable 3. The stirring blades 301 are annularly arrayed at the top end of the turntable 3. A complex and strong shear flow field will be formed between them for the liquid. This flow field can fully disperse the heavy liquid and the light liquid, greatly increasing the contact area of the two liquids, thereby significantly improving the mass transfer efficiency.

[0043] Example 3

[0044] Refer to Figures 1-11, The difference between this embodiment and Embodiment 2 is that the distribution and 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 passing ports 4041 are formed on the circular baffle 404. The positions of the rectangular liquid passing ports 4041 correspond to those of the distribution branch pipes 402. A plurality of liquid outlet holes 403 are provided on the side of the distribution branch pipe 402 close to the circular baffle 404. A concentrator 4042 is installed on the side of the circular baffle 404 close to the distribution branch pipe 402;

[0045] Principle of the distribution and mixing mechanism 4: Taking 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 pipes 402. The heavy liquid added from above will contact the light liquid flowing from bottom to top more evenly, improving the mixing effect. And the light liquid passes through the circular baffle 404 through the rectangular liquid passing ports 4041, is concentrated and pressurized by the concentrator 4042, and impacts with the heavy liquid, further improving the mixing effect and the mass transfer efficiency.

[0046] Among them, a horizontal shaft 405 is rotatably installed inside the distribution main pipe 401. A plurality of semi-circular blocking plates 406 are fixed on the outside of the horizontal shaft 405. The semi-circular blocking plates 406 are used to block the distribution branch pipes 402, and the semi-circular blocking plates 406 are arranged horizontally in a staggered manner. A third bevel gear 407 is fixed on the horizontal shaft 405. The first rotating shaft 5 and the second rotating shaft 503 penetrate the distribution main pipe 401, and a fourth bevel gear 504 is fixed at the position of the first rotating shaft 5 and the second rotating shaft 503 inside the distribution main pipe 401. The third bevel gear 407 meshes with the fourth bevel gear 504;

[0047] When the first rotating shaft 5 and the second rotating shaft 503 rotate, the horizontal shaft 405 can be continuously driven to rotate through the meshing of the third bevel gear 407 and the fourth bevel gear 504. By changing the position of the semi-circular blocking plate 406, the semi-circular 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 pulsatingly spraying the liquid, increasing the pressure when the liquid is sprayed, and further improving the mixing effect.

[0048] Wherein, on one side of the circular baffle 404 away from the distribution main pipe 401, there are a drive box 603, an inner lifting ring 602 and an outer lifting ring 601. A plurality of strip-shaped sealing 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 sealing plates 605 correspond to the rectangular liquid passing ports 4041. The outer lifting ring 601 is connected to the inner wall of the extraction tower body 1 through a vertical guide rail 6. The inner lifting ring 602 is connected to the output end of the drive box 603. At corresponding positions on the outer lifting ring 601 and the inner lifting ring 602, a first rack 6011 and a second rack 6021 are respectively fixed. A spur gear 604 is rotatably installed on the circular baffle 404 between the first rack 6011 and the second rack 6021. Both the first rack 6011 and the second rack 6021 are meshed with the spur gear 604. A connecting frame 6022 is fixed on the inner lifting ring 602. The connecting frame 6022 extends into the drive box 603 through a vertical guiding opening 6031 on the drive box 603 and is fixed with a threaded sleeve 6023. The threaded sleeve 6023 is installed on the outer parts of the first rotating shaft 5 and the second rotating shaft 503, and a reciprocating thread 5031 is provided on the outer parts of the first rotating shaft 5 and the second rotating shaft 503;

[0049] 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 driving the inner lifting ring 602 to move up and down. Then, through the meshing of the first rack 6011, the second rack 6021 and the spur gear 604, the outer lifting ring 601 is driven to move synchronously and in the opposite direction, thereby driving the strip-shaped sealing plates 605 connected to the inner lifting ring 602 and the outer lifting ring 601 to move up and down. When the strip-shaped sealing plate 605 moves downward, the rectangular liquid passing port 4041 can be blocked. When the strip-shaped sealing plate 605 moves upward, the rectangular liquid passing port 4041 is opened, maintaining the same blocking frequency as the semi-circular arc sealing plate 406. When one of the distribution branch pipes 402 is opened, the corresponding rectangular liquid passing port 4041 is opened. When one of the distribution branch pipes 402 is closed, the corresponding rectangular liquid passing port 4041 is closed, further improving the relative impact effect of the liquid, enhancing the mixing degree, and improving the extraction effect.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0051] In the present invention, unless otherwise clearly specified or limited, terms such as "arranged", "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The control mode of the present invention is automatically controlled by a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The provision of power supply also belongs to the common general knowledge in the art, and the present invention is mainly used to protect mechanical devices, so the control mode and circuit connection of the present invention will not be explained in detail herein.

[0053] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An extraction tower for the synthesis of mixed dinitrobenzene, comprising an extraction tower body (1). A light liquid outlet (104) is provided at the top of the extraction tower body (1), and 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 positions near the top and near the bottom on one side of the extraction tower body (1), and it is characterized in that: Inside the extraction tower body (1), distribution and mixing mechanisms (4) are installed at positions corresponding to the heavy liquid inlet (101) and the light liquid inlet (102). Inside the extraction tower body (1), a plurality of fixed plates (2) and turntables (3) are arranged in a staggered manner from top to bottom. The fixed plate (2) is of an annular structure and is fixed to the inner wall of the extraction tower body (1). The turntable (3) is driven to rotate by a rotating motor (501) arranged at the top of the extraction tower body (1). The distribution and 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 passing openings (4041) are formed in the circular baffle (404), and the positions of the rectangular liquid passing openings (4041) correspond to those of the distribution branch pipes (402). A plurality of liquid outlet holes (403) are arranged on the side of the distribution branch pipe (402) close to the circular baffle (404). An aggregator (4042) is installed on the side of the circular baffle (404) close to the distribution branch pipe (402). Taking 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 pipes (402). The heavy liquid added from above will contact the light liquid flowing from bottom to top more evenly, improving the mixing effect. Moreover, the light liquid passes through the circular baffle (404) through the rectangular liquid passing openings (4041), is aggregated and pressurized by the aggregator (4042), and impacts with the heavy liquid, further improving the mixing effect and the mass transfer efficiency.

2. The extraction tower for synthesizing mixed dinitrobenzene according to claim 1, characterized in that: A first rotating shaft (5) and a second rotating shaft (503) are respectively installed at positions close to the top and bottom inside the extraction tower body (1). A commutator (201) is installed on the fixed plate (2). The installation rotating shaft (502) of the turntable (3) is connected through the commutator (201). The bottom end of the first rotating shaft (5) is connected to the uppermost commutator (201), and the top end of the second rotating shaft (503) is connected to the lowermost commutator (201). Through the transmission of the commutator (201), it is ensured that the rotation directions of adjacent turntables (3) are different.

3. The extraction column for synthesizing mixed dinitrobenzene according to claim 2, wherein: A first bevel gear (202) is rotatably installed on the inner side wall of the commutator (201). A 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 into the commutator (201). The first bevel gear (202) meshes with the two second bevel gears (5021) above and below it.

4. An extraction column for synthesizing mixed dinitrobenzene according to claim 1, characterized in that: A plurality of stirring blades (301) are fixed to the top end of the turntable (3), and the stirring blades (301) are distributed in an annular array at the top end of the turntable (3).

5. An extraction column for synthesizing mixed dinitrobenzene according to claim 1, characterized in that: A horizontal shaft (405) is rotatably installed inside the distribution main pipe (401). A plurality of semi-circular sealing plates (406) are fixed to the outside of the horizontal shaft (405). The semi-circular sealing plates (406) are used to seal the distribution branch pipes (402), and the semi-circular sealing plates (406) are arranged in a horizontal and staggered manner.

6. An extraction column for the synthesis of mixed dinitrobenzene according to claim 5, characterized in that: A third bevel gear (407) is fixed on the horizontal shaft (405). The first rotating shaft (5) and the second rotating shaft (503) penetrate through the distribution main pipe (401), and a fourth bevel gear (504) is fixed at the position of the first rotating shaft (5) and the second rotating shaft (503) inside the distribution main pipe (401). The third bevel gear (407) meshes with the fourth bevel gear (504).

7. An extraction column for synthesizing mixed dinitrobenzene according to claim 6, characterized in that: On the side of the circular baffle (404) away from the distribution main pipe (401), there are a drive box (603), an inner lifting ring (602) and an outer lifting ring (601). A plurality of strip-shaped sealing plates (605) are fixed at 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) through a vertical guide rail (6). The inner lifting ring (602) is connected to the output end of the drive box (603). A first rack (6011) and a second rack (6021) are respectively fixed at corresponding positions on the outer lifting ring (601) and the inner lifting ring (602). A spur gear (604) is rotatably installed on the circular baffle (404) between the first rack (6011) and the second rack (6021). Both the first rack (6011) and the second rack (6021) mesh with the spur gear (604).

8. An extraction column for synthesizing mixed dinitrobenzene according to claim 7, characterized in that: A connecting frame (6022) is fixed on the inner lifting ring (602). The connecting frame (6022) extends into the drive box (603) through a vertical guiding opening (6031) on the drive 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 a reciprocating thread (5031) is provided on the outside of the first rotating shaft (5) and the second rotating shaft (503).

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