Rectification and condensation device for production of N-vinyl pyrrolidone

Abstract

The utility model discloses a rectifying and condensing device for producing N-vinyl pyrrolidone, which comprises a rectifying tower, the rectifying tower is communicated with a feed pipe, a discharge pipe, a gas guide pipe, an exhaust pipe and a return pipe, tower plate groups are stacked in the rectifying tower in a staggered manner, and an overflow plate is arranged at the bottom of an inner cavity of the rectifying tower. According to the utility model, the defects in the prior art are overcome, the characteristics of liquid phase flow are utilized to drive a mechanical structure to move and clean the holes of the tower plate for gas phase circulation, the problem of unsmooth gas phase circulation caused by blockage of the holes of the tower plate is effectively avoided, and the device has higher social use value and application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical machinery, in particular to a rectification and condensation device for producing N-vinyl pyrrolidone. Background Art

[0002] N-vinyl pyrrolidone is an organic compound, referred to as N-VP. N-VP can be copolymerized with polymers such as polyacrylic acid and polyvinyl alcohol, making it widely used in different types of polymer materials such as cellulose, polyethylene, and polypropylene. N-VP has good solution stability and can exist stably in different solution systems such as water and organic solvents. In the production process of N-VP, it needs to be prepared through vinylation, flash evaporation, evaporation separation, and light distillation separation.

[0003] In the existing production process, when the sieve plate type distillation tower used for light fractionation is put into preparation and treatment, since the liquid phase and the gas phase contain certain impurities, these impurities are easily retained in the tower, which can easily cause the holes on the sieve plate to be blocked, causing the holes through which the gas phase passes to be blocked, affecting the circulation of the gas phase and causing insufficient gas-liquid contact.

[0004] Furthermore, in the initial stage of liquid phase circulation, the liquid phase will flow directly through the holes on the sieve plate, so that the liquid phase blocks the flow of the gas phase, resulting in incomplete contact between the liquid phase and the gas phase, causing leakage.

[0005] Therefore, in view of this, the inventor, based on his many years of rich experience in design, development and actual production in the relevant industry, has studied and improved the existing structure and deficiencies, and provided a distillation and condensation device for the production of N-vinyl pyrrolidone, in order to achieve a more practical purpose. Utility Model Content

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A rectification and condensation device for producing N-vinyl pyrrolidone, comprising a rectification tower, the rectification tower is connected with a feed pipe, a discharge pipe, an air guide pipe, an exhaust pipe and a reflux pipe, the rectification tower has a stack of plates stacked in a staggered manner, and an overflow plate is provided at the bottom of the inner cavity of the rectification tower;

[0008] The exhaust pipe and the reflux pipe are circulated and connected with a condenser, and the discharge pipe and the air guide pipe are circulated and connected with a reboiler.

[0009] Preferably, the tower plate group includes a sieve plate, a liquid collecting frame is provided at one end of the sieve plate, an overflow weir is provided at the other end of the sieve plate, and a liquid downcomer is provided on the sieve plate.

[0010] Preferably, a hole cleaning mechanism and a sleeve rod are provided on the bottom surface of the sieve plate, and the hole cleaning mechanism includes a reciprocating screw rod, and an impact impeller rotatably connected to the liquid drop plate is provided at the end of the reciprocating screw rod, and a transverse block is mounted on the reciprocating screw rod, and a transverse plate is provided on the transverse block, and adapter plates are provided at both ends of the transverse plate.

[0011] Preferably, a limiting groove is provided in the liquid collecting frame, a sealing plate is provided in the limiting groove, a connecting column is provided on the sealing plate, and a first limiting hole is provided in the limiting groove to provide guidance for the sealing plate.

[0012] Preferably, a liquid delivery channel is provided in the liquid collecting frame, and a leakage hole is provided on the overflow weir.

[0013] Preferably, the transverse plate and the adapter plate are both provided with brushes, and the transverse plate is provided with a buckle that is slidably mounted on the sleeve rod.

[0014] Preferably, a displacement groove for fitting the adapter plate is provided at the end of the transverse plate, and a slag cleaning port is provided on the displacement groove.

[0015] Preferably, a guide plate is provided on the bottom surface of the sieve plate, a guide groove is provided in the guide plate, and a guide wheel which is guided and fitted in the guide groove is provided on the adapter plate.

[0016] Preferably, a plate groove is provided on the sieve plate, a liquid blocking mechanism is installed in the plate groove, and a second limiting hole is also provided on the sieve plate;

[0017] The liquid blocking mechanism comprises a liquid blocking plate fitted with the plate groove, a balance plate fitted with the second limiting hole is arranged on the liquid blocking plate, and a dislocation groove slidingly matched with the connecting column is opened on the balance plate.

[0018] Preferably, a driving shaft threadedly mounted on the sealing plate is provided at the bottom of the liquid collecting frame, opposite thread grooves are provided on the driving shaft, and a driving motor installed on the outer wall of the distillation tower is connected to the end of the driving shaft.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. Through the setting of the hole cleaning mechanism and the cooperation between the impact impeller and the leakage hole, the liquid phase can flow out through the leakage hole to impact the impact impeller, so that the impact impeller rotates, so that the transverse block can drive the brushes fixed on the transverse plate and the adapter plate to clean the holes on the surface of the sieve plate, effectively avoiding the blockage of the holes on the surface of the sieve plate.

[0021] 2. By setting the horizontal plate and the adapter plate and utilizing the cooperation between the guide wheel and the guide groove, the relative position between the horizontal plate and the adapter plate can be adjusted to match the holes at different positions opened on the surface of the sieve plate.

[0022] 3. By opening the liquid delivery channel and utilizing the cooperation between the liquid blocking mechanism, the sealing plate and the connecting column, the liquid phase can flow through the liquid delivery channel in the initial stage until the liquid phase fills the liquid collecting frame and the overflow plate. When the gas phase flows evenly through the holes on the surface of the sieve plate, the direct contact between the liquid phase and the gas phase is more complete.

[0023] In summary, the utility model overcomes the shortcomings of the prior art, utilizes the characteristics of liquid flow to drive the movement of the mechanical structure, cleans the holes in the tower plates through which the gas phase flows, and effectively avoids the problem of poor gas circulation caused by blockage of the holes in the tower plates. It has high social use value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The overall structure connection diagram of the utility model is as follows

[0026] Figure 2 It is a structural schematic diagram of the distillation tower in the utility model;

[0027] Figure 3 This is a schematic diagram of the structural splicing of the tower plate group and the overflow plate in the utility model;

[0028] Figure 4 This is a schematic diagram of the structural splicing of the tower plate group and the hole cleaning mechanism in the utility model;

[0029] Figure 5 Based Figure 4 Schematic diagram of structural explosion;

[0030] Figure 6 It is a structural side cross-sectional view of the tower plate group in the utility model;

[0031] Figure 7 It is a top view of the structure of the tower plate group in the utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the hole cleaning mechanism in the utility model;

[0033] Fig. 9 This is a schematic diagram of the structural splicing of the horizontal plate and the adapter plate in the utility model;

[0034] Fig.10 This is a schematic diagram of the structural splicing of the liquid blocking mechanism and the sealing plate in the utility model;

[0035] Fig.11 It is a structural schematic diagram of the middle liquid blocking mechanism of the utility model;

[0036] Fig.12 It is a structural schematic diagram of the sealing plate in the utility model.

[0037] In the figure: 100, condenser; 200, reboiler; 1, distillation tower; 101, feed pipe; 102, discharge pipe; 103, air guide pipe; 104, exhaust pipe; 105, reflux pipe; 2, tower plate group; 21, limit groove; 211, drive shaft; 2111, opposite wire groove; 22, first limit hole; 23, second limit hole; 201, sieve plate; 2011, plate groove; 202, liquid collecting frame; 2021, liquid delivery channel; 203, overflow weir; 2031, leakage hole; 204 , liquid drop plate; 3, liquid blocking mechanism; 301, liquid blocking plate; 302, balance plate; 3021, offset groove; 4, sealing plate; 41, connecting column; 5, hole cleaning mechanism; 501, reciprocating screw; 502, transverse block; 503, transverse plate; 504, adapter plate; 5041, guide wheel; 505, impact impeller; 506, buckle; 507, brush; 51, displacement groove; 511, slag cleaning port; 6, sleeve rod; 7, guide plate; 71, guide groove; 8, drive motor; 9, overflow plate. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Example 1

[0040] Reference Figure 1-12 A distillation and condensation device for producing N-vinyl pyrrolidone, comprising a distillation tower 1, the distillation tower 1 is connected with a feed pipe 101, a discharge pipe 102, an air guide pipe 103, an exhaust pipe 104 and a reflux pipe 105, a plate group 2 is staggered and stacked in the distillation tower 1, and an overflow plate 9 is provided at the bottom of the inner cavity of the distillation tower 1;

[0041] The exhaust pipe 104 and the reflux pipe 105 are circulated in communication with the condenser 100 , and the discharge pipe 102 and the air guide pipe 103 are circulated in communication with the reboiler 200 .

[0042] Specifically, the tower plate group 2 includes a sieve plate 201, a liquid collecting frame 202 is provided at one end of the sieve plate 201, an overflow weir 203 is provided at the other end of the sieve plate 201, a liquid downcomer 204 is provided on the sieve plate 201, and holes for allowing the gas phase to pass through are opened on the sieve plate 201.

[0043] Specifically, the bottom surface of the sieve plate 201 is provided with a hole cleaning mechanism 5 and a sleeve rod 6, the hole cleaning mechanism 5 includes a reciprocating screw rod 501, the end of the reciprocating screw rod 501 is provided with an impact impeller 505 rotatably connected to the liquid drop plate 204, the reciprocating screw rod 501 is provided with a transverse block 502, the transverse block 502 is provided with a transverse plate 503, and both ends of the transverse plate 503 are provided with an adapter plate 504, and the impact impeller 505 is installed directly below the leak hole 2031, so that the material passes through the overflow When the weir 203 overflows, the material will fall through the leak hole 2031, causing the material to impact the impact impeller 505, causing the impact impeller 505 to rotate, thereby driving the reciprocating screw 501 to rotate, allowing the transverse block 502 to drive the transverse plate 503 to reciprocate, allowing the brush 507 to act on the bottom surface of the sieve plate 201 to clean the holes on the bottom surface of the sieve plate 201, thereby avoiding the phenomenon of poor gas passage due to blockage of the holes.

[0044] Specifically, a limiting groove 21 is provided in the liquid collecting frame 202, a sealing plate 4 is provided in the limiting groove 21, a connecting column 41 is provided on the sealing plate 4, a first limiting hole 22 is provided in the limiting groove 21 to provide guidance for the sealing plate 4, and the sealing plate 4 can move horizontally left and right inside the limiting groove 21. The opening of the first limiting hole 22 can connect the sealing plate 4 with the driving shaft 211, and the rotation of the driving shaft 211 cooperates with the threaded fitting between the opposing wire groove 2111 and the sealing plate 4, so that the sealing plate 4 can move horizontally left and right inside the limiting groove 21.

[0045] Specifically, a liquid delivery channel 2021 is opened in the liquid collecting frame 202, and a leakage hole 2031 is opened on the overflow weir 203. The opening of the liquid delivery channel 2021 can prevent the material flowing into the liquid collecting frame 202 from flowing into the liquid collecting frame 202 of the next layer through the sieve plate 201, the overflow weir 203 and the downcomer plate 204, and allow the material to flow directly into the liquid collecting frame 202 of the next layer through the liquid collecting frame 202 and the liquid delivery channel 2021, so that the liquid collecting frame 202 of each layer is evenly filled with materials, and the inside of the overflow plate 9 is also filled with materials. When the material overflows from the overflow plate 9 to the bottom of the inner cavity of the distillation tower 1, the inside of each layer of the liquid collecting frame 202 is evenly filled with materials, and each layer is filled with a consistent amount of materials.

[0046] Specifically, brushes 507 are provided on the transverse plate 503 and the adapter plate 504. The transverse plate 503 is provided with a buckle 506 that is slidably mounted on the sleeve rod 6. The setting of the sleeve rod 6 can cooperate with the buckle 506 to keep the transverse plate 503 stable during the reciprocating horizontal movement, allowing the brush 507 to act on the bottom hole of the sieve plate 201.

[0047] Specifically, a displacement groove 51 for mounting the adapter plate 504 is provided at the end of the transverse plate 503, and a slag cleaning port 511 is provided on the displacement groove 51. Through the setting of the displacement groove 51, the adapter plate 504 can be moved therein, so that the relative positions of the adapter plate 504 and the transverse plate 503 can be adapted and adjusted. The opening of the slag cleaning port 511 can squeeze out the material in the displacement groove 51 or the cleaned impurities.

[0048] Specifically, a guide plate 7 is provided on the bottom surface of the sieve plate 201, and a guide groove 71 is opened in the guide plate 7. A guide wheel 5041 which is guided and fitted with the guide groove 71 is provided on the adapter plate 504. Through the setting of the guide plate 7, the guide wheel 5041 can move inside the guide groove 71 to adjust the relative position between the adapter plate 504 and the cross plate 503, so that the adapter plate 504 and the cross plate 503 cooperate with each other to adapt and adjust the holes on the bottom surface of the sieve plate 201.

[0049] Example 2

[0050] Reference Figure 1-12 The difference between this embodiment and the embodiment 1 is that a plate groove 2011 is provided on the sieve plate 201, a liquid blocking mechanism 3 is installed in the plate groove 2011, and a second limiting hole 23 is also provided on the sieve plate 201;

[0051] The liquid retaining mechanism 3 includes a liquid retaining plate 301 fitted with the plate groove 2011, a balance plate 302 fitted with the second limiting hole 23 is provided on the liquid retaining plate 301, and a dislocation groove 3021 slidably matched with the connecting column 41 is opened on the balance plate 302. Through the opening of the plate groove 2011, the liquid retaining plate 301 can be embedded therein, and the liquid retaining plate 301 can be adjusted up and down therein to adjust the connection height between the liquid collecting frame 202 and the sieve plate 201. The lateral displacement position of the sealing plate 4 is used to adapt the connecting column 41 and the dislocation groove 3021. The height position of the liquid baffle plate 301 in the plate groove 2011 is adjusted by cooperating with each other. When the sealing plate 4 blocks the liquid delivery channel 2021, the liquid baffle plate 301 will be lowered, so that the material inside the liquid collecting frame 202 will no longer flow through the liquid delivery channel 2021, but will flow through the sieve plate 201. When the sealing plate 4 opens the liquid delivery channel 2021, the height of the liquid baffle plate 301 will rise, so that the material inside the liquid collecting frame 202 will flow into the liquid collecting frame 202 of the next layer through the liquid delivery channel 2021.

[0052] Specifically, a driving shaft 211 threadedly mounted on the sealing plate 4 is provided at the bottom end of the liquid collecting frame 202, and opposing wire grooves 2111 are opened on the driving shaft 211. The end of the driving shaft 211 is connected to a driving motor 8 installed on the outer wall of the distillation tower 1. Through the setting of the driving shaft 211, the driving motor 8 drives the driving shaft 211 to rotate, and through the connection between the opposing wire grooves 2111 and the sealing plate 4, the sealing plate 4 can be horizontally moved left and right inside the limiting groove 21, so as to complete the closing and opening of the liquid delivery channel 2021.

[0053] For other structures not described, refer to Example 1.

[0054] Working principle: In the present invention, the feed pipe 101 is first connected to the external feed pipe, so that the crude N-VP material can enter the interior of the distillation tower 1 through the feed pipe 101, and then the discharge pipe 102 is connected to the external feed pipe, and the discharge pipe 102 and the air guide pipe 103 are simultaneously connected to the reboiler 200 in a circulation manner, and the exhaust pipe 104 and the reflux pipe 105 are connected to the condenser 100 in a circulation manner, and the discharge end of the condenser 100 is connected to the external intermittent distillation tower, and the material processed by the distillation tower 1 is transported to the intermittent distillation tower connected to the outside for subsequent processing;

[0055] Before the equipment is started, the driving motor 8 installed on the outer wall of the distillation tower 1 is synchronously turned on, and the output shaft of the driving motor 8 drives the driving shaft 211 to rotate. Through the cooperation between the opposing wire groove 2111 and the sealing plate 4, the sealing plate 4 opens the channel of the liquid delivery channel 2021. At the same time, the height of the liquid baffle plate 301 is increased, so that the flow space of the liquid collecting frame 202 for the dry material is increased. The material entering the distillation tower 1 through the feed pipe 101 will flow into the liquid collecting frame 202, and then flow to the liquid collecting frame 202 of the next layer through the liquid delivery channel 2021, until the material in the liquid collecting frame 202 and the overflow plate 9 is full, and the material will enter the bottom of the inner cavity of the distillation tower 1;

[0056] Steam is introduced into the distillation tower 1 through the air guide pipe 103, so that the steam can pass through the holes on the surface of the sieve plate 201 to control the flow pressure of the steam;

[0057] Then, the driving motor 8 is synchronously turned on in the reverse direction, so that the sealing plate 4 blocks the liquid delivery channel 2021, so that the material in the liquid collecting frame 202 will no longer pass through the liquid delivery channel 2021. As the liquid delivery channel 2021 is closed, the height of the liquid blocking plate 301 is reduced, and the materials in each layer of the liquid collecting frame 202 will synchronously enter the sieve plate 201, so that the materials can stably contact with the steam.

[0058] When the material flows into the lower liquid collecting frame 202 through the overflow weir 203, part of the material will fall through the leakage hole 2031, and the gravity potential energy will be used to drive the impact impeller 505 to rotate, so that the reciprocating screw 501 can rotate synchronously, and the transverse block 502 can drive the transverse plate 503 and the adapter plate 504 to move back and forth, so that the brush 507 can clean the bottom surface of the sieve plate 201 to prevent the holes on the sieve plate 201 from being blocked and affecting the passage of steam. When the adapter plate 504 moves, the guide wheel 5041 and the guide groove 71 will cooperate to allow the relative position between the adapter plate 504 and the transverse plate 503 to be adapted and adjusted according to the shape of the bottom surface of the sieve plate 201.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A distillation and condensation device for producing N-vinyl pyrrolidone, comprising a distillation tower (1), characterized in that: The distillation tower (1) is connected to a feed pipe (101), a discharge pipe (102), an air guide pipe (103), an exhaust pipe (104) and a reflux pipe (105); a plate group (2) is stacked in an offset manner in the distillation tower (1); and an overflow plate (9) is provided at the bottom of the inner cavity of the distillation tower (1); The exhaust pipe (104) and the reflux pipe (105) are circulated in communication with a condenser (100), and the discharge pipe (102) and the air guide pipe (103) are circulated in communication with a reboiler (200); The tower plate group (2) comprises a sieve plate (201), one end of the sieve plate (201) is provided with a liquid collecting frame (202), the other end of the sieve plate (201) is provided with an overflow weir (203), and the sieve plate (201) is provided with a liquid downcomer (204); The bottom surface of the sieve plate (201) is provided with a hole cleaning mechanism (5) and a sleeve rod (6); the hole cleaning mechanism (5) comprises a reciprocating screw rod (501); an impact impeller (505) rotatably connected to the liquid dropper plate (204) is provided at the end of the reciprocating screw rod (501); a transverse block (502) is sleeved on the reciprocating screw rod (501); a transverse plate (503) is provided on the transverse block (502); and adapter plates (504) are provided at both ends of the transverse plate (503).

2. A distillation and condensation device for producing N-vinyl pyrrolidone according to claim 1, characterized in that: A limiting groove (21) is provided in the liquid collecting frame (202), a sealing plate (4) is provided in the limiting groove (21), a connecting column (41) is provided on the sealing plate (4), and a first limiting hole (22) is provided in the limiting groove (21) for providing guidance for the sealing plate (4).

3. A distillation and condensation device for producing N-vinyl pyrrolidone according to claim 1, characterized in that: A liquid delivery channel (2021) is provided in the liquid collecting frame (202), and a leakage hole (2031) is provided on the overflow weir (203).

4. A distillation and condensation device for producing N-vinyl pyrrolidone according to claim 1, characterized in that: The horizontal plate (503) and the adapter plate (504) are both provided with brushes (507), and the horizontal plate (503) is provided with a sleeve buckle (506) that is slidably mounted on the sleeve rod (6).

5. A distillation and condensation device for producing N-vinyl pyrrolidone according to claim 4, characterized in that: The end of the transverse plate (503) is provided with a displacement groove (51) for fitting the adapter plate (504), and the displacement groove (51) is provided with a slag cleaning port (511).

6. A distillation and condensation device for producing N-vinyl pyrrolidone according to claim 5, characterized in that: The bottom surface of the sieve plate (201) is provided with a guide plate (7), a guide groove (71) is provided in the guide plate (7), and the adapter plate (504) is provided with a guide wheel (5041) which is guided and sleeved with the guide groove (71).

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