Polystyrene anti-explosion polymerization device

Abstract

The utility model discloses a polystyrene anti-explosion polymerization device which comprises a prepolymerization reactor and a terminating agent tank, the bottom of the terminating agent tank is connected with the top of the prepolymerization reactor through a first pipeline, an automatic control stop valve is arranged on the first pipeline, the prepolymerization reactor is provided with a stirring unit, a terminating agent is stored in the terminating agent tank, and the terminating agent tank is provided with an automatic control stop valve. A first switch valve, a second switch valve and a third switch valve are arranged on the first pipeline, the third switch valve is close to the prepolymerization reactor, and the first switch valve and the second switch valve are arranged on the two sides of the self-control stop valve respectively. According to the polystyrene anti-explosion polymerization device disclosed by the utility model, through the first switch valve, the second switch valve and the third switch valve, the situation of internal leakage of a terminating agent can be effectively prevented, so that the structural design of the anti-explosion polymerization device is reasonable, and meanwhile, the terminating agent can be urgently added into a prepolymerization reactor to terminate reaction through the self-control stop valve; further, an explosion-proof membrane of the prepolymerization reactor is prevented from being broken, so that the safety production performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of polystyrene production technology, and in particular to a polystyrene explosion-proof polystyrene production device. Background Technology

[0002] Polystyrene polymerization is a complex chemical process involving multiple steps and reaction conditions. During the reaction, styrene monomers gradually link together into long-chain molecules under the action of a catalyst to form polystyrene. However, this reaction is exothermic. As the reaction temperature increases, the reaction intensifies, the evaporation rate increases rapidly, the number of gaseous molecules increases, and the material reaction is very easy to get out of control. Therefore, it is necessary to control the reaction temperature and pressure to avoid side reactions or damage to equipment.

[0003] The prepolymerization reactor is a gas-liquid two-phase reactor. The gas phase contains a large amount of evaporated styrene and ethylbenzene mixture, while the liquid phase styrene undergoes a polymerization reaction inside the reactor. When the reaction temperature and pressure are out of control, explosive polymerization can easily occur. In mild cases, the explosion-proof membrane will rupture and the material will be discharged. In severe cases, the equipment itself will be damaged, and harmful gases will be released, polluting the atmosphere.

[0004] Existing technologies for controlling polymerization reactions include: 1. condensing styrene and ethylbenzene vapors into a liquid phase via a condenser and refluxing it into the prepolymerization reactor to achieve heat removal; 2. circulating low-temperature heat transfer oil through the prepolymerization reactor coils to remove heat; 3. feeding cold styrene and circulating liquid to balance or lower the reaction temperature. However, these methods are relatively slow in removing heat, have limited effect on inhibiting the reaction, and cannot immediately terminate the reaction when it runs out of control. Utility Model Content

[0005] The purpose of this invention is to provide a polystyrene explosion-proof device with a reasonable structural design and improved safety performance.

[0006] To solve the above technical problems, the present invention can be implemented using the following technical solutions:

[0007] An explosion-proof polystyrene polymerization device includes a prepolymerization reactor and a terminator tank. The bottom of the terminator tank is connected to the top of the prepolymerization reactor via a first pipe, and a self-controlled shut-off valve is installed on the first pipe. The prepolymerization reactor is equipped with a stirring unit. The terminator tank contains a terminator. A first switch valve, a second switch valve, and a third switch valve are installed on the first pipe, with the third switch valve close to the prepolymerization reactor. The first switch valve and the second switch valve are respectively located on both sides of the self-controlled shut-off valve.

[0008] In one embodiment, the side wall of the terminating agent tank is provided with a liquid level window, and a liquid level indicator is provided on the side of the liquid level window.

[0009] In one embodiment, the top of the terminator tank has a terminator addition port and a sealing port, while the bottom of the terminator tank has a terminator delivery port.

[0010] In one embodiment, the bottom of the terminating agent container is also provided with triangularly distributed support feet.

[0011] In one embodiment, the sealing port is connected to a second pipe, the other end of which is connected to a nitrogen cylinder. A needle valve, a pressure reducing valve, and a main valve for the nitrogen cylinder are sequentially installed on the second pipe.

[0012] In one embodiment, a pressure sensor is provided on the prepolymerization reactor.

[0013] In one embodiment, a temperature sensor is also provided on the prepolymerization reactor.

[0014] In one embodiment, the stirring device includes a stirring motor, a stirring rod, and stirring paddles. The stirring motor is located at the top of the prepolymerization reactor. One end of the stirring rod is connected to the stirring motor, and the other end extends into the prepolymerization reactor. Several stirring paddles are arranged at the extended end of the stirring rod. The stirring motor drives the stirring rod to rotate, thereby causing the stirring paddles to rotate.

[0015] In one embodiment, the prepolymerization reactor operates at a temperature of 118°C-122°C and a pressure of 48 kPaA-52 kPaA.

[0016] In one embodiment, the diameter of the terminating agent container is 350 mm. Beneficial effects

[0017] This utility model of an explosion-proof polystyrene polymerization device, by setting a first switch valve, a second switch valve and a third switch valve on the first pipeline respectively, when the terminator tank is connected to the prepolymerization reactor, the third switch valve, the second switch valve and the first switch valve are opened in sequence, thereby effectively preventing the terminator in the terminator tank from leaking internally, thus making the structure design of the explosion-proof polymerization device reasonable.

[0018] In addition, when a reaction goes out of control, the system will automatically open the self-controlled shut-off valve to urgently add the terminator from the terminator tank into the prepolymerization reactor to terminate the reaction. This prevents the explosion-proof membrane of the prepolymerization reactor from rupturing due to overheating or overpressure, and prevents leaks, fires, and explosions caused by the release of harmful vapors, thereby improving safe production performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the polystyrene explosion-proof polystyrene device of this utility model;

[0020] Figure 2 This is a schematic diagram of the terminator tank of the polystyrene explosion-proof polymerization device of this utility model.

[0021] As shown in the attached diagram:

[0022] 100. Prepolymerization reactor; 110. Stirring unit; 111. Stirring motor; 112. Stirring rod; 113. Stirring paddle; 120. Pressure sensor; 130. Temperature sensor;

[0023] 200. Terminator tank; 210. Liquid level window; 220. Terminator addition port; 230. Sealing port; 240. Terminator delivery port;

[0024] 300, First pipeline; 310, Automatic shut-off valve; 320, First switching valve; 330, Second switching valve; 340, Third switching valve;

[0025] 400. Second pipeline; 410. Needle valve; 420. Pressure reducing valve; 430. Nitrogen cylinder main valve;

[0026] 500. Nitrogen cylinder. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Please see Figure 1 A polystyrene explosion-proof polymerization device includes a prepolymerization reactor 100 and a terminator tank 200. The bottom of the terminator tank 200 is connected to the top of the prepolymerization reactor 100 through a first pipe 300, and a self-controlled shut-off valve 310 is provided on the first pipe 300. The prepolymerization reactor 100 is equipped with a stirring unit 110. The terminator tank 200 contains a terminator. The first pipe 300 is also equipped with a first switch valve 320, a second switch valve 330 and a third switch valve 340, with the third switch valve 340 close to the prepolymerization reactor 100. The first switch valve 320 and the second switch valve 330 are respectively located on both sides of the self-controlled shut-off valve 310.

[0031] Specifically, in this embodiment, the prepolymerization reactor 100 is connected to the terminator tank 200 via the first pipeline 300, and a self-controlled shut-off valve 310 is installed on the first pipeline 300. When the reaction in the prepolymerization reactor 100 becomes uncontrolled, the explosion-proof polymerization device system will automatically open the self-controlled shut-off valve 310, thereby urgently adding the terminator from the terminator tank 200 into the prepolymerization reactor 100 to terminate the reaction inside the prepolymerization reactor 100. This prevents the explosion-proof membrane of the prepolymerization reactor 100 from rupturing due to overheating or overpressure, and prevents accidents such as leaks, fires, and explosions caused by the release of harmful vapors, thereby improving safe production performance.

[0032] Meanwhile, in order to make the structural design between the prepolymerization reactor 100 and the terminator tank 200 reasonable, in this embodiment, a first switching valve 320, a second switching valve 330 and a third switching valve 340 are respectively installed on the first pipeline 300. After the terminator tank 200 is connected to the prepolymerization reactor 100, the third switching valve 340, the second switching valve 330 and the first switching valve 320 are opened in sequence. Through this opening method, the internal leakage of the terminator in the terminator tank 200 (leaking into the prepolymerization reactor 100) can be effectively prevented, thereby making the structural design of the explosion-proof polymerization device reasonable.

[0033] In addition, in this embodiment, in order to achieve the interlocking use of the self-controlled shut-off valve 310, a pressure sensor 120 and a temperature sensor 130 are installed on the prepolymerization reactor 100. The pressure sensor 120 can monitor the pressure inside the prepolymerization reactor 100, and the temperature sensor 130 can monitor the temperature inside the prepolymerization reactor 100. The normal operating temperature of the prepolymerization reactor 100 is 118℃-122℃, and the pressure is 48kPaA-52kPaA. When the pressure sensor 120 detects that the pressure inside the prepolymerization reactor 100 is greater than 115kPaA, or the temperature sensor 130 detects that the temperature inside the prepolymerization reactor 100 exceeds 133℃, the system will open the self-controlled shut-off valve 310, thereby urgently adding the terminator in the terminator tank 200 into the prepolymerization reactor 100 to terminate the reaction, thereby improving the safety of production performance.

[0034] Please see Figure 1 and Figure 2 To ensure a reasonable structural design for the explosion-proof polymerization device, in this embodiment, triangularly distributed support feet 250 are provided at the bottom of the terminator tank 200 to stably fix the terminator tank 200. The diameter of the terminator tank 200 is 350mm to facilitate the storage of the terminator. A liquid level window 210 is provided on the side wall of the terminator tank 200, and a liquid level indicator (not shown in the figure) is provided on the side of the liquid level window 210. The amount of terminator in the terminator tank 200 can be observed through the liquid level window 210 and the liquid level indicator. When the terminator tank 200 is connected to the prepolymerization reactor... After connecting 100 and opening the third switch valve 340, the second switch valve 330, and the first switch valve 320 in sequence, the operator can observe the terminating agent in the terminating agent tank 200 through the liquid level window 210 and the liquid level indicator. If the liquid level of the terminating agent does not drop after ten minutes, it indicates that the self-controlled shut-off valve 310 is normal and can be interlocked and put into use. If the liquid level of the terminating agent drops after ten minutes, it indicates that the self-controlled shut-off valve 310 is abnormal and cannot be used normally. Thus, the self-controlled shut-off valve 310 can be repaired or replaced in time, effectively preventing the terminating agent from leaking internally, thereby making the structure design of the explosion-proof polymer device reasonable.

[0035] In addition, to facilitate the addition and sealing of the terminating agent into the terminating agent tank 200, a terminating agent addition port 220 and a sealing port 230 are provided at the top of the terminating agent tank 200. The terminating agent can be added into the terminating agent tank 200 through the terminating agent addition port 220. A terminating agent delivery port 240 is provided at the bottom of the terminating agent tank 200 and is connected to the first pipeline 300. The sealing port 230 is connected to the second pipeline 400, and the other end of the second pipeline 400 is connected to a nitrogen cylinder 500. A needle valve 410, a pressure reducing valve 420, and a nitrogen cylinder main valve 430 are sequentially installed on the second pipeline 400. The terminating agent tank 200 is filled with 0.5 kg / m³ of nitrogen through the nitrogen cylinder 500. 2 Nitrogen gas is used to seal the terminating agent. During inflation, open pressure reducing valve 420 and check and confirm that the gauge pressure of pressure reducing valve 420 does not exceed 0.5 kg / m³. 2 Then open the needle valve 410 and the oxygen cylinder main valve 430 to allow nitrogen to be introduced.

[0036] Finally, please see Figure 1 To enable the terminator to terminate the reaction more quickly, the stirring device 110 in this embodiment includes a stirring motor 111, a stirring rod 112, and stirring paddles 113. The stirring motor 111 is located at the top of the prepolymerization reactor 100. One end of the stirring rod 112 is connected to the stirring motor 111, and the other end extends into the prepolymerization reactor 100. Several stirring paddles 113 are arranged at the extended end of the stirring rod 112. When the terminator is urgently added into the prepolymerization reactor 100, the stirring motor 111 drives the stirring rod 112 to rotate. As the stirring rod 112 rotates, it also rotates the stirring paddles 113. During the rotation of the stirring paddles 113, the terminator comes into contact with the reactants in the prepolymerization reactor 100 more quickly, thereby rapidly terminating the reaction and preventing runaway reaction.

[0037] Furthermore, when the current of the stirring motor 110 exceeds 160A, the system can also open the self-controlled shut-off valve 310, so that the terminator in the terminator tank 200 is automatically added to the prepolymerization reactor 100, thereby achieving the purpose of inhibiting and terminating the reaction.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description; however, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model; furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A polystyrene explosion-proof polymerization apparatus characterized by comprising: The pre-polymerization reactor and a terminator tank are included, the bottom of the terminator tank is connected with the top of the pre-polymerization reactor through a first pipeline, and a self-control cut-off valve is arranged on the first pipeline; The pre-polymerization reactor is provided with a stirring unit, the terminator tank stores a terminator, and a first switch valve, a second switch valve and a third switch valve are arranged on the first pipeline, and the third switch valve is close to the pre-polymerization reactor, and the first switch valve and the second switch valve are arranged on the two sides of the self-control cut-off valve respectively.

2. The polystyrene explosion containment vessel of claim 1, wherein: The sidewall of the terminator tank is provided with a liquid level window, and a liquid level mark is arranged on the side of the liquid level window.

3. The polystyrene explosion containment vessel of claim 1, wherein: The top of the terminator tank is provided with a terminator adding port and a sealing port, and the bottom of the terminator tank is provided with a terminator conveying port.

4. The polystyrene explosion containment vessel of claim 3, wherein: The bottom of the terminator tank is further provided with triangular support feet.

5. The polystyrene explosion containment vessel of claim 3, wherein: The sealing port is connected with a second pipeline, the other end of the second pipeline is connected with a nitrogen cylinder, and a needle valve, a pressure reducing valve and a nitrogen cylinder total valve are arranged on the second pipeline in sequence.

6. The polystyrene explosion containment vessel of claim 1, wherein: The pre-polymerization reactor is provided with a pressure sensor.

7. The polystyrene explosion containment vessel of claim 1, wherein: The pre-polymerization reactor is further provided with a temperature sensor.

8. The polystyrene explosion containment vessel of claim 1, wherein: The stirring device includes a stirring motor, a stirring rod and stirring paddles, the stirring motor is arranged at the top of the pre-polymerization reactor, one end of the stirring rod is connected with the stirring motor, the other end of the stirring rod extends into the pre-polymerization reactor, and a plurality of stirring paddles are arranged on the extending end of the stirring rod, the stirring motor drives the stirring rod to rotate, so that the stirring paddles rotate.

9. The polystyrene explosion containment vessel of claim 1, wherein: The working temperature of the pre-polymerization reactor is 118-122℃, and the working pressure is 48-52kPaA.

10. The polystyrene explosion containment vessel of claim 1, wherein: The diameter of the terminator tank is 350mm.

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