Pyrrole nitrile purification equipment based on rectification technology

Abstract

The invention relates to pyrrole nitrile purification equipment based on a rectification technology, and belongs to the technical field of rectification equipment. Comprising a tower body and a commutation assembly arranged in the tower body, the commutation assembly comprises an overflow ring fixedly connected to the interior of the tower body and a tower plate rotationally connected to the inner side of the overflow ring, and the overflow ring is an annular plate spaced from the inner wall of the tower body; a plurality of fixed plates are fixedly connected between the overflow ring and the tower body, the fixed plates are vertically arranged, a rotating ring groove is formed in the lower part of the middle of the inner side of the overflow ring, the outer edge of the tower plate is rotationally connected into the rotating ring groove, the tower plate is arranged to be an arc-shaped plate which is sunken downwards, and current conversion assemblies are uniformly distributed on the tower plate. And a driving assembly for driving the plurality of layers of tower plates to synchronously rotate is arranged on the outer side of the tower body. According to the invention, the problems of too high tower body and low space utilization rate of the rectifying tower for purifying the pyrrole nitrile in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to a pyrrole nitrile purification device based on distillation technology, belonging to the technical field of distillation equipment. Background Art

[0002] Pyrrole nitrile is a class of organic compounds containing a pyrrole ring (five-membered nitrogen heterocycle) and a cyano group (-CN), with significant biological activity and chemical diversity. As a key intermediate, it is widely used in the fields of medicine, pesticides, and fine chemicals. For example, by introducing different functional groups, highly efficient and low-toxic pesticides (such as bromo-pyrrole nitrile), herbicides, and nitrogen-containing heterocyclic drugs can be synthesized. The pyrrole ring and cyano group in its structure endow the molecule with polarity and reactivity, making it easy to participate in condensation, substitution, and other reactions, thereby deriving a variety of high-value-added products.

[0003] Due to the presence of functional groups such as halogens and cyano groups, bromo-pyrrole nitrile has special chemical reactivity and can be further converted into a variety of useful compounds. During the production process, the wastewater generated contains high concentrations of salts such as sodium chloride and ammonium sulfate, and appropriate treatment processes are required to ensure compliance with environmental protection discharge standards.

[0004] After retrieval, a treatment device and method for high-concentration ammonium sulfate-containing organic wastewater disclosed in a Chinese patent with the publication number CN110627287B have the following technical key points: including a pump, a primary extraction tower, a secondary extraction tower, a neutralization tank, an MVR evaporator, a crystallization kettle, a filter, a dryer, a solvent recovery tower, and a dehydration tower. The high-concentration ammonium sulfate-containing organic industrial wastewater is sent to the primary extraction tower to contact the extractant countercurrently for extraction. The raffinate is sent to the secondary extraction tower for continued countercurrent contact extraction. The raffinate after neutralization is sent to the MVR evaporator to remove most of the water and then sent to the crystallization kettle for cooling crystallization. After filtration with a filter and drying, industrial salt is obtained, and the mother liquor is returned to the wastewater tank. The extraction liquids obtained from the primary extraction tower and the secondary extraction tower are sent to the solvent recovery tower to recover the extractant. The liquid after removing the solvent is dehydrated by the dehydration tower and then returned to the production process for recycling.

[0005] In the above solution, the solvent is recovered through a distillation column. However, traditional distillation columns often require multiple trays to achieve the required separation efficiency. However, conventional trays use a static liquid distribution method, resulting in liquid holdup areas and gas short-circuit phenomena, and a low gas-liquid mass transfer interface renewal rate, leading to insufficient single-tray efficiency. Especially for the high-viscosity characteristics of cyano compounds in the pyrrole nitrile system, fixed trays are prone to flooding and wall flow. This forces the device to increase the number of trays to compensate for efficiency losses, resulting in a significant increase in the height of the tower body, low space utilization, and an increase in equipment investment costs and limitations in plant construction.

[0006] Therefore, a new solution needs to be proposed to solve this problem. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a pyrrole nitrile purification device based on rectification technology, which solves the problems of too high tower body of the rectification tower for purifying pyrrole nitrile and low space utilization rate in the prior art.

[0008] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: A pyrrole nitrile purification device based on rectification technology includes a tower body and a flow conversion component arranged in the tower body. The flow conversion component includes an overflow ring fixedly connected in the tower body, a tower plate rotatably connected inside the overflow ring, and a jet component evenly distributed on the tower plate. The overflow ring is an annular plate arranged at an interval with the inner wall of the tower body. A plurality of fixing plates are fixedly connected between the overflow ring and the tower body. The fixing plates are arranged vertically. A rotating ring groove is provided in the lower part of the middle inside the overflow ring. The outer edge of the tower plate is rotatably connected in the rotating ring groove. The tower plate is set as an arc-shaped plate recessed downward. The tower plate is evenly provided with a flow conversion component. A driving component for driving a plurality of layers of tower plates to rotate synchronously is arranged outside the tower body.

[0009] The present invention is further set as: The jet component includes a through hole opened on the tower plate, an air inlet pipe rotatably connected in the through hole and extending above the tower plate, a fixing ring fixedly connected to the top end of the air inlet pipe, a floating ring slidably connected to the air inlet pipe and located below the fixing ring, and a plurality of jet parts evenly distributed around the floating ring. The jet direction of the jet part is along the chord tangent direction of the floating ring. The top end of the air inlet pipe is closed. A plurality of first connection holes are opened on the fixing ring. Second connection holes are opened on the floating ring. One end of the first connection hole communicates with the inside of the air inlet pipe and the other end communicates with the bottom end face of the fixing ring. One end of the second connection hole communicates with the top end face of the floating ring and the other end communicates with the jet part. A connection hose with two ends respectively communicating with the first connection hole and the second connection hole is arranged between the fixing ring and the floating ring. An elastic telescopic ring is arranged between the fixing ring and the floating ring. The connection hose is located inside the elastic telescopic ring.

[0010] The present invention is further configured as follows: The jetting member includes a connection shell fixedly connected to the floating ring, a rotating column core rotatably connected inside the connection shell, and jetting heads arranged on the periphery of the rotating column core. A first rotating groove is formed on one side of the connection shell away from the floating ring, and the first rotating groove extends in an arc shape along the edge of the connection shell. The jetting heads pass through the first rotating groove and extend to the outside of the connection shell. A chamfer is provided on one side edge of the rotating column core, and the jetting heads are fixedly connected to the chamfer. A connection groove is formed on the peripheral wall of the rotating column core close to the second connection hole, and the connection groove communicates with the other end of the second connection hole. A third connection hole is formed inside the rotating column core, with one end communicating with the connection groove and the other end communicating with the jetting heads. A second rotating groove is formed on one end face of the connection shell close to the floating ring and below the axis of the rotating column core, and the second rotating groove extends in an arc shape around the axis of the rotating column core. A floating block fixedly connected to the end face of the rotating column core passes through the second rotating groove and extends to the outside of the connection shell.

[0011] The present invention is further configured as follows: The driving assembly includes an installation shell fixedly connected to the outer wall of the tower body and extending along the length direction of the tower body, a driving shaft rotatably connected inside the installation shell, a driving motor connected to the bottom end of the driving shaft, and driving gears coaxially and fixedly connected to the driving shaft and corresponding to the tower plates one by one. An outer tooth ring rotatably connected in the rotating ring groove is fixedly connected to the outer edge of the tower plate. A through groove is formed on the tower body, and one side of the driving gear passes through the through groove and meshes with the outer tooth ring.

[0012] The present invention is further configured as follows: A guide plate is provided above the overflow ring. The guide plate is arranged in a ring shape around the tower body and fixedly connected to the inner wall of the tower body. The inner edge of the guide plate is set to be constricted towards the axis of the tower body, and the inner diameter of the guide plate is not greater than the inner diameter of the overflow ring.

[0013] The present invention is further configured as follows: A flow equalizing plate is provided at the bottom of the tower plate. Flow equalizing holes are formed on the flow equalizing plate. The flow equalizing plate is set as an arc-shaped plate that matches the tower plate. The outer edge at the top of the flow equalizing plate is connected to the tower plate through a plurality of fixing rods.

[0014] The present invention is further configured as follows: The flow equalizing holes are arranged obliquely along the rotation direction of the flow equalizing plate.

[0015] The beneficial effects of the present invention are: 1. By setting up a driving component in cooperation with the tray, the arc-shaped tray continuously rotates driven by the driving component to form a centrifugal flow field, distributing the liquid-phase material evenly on the distribution plate. The centrifugal force evenly throws the liquid-phase material towards the edge of the tray, forming a dynamic liquid film. In cooperation with the air jet component, the contact area between the liquid-phase and gas-phase materials is increased, greatly improving the space utilization rate inside the tower body; the overflow ring is arranged with a gap from the edge of the rotating tray, and the liquid phase enters the next tray through the gap under the action of centrifugal force, eliminating the risk of liquid flooding; 2. The air jet component jets high-speed air flow along the tangent direction of the floating ring chord, and its jet direction forms a cooperative swirling flow field with the rotation direction of the tray. On the one hand, the tangential air flow forms a rotational shear force on the surface of the liquid layer, disturbing the liquid-phase material; on the other hand, the jet reaction force drives the intake pipe to generate a self-rotating motion. This combined motion enables the gas phase to form a spiral upward bubble trajectory in the liquid phase, prolonging the gas-liquid contact time. The elastic expansion ring maintains the airtightness of the air path when the floating ring floats up and down, ensuring stable air supply at different liquid levels, and enabling the ejected air flow to spread evenly in the liquid-phase material; 3. By setting up a rotating column core to drive the air jet head to rotate, when the depth of the liquid-phase material on the tray is large, the buoyancy pushes the floating block to slide along the second rotating groove, driving the rotating column core to rotate, causing the air jet head to deflect downward. At this time, the air flow penetrates the bottom of the liquid layer at a diving angle, forming a dense bubble group in the high-pressure area. When the liquid level drops, the floating ring moves downward under the action of gravity, and the air jet head resumes a small-angle horizontal jet, forming an umbrella-shaped air flow with wide-area coverage, realizing automatic adjustment of the air jet angle; 4. When the flow equalizing plate rotates synchronously with the tray, the inclined flow equalizing holes play a guiding role in the rising gas phase: the inclination angle of the hole channels enables the gas to obtain a tangential velocity component, forming a spiral upward trajectory. At the same time, the centrifugal force generated by the rotation throws the heavy-component steam towards the tower wall, completing preliminary separation before entering the upper tray. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0018] Figure 3 It is Figure 2 A partial enlarged view of part A in

[0019] Figure 4 It is a schematic diagram of the structure of the commutation component part of the present invention.

[0020] Figure 5 It is a schematic diagram of the structure of the flow equalizing plate part of the present invention.

[0021] Figure 6 It is a cross-sectional view of the air jet component part of the present invention.

[0022] Figure 7 It is a schematic structural diagram of the jet component part in the present invention.

[0023] In the figure: 1, tower body; 2, commutation component; 3, pipeline interface; 4, overflow ring; 5, tray; 6, fixing plate; 7, deflector plate; 8, rotating ring groove; 9, external gear ring; 10, flow equalizing plate; 11, flow equalizing holes; 12, fixing rod; 13, driving component; 14, mounting shell; 15, driving shaft; 16, driving motor; 17, driving gear; 18, through groove; 19, perforation; 20, intake pipe; 21, fixing ring; 22, floating ring; 23, jet part; 24, axial limit; 25, spline; 26, first connection hole; 27, second connection hole; 28, connection hose; 29, elastic telescopic ring; 30, connection shell; 31, rotating column core; 32, jet head; 33, first rotating groove; 34, connection groove; 35, third connection hole; 36, second rotating groove; 37, floating block; 38, jet component. Specific embodiments

[0024] In order to clearly understand the technical means, creative features, achieved purposes and effects of the present invention, the present invention will be further described below with reference to specific drawings.

[0025] As Figures 1 - 7 shown, the pyrrole nitrile purification equipment based on distillation technology includes a tower body 1 and a commutation component 2 arranged in the tower body 1. Among them, pipeline interfaces 3 for circulating gas-liquid phases and for feeding are respectively provided at the top, bottom and side wall of the tower body 1.

[0026] A number of groups of commutation components 2 are evenly arranged along the height direction of the tower body 1. The commutation component 2 includes an overflow ring 4 fixedly connected inside the tower body 1, a tray 5 rotatably connected inside the overflow ring 4, and jet components 38 evenly distributed on the tray 5. Among them, the overflow ring 4 is an annular plate arranged at an interval with the inner wall of the tower body 1. A number of fixing plates 6 are fixedly connected between the overflow ring 4 and the tower body 1. The fixing plates 6 are arranged vertically. A deflector plate 7 is provided above the overflow ring 4. The deflector plate 7 is arranged in a ring around the tower body 1 and fixedly connected to the inner wall of the tower body 1. The inner edge of the deflector plate 7 is set to be closed towards the axis of the tower body 1, and the inner diameter of the deflector plate 7 is not greater than the inner diameter of the overflow ring 4.

[0027] A rotating ring groove 8 is provided in the lower middle part inside the overflow ring 4. The rotating ring groove 8 is formed by the overflow ring 4 being recessed towards the outside. The tray 5 is set as an arc-shaped plate recessed downward and is spherical. The outer edge of the tray 5 is rotatably connected in the rotating ring groove 8, and an external gear ring 9 rotatably connected in the rotating ring groove 8 is fixedly connected to the outer edge of the tray 5.

[0028] A flow equalizing plate 10 is provided at the bottom of the tray 5. The flow equalizing plate 10 is an arc-shaped plate configured to cooperate with the tray 5. The outer edge at the top of the flow equalizing plate 10 is connected to the tray 5 through a plurality of fixing rods 12. Flow equalizing holes 11 are formed in the flow equalizing plate 10, and the flow equalizing holes 11 are inclined along the rotation direction of the flow equalizing plate 10. When the flow equalizing plate 10 rotates synchronously with the tray 5, the inclined flow equalizing holes 11 have a guiding effect on the rising gas phase. The inclination angle of the hole passage enables the gas to obtain a tangential velocity component, forming a spiral rising trajectory. At the same time, the centrifugal force generated by the rotation throws the heavy component vapor towards the tower wall, completing preliminary separation before entering the upper tray 5.

[0029] A driving assembly 13 for driving a plurality of trays 5 to rotate synchronously is provided outside the tower body 1. The driving assembly 13 includes a mounting shell 14 fixedly connected to the outer wall of the tower body 1 and extending along the length direction of the tower body 1, a driving shaft 15 rotatably connected inside the mounting shell 14, a driving motor 16 connected to the bottom end of the driving shaft 15, and driving gears 17 coaxially and fixedly connected to the driving shaft 15 and corresponding to the trays 5 one by one. A through slot 18 is formed in the tower body 1, and one side of the driving gear 17 passes through the through slot 18 and meshes with the external tooth ring 9.

[0030] By providing the driving assembly 13 to cooperate with the tray 5, the arc-shaped tray 5 continuously rotates under the drive of the driving assembly 13, forming a centrifugal flow field, and evenly distributing the liquid-phase material plate. The centrifugal force evenly throws the liquid-phase material towards the edge of the tray 5, forming a dynamic liquid film, increasing the contact area between the liquid-phase and gas-phase materials, and greatly improving the space utilization rate inside the tower body 1; the overflow ring 4 is provided with a gap from the edge of the rotating tray 5, and the liquid phase enters the next tray 5 through the gap under the action of centrifugal force, eliminating the risk of flooding.

[0031] The jet assemblies 38 are evenly distributed on the tray 5 and are arranged in concentric circles. The jet assembly 38 includes a perforation 19 formed in the tray 5, an air inlet pipe 20 rotatably connected inside the perforation 19 and extending above the tray 5, a fixing ring 21 fixedly connected to the top end of the air inlet pipe 20, a floating ring 22 slidably connected to the air inlet pipe 20 and located below the fixing ring 21, and a plurality of jet members 23 circumferentially distributed around the floating ring 22. The top end of the air inlet pipe 20 is closed, and an axial limit 24 is provided between the air inlet pipe 20 and the perforation 19. The floating ring 22 and the outer wall of the air inlet pipe 20 are slidably connected through a spline 25, and circumferential limitation is performed between the floating ring 22 and the air inlet pipe 20.

[0032] The jetting direction of the jetting member 23 is along the chord tangent direction of the floating ring 22. A plurality of first connection holes 26 are formed in the fixed ring 21, and second connection holes 27 are formed in the floating ring 22. One end of the first connection hole 26 communicates with the inside of the intake pipe 20 and the other end communicates with the bottom end face of the fixed ring 21. One end of the second connection hole 27 communicates with the top end face of the floating ring 22 and the other end communicates with the jetting member 23. A connection hose 28 with two ends respectively communicating with the first connection hole 26 and the second connection hole 27 is provided between the fixed ring 21 and the floating ring 22. An elastic telescopic ring 29 is provided between the fixed ring 21 and the floating ring 22, and the connection hose 28 is located inside the elastic telescopic ring 29.

[0033] The jetting member 23 includes a connection shell 30 fixedly connected to the floating ring 22, a rotating column core 31 rotatably connected inside the connection shell 30, and jetting heads 32 arranged on the circumferential portion of the rotating column core 31. The connection shell 30 is in an arch shape. A first rotating groove 33 is formed on the side of the connection shell 30 away from the floating ring 22. The first rotating groove 33 extends in an arc shape along the edge of the connection shell 30. The jetting heads 32 pass through the first rotating groove 33 and extend to the outside of the connection shell 30. A chamfer is provided on one side edge of the rotating column core 31, and the jetting heads 32 are fixedly connected to the chamfered position, so that the jetting direction of the jetting heads 32 faces the chord tangent direction of the floating ring 22.

[0034] By arranging the jetting member 23 to jet high-speed air flow along the chord tangent direction of the floating ring 22, its jetting direction forms a cooperative swirling flow field with the rotation direction of the tray 5. On the one hand, the tangential air flow forms a rotating shear force on the liquid layer surface to disturb the liquid-phase material; on the other hand, the jet reaction force drives the intake pipe 20 to generate a self-rotation motion. This compound motion enables the gas phase to form a spiral rising bubble trajectory in the liquid phase, prolonging the gas-liquid contact time. The elastic telescopic ring 29 maintains the air path seal when the floating ring 22 floats up and down, ensuring stable air supply at different liquid levels, and enabling the ejected air flow to spread evenly in the liquid-phase material.

[0035] To enable the rotating column core 31 to automatically adjust the direction of the jetting heads 32 according to the liquid layer depth, a connection groove 34 is formed in the circumferential wall of the rotating column core 31 close to the second connection hole 27. The connection groove 34 communicates with the other end of the second connection hole 27. A third connection hole 35 with one end communicating with the connection groove 34 and the other end communicating with the jetting heads 32 is formed inside the rotating column core 31. A second rotating groove 36 is formed on one end face of the connection shell 30 close to the floating ring 22 and below the axis of the rotating column core 31. The second rotating groove 36 extends in an arc shape around the axis of the rotating column core 31. A floating block 37 fixedly connected to the end face of the rotating column core 31 passes through the second rotating groove 36 and extends to the outside of the connection shell 30.

[0036] By setting the rotating column core 31 to drive the jet head 32 to rotate, when the depth of the liquid-phase material on the tray 5 is large, the buoyancy pushes the floating block 37 to slide along the second rotating groove 36, driving the rotating column core 31 to rotate, so that the jet head 32 deflects downward. At this time, the air flow penetrates the bottom of the liquid layer at a diving angle, forming a dense bubble group in the high-pressure area. When the liquid level drops, the floating ring 22 moves downward under the action of gravity, and the jet head 32 resumes horizontal jetting at a small angle, forming an umbrella-shaped air flow with wide-area coverage, realizing automatic adjustment of the jet angle.

[0037] The implementation principle of the present invention is as follows: In the present invention, the driving assembly 13 drives the arc-shaped trays 5 of each layer to rotate synchronously, and under the action of centrifugal force, the liquid-phase material is evenly spread into a dynamic liquid film. A gap is formed between the edge of the rotating tray 5 and the overflow ring 4 to realize liquid centrifugal overflow while avoiding flooding. In the flow conversion assembly 2, the floating ring 22 drives the angle adjustment of the jet head 32 as the liquid level rises and falls: when at a low level, the jet head 32 jets horizontally to form an umbrella-shaped gas curtain, and when at a high level, it tilts downward to penetrate the liquid layer; the jet head 32 maintains the gas path connection through the connecting hose 28, and the elastic telescopic ring 29 compensates for the floating stroke. The inclined flow equalizing holes 11 of the flow equalizing plate 10 guide the gas phase to spiral upward during rotation. By enabling the gas-liquid two-phase to act under multiple actions such as rotational shear and swirl disturbance, the mass transfer interface is continuously updated, improving the utilization rate of the internal space of the tower body 1.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope claimed by the present invention. The scope claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A pyrrole nitrile purification device based on distillation technology, characterized in that: The invention comprises a tower body (1), a commutation assembly (2) arranged in the tower body (1), the commutation assembly (2) comprising an overflow ring (4) fixedly connected in the tower body (1), a tower plate (5) rotatably connected to the inner side of the overflow ring (4), and jet assemblies (38) uniformly distributed on the tower plate (5), the overflow ring (4) being an annular plate spaced apart from the inner wall of the tower body (1), a plurality of fixed plates (6) being fixedly connected between the overflow ring (4) and the tower body (1), the fixed plates (6) being arranged vertically, a rotating annular groove (8) being provided at the lower middle part of the inner side of the overflow ring (4), the outer edge of the tower plate (5) being rotatably connected in the rotating annular groove (8), the tower plate (5) being arranged as an arc-shaped plate concave downwardly, the commutation assemblies (2) being uniformly distributed on the tower plate (5), and a driving assembly (13) for driving a plurality of layers of tower plates (5) to rotate synchronously being provided on the outer side of the tower body (1).

2. The pyrrole nitrile purification device based on distillation technology according to claim 1, characterized in that: The jet assembly (38) comprises a through hole (19) provided in the tower plate (5), an air inlet pipe (20) rotatably connected to the through hole (19) and extending to the top of the tower plate (5), a fixed ring (21) fixedly connected to the top of the air inlet pipe (20), a floating ring (22) slidably connected to the air inlet pipe (20) and located below the fixed ring (21), and a plurality of jet components (23) uniformly distributed around the floating ring (22), wherein the jet direction of the jet components (23) is along the chord tangent direction of the floating ring (22), the top of the air inlet pipe (20) is closed, the fixed ring (21) is provided with a plurality of first connection holes (26), the floating ring (22) is provided with a plurality of first connection holes (26), and the floating ring (22) is provided with a plurality of first connection holes (26). A second connecting hole (27) is provided on (22), one end of the first connecting hole (26) is connected to the inside of the air inlet pipe (20) and the other end is connected to the bottom end face of the fixed ring (21), one end of the second connecting hole (27) is connected to the top end face of the floating ring (22) and the other end is connected to the injection part (23), a connecting hose (28) is provided between the fixed ring (21) and the floating ring (22), the two ends of the connecting hose (28) being connected to the first connecting hole (26) and the second connecting hole (27) respectively, an elastic telescopic ring (29) is provided between the fixed ring (21) and the floating ring (22), and the connecting hose (28) is located inside the elastic telescopic ring (29).

3. The pyrrole nitrile purification device based on distillation technology according to claim 2, characterized in that: The jet component (23) comprises a connecting shell (30) fixedly connected to the floating ring (22), a rotating column core (31) rotatably connected to the connecting shell (30), and a jet head (32) arranged on the periphery of the rotating column core (31); a first rotating groove (33) is provided on a side of the connecting shell (30) away from the floating ring (22); the first rotating groove (33) extends in an arc shape along the edge of the connecting shell (30); the jet head (32) passes through the first rotating groove (33) and extends to the outside of the connecting shell (30); a chamfer is provided on one edge of the rotating column core (31); the jet head (32) is fixedly connected to the chamfer; the rotating column core (31) is close to the second connecting shell (30); A connecting groove (34) is provided on the peripheral wall of the connecting hole (27), and the connecting groove (34) is connected to the other end of the second connecting hole (27). A third connecting hole (35) is provided inside the rotating column core (31), one end of which is connected to the connecting groove (34) and the other end of which is connected to the nozzle (32). A second rotating groove (36) is provided at a position close to the floating ring (22) and below the axis of the rotating column core (31) on one end surface of the connecting shell (30). The second rotating groove (36) extends in an arc shape around the axis of the rotating column core (31). A floating block (37) is fixedly connected to the end surface of the rotating column core (31) and passes through the second rotating groove (36) and extends to the outside of the connecting shell (30).

4. The pyrrole nitrile purification device based on distillation technology according to claim 3, characterized in that: The driving assembly (13) comprises a mounting shell (14) fixedly connected to the outer wall of the tower body (1) and extending along the length direction of the tower body (1), a driving shaft (15) rotatably connected to the mounting shell (14), a driving motor (16) connected to the bottom end of the driving shaft (15), and a driving gear (17) coaxially fixedly connected to the driving shaft (15) and corresponding to the tower plates (5) one by one, the outer edge of the tower plate (5) is fixedly connected to an outer toothed ring (9) rotatably connected to the rotating ring groove (8), the tower body (1) is provided with a through groove (18), one side of the driving gear (17) passes through the through groove (18) and meshes with the outer toothed ring (9).

5. The pyrrole nitrile purification device based on distillation technology according to claim 1, characterized in that: A guide plate (7) is provided above the overflow ring (4); the guide plate (7) is arranged in a ring shape around the tower body (1) and is fixedly connected to the inner wall of the tower body (1); the inner edge of the guide plate (7) is arranged to be closed toward the axis of the tower body (1); and the inner diameter of the guide plate (7) is not greater than the inner diameter of the overflow ring (4).

6. The pyrrole nitrile purification device based on distillation technology according to claim 1, characterized in that: A flow balancing plate (10) is provided at the bottom of the tower plate (5), and a flow balancing hole (11) is opened on the flow balancing plate (10). The flow balancing plate (10) is configured as an arc-shaped plate that matches the tower plate (5), and the top outer edge of the flow balancing plate (10) is connected to the tower plate (5) via a plurality of fixing rods (12).

7. The pyrrole nitrile purification device based on distillation technology according to claim 6, characterized in that: The flow balancing holes (11) are arranged obliquely along the rotation direction of the flow balancing plate (10).

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