Degassing separation device

Abstract

The utility model relates to a degassing separation device, including degassing tank (1), foam breaking device (2) and inlet pipe (3), and the top of degassing tank is provided with air inlet (12) and air outlet (11), and the bottom is provided with discharge port (13). Foam breaking device sets up on the air outlet, and is provided with material inlet (23), material outlet (22) and dosing port (24) on foam breaking device, and is provided with mixing device inside to make the rapid mixing of reagent and material. Material inlet and air outlet fixed connection, dosing port is located on foam breaking device one end close to material outlet. Mixing device is located between dosing port and material inlet, and inlet pipe is set up in the degassing tank, and the upper end is communicated with air inlet, and the lower end extends to the middle part of degassing tank. The utility model can eliminate the foam in material quickly. Solve the problem that the foam is produced in polyvinyl chloride paste resin latex, and the self -polymerization in equipment is caused when degassing, and the problem that the degassing efficiency is low, and the output is affected.

Description

Technical Field

[0001] This utility model relates to a degassing and separation device, and more particularly to the structure of the degassing and separation device. Background Technology

[0002] Polyvinyl chloride (PVC) paste resin refers to this type of resin that is mainly used in the form of paste. It is also known as plasticizer paste. It has the characteristics of stable performance, easy control, excellent product performance and good chemical stability. It is widely used in the production of artificial leather, paint coatings, foamed plastics and so on.

[0003] Polyvinyl chloride (PVC) paste resin is usually produced by emulsion method and micro-suspension method. The emulsion method uses vinyl chloride monomer to polymerize in the aqueous phase. If there is already a polymer latex, by controlling the material ratio and conditions, the vinyl chloride monomer will polymerize only on the already generated latex particles and no new particles will be formed. Therefore, it is called "emulsion seed polymerization".

[0004] The micro-suspension method uses vinyl chloride monomer as raw material to polymerize and prepare two types of seeds: emulsion seeds and MSP seeds under the action of desalinated water, dispersants and initiators. Then, polyvinyl chloride paste resin (EPVC) latex is produced by micro-suspension polymerization. The latex is then dried into a white powder by equipment such as fluidized bed. Finally, it is ground into EPVC finished product with appropriate particle size by a grinder.

[0005] After the EPVC latex reaction is complete, some unreacted vinyl chloride monomer needs to be recovered (i.e., degassed). This is to reduce residual vinyl chloride in the product and decrease the consumption of vinyl chloride monomer. The degasing method involves storing the EPVC latex in a storage tank and using a vacuum pump to extract the gaseous vinyl chloride monomer from the top of the tank. Because anionic surfactants are added during polymerization, foam is easily generated in the EPVC latex during degasing. This foam carries EPVC latex, vinyl chloride, and other substances, which continue to react in the degasing system, forming white self-polymers. This affects the efficiency of subsequent reactions and drying, leading to incomplete reactions and impacting product quality.

[0006] To reduce self-polymerization in the degassing system, existing methods typically maintain the degassing regulating valve opening within a certain range, preventing it from reaching its maximum opening. This results in low degassing efficiency, long degassing time, and ultimately affects the output of polyvinyl chloride paste resin production workshops.

[0007] The purpose of this invention is to solve the problem of foam generation in polyvinyl chloride paste resin (EPVC) latex, which leads to severe self-polymerization in the equipment during degassing, resulting in low degassing efficiency and affecting production output. Summary of the Invention

[0008] To address the aforementioned problems, this utility model provides a degassing and separation device, including a degassing tank 1, a foam breaking device 2, and a feed pipe 3. The degassing tank 1 has an air inlet 12 and an air outlet 11 at the top, and a discharge outlet 13 at the bottom. The foam breaking device 2 is located on the air outlet 11 and has a material inlet 23, a material outlet 22, and a dosing port 24. An internal mixing device is provided to rapidly mix the reagent and the material. The material inlet 23 and the air outlet 11 are fixedly connected. The dosing port 24 is located on the foam breaking device 2 near the material outlet 22. The mixing device is located between the dosing port 24 and the material inlet 23. The feed pipe 3 is vertically installed inside the degassing tank 1, with its upper end connected to the air inlet 12 and its lower end extending towards the middle of the degassing tank 1.

[0009] In use, the air inlet 12 is connected to the gas pipeline, and the dosing port 24 is connected to the pipeline for conveying the foam-eliminating agent. The vinyl chloride gas (hereinafter referred to as the material) carrying foam enters the degassing tank 1 through the air inlet 12 for foam elimination. The material carrying a small amount of foam enters the shell through the material inlet 23, and the foam-eliminating agent (hereinafter referred to as the agent) enters the shell 21 through the dosing port 24. Under the action of the mixing device, the foam-eliminating agent is quickly dispersed into the vinyl chloride gas carrying foam and fully mixed, thereby quickly breaking the foam in the vinyl chloride gas. The clean vinyl chloride gas is discharged from the material outlet 22 and then recovered. The liquid carrying EPVC latex formed after the foam is broken is discharged from the discharge port 13 and then the EPVC latex is recovered.

[0010] This invention features a cylindrical housing 21 with a dosing port 24 on its side wall. Inside the housing 21 is a mixing device for rapid mixing of the agent and materials. When materials flow into the housing 21, the foam-eliminating agent is rapidly dispersed into the materials under the action of the mixing device, mixing thoroughly and quickly eliminating foam. By installing a feed pipe 3 connected to the air inlet 12 inside the degassing tank 1, liquid containing EPVC latex formed after foam breakage is prevented from being directly sucked out from the air outlet 11, improving the removal efficiency of EPVC latex from vinyl chloride gas. This invention solves the problem of foam generation in polyvinyl chloride paste resin (EPVC latex), leading to severe self-polymerization in the equipment during degassing, resulting in low degassing efficiency and reduced production.

[0011] Preferably, the lower end of the feed pipe 3 extends to two-thirds of the height inside the degassing tank 1. By extending the feed pipe 3 to two-thirds of the height inside the degassing tank 1, it is possible to prevent the liquid containing EPVC latex formed after the foam breaks from being directly sucked out from the outlet 11, thereby improving the effect of removing EPVC latex from the vinyl chloride gas. If the feed pipe 3 is too long, the vinyl chloride gas will not be able to be discharged from the outlet 11 in time, resulting in waste of vinyl chloride.

[0012] Preferably, the foam breaking device 2 includes a shell 21, which is cylindrical, with a material inlet 23 and a material outlet 22 formed at both ends, and a dosing port 24 formed on the side wall. The mixing device is a spiral distribution disc 4, which is set inside the shell 21 by a support device 5.

[0013] The spiral distribution disk 4 can block the vinyl chloride gas, reduce the flow rate, and cause some of the foam to break upon contact with the spiral distribution disk 4. This allows the vinyl chloride gas carrying foam to swirl and disperse with the foam-eliminating agent, thereby improving the efficiency and effectiveness of eliminating foam in the vinyl chloride gas.

[0014] Preferably, the support device 5 includes a pressure plate 51 and a guide rod 52. The pressure plate 51 is located outside the material outlet 22 and is pressed onto the material outlet 22. One end of the guide rod 52 is fixedly connected to the pressure plate 51 via a support rod 53, and the other end extends into the housing 21, with its end fixedly connected to the spiral distribution disc 4.

[0015] Preferably, the spiral distribution disk 4 includes a support ring 41 and a plurality of spiral guide vanes 42 disposed within the support ring 41. The inner diameter of the support ring 41 corresponds to the inner diameter of the housing 21 and is fitted inside the housing 21. The spiral guide vanes 42 are inclined and fixedly connected at one end to the support ring 41 and at the other end to the guide rod 52. The plurality of spiral guide vanes 42 are evenly arranged along the outer periphery of the guide rod 52.

[0016] Therefore, multiple spiral guide vanes 42 are set on the spiral distribution disk 4. When the material flows through the spiral distribution disk 4, the material flowing through the spiral distribution disk 42 is mixed with the agent added from the dosing port 24 by the dispersion and guiding effect of the spiral guide vanes 42, thereby improving the mixing efficiency and degree of mixing between the material and the agent, and improving the efficiency and effect of eliminating foam in the material.

[0017] Preferably, the foam breaking device 2 further includes a nozzle 6, which is disposed inside the housing 21 and fixedly connected to the dosing port 24 via a connecting pipe 61, with internal communication. The nozzle 6 can spray and disperse the agent into the material inside the housing 21, promoting the mixing degree between the agent and the material and improving the foam elimination effect.

[0018] Preferably, the nozzle 6 is located in the middle of the housing 21, and the nozzle of the nozzle 6 faces the spiral distribution disk 4. By setting the nozzle 6 in the middle of the housing 21 and making the nozzle of the nozzle 6 face the spiral distribution disk 4, the dispersion of the agent in the material is improved when the material flows through the spiral distribution disk 4, and the mixing speed of the agent and the material is further promoted.

[0019] Preferably, an inlet flange 26 is provided on the material inlet 23, and an outlet flange 25 is provided on the material outlet 22.

[0020] Preferably, a support 7 is provided at the bottom of the degassing tank 1. The support 7 includes multiple support legs 71, which are arranged vertically and whose upper ends are fixedly connected to the bottom of the degassing tank 1. Attached Figure Description

[0021] Figure 1 Schematic diagram of the overall structure of the degassing and separation unit;

[0022] Figure 2 Schematic diagram of the internal structure of the degassing tank;

[0023] Figure 3 Schematic diagram of the overall structure of the foam eliminator;

[0024] Figure 4 Schematic diagram of the internal structure of the foam eliminator;

[0025] Figure 5 Schematic diagram of the outlet end of the foam eliminator;

[0026] Figure 6 Schematic diagram of the feed inlet end of the foam eliminator.

[0027] In the diagram, 1. Degassing tank, 11. Air outlet, 12. Air inlet, 13. Discharge outlet, 2. Foam crushing device, 21. Shell, 22. Material outlet, 23. Material inlet, 24. Dosing port, 25. Outlet flange, 26. Inlet flange, 3. Feed pipe, 4. Spiral distribution disc, 41. Support ring, 42. Spiral guide vane, 5. Support device, 51. Pressure plate, 52. Guide rod, 53. Support rod, 6. Nozzle, 61. Connecting pipe, 7. Bracket, 71. Support leg. Detailed Implementation

[0028] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] This embodiment uses the process of producing polyvinyl chloride (PVC) paste resin from vinyl chloride monomer via micro-suspension as an example. After the EPVC latex reaction is complete, it is stored in a storage tank. When recovering unreacted vinyl chloride monomer (vinyl chloride gas) from the EPVC latex, the gaseous vinyl chloride monomer is extracted from the top of the storage tank using a vacuum pump and transported to this device through a conveying pipeline for vinyl chloride recovery. The structure of this device is described in detail below.

[0030] like Figure 1 and Figure 2 As shown, the degassing and separation device includes a degassing tank 1, a foam breaking device 2, and a feed pipe 3. The top of the degassing tank 1 is provided with an air inlet 12 and an air outlet 11, and the bottom is provided with a discharge outlet 13.

[0031] The bottom of the degassing tank 1 is provided with a bracket 7, which includes multiple support legs 71. The support legs 71 are arranged vertically and their upper ends are fixedly connected to the bottom of the degassing tank 1.

[0032] The feed pipe 3 is vertically installed inside the degassing tank 1, with its upper end connected to the air inlet 12 and its lower end extending to two-thirds of the height inside the degassing tank 1.

[0033] The feed pipe 3 can prevent the liquid containing EPVC latex formed after the foam breaks from being directly sucked out of the outlet 11, thus improving the effect of removing EPVC latex from the vinyl chloride gas. If the feed pipe 3 is too long, the vinyl chloride gas will not be able to be discharged from the outlet 11 in time, resulting in waste of vinyl chloride.

[0034] like Figure 3 and Figure 4 As shown, the foam breaking device 2 is installed on the air outlet 11 of the degassing tank 1, including a shell 21 and a nozzle 6. The shell 21 is cylindrical, with a material inlet 23 and a material outlet 22 formed at both ends, and a dosing port 24 formed on the side wall. A mixing device is installed inside to quickly mix the agent and the material.

[0035] An inlet flange 26 is provided on the material inlet 23, and an outlet flange 25 is provided on the material outlet 22. The inlet flange 25 on the material inlet 23 facilitates connection to the gas outlet 11 of the degassing tank 1, and the outlet flange 26 on the material outlet 22 facilitates connection between the equipment and the gas transmission pipeline, and also improves the strength and sealing of the connection.

[0036] The material inlet 23 and the air outlet 11 are fixedly connected.

[0037] The dosing port 24 is located at one end of the foam crushing device 2 near the material outlet 22. The spiral distribution disc 4 is located between the dosing port 24 and the material inlet 23.

[0038] In this embodiment, the mixing device is a spiral distribution disk 4, which is installed inside the housing 21 via a support device 5. The spiral distribution disk 4 allows the vinyl chloride gas carrying foam to be dispersed and mixed rapidly with the foam elimination agent (hereinafter referred to as the agent) through a swirling flow, thereby improving the efficiency and effectiveness of eliminating foam in the vinyl chloride gas.

[0039] The nozzle 6 is located inside the housing 21, in the middle of the housing 21. The nozzle of the nozzle 6 faces the spiral distribution disk 4. The nozzle 6 is fixedly connected to the dosing port 24 through the connecting pipe 61, and the interior is connected.

[0040] By setting the nozzle 6 and placing it in the middle of the housing 21, so that the nozzle of the nozzle 6 faces the spiral distribution disk 4, the dispersion of the foam-eliminating agent in the vinyl chloride gas is improved when the vinyl chloride gas flows through the spiral distribution disk 4, thereby improving the foam breaking efficiency.

[0041] like Figure 4 and Figure 5 As shown, the support device 5 includes a pressure plate 51 and a guide rod 52. The pressure plate 51 is located outside the material outlet 22 and is pressed onto the material outlet 22. One end of the guide rod 52 is fixedly connected to the pressure plate 51 through a support rod 53, and the other end extends into the housing 21, with its end fixedly connected to the spiral distribution plate 4.

[0042] like Figure 4 and Figure 6 As shown, the spiral distribution disk 4 includes a support ring 41 and twelve spiral guide vanes 42 disposed within the support ring 41. The inner diameter of the support ring 41 corresponds to the inner diameter of the housing 21 and is fitted inside the housing 21.

[0043] The spiral guide vane 42 is inclined, with one end fixedly connected to the support ring 41 and the other end fixedly connected to the guide rod 52. Multiple spiral guide vanes 42 are evenly arranged along the outer circumference of the guide rod 52.

[0044] The spiral distribution disk 4 can block vinyl chloride gas, reduce the flow rate, and cause some foam to break upon contact with the spiral distribution disk 4. Multiple spiral guide vanes 42 are set on the spiral distribution disk 4. When the material flows through the spiral distribution disk 4, the material flowing through the spiral distribution disk 4 is mixed with the agent added from the dosing port 24 through the dispersion and guiding effect of the spiral guide vanes 42, thereby improving the mixing efficiency and degree of mixing between the material and the agent, and improving the efficiency and effect of eliminating foam in the material.

[0045] In use, the air inlet 12 is connected to the gas pipeline, and the dosing port 24 is connected to the pipeline for conveying the foam-eliminating agent. The vinyl chloride gas carrying foam enters the degassing tank 1 through the air inlet 12 for foam elimination. The vinyl chloride gas carrying a small amount of foam enters the shell through the material inlet 23. The foam-eliminating agent enters the shell 21 through the dosing port 24. Some of the foam in the vinyl chloride gas is broken after impacting the spiral distribution disk 4. Under the action of the spiral distribution disk 4, the foam-eliminating agent is quickly dispersed into the vinyl chloride gas and fully mixed, thereby quickly breaking the remaining foam in the vinyl chloride gas. The clean vinyl chloride gas is discharged from the material outlet 22 and then recovered. The liquid containing EPVC latex formed after the foam is broken is discharged from the discharge port 13 and the EPVC latex is recovered.

[0046] This invention features a cylindrical housing 21 with a dosing port 24 on its side wall. Inside the housing 21 is a mixing device for rapid mixing of the agent and materials. When materials flow into the housing 21, the foam-eliminating agent is rapidly dispersed into the materials under the action of the mixing device, mixing thoroughly and quickly eliminating foam. Furthermore, by providing a feed pipe 3 connected to the air inlet 12 inside the degassing tank 1, the liquid containing EPVC latex formed after foam breakage is prevented from being directly drawn out from the air outlet 11, thus improving the removal of EPVC latex from vinyl chloride gas.

[0047] By setting nozzle 6 in the middle of housing 21, with its nozzle facing the spiral distribution disk 4, the dispersion of the foam-eliminating agent in the vinyl chloride gas is improved as the vinyl chloride gas flows through the spiral distribution disk 4, thus increasing the foam breaking efficiency. The spiral distribution disk 4 inside housing 21 also obstructs the vinyl chloride gas, reducing its flow rate and causing some foam to break upon contact with the disk. This allows the vinyl chloride gas carrying foam to swirl and disperse with the foam-eliminating agent, rapidly mixing and further improving the efficiency and effectiveness of eliminating foam in the vinyl chloride gas.

[0048] It should be noted that the above embodiments are illustrative of the present invention and not intended to limit the present invention.

Claims

1. A degassing and separation device, characterized in that, It includes a degassing tank (1), a foam breaking device (2), and a feed pipe (3). The degassing tank (1) is provided with an air inlet (12) and an air outlet (11) at the top and a discharge outlet (13) at the bottom. The foam breaking device (2) is located on the air outlet (11). The foam breaking device (2) is provided with a material inlet (23), a material outlet (22) and a dosing port (24). Inside, there is a mixing device that allows the agent and the material to mix quickly. The material inlet (23) and the air outlet (11) are fixedly connected; The dosing port (24) is located at one end of the foam breaking device (2) near the material outlet (22); The mixing device is located between the dosing port (24) and the material inlet (23); The feed pipe (3) is vertically arranged inside the degassing tank (1), with its upper end connected to the air inlet (12) and its lower end extending towards the middle of the degassing tank (1).

2. The degassing and separation device according to claim 1, characterized in that, The lower end of the feed pipe (3) extends to two-thirds of the height inside the degassing tank (1).

3. The degassing and separation device according to claim 2, characterized in that, The foam breaking device (2) includes a housing (21). The shell (21) is cylindrical, with a material inlet (23) and a material outlet (22) formed at both ends, and a dosing port (24) formed on the side wall. The mixing device is a spiral distribution disk (4); The spiral distribution disk (4) is mounted inside the housing (21) by a support device (5).

4. The degassing and separation device according to claim 3, characterized in that, The support device (5) includes a pressure plate (51) and a guide rod (52). The pressure plate (51) is located outside the material outlet (22) and is pressed onto the material outlet (22); One end of the guide rod (52) is fixedly connected to the pressure plate (51) via the support rod (53), and the other end extends into the interior of the housing (21), with the end fixedly connected to the spiral distribution plate (4).

5. The degassing and separation device according to claim 4, characterized in that, The spiral distribution disk (4) includes a support ring (41) and multiple spiral guide vanes (42) disposed within the support ring (41). The inner diameter of the support ring (41) corresponds to the inner diameter of the shell (21) and is fitted inside the shell (21); The spiral guide vane (42) is inclined, with one end fixedly connected to the support ring (41) and the other end fixedly connected to the guide rod (52); Multiple spiral guide vanes (42) are evenly arranged along the outer periphery of the guide rod (52).

6. The degassing and separation device according to claim 5, characterized in that, The foam breaking device (2) also includes a nozzle (6). The nozzle (6) is located inside the housing (21) and is fixedly connected to the dosing port (24) via a connecting pipe (61), with internal communication.

7. The degassing and separation device according to claim 6, characterized in that, The nozzle (6) is located in the middle of the housing (21), and the nozzle of the nozzle (6) faces the spiral distribution disk (4).

8. The degassing and separation device according to claim 7, characterized in that, An inlet flange (26) is provided on the material inlet (23); An outlet flange (25) is provided on the material outlet (22).

9. The degassing and separation apparatus according to any one of claims 1 to 8, characterized in that, The bottom of the degassing tank (1) is provided with a support (7). The bracket (7) includes multiple support legs (71); The support leg (71) is vertically arranged and its upper end is fixedly connected to the bottom of the degassing tank (1).

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