Automatic reaction device for dicyandiamide polymerization process

Abstract

The utility model relates to the technical field of chemical production, in particular to an automatic reaction device for a dicyandiamide polymerization procedure, which comprises a reaction kettle main body, a PLC (programmable logic controller) control box is fixedly mounted at the bottom end of the reaction kettle main body, a feeding pump is fixedly mounted on the side wall of the reaction kettle main body, and a suction pipe is communicated with the side wall of the feeding pump. And a feeding pipe is arranged at the top end of the feeding pump in a communicating manner. According to the reaction kettle, a cyanamide solution in the reaction kettle main body can be stirred, the temperature of the cyanamide solution can be uniformly absorbed, the heating efficiency of the cyanamide solution can be improved, the production efficiency can be further improved, automatic control can be realized by matching the temperature monitor, the PH monitor and the liquid level sensor with the PLC control box, and the production efficiency is improved. And the waste gas treated by the waste gas treatment box can be exhausted along the exhaust pipe, so that the emission of harmful gas is effectively reduced, the working environment is improved, and the safety of workers is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to an automated reaction device for the dicyandiamide polymerization process. Background Technology

[0002] Dicyandiamide, abbreviated as DICY or DCD, is an organic compound with the chemical formula C2H4N4. It is a dimer of cyanamide and a cyano derivative of guanidine. It is a white crystalline powder, soluble in water, alcohol, ethylene glycol, and dimethylformamide, but almost insoluble in ether and benzene. It is stable when dry. In the preparation of dicyandiamide, a suspension of calcium cyanamide obtained by hydrolyzing calcium cyanamide is filtered under reduced pressure to remove calcium hydroxide residue. Carbon dioxide is then introduced into the filtrate to precipitate calcium as calcium carbonate, yielding an aminocyanide solution. This solution is then polymerized under alkaline conditions. After filtration, cooling crystallization, separation, and drying, dicyandiamide is obtained. Polymerization is a chemical reaction process that combines monomer molecules into high molecular weight compounds. In chemical production, polymerization reactions are widely used in synthetic fibers, plastics, rubber, coatings, and other fields.

[0003] Traditional polymerization reactions are usually carried out in open reactors. Open reactors require manual operation during the reaction process, which leads to slower reaction efficiency and further affects production efficiency. In addition, the waste gas generated during the polymerization process may overflow from the open reactor. The waste gas contains certain harmful gases. When the waste gas diffuses into the production workshop, it can easily lead to a deterioration of the working environment and affect the safety of the workers.

[0004] To address this, an automated reaction device for the dicyandiamide polymerization process is proposed. Utility Model Content

[0005] The purpose of this invention is to provide an automated reaction device for the dicyandiamide polymerization process.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An automated reaction device for dicyandiamide polymerization includes: a reaction vessel body, a PLC control box fixedly installed at the bottom of the reaction vessel body, a feeding pump fixedly installed on the side wall of the reaction vessel body, a suction pipe connected to the side wall of the feeding pump, a feeding pipe connected to the top of the feeding pump, the top of the feeding pipe being connected to the top wall of the reaction vessel body, and a mixing component also provided at the top of the reaction vessel body;

[0008] The mixing assembly includes a first motor fixedly installed at the center of the top of the reactor body. The output end of the first motor extends into the reactor body and is fixedly connected to a drive shaft. Multiple stirring blades are uniformly fixedly installed on the outer wall of the drive shaft.

[0009] Preferably, a feeding pipe is connected to the top of the reactor body, a discharge pipe is connected to the center of the bottom of the reactor body, and a sampling pipe is connected to the side wall of the top of the reactor body.

[0010] Preferably, a spiral tube is provided inside the side wall of the reactor body, the top end of the spiral tube extends to the side wall at the top of the reactor body and is connected to a steam inlet pipe, and the bottom end of the spiral tube extends to the side wall at the bottom of the reactor body and is connected to a condensate discharge pipe.

[0011] Preferably, a liquid level sensor electrically connected to the feed pump is installed on the inner wall at the top of the reactor body, and a temperature monitor and a pH monitor are also installed on the inner wall at the bottom of the reactor body.

[0012] Preferably, the top of the reactor body is further provided with a waste gas treatment component. The waste gas treatment component includes an exhaust cylinder fixedly installed on the top wall of the reactor body. An intake pipe is connected to the center of the side wall of the exhaust cylinder. The end of the intake pipe away from the exhaust cylinder is connected to the top wall of the reactor body. A guide pipe is connected to the outer wall of the exhaust cylinder. The other end of the guide pipe is connected to a waste gas treatment box. An exhaust pipe is connected to the side wall of the waste gas treatment box.

[0013] Preferably, the air extraction cylinder has a centrifugal chamber inside, and an impeller is provided on the side wall of the centrifugal chamber.

[0014] Preferably, a second motor is fixedly installed on the side wall of the suction cylinder, and the output end of the second motor extends into the centrifuge chamber and is fixedly connected to the central shaft of the impeller.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. By setting up a mixing component, during operation, cyanamide solution is injected into the reactor body through the feed pipe and suction pipe on the feed pump. When the liquid level sensor detects that the liquid level has reached the set requirement, the feed pump automatically shuts off. Then, hot steam is injected into the spiral tube through the steam inlet pipe to heat the cyanamide solution. Next, the first motor is started, which drives the drive shaft to rotate inside the reactor body. At this time, the stirring blades on the outer wall of the drive shaft can stir the cyanamide solution inside the reactor body, which can make the temperature absorption of the cyanamide solution uniform, improve the heating efficiency of the cyanamide solution, and further improve the production efficiency. Moreover, the temperature monitor, pH monitor, and liquid level sensor, together with the PLC control box, can realize automated control, avoid the error of manual operation, and improve production efficiency.

[0017] 2. By setting up an exhaust gas treatment component and energizing the second motor, the second motor can drive the impeller to rotate at high speed in the centrifuge chamber. At this time, a negative pressure is generated in the suction pipe, and the exhaust gas in the main body of the reactor can enter the centrifuge chamber through the suction pipe. Under the conveying of the impeller, it can enter the exhaust gas treatment box through the guide pipe. The exhaust gas treated by the exhaust gas treatment box can be discharged through the exhaust pipe, which effectively reduces the emission of harmful gases, improves the working environment, and is conducive to the safety of the staff. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0020] Figure 3 This is a schematic diagram of the outer structure of the air extraction cylinder of this utility model;

[0021] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of BB.

[0022] In the diagram: 1. Reactor body; 2. Feed pipe; 3. Steam inlet pipe; 4. Feeding pipe; 5. First motor; 6. Exhaust pipe; 7. Vacuum pump; 8. Second motor; 9. Waste gas treatment box; 10. Sampling pipe; 11. Condensate discharge pipe; 12. PLC control box; 13. Discharge pipe; 14. Suction pipe; 15. Feed pump; 16. pH monitor; 17. Temperature monitor; 18. Liquid level sensor; 19. Drive shaft; 20. Stirring blade; 21. Spiral tube; 22. Suction pipe; 23. Air guide pipe; 24. Impeller; 25. Centrifuge chamber. Detailed Implementation

[0023] 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.

[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example 1:

[0026] Please see Figures 1 to 3The present invention provides a technical solution: To achieve the above objectives, the present invention provides the following technical solution: A reaction device, comprising: a reaction vessel body 1, a PLC control box 12 fixedly installed at the bottom end of the reaction vessel body 1, a feeding pump 15 fixedly installed on the side wall of the reaction vessel body 1, a suction pipe 14 connected to the side wall of the feeding pump 15, a feeding pipe 2 connected to the top end of the feeding pump 15, the top end of the feeding pipe 2 being connected to the top wall of the reaction vessel body 1, and a mixing component also provided at the top end of the reaction vessel body 1, the mixing component comprising a first motor 5 fixedly installed at the center of the top end of the reaction vessel body 1, the output end of the first motor 5 extending into the reaction vessel body 1 and fixedly connected to a drive shaft 19, and a plurality of stirring blades 20 uniformly fixedly installed on the outer wall of the drive shaft 19.

[0027] Please see Figure 2 The top of the reactor body 1 is also connected to a feeding pipe 4, the bottom center of the reactor body 1 is also connected to a discharge pipe 13, and the top side wall of the reactor body 1 is connected to a sampling pipe 10.

[0028] Please see Figure 2 A spiral tube 21 is provided inside the side wall of the reactor body 1. The top end of the spiral tube 21 extends to the side wall at the top of the reactor body 1 and is connected to a steam inlet pipe 3. The bottom end of the spiral tube 21 extends to the side wall at the bottom of the reactor body 1 and is connected to a condensate discharge pipe 11.

[0029] Please see Figure 2 A liquid level sensor 18 electrically connected to the feed pump 15 is installed on the inner wall at the top of the reactor body 1, and a temperature monitor 17 and a pH monitor 16 are also installed on the inner wall at the bottom of the reactor body 1.

[0030] In this embodiment, during use, cyanamide solution is injected into the reactor body 1 through the feed pipe 2 and suction pipe 14 on the feed pump 15. When the liquid level sensor 18 detects that the liquid level has reached the set requirement, the feed pump 15 automatically shuts off. Then, hot steam is injected into the spiral tube 21 through the steam inlet pipe 3 to heat the cyanamide solution. Next, the first motor 5 is started, which drives the drive shaft 19 to rotate inside the reactor body 1. At this time, the stirring blades 20 on the outer wall of the drive shaft 19 can stir the cyanamide solution inside the reactor body 1, which can make the temperature absorption of the cyanamide solution uniform, improve the heating efficiency of the cyanamide solution, and further improve the production efficiency. Moreover, the temperature monitor 17, pH monitor 16 and liquid level sensor 18, together with the PLC control box 12, can realize automated control and avoid the error of manual operation.

[0031] Example 2:

[0032] Please see Figures 1 to 4This utility model provides a technical solution: an automated reaction device for dicyandiamide polymerization process, which further includes: a waste gas treatment component installed at the top of the reactor body 1. The waste gas treatment component includes an exhaust cylinder 7 fixedly installed on the top wall of the reactor body 1. An exhaust pipe 22 is connected to the center of the side wall of the exhaust cylinder 7. One end of the exhaust pipe 22 away from the exhaust cylinder 7 is connected to the top wall of the reactor body 1. A gas guide pipe 23 is connected to the outer wall of the exhaust cylinder 7. The other end of the gas guide pipe 23 is connected to a waste gas treatment box 9. An exhaust pipe 6 is connected to the side wall of the waste gas treatment box 9.

[0033] Please see Figure 4 The air extraction cylinder 7 has a centrifugal chamber 25, and an impeller 24 is installed on the side wall of the centrifugal chamber 25.

[0034] Please see Figure 4 A second motor 8 is fixedly installed on the side wall of the suction cylinder 7. The output end of the second motor 8 extends into the centrifuge chamber 25 and is fixedly connected to the central shaft of the impeller 24.

[0035] In this embodiment, when in use, the second motor 8 is energized, which drives the impeller 24 to rotate at high speed in the centrifuge chamber 25. At this time, a negative pressure is generated in the suction pipe 7, and the waste gas in the reactor body 1 can enter the centrifuge chamber 25 through the suction pipe 22. Under the conveying of the impeller 24, it can enter the waste gas treatment box 9 through the guide pipe 23. The waste gas treated by the waste gas treatment box 9 can be discharged through the exhaust pipe 6, which effectively reduces the emission of harmful gases, improves the working environment, and is beneficial to the safety of the staff.

[0036] Working principle: First, cyanamide solution is injected into the reactor body 1 through the feed pipe 2 and suction pipe 14 on the feed pump 15. When the liquid level sensor 18 detects that the liquid level has reached the set requirement, the feed pump 15 automatically shuts off. Then, hot steam is injected into the spiral tube 21 through the steam inlet pipe 3 to heat the cyanamide solution. Next, the first motor 5 is started, which drives the drive shaft 19 to rotate inside the reactor body 1. At this time, the stirring blades 20 on the outer wall of the drive shaft 19 can stir the cyanamide solution in the reactor body 1, which can make the temperature absorption of the cyanamide solution uniform, improve the heating efficiency of the cyanamide solution, and further improve the production efficiency. Moreover, the temperature monitor 17, pH monitor 16 and liquid level sensor 18, together with the PLC control box 12, can realize automated control. This system avoids errors caused by manual operation. During the reaction, the pH value of the cyanamide solution is monitored by a pH monitor 16. When the pH value of the cyanamide solution is lower than 10.5-11, a small amount of caustic soda flakes is added through the feeding pipe 4. When the pH value is higher than 11, the discharge valve on the discharge pipe 13 is opened to start discharging. In use, the second motor 8 is energized, which drives the impeller 24 to rotate at high speed in the centrifuge chamber 25. At this time, a negative pressure is generated in the suction pipe 7, and the waste gas in the main body of the reactor 1 can enter the centrifuge chamber 25 through the suction pipe 22. Under the conveying of the impeller 24, it can enter the waste gas treatment box 9 through the gas guide pipe 23. The waste gas treated by the waste gas treatment box 9 can be discharged through the exhaust pipe 6, which effectively reduces the emission of harmful gases, improves the working environment, and is beneficial to the safety of the staff.

[0037] In the description of this utility model, it should be understood that the terms "center", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dicyandiamide polymerization process automated reaction apparatus comprising: The reactor body (1) is characterized in that: a PLC control box (12) is fixedly installed at the bottom of the reactor body (1), a feeding pump (15) is fixedly installed on the side wall of the reactor body (1), a suction pipe (14) is connected to the side wall of the feeding pump (15), a feeding pipe (2) is connected to the top of the feeding pump (15), the top of the feeding pipe (2) is connected to the top wall of the reactor body (1), and a mixing component is also provided at the top of the reactor body (1). The mixing assembly includes a first motor (5) fixedly installed at the center of the top of the reactor body (1). The output end of the first motor (5) extends into the reactor body (1) and is fixedly connected to a drive shaft (19). Multiple stirring blades (20) are uniformly fixedly installed on the outer wall of the drive shaft (19). The top of the reactor body (1) is also provided with a waste gas treatment component; The waste gas treatment assembly includes an exhaust cylinder (7) fixedly installed on the top wall of the reactor body (1). An intake pipe (22) is connected to the center of the side wall of the exhaust cylinder (7). One end of the intake pipe (22) away from the exhaust cylinder (7) is connected to the top wall of the reactor body (1). A guide pipe (23) is connected to the outer wall of the exhaust cylinder (7). The other end of the guide pipe (23) is connected to a waste gas treatment box (9). An exhaust pipe (6) is connected to the side wall of the waste gas treatment box (9). The air extraction cylinder (7) has a centrifugal chamber (25) inside, and an impeller (24) is provided on the side wall of the centrifugal chamber (25). A second motor (8) is fixedly installed on the side wall of the suction cylinder (7), and the output end of the second motor (8) extends into the centrifuge chamber (25) and is fixedly connected to the central shaft of the impeller (24).

2. The automatic reaction device for dicyandiamide polymerization process according to claim 1, characterized in that: The top of the reactor body (1) is also connected to a feeding pipe (4), the center of the bottom of the reactor body (1) is also connected to a discharge pipe (13), and the side wall of the top of the reactor body (1) is connected to a sampling pipe (10).

3. The automatic reaction device for dicyandiamide polymerization process according to claim 2, characterized in that: A spiral tube (21) is provided inside the side wall of the reactor body (1). The top end of the spiral tube (21) extends to the side wall at the top of the reactor body (1) and is connected to a steam inlet pipe (3). The bottom end of the spiral tube (21) extends to the side wall at the bottom of the reactor body (1) and is connected to a condensate discharge pipe (11).

4. The automatic reaction device for dicyandiamide polymerization process according to claim 3, characterized in that: A liquid level sensor (18) electrically connected to a feed pump (15) is provided on the inner wall at the top of the reactor body (1), and a temperature monitor (17) and a pH monitor (16) are also provided on the inner wall at the bottom of the reactor body (1).

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