Dehydration device for anhydrous acetonitrile production

Abstract

The utility model discloses a dehydration device for producing anhydrous acetonitrile. The dehydration device comprises a dehydration tank I and a dehydration tank II, the side face of the first dewatering tank is communicated with a first feeding pipe, the side face of the second dewatering tank is communicated with a second feeding pipe, and the ends, close to each other, of the first feeding pipe and the second feeding pipe are communicated with a main feeding pipe. The bottom of the first dehydration tank is communicated with a first discharging pipe, the bottom of the second dehydration tank is communicated with a second discharging pipe, and a discharging port of the first discharging pipe and a discharging port of the second discharging pipe are communicated with a connecting pipe. When the molecular sieve in one dehydration tank needs to be replaced, the other dehydration tank can be used for dehydration operation, the two dehydration tanks do not interfere with each other, and the molecular sieve in any dehydration tank can be replaced under the condition of no shutdown, so that the dehydration efficiency of acetonitrile is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of anhydrous acetonitrile production equipment, specifically a dehydration device for anhydrous acetonitrile production. Background Technology

[0002] Anhydrous acetonitrile requires dehydration during production. As described in Chinese patent application CN202321060861.X, a dehydration device for anhydrous acetonitrile, it includes: "A base, a box on top of the base with an inlet at the top, a raw material tank fixedly installed on the outside of the box, and a second pipe at the bottom of the box. One end of the raw material tank is connected to the inlet, and the other end is connected to the second pipe. A frame is installed on top of the box, and a first motor is fixedly installed inside the frame. This invention has a reasonable structure. Acetonitrile flows into the dehydration tank through the inlet via a first valve. The water in the acetonitrile is fully adsorbed by the molecular sieve inside the dehydration tank, achieving dehydration. This prevents acetonitrile backflow and facilitates dehydration, making it easier to treat residual acetonitrile in the pipes and improving dehydration efficiency."

[0003] Through the search of the above technologies, we found that molecular sieves are required in the acetonitrile dehydration process. Since the service life of molecular sieves is limited, they need to be replaced after a period of use. However, current technologies usually require the machine to be shut down when replacing molecular sieves, which means that the acetonitrile dehydration operation needs to be paused, thereby reducing the dehydration efficiency of acetonitrile. Moreover, the replacement of molecular sieves is affected by the feed inlet at the top of the dehydration tank and the connecting pipes, making the replacement of molecular sieves difficult. This results in problems of cumbersome operation and low replacement efficiency. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dehydration device for anhydrous acetonitrile production, comprising a dehydration tank 1 and a dehydration tank 2; a feed pipe 1 is connected to the side of the dehydration tank 1, and a feed pipe 2 is connected to the side of the dehydration tank 2; a main feed pipe is connected to the ends of the feed pipes 1 and 2 that are close to each other; a discharge pipe 1 is connected to the bottom of the dehydration tank 1, and a discharge pipe 2 is connected to the bottom of the dehydration tank 2; a connecting pipe connects the discharge port of the discharge pipe 1 and the discharge port of the discharge pipe 2; a sealing cover is sealed to the top of both the dehydration tank 1 and the dehydration tank 2; a dehydration assembly is provided inside both the dehydration tank 1 and the dehydration tank 2; the dehydration assembly includes a molecular sieve and a distribution plate with an internal hollow structure, the molecular sieve being located below the distribution plate.

[0006] As a further embodiment of this utility model: valve three is installed on the main feed pipe, valve one is installed on the feed pipe one, valve two is installed on the feed pipe two, valve four is installed on the connecting pipe at a position away from the discharge pipe two, and valve five is installed on the discharge pipe two.

[0007] As a further embodiment of this utility model: both the first dehydration tank and the second dehydration tank have positioning grooves on their inner walls, and each positioning groove has a molecular sieve on its inner bottom wall. The molecular sieve has through holes evenly distributed on its inner bottom wall, and handles are fixed on both sides of the top of the molecular sieve. The top of the handles is in close contact with the bottom of the diversion plate.

[0008] As a further embodiment of this utility model: the inner walls of the first dehydration tank and the second dehydration tank are fixed with a support ring in an annular shape at the top of the positioning groove. Each support ring is supported by a diverter plate. A connecting pipe is fixedly connected to one side of the diverter plate. A positioning sleeve is fitted on the pipe body of the connecting pipe. Perforations are evenly opened at the bottom of the diverter plate.

[0009] As a further embodiment of this utility model: the diversion plate in the first dehydration tank is connected to the second feed pipe through a connecting pipe, and the diversion plate in the second dehydration tank is connected to the first feed pipe through a connecting pipe. Both the first feed pipe and the second feed pipe are provided with sealing rings on their inner walls.

[0010] As a further embodiment of this utility model: the two sealing caps are respectively connected to the top of the first dehydration tank and the second dehydration tank by means of threaded connection, and a rubber sealing ring is provided at the bottom of each sealing cap. A pressure plate is fixed at the bottom of each sealing cap, and the bottom of the pressure plate is tightly attached to the top of the diverter plate.

[0011] As a further embodiment of this utility model: the bottom of the inner cavity of both the first dehydration tank and the second dehydration tank is designed in the shape of a funnel, the main feed pipe is used for introducing raw materials, and the connecting pipe is used for discharging materials after dehydration.

[0012] As a further embodiment of this utility model: the first dehydration tank and the second dehydration tank are connected together by a fixing frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] I. In this application, through the designed dehydration tank 1, dehydration tank 2, main feed pipe, feed pipe 1, feed pipe 2, discharge pipe 1, connecting pipe, discharge pipe 2, and dehydration components, the acetonitrile can be effectively dehydrated by cooperating with dehydration tank 1 and dehydration tank 2. When it is necessary to replace the molecular sieve in one of the dehydration tanks, the other dehydration tank can be used for dehydration. The two dehydration tanks do not interfere with each other, and the molecular sieve in either dehydration tank can be replaced without stopping the machine, thereby ensuring the dehydration efficiency of acetonitrile.

[0015] Second, in this application, by setting the feed pipe 1 of dehydration tank 1 and the feed pipe 2 of dehydration tank 2 on the side wall of the tank body respectively, it is possible to ensure that the sealing cover is not connected to the pipe. This ensures that when the sealing cover is removed to replace the molecular sieve, the movement of the sealing cover is not restricted by the pipe connection. This makes it convenient to remove the sealing cover from the tank body and quickly replace the molecular sieve. The operation is simple and the efficiency of replacing the molecular sieve is higher.

[0016] Third, in this application, the designed diversion plate and the perforations evenly opened at the bottom of the diversion plate allow acetonitrile to fall evenly from the perforations after being introduced, thereby making uniform contact between acetonitrile and molecular sieve, thus achieving a better dewatering effect on acetonitrile. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0018] Figure 2 This is a side sectional view of the dehydration tank II of this utility model;

[0019] Figure 3 This is a utility model Figure 2 Enlarged structural diagram at point A in the diagram;

[0020] Figure 4 This is a three-dimensional structural diagram of the flow divider of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the molecular sieve of this utility model.

[0022] The reference numerals and names in the figure are as follows:

[0023] 1. Dehydration tank one; 2. Dehydration tank two; 3. Fixing frame; 4. Sealing cover; 401. Pressure plate; 5. Feed pipe one; 501. Valve one; 6. Feed pipe two; 601. Valve two; 7. Main feed pipe; 701. Valve three; 8. Discharge pipe one; 9. Connecting pipe; 901. Valve four; 10. Discharge pipe two; 1001. Valve five; 11. Positioning groove; 12. Molecular sieve; 1201. Through hole; 1202. Handle; 13. Support ring; 14. Diverter plate; 1401. Perforation; 15. Connecting pipe; 16. Positioning sleeve; 17. Sealing ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 A dehydration device for anhydrous acetonitrile production includes a dehydration tank 1 and a dehydration tank 2, which are connected together by a fixing frame 3 to ensure their relative stability. A feed pipe 5 is connected to the side of dehydration tank 1, and a feed pipe 6 is connected to the side of dehydration tank 2. The ends of feed pipes 5 and 6 that are close to each other are connected to a main feed pipe 7. The bottom of dehydrating tank 1 is connected to discharge pipe 8, and the bottom of dehydrating tank 2 is connected to discharge pipe 10. A connecting pipe 9 connects the discharge port of discharge pipe 8 and the discharge port of discharge pipe 10. The tops of dehydrating tank 1 and dehydrating tank 2 are both sealed with sealing caps 4. Both dehydrating tank 1 and dehydrating tank 2 are equipped with dehydration components inside. The dehydration components include molecular sieve 12 and a hollow internal distribution plate 14. The molecular sieve 12 is located below the distribution plate 14.

[0026] Please see Figure 1 In this embodiment, valve 3 701 is installed on the main feed pipe 7, valve 1 501 is installed on the feed pipe 1 5, valve 2 601 is installed on the feed pipe 2 6, valve 4 901 is installed on the connecting pipe 9 at a position away from the discharge pipe 2 10, and valve 5 1001 is installed on the discharge pipe 2 10.

[0027] Specifically, valve 1 (501), valve 2 (601), valve 3 (701), valve 4 (901), and valve 5 (1001) can be either solenoid valves or manual valves, and can be selected according to the actual use environment. By installing valves on the corresponding pipes, the opening and closing of the pipe connection can be achieved.

[0028] Please see Figure 2 , Figure 3 and Figure 5 In this embodiment, positioning grooves 11 are provided on the inner walls of both dehydration tank 1 and dehydration tank 2. Each positioning groove 11 has a molecular sieve 12 on its inner bottom wall. Through holes 1201 are uniformly provided on the inner bottom wall of the molecular sieve 12. Handles 1202 are fixed on both sides of the top of the molecular sieve 12. The top of the handle 1202 is tightly fitted to the bottom of the diversion plate 14.

[0029] Specifically, the positioning groove 11 can be used to stably place the molecular sieve 12. The bottom of the molecular sieve 12 has a through hole 1201, which can facilitate the discharge of acetonitrile after dewatering. The top of the molecular sieve 12 has a handle 1202, which can be easily removed when the molecular sieve 12 is replaced. The top of the handle 1202 fits tightly with the bottom of the distribution plate 14, and the downward pressure of the distribution plate 14 can be used to press the molecular sieve 12, thereby ensuring the stability of the molecular sieve 12.

[0030] Please see Figure 2 , Figure 3 and Figure 4 In this embodiment, a support ring 13 is fixed in a ring shape on the inner wall of dehydration tank 1 and dehydration tank 2 at the top of the positioning groove 11. Each support ring 13 receives a diversion plate 14. A connecting pipe 15 is fixedly connected to one side of the diversion plate 14. A positioning sleeve 16 is fitted on the pipe body of the connecting pipe 15. Perforations 1401 are evenly opened at the bottom of the diversion plate 14.

[0031] Specifically, the support ring 13 is used to support the diversion plate 14, and there is a certain space between the side of the diversion plate 14 and the inner wall of the dewatering tank 1 (dewatering tank 2), so the diversion plate 14 can be moved laterally, and the connecting pipe 15 can be withdrawn from the feed pipe 5 (feed pipe 6), thus making it easy to remove the diversion plate 14. The bottom of the diversion plate 14 has a perforation 1401, and the opening area of ​​the perforation 1401 is smaller than the diameter of the molecular sieve 12 (that is, all the perforations 1401 are located above the molecular sieve 12), which can ensure that the acetonitrile falling from the perforation 1401 falls evenly on the molecular sieve 12, ensuring the dewatering effect. A positioning sleeve 16 is also provided on the connecting pipe 15, which can determine the stationary position after the positioning sleeve 16 is inserted, ensuring that the position of the diversion plate 14 is determined.

[0032] Please see Figure 2 and Figure 3 In this embodiment, the diversion plate 14 in the first dehydration tank 1 is connected to the second feed pipe 6 via the connecting pipe 15, and the diversion plate 14 in the second dehydration tank 2 is connected to the first feed pipe 5 via the connecting pipe 15. Both the first feed pipe 5 and the second feed pipe 6 are provided with sealing rings 17 made of rubber.

[0033] Specifically, both feed pipe 5 and feed pipe 6 are equipped with sealing rings 17 on their inner walls, which can provide a good sealing effect at the connection point when the connecting pipe 15 is inserted, ensuring the flow of acetonitrile.

[0034] Please see Figure 2 In this embodiment, two sealing caps 4 are connected to the top of the first dehydration tank 1 and the second dehydration tank 2 respectively by threaded connection, and a rubber sealing ring is provided at the bottom of each sealing cap 4. A pressure plate 401 is fixed at the bottom of each sealing cap 4, and the bottom of the pressure plate 401 is tightly attached to the top of the diverter plate 14.

[0035] Specifically, the bottom of the sealing cover 4 is provided with a rubber sealing ring, which can improve the sealing of the dehydration tank 1 (dehydration tank 2) after the sealing cover 4 is screwed in. The bottom of the sealing cover 4 is also provided with a pressure plate 401, which can be used to press the distribution plate 14 and indirectly press the molecular sieve 12 after the sealing cover 4 is screwed in, thereby ensuring the stability of the distribution plate 14 and the molecular sieve 12.

[0036] Please see Figure 1 and Figure 2 In this embodiment, the bottom of the inner cavity of both the first dehydration tank 1 and the second dehydration tank 2 is designed in the shape of a funnel. The main feed pipe 7 is used to introduce raw materials, and the connecting pipe 9 is used to discharge the dehydrated material.

[0037] Specifically, the bottom of the inner cavity of both dehydration tank 1 and dehydration tank 2 is designed in the shape of a funnel to facilitate the discharge of acetonitrile after dehydration. The main feed pipe 7 is connected to the feeding equipment for the introduction of raw materials, and the connecting pipe 9 is connected to the receiving equipment for the discharge of materials after dehydration.

[0038] When using:

[0039] Close valve 1 (501) and valve 4 (901), open valve 2 (601), valve 3 (701) and valve 5 (1001). Ethylene nitrile raw material is introduced into feed pipe 2 (6) through main feed pipe 7, and then into the diversion plate 14 in dewatering tank 2 through feed pipe 2 (6). Ethylene nitrile is discharged through multiple perforations 1401 at the bottom of diversion plate 14 and falls onto molecular sieve 12. After being dewatered by molecular sieve 12, it falls through through hole 1201 and enters discharge pipe 2 (10) and is discharged through connecting pipe 9.

[0040] When dehydration tank 2 has been used for a long time, and the molecular sieve 12 inside it reaches its service life, it needs to be replaced. During replacement, open valve 501 and valve 901, and close valve 601 and valve 1001. At this time, because inlet pipe 5, outlet pipe 8, and connecting pipe 9 are connected, while inlet pipe 6 and outlet pipe 10 are closed, acetonitrile can be diverted from inlet pipe 5 into dehydration tank 1 for dehydration and discharged through outlet pipe 8 and connecting pipe 9. Since no acetonitrile passes through dehydration tank 2 at this time, it can... Unscrew the sealing cap 4 on the second dehydration tank 2, and pull the distribution plate 14 in the second dehydration tank 2 to separate the connecting pipe 15 from the feed pipe 2 6. Then the distribution plate 14 can be removed from the second dehydration tank 2. Finally, the molecular sieve 12 can be removed from the second dehydration tank 2 through the handle 1202 on the molecular sieve 12 and replaced. By placing the new molecular sieve 12 in the second dehydration tank 2, then placing the distribution plate 14 into the second dehydration tank 2, and connecting the connecting pipe 15 on the distribution plate 14 to the feed pipe 2 6, and finally screwing in the sealing cap 4, the molecular sieve 12 in the second dehydration tank 2 can be quickly replaced.

[0041] When the molecular sieve 12 is replaced in dehydration tank 2, dehydration tank 1 can continue to dehydrate ethylene nitrile, thus avoiding downtime of dehydration operation. When the molecular sieve 12 in dehydration tank 1 reaches its service life, valve 2 601 and valve 5 1001 can be opened, and valve 1 501 and valve 4 901 can be closed, thereby rerouting the ethylene nitrile flow path and allowing it to enter dehydration tank 2 for dehydration. The molecular sieve 12 in dehydration tank 1 can be replaced in the same way as the molecular sieve 12 in dehydration tank 2, which will not be elaborated here. Since dehydration tank 1 and dehydration tank 2 can dehydrate ethylene nitrile alternately, when it is necessary to replace the molecular sieve 12 in dehydration tank 1 or dehydration tank 2, it is not necessary to stop the machine, thus maximizing production efficiency.

[0042] It should be noted that valves 501, 601, 701, 901, and 1001 can also be opened simultaneously. Through the diversion at the bottom of the main feed pipe 7, acetonitrile can be simultaneously introduced into dewatering tanks 1 and 2. The simultaneous operation of dewatering tanks 1 and 2 improves the dewatering efficiency and effect of acetonitrile. When it is necessary to replace any molecular sieve 12, it is only necessary to stop the operation of dewatering tank 1 or dewatering tank 2.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A dehydration device for the production of anhydrous acetonitrile, characterized in that, Including dehydration tank one (1) and dehydration tank two (2); The side of the first dehydration tank (1) is connected to the first feed pipe (5), and the side of the second dehydration tank (2) is connected to the second feed pipe (6). The ends of the first feed pipe (5) and the second feed pipe (6) that are close to each other are connected to the main feed pipe (7). The bottom of the first dehydration tank (1) is connected to the first discharge pipe (8), and the bottom of the second dehydration tank (2) is connected to the second discharge pipe (10). The discharge port of the first discharge pipe (8) and the discharge port of the second discharge pipe (10) are connected by a connecting pipe (9). The top of both the first dehydration tank (1) and the second dehydration tank (2) are sealed with a sealing cover (4). Both the first dehydration tank (1) and the second dehydration tank (2) are equipped with a dehydration component. The dehydration component includes a molecular sieve (12) and a flow divider (14) with an internal hollow structure. The molecular sieve (12) is located below the flow divider (14).

2. The dehydration device for anhydrous acetonitrile production according to claim 1, characterized in that, The main feed pipe (7) is equipped with valve three (701), the feed pipe one (5) is equipped with valve one (501), the feed pipe two (6) is equipped with valve two (601), the connecting pipe (9) is equipped with valve four (901) at a position away from the discharge pipe two (10), and the discharge pipe two (10) is equipped with valve five (1001).

3. The dehydration device for anhydrous acetonitrile production according to claim 1, characterized in that, The inner walls of the first dehydration tank (1) and the second dehydration tank (2) are provided with positioning grooves (11). The inner bottom wall of each positioning groove (11) is supported by a molecular sieve (12). The inner bottom wall of the molecular sieve (12) is uniformly provided with through holes (1201). The top two sides of the molecular sieve (12) are fixed with handles (1202). The top of the handles (1202) is tightly fitted with the bottom of the diverter plate (14).

4. The dehydration device for anhydrous acetonitrile production according to claim 1, characterized in that, The inner walls of the first dehydration tank (1) and the second dehydration tank (2) are fixed with a support ring (13) in a ring shape at the top of the positioning groove (11). Each support ring (13) is connected to a diverter plate (14). A connecting pipe (15) is fixedly connected to one side of the diverter plate (14). A positioning sleeve (16) is fitted on the pipe body of the connecting pipe (15). Perforations (1401) are evenly opened at the bottom of the diverter plate (14).

5. A dehydration device for anhydrous acetonitrile production according to claim 4, characterized in that, The diversion plate (14) in the first dehydration tank (1) is connected to the second feed pipe (6) through the connecting pipe (15), and the diversion plate (14) in the second dehydration tank (2) is connected to the first feed pipe (5) through the connecting pipe (15). Both the first feed pipe (5) and the second feed pipe (6) are provided with sealing rings (17).

6. The dehydration device for anhydrous acetonitrile production according to claim 1, characterized in that, The two sealing caps (4) are connected to the top of the first dehydration tank (1) and the second dehydration tank (2) respectively by threaded connection. Each sealing cap (4) has a rubber sealing ring at the bottom and a pressure plate (401) is fixed at the bottom of each sealing cap (4). The bottom of the pressure plate (401) is tightly attached to the top of the diverter plate (14).

7. A dehydration device for anhydrous acetonitrile production according to claim 1, characterized in that, The bottom of the inner cavity of both the first dehydration tank (1) and the second dehydration tank (2) is designed in the shape of a funnel. The main feed pipe (7) is used to introduce raw materials, and the connecting pipe (9) is used to discharge the dehydrated material.

8. A dehydration device for anhydrous acetonitrile production according to claim 1, characterized in that, The first dehydration tank (1) and the second dehydration tank (2) are connected together by a fixing frame (3).

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