Distillation tower for cyanopyridine production

Abstract

The present invention relates to the technical field of cyanopyridine production, and discloses a cyanopyridine production distillation tower, the cyanopyridine production distillation tower comprises a gas pipe communicating between the top of a cover and a tower plate, the gas pipe communicates with the cover through the tower plate and a float valve, the inner side of the top of a tower body is provided with a fluid driving assembly, and the fluid driving assembly comprises a shell and blades, and the shell is used for evenly distributing liquid to each blade, the gas-liquid contact area is increased, the gas-liquid contact time is prolonged, and the shell communicates with the backflow pipe. Through the arrangement of the float valve and the driving assembly, liquid flows back to the top of the tower body through the return pipe, is driven by the fluid driving assembly to operate, is scattered by the fluid driving assembly, and is uniformly distributed to each blade to form a thin liquid layer, so that the gas-liquid contact area is increased, the gas-liquid contact time is prolonged, and the gas-liquid separation efficiency is improved. In the rising process of the steam, when the quantity of the steam is small, the float valves seal the tower plates, so that the steam stays on the next layer of tower plate for a long time, and the gas-liquid reaction time is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cyanopyridine production, in particular to a distillation tower for cyanopyridine production. Background Art

[0002] In the production process of cyanopyridine, the distillation tower is a key equipment used to separate and purify cyanopyridine.

[0003] The Chinese patent application with application number CN201010516027.8 discloses a distillation tower, comprising a tower body, wherein the tower body is composed of an upper tower body and a lower tower body; the upper tower body is provided with a vacuum pipe opening and an oil inlet pipe; the lower tower body is provided with an oil outlet pipe and a lifting lug, and the tower body is provided with a packing rack and an oil distribution plate; a lower packing is provided above the packing rack, and an injection device is provided below the packing rack; the oil distribution plate is fixed to the tower body through the lifting lug; the injection device includes a steam inlet pipe and a direct steam injection pipe; an upper packing is provided at the vacuum pipe opening inside the tower body; The oil enters the tower body through the oil inlet pipe of the upper tower body. The diameter of the oil inlet pipe is smaller than that of the upper tower body. There is a certain oil pressure when entering. At this time, the oil enters the tower body in a concentrated manner and flows at a faster speed. The reaction time between the gas and the oil in the upper tower body is short. The oil is too concentrated, and the gas reacts with the outer layer of the oil first, and reacts with the inner layer of the oil more slowly, which will affect the reaction effect. Summary of the invention

[0004] The object of the present invention is to provide a distillation tower for producing cyanopyridine to solve the problems mentioned above in the background technology.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a distillation tower for producing cyanopyridine, comprising a tower body, the bottom of which is connected to a heater for providing steam to the inside of the tower body; The outer wall of the tower body is connected with a feed pipe; The bottom outer wall of the tower body is connected with a discharge pipe, and the discharge pipe and the heater are symmetrically arranged on the outer wall of the tower body; The top of the tower body is provided with an air outlet pipe and a return pipe, the air outlet pipe is connected to the top of the tower body, and the return pipe is connected to the outer side wall of the top of the tower body; A plurality of coolers are connected between one end of the discharge pipe and one end of the return pipe, and the air outlet pipe is connected to the return pipe through the cooler; Three tower plates are installed inside the tower body, and the three tower plates divide the inside of the tower body into four layers; Each of the tower plates is provided with a cover and a float valve, and a plurality of flow slots are provided on the outer wall of the cover; The float valve is located inside the cover and is suitable for changes in different steam quantities; An air pipe is connected between the top of the cover and the tower plate, and the air pipe is connected to the cover through the tower plate and the float valve; A fluid drive assembly is installed on the inner side of the top of the tower body. The fluid drive assembly includes a shell and blades, which are used to evenly distribute the liquid to each blade to form a thin liquid layer, increase the contact area and contact time between gas and liquid, and the shell is connected to the reflux pipe.

[0006] The purpose of the above arrangement is that the heater heats the liquid mixture. When the liquid mixture is heated, the component with a lower boiling point evaporates first and is converted into steam during the evaporation process. The steam enters the interior of the tower body and rises. The liquid is added through the feed pipe, flows out through the discharge pipe, is cooled by the condenser, and flows back to the top of the tower through the reflux pipe. The liquid is broken up by the operation of the fluid drive component, and the liquid is evenly distributed to each blade to form a thin liquid layer, thereby increasing the contact area and contact time between gas and liquid. During the rising process of steam, when the amount of steam is small, the float valve closes the tower plate, allowing the steam to stay on the next tower plate for a long time to increase the gas-liquid reaction time. When the amount of steam is large, the float valve is opened to allow the steam to contact the liquid on the tower plate through the circulation groove for distillation.

[0007] Furthermore, a gap is left between one end of the tower plate and the inner wall of the tower body, and the gaps between each tower plate and the tower body are staggered with each other.

[0008] The purpose of the above arrangement is that the liquid flowing out of the fluid driving component flows from top to bottom and passes through three tower plates in sequence for distillation.

[0009] Furthermore, one end of the tower plate close to the gap is configured to be L-shaped, and the head height of the L-shape is two-thirds of the height of the circulation slot.

[0010] The purpose of the above setting is that when the liquid on the upper surface of the tower plate overflows the L-shaped head, the liquid flows to the gap and falls to the next tower plate. The height of the L-shaped head is two-thirds of the height of the circulation groove, and the remaining one-third is used for steam circulation to allow gas and liquid to interact.

[0011] Furthermore, the lower surface and the upper surface of the tower plate are respectively provided with a lower groove and an upper groove.

[0012] The purpose of the above setting is that the upper groove retains liquid, the steam is in a continuously rising state, a part of the steam retains inside the lower groove, the thickness between the upper groove and the lower groove is thinner, and the gas-liquid residence time is longer, the heat of the steam is transferred to the liquid through the tower plate, thereby increasing the distillation time and improving efficiency.

[0013] Furthermore, the float valve includes a valve body, the bottom of which is connected to the air pipe through a tower plate, and two sliding grooves are arranged on the outer wall of the float valve, and a valve plate for opening and closing the top port of the valve body is slidably connected between the two sliding grooves.

[0014] The purpose of the above arrangement is that when the amount of steam is enough to lift the valve plate, the steam passes through the sliding groove and the top port of the valve body and enters the interior of the cover.

[0015] Furthermore, the bottom of the sliding groove of the valve body is higher than the top of the circulation groove.

[0016] The purpose of the above arrangement is to prevent the liquid from overflowing the sliding groove, entering the interior of the float valve, and affecting the rising of the steam.

[0017] Furthermore, a plurality of air holes are connected on the outer wall of the air pipe, and a spiral rod is installed on the inner wall of the air pipe.

[0018] The purpose of the above-mentioned setting is that when the steam rises, the steam is more concentrated above through the air pipe, and at the same time a small amount of steam flows out through the air holes to flow to the lower groove. A spiral rod is arranged inside the air pipe, and the steam passes through the spiral rod. When the gas flows on the upper spiral rod, it will be restricted and guided by the wall surface, generating centripetal force, thereby accelerating the flow of the gas, reducing turbulence and energy loss during the gas flow process, and improving the efficiency of gas transportation.

[0019] Furthermore, a short tube is provided on the top of the cover, and the diameter of the short tube is smaller than the diameter of the trachea.

[0020] The purpose of the above arrangement is that when the steam enters the interior of the hood through the float valve, the diameter of the short tube is smaller than the diameter of the air pipe, so that most of the steam stays inside the hood and passes through the circulation groove to increase the gas-liquid contact time. Subsequent steam replenishment will continue to heat up, thereby improving the distillation efficiency, and the remaining steam continues to rise through the short tube.

[0021] Furthermore, the fluid drive component also includes a rotating ring and a connecting frame, a mounting groove is provided on the inner wall of the shell, the rotating ring is rotatably connected to the mounting groove, a plurality of blades are installed on the upper surface of the rotating ring, and the plurality of blades are arranged at an angle, the middle part of the rotating ring is arranged to be hollow, the connecting frame is installed on the inner wall of the rotating ring, a connecting shaft is installed in the middle part of the connecting frame, and the plurality of blades are installed on the outer wall of the connecting shaft.

[0022] The purpose of the above arrangement is that the liquid in the reflux pipe enters the interior of the shell, and the blades are arranged at an angle. When the liquid flows in, the blades are pushed, driving the rotating ring to rotate, and then fall onto the blades through the hollow part of the rotating ring. The rotating ring drives several blades to rotate through the connecting frame and the connecting shaft. Several blades are slightly inclined on the connecting shaft. When the liquid falls onto the blades, the blades rotate to generate centrifugal force, and the liquid is dispersed to each blade and passes through the gap between each blade. At the same time, the steam rises. The liquid dispersion facilitates increasing the contact area and contact time between gas and liquid, thereby improving the reaction efficiency.

[0023] Furthermore, the shell has a smaller diameter than the tower plate and is located above the top tower plate.

[0024] The purpose of the above arrangement is to allow the dispersed liquid to fall onto the top tray.

[0025] The present invention has the following beneficial effects: (1) The present invention heats the liquid mixture by setting a float valve and a drive assembly. When the liquid mixture is heated, the component with a lower boiling point evaporates first and is converted into steam during the evaporation process. The steam enters the interior of the tower body and rises. The liquid is added through the feed pipe, flows out through the discharge pipe, is cooled by the condenser, flows back to the top of the tower through the reflux pipe, and is driven by the fluid drive component to operate. The fluid drive component breaks up the liquid and evenly distributes it to each blade to form a thin liquid layer, thereby increasing the contact area and contact time between gas and liquid. During the rising process of steam, when the amount of steam is small, the float valve closes the tower plate, allowing the steam to stay on the next tower plate for a long time to increase the gas-liquid reaction time. When the amount of steam is large, the float valve is opened, and the steam passes through the circulation groove and contacts the liquid on the tower plate for distillation.

[0026] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal plane structure of the present invention; Figure 3It is a schematic diagram of the internal structure of the present invention; Figure 4 It is a schematic diagram of the fluid drive assembly of the present invention; Figure 5 This is a schematic diagram of the planar structure of the tower plate and the gas pipe of the present invention; Figure 6 It is a schematic diagram of the cover and trachea structure of the present invention; Figure 7 It is a schematic diagram of the internal structure of the hood and the trachea of ​​the present invention; Figure 8 This is a schematic diagram of the structure of the float valve of the present invention; Fig. 9 For the present invention Figure 2 The structural diagram at A in the middle; Fig.10 It is a schematic diagram of the fluid drive assembly of the present invention; In the accompanying drawings, the components represented by the reference numerals are listed as follows: In the figure: 1. tower body; 101. feed pipe; 102. outlet pipe; 103. reflux pipe; 104. discharge pipe; 2. heater; 3. tower plate; 301. lower groove; 302. upper groove; 4. fluid drive assembly; 401. shell; 402. rotating ring; 403. connecting frame; 404. blade; 405. blade; 5. cover; 501. flow slot; 502. short tube; 6. air pipe; 601. air hole; 7. screw rod; 8. float valve; 801. valve body; 802. valve plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0030] The present invention is a distillation tower for producing cyanopyridine, such as Figure 1-Figure 10 As shown, it comprises a tower body 1, the bottom of the tower body 1 is connected to a heater 2 for providing steam to the inside of the tower body 1; The outer wall of the tower body 1 is connected with a feed pipe 101; The bottom outer wall of the tower body 1 is connected with a discharge pipe 104, and the discharge pipe 104 and the heater 2 are symmetrically arranged on the outer wall of the tower body 1; An air outlet pipe 102 and a return pipe 103 are provided at the top of the tower body 1. The air outlet pipe 102 is connected to the top of the tower body 1, and the return pipe 103 is connected to the top outer side wall of the tower body 1. A plurality of coolers are connected between one end of the discharge pipe 104 and one end of the return pipe 103, and the gas outlet pipe 102 is connected to the return pipe 103 through the cooler; Three tower plates 3 are installed inside the tower body 1, and the three tower plates 3 divide the interior of the tower body 1 into four layers; Each tray 3 is provided with a cover 5 and a float valve 8, and the outer wall of the cover 5 is provided with a plurality of flow slots 501; The float valve 8 is located inside the cover 5 and is suitable for the change of different steam quantities; An air pipe 6 is connected between the top of the cover 5 and the tower plate 3, and the air pipe 6 is connected to the cover 5 through the tower plate 3 and the float valve 8; A fluid drive assembly 4 is installed on the inner side of the top of the tower body 1. The fluid drive assembly 4 includes a shell 401 and blades 405, which are used to evenly distribute the liquid to each blade 405 to form a thin liquid layer, increase the contact area and contact time between gas and liquid, and the shell 401 is connected to the reflux pipe 103.

[0031] In this embodiment, the purpose of the above arrangement is that the heater 2 heats the liquid mixture. When the liquid mixture is heated, the component with a lower boiling point evaporates first and is converted into steam during the evaporation process. The steam enters the interior of the tower body 1 and rises. The liquid is added through the feed pipe 101, flows out through the discharge pipe 104, is cooled through the condenser, and flows back to the top of the tower body 1 through the reflux pipe 103. The liquid is broken up by the operation of the fluid drive component 4, and the liquid is evenly distributed on each blade 405 to form a thin liquid layer, thereby increasing the contact area and contact time between gas and liquid; During the rising process of steam, when the amount of steam is small, the float valve 8 closes the tower plate 3, allowing the steam to stay on the next tower plate 3 for a long time to increase the gas-liquid reaction time. When the amount of steam is large, the float valve 8 is opened to contact the liquid on the tower plate 3 through the circulation groove 501 for distillation.

[0032] As an implementation method, Figure 2 As shown, further: A gap is left between one end of the tower plate 3 and the inner wall of the tower body 1 , and the gaps between each tower plate 3 and the tower body 1 are staggered with each other.

[0033] In this embodiment, the purpose of the above arrangement is that the liquid flowing out of the fluid driving component 4 flows from top to bottom and passes through three tower plates 3 in sequence for distillation.

[0034] As an implementation method, Fig. 9 As shown, further: One end of the tower plate 3 close to the gap is configured to be L-shaped, and the height of the head of the L-shape is two-thirds of the height of the flow slot 501 .

[0035] In this embodiment, the purpose of the above arrangement is that when the liquid on the upper surface of the tower plate 3 overflows the L-shaped head, the liquid flows to the gap and falls to the next tower plate 3. The height of the L-shaped head is two-thirds of the height of the circulation groove 501, and the remaining one-third is used for steam circulation to allow gas and liquid to interact.

[0036] As an implementation method, Fig. 9 As shown, further: The lower surface and upper surface of the tower plate 3 are respectively provided with a lower groove 301 and an upper groove 302 .

[0037] In this embodiment, the purpose of the above-mentioned setting is that the upper groove 302 retains liquid, the steam is in a continuously rising state, a part of the steam retains inside the lower groove 301, the thickness between the upper groove 302 and the lower groove 301 is thin, and the gas-liquid residence time is long, and the heat of the steam is transferred to the liquid through the tower plate 3, thereby increasing the distillation time and improving the efficiency.

[0038] As an implementation method, Figure 8 As shown, further: The float valve 8 includes a valve body 801 , the bottom of which is connected to the air pipe 6 via the tower plate 3 , and two sliding grooves are arranged on the outer wall of the float valve 8 , between which a valve plate 802 for opening and closing the top port of the valve body 801 is slidably connected.

[0039] In this embodiment, the purpose of the above arrangement is that when the amount of steam can lift up the valve plate 802 , the steam passes through the sliding groove and the top port of the valve body 801 and enters into the interior of the cover 5 .

[0040] As an implementation method, Figure 7 As shown, further: The bottom of the sliding groove of the valve body 801 is higher than the top of the circulation groove 501 .

[0041] In this embodiment, the purpose of the above arrangement is to prevent the liquid from overflowing the sliding groove and entering the interior of the float valve 8 to affect the rising of the steam.

[0042] As an implementation method, Figure 7 As shown, further: The outer wall of the air pipe 6 is connected with a plurality of air holes 601 , and the inner wall of the air pipe 6 is provided with a spiral rod 7 .

[0043] In this embodiment, the purpose of the above-mentioned arrangement is that when the steam rises, the steam is more concentrated on the top through the air pipe 6, and at the same time a small amount of steam flows out through the air hole 601 to flow to the lower groove 301. A spiral rod 7 is arranged inside the air pipe 6. When the steam passes through the spiral rod 7, the gas will be restricted and guided by the wall when flowing on the upper spiral rod 7, generating centripetal force, thereby accelerating the flow of the gas, reducing turbulence and energy loss during the gas flow process, and improving the efficiency of gas transportation.

[0044] As an implementation method, Figure 7 As shown, further: A short tube 502 is provided on the top of the cover 5 , and the diameter of the short tube 502 is smaller than the diameter of the air pipe 6 .

[0045] In this embodiment, the purpose of the above-mentioned arrangement is that when the steam enters the interior of the cover 5 through the float valve 8, the diameter of the short tube 502 is smaller than the diameter of the air pipe 6, so that most of the steam stays in the interior of the cover 5 and passes through the circulation groove 501 to increase the gas-liquid contact time. Subsequent steam replenishment will continuously heat up, thereby improving the distillation efficiency, and the remaining steam continues to rise through the short tube 502.

[0046] As an implementation method, Figure 4 and Fig.10 As shown, further: The fluid drive component 4 also includes a rotating ring 402 and a connecting frame 403. A mounting groove is provided on the inner wall of the shell 401. The rotating ring 402 is rotatably connected to the mounting groove. A plurality of blades 404 are installed on the upper surface of the rotating ring 402. The plurality of blades 404 are inclined. The middle part of the rotating ring 402 is hollow. The connecting frame 403 is installed on the inner wall of the rotating ring 402. A connecting shaft is installed in the middle part of the connecting frame 403. A plurality of blades 405 are installed on the outer wall of the connecting shaft.

[0047] In this embodiment, the purpose of the above-mentioned arrangement is that the liquid in the reflux pipe 103 enters the interior of the shell 401, and the blade 404 is arranged at an angle. When the liquid flows in, the blade 404 is pushed, driving the rotating ring 402 to rotate, and then falls onto the blade 405 through the hollow part of the rotating ring 402. The rotating ring 402 drives a plurality of blades 405 to rotate through the connecting frame 403 and the connecting shaft. The plurality of blades 405 are slightly inclined on the connecting shaft. When the liquid falls onto the blade 405, the blade 405 rotates to generate centrifugal force, and the liquid is dispersed onto each blade 405 and passes through the gap between each blade 405. At the same time, the steam rises. The liquid dispersion facilitates increasing the contact area and contact time between gas and liquid, thereby improving the reaction efficiency.

[0048] As an implementation method, Figure 2 As shown, further: The shell 401 has a smaller diameter than the tower plate 3 and is located above the top tower plate 3 .

[0049] In this embodiment, the purpose of the above arrangement is to allow the dispersed liquid to fall onto the top tray 3 .

[0050] When in use, the heater 2 heats the liquid mixture. When the liquid mixture is heated, the component with a lower boiling point evaporates first and is converted into steam during the evaporation process. The steam enters the interior of the tower body 1 and rises. The liquid is added through the feed pipe 101, flows out through the discharge pipe 104, is cooled by the condenser, and flows back to the top of the tower body 1 through the reflux pipe 103. The liquid in the reflux pipe 103 enters the interior of the shell 401. The blade 404 is inclined. When the liquid flows in, the blade 404 is pushed to drive the rotating ring 402 to rotate, and then falls onto the blade 405 through the hollow part of the rotating ring 402. The rotating ring 402 drives a plurality of blades 405 to rotate through the connecting frame 403 and the connecting shaft. The plurality of blades 405 are slightly inclined on the connecting shaft. When the liquid falls onto the blade 405, the blade 405 rotates to generate centrifugal force, and the liquid is dispersed on each blade 405. The liquid passes through the gap between each blade 405, and the steam rises at the same time. The liquid dispersion is convenient for increasing the contact area and contact time of gas and liquid, thereby improving the reaction efficiency. During the rising process of steam, when the amount of steam is small, the float valve 8 closes the tower plate 3, allowing the steam to stay on the next tower plate 3 for a long time to increase the gas-liquid reaction time. When the amount of steam is large, the float valve 8 is opened, and the steam contacts the liquid on the tower plate 3 through the flow slot 501 for distillation. In this process, when the liquid on the upper surface of the tray 3 overflows the L-shaped head, the liquid flows to the gap and falls to the next tray 3. The height of the L-shaped head is two-thirds of the height of the flow groove 501, and the remaining one-third is used for steam circulation, allowing gas and liquid to interact. The upper groove 302 retains liquid, and the steam is in a state of continuous rise. A part of the steam is retained inside the lower groove 301. The thickness between the upper groove 302 and the lower groove 301 is thin, and the gas-liquid retention time is long. The heat of the steam is transferred to the liquid through the tray 3, which increases the distillation time and improves the efficiency. When the amount of steam can lift the valve plate 802, the steam passes through the sliding groove and the top port of the valve body 801 and enters the interior of the cover 5, preventing the liquid from overflowing the sliding groove and entering the interior of the float valve 8, thereby affecting the steam rising; When the steam rises, the steam is concentrated on the upper part through the air pipe 6, and a small part of the steam flows out through the air hole 601 to flow to the lower groove 301. The air pipe 6 is provided with a spiral rod 7 inside. When the steam passes through the spiral rod 7, the gas is restricted and guided by the wall when flowing on the upper spiral rod 7, generating a centripetal force, thereby accelerating the flow of the gas, reducing turbulence and energy loss during the gas flow process, and improving the efficiency of gas transportation; When the steam enters the interior of the cover 5 through the float valve 8, the diameter of the short tube 502 is smaller than the diameter of the air pipe 6, so that most of the steam stays in the interior of the cover 5 and passes through the circulation groove 501 to increase the gas-liquid contact time. Subsequent steam replenishment will continue to heat up, thereby improving the distillation efficiency, and the remaining steam continues to rise through the short tube 502.

[0051] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A distillation tower for producing cyanopyridine, comprising a tower body (1), characterized in that: The bottom of the tower body (1) is connected to a heater (2) for providing steam to the interior of the tower body (1); The outer wall of the tower body (1) is connected to a feed pipe (101); The bottom outer wall of the tower body (1) is connected to a discharge pipe (104), and the discharge pipe (104) and the heater (2) are symmetrically arranged on the outer wall of the tower body (1); An air outlet pipe (102) and a return pipe (103) are provided at the top of the tower body (1); the air outlet pipe (102) is connected to the top of the tower body (1), and the return pipe (103) is connected to the outer side wall of the top of the tower body (1); A plurality of coolers are connected between one end of the discharge pipe (104) and one end of the return pipe (103), and the air outlet pipe (102) is connected to the return pipe (103) through the cooler; Three tower plates (3) are installed inside the tower body (1), and the three tower plates (3) divide the interior of the tower body (1) into four layers; Each of the tower plates (3) is provided with a cover (5) and a float valve (8), and a plurality of flow slots (501) are provided on the outer wall of the cover (5); The float valve (8) is located on the inner side of the cover (5) and is suitable for changes in different steam quantities; An air pipe (6) is connected between the top of the cover (5) and the tower plate (3), and the air pipe (6) is connected to the cover (5) through the tower plate (3) and the float valve (8); A fluid drive assembly (4) is installed on the inner side of the top of the tower body (1). The fluid drive assembly (4) comprises a shell (401) and blades (405) and is used to evenly distribute liquid to each blade (405) to form a thin liquid layer, thereby increasing the contact area and contact time between gas and liquid. The shell (401) is connected to a reflux pipe (103).

2. A distillation tower for producing cyanopyridine according to claim 1, characterized in that: A gap is left between one end of the tower plate (3) and the inner wall of the tower body (1), and the gaps between each tower plate (3) and the tower body (1) are staggered with each other.

3. A distillation tower for producing cyanopyridine according to claim 1, characterized in that: The end of the tower plate (3) close to the gap is configured to be L-shaped, and the height of the head of the L-shape is two-thirds of the height of the circulation slot (501).

4. A distillation tower for producing cyanopyridine according to claim 1, characterized in that: The lower surface and upper surface of the tower plate (3) are respectively provided with a lower groove (301) and an upper groove (302).

5. A distillation tower for producing cyanopyridine according to claim 1, characterized in that: The float valve (8) comprises a valve body (801), the bottom of the valve body (801) being connected to the air pipe (6) via a tower plate (3), two sliding grooves being arranged on the outer wall of the float valve (8), a valve plate (802) for opening and closing the top port of the valve body (801) being slidably connected between the two sliding grooves.

6. A distillation tower for producing cyanopyridine according to claim 5, characterized in that: The bottom of the sliding groove of the valve body (801) is higher than the top of the circulation groove (501).

7. A distillation tower for producing cyanopyridine according to claim 1, characterized in that: The outer wall of the air pipe (6) is connected to a plurality of air holes (601), and the inner wall of the air pipe (6) is provided with a spiral rod (7).

8. A distillation tower for producing cyanopyridine according to claim 1, characterized in that: A short tube (502) is provided on the top of the cover (5), and the caliber of the short tube (502) is smaller than the caliber of the air pipe (6).

9. A distillation tower for producing cyanopyridine according to claim 1, characterized in that: The fluid drive assembly (4) further comprises a rotating ring (402) and a connecting frame (403); a mounting groove is provided on the inner wall of the housing (401); the rotating ring (402) is rotatably connected to the mounting groove; a plurality of blades (404) are mounted on the upper surface of the rotating ring (402); the plurality of blades (404) are arranged in an inclined manner; the middle portion of the rotating ring (402) is arranged to be hollow; the connecting frame (403) is mounted on the inner wall of the rotating ring (402); a connecting shaft is mounted on the middle portion of the connecting frame (403); and the plurality of blades (405) are mounted on the outer wall of the connecting shaft.

10. The distillation tower for producing cyanopyridine according to claim 1, characterized in that: The shell (401) has a smaller diameter than the tower plate (3) and is located above the top tower plate (3).

Images