A polymer sedimentation separation system
By separating light and heavy phases and small molecule polymers using a settling tank system, the problem of low centrifuge efficiency in polymerization reactions is solved, achieving efficient separation and improved product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIAOCHENG LUXI POLYCARBONATE CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-26
AI Technical Summary
In the polymer solution generated by the polymerization reaction, the proportion of water in the light phase is high, resulting in low centrifuge separation efficiency, which cannot effectively separate small molecule polymers and affects the product strength and appearance quality.
A settling tank system is used for light and heavy phase separation. The boundary line is observed using structured corrugated packing and a sight glass. Small molecule polymers are separated, and the feed rate to the centrifuge is reduced, thereby improving the centrifuge efficiency.
It effectively separates small molecule polymers, reduces centrifuge load, improves separation efficiency, avoids degradation of small molecules at high temperatures, and improves product quality.
Smart Images
Figure CN224270269U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polymer solution separation technology, and in particular to a polymer sedimentation separation system. Background Technology
[0002] Polycarbonate (engineering plastic) is produced by polymerization in a polymerization system. The resulting polymer solution is then pumped to a polymer washing centrifugal separation system for separation, where water and impurities are separated from the polymer. The centrifuge works by separating the lighter phase and impurities from the solution based on the density differences of the components in the solution.
[0003] Then, in the polymer solution generated by the polymerization reaction system of polycarbonate (engineering plastic) in the production process, the proportion of water in the light phase is about 50%, which increases the separation load of the centrifuge, reduces the separation efficiency, and reduces the processing capacity of the centrifuge system. Moreover, during the centrifugation process, small molecule polymers cannot be effectively separated by the centrifuge, and in the later processing, small molecule materials will degrade and yellow at high temperatures, which seriously affects the strength and appearance quality of the product. Utility Model Content
[0004] This invention provides a polymer sedimentation separation system that overcomes the technical problems of low centrifuge processing efficiency and inability to effectively separate small molecule polymers. By performing light and heavy phase separation on the polymer solution in advance, the feed amount of the centrifuge is effectively reduced, the operating efficiency of the centrifuge is improved, and small molecules in the polymer can be separated and removed.
[0005] This utility model is achieved through the following technical solution:
[0006] A polymer sedimentation separation system includes a sedimentation tank, which is a closed tank. The upper part of the sedimentation tank is provided with light phase structured packing and the lower part is provided with heavy phase structured packing.
[0007] The settling tank is connected to a light phase outlet pipeline at the top and a heavy phase outlet pipeline at the bottom.
[0008] The sidewall of the settling tank is connected to a polymer solution feed line and a small molecule polymer outlet line between the light phase structured packing and the heavy phase structured packing.
[0009] The end of the small molecule polymer outlet pipe is equipped with a sight glass that allows observation of the inside of the settling tank. The side wall of the small molecule polymer outlet pipe is sequentially connected to a switch valve, a small molecule polymer discharge pipeline, and a defective product collection tank.
[0010] Furthermore, both the light-phase structured packing and the heavy-phase structured packing are structured corrugated packings, and the settling tank is equipped with a metal support frame for supporting the structured corrugated packing.
[0011] Furthermore, a heavy phase delivery pump is provided on the heavy phase outlet pipeline, and a solution delivery pump is connected to the other end of the polymer solution feed pipeline.
[0012] Furthermore, the connection point between the small molecule polymer outlet pipeline and the settling tank is located at 1 / 2 of the height of the side wall of the settling tank.
[0013] Furthermore, there are two settling tanks, and the light phase outlet pipelines of the two settling tanks are connected in parallel to the light phase recovery system; the small molecule polymer outlet pipelines of the two settling tanks are connected in parallel to the defective product collection tank.
[0014] The beneficial effects achieved by this utility model compared with the prior art are as follows:
[0015] 1. Before entering the centrifuge system, the polymer solution generated by the polymerization system reaction first enters the polymer sedimentation separation system described in this utility model. The polymer solution is slowly transported to the sedimentation tank by the solution transfer pump. Due to the difference in density, the light phase and heavy phase in the polymer solution are separated into layers in the sedimentation tank, with the light phase on the upper layer and the heavy phase polymer on the lower layer. Small molecule polymers in the polymer accumulate at the boundary between the light and heavy phases. The light phase in the sedimentation tank is transported to the light phase treatment system through the light phase outlet pipeline at the top of the sedimentation tank by the transport pressure of the solution transfer pump. The heavy phase polymer is transported to the centrifuge system through the light phase outlet pipeline at the bottom of the sedimentation tank for water washing and separation to remove impurities and residual water from the polymer. The small molecule polymers at the boundary between the light and heavy phases are transported to the defective product recovery system through the small molecule polymer outlet pipeline to separate and remove the small molecules in the polymer.
[0016] By using this utility model, the feed amount of the centrifuge will be effectively reduced, the operating efficiency and washing effect of the centrifuge will be improved, and small molecules in the polymer can be removed to prevent small molecule polymers from entering the subsequent material processing system and degrading during high-temperature processing, which would affect the strength and appearance quality of the product.
[0017] 2. Both light phase structured packing and heavy phase structured packing are structured corrugated packings, which can effectively slow down the flow rate of light and heavy phases and help to separate the light and heavy phases better.
[0018] 3. Install a sight glass on the outlet pipeline of the small molecule polymer. The small molecule polymerization situation at the boundary between the light and heavy phases in the settling tank can be determined through the sight glass. Attached Figure Description
[0019] Figure 1This is a schematic diagram of the polymer sedimentation separation system described in Example 1;
[0020] Figure 2 This is a schematic diagram of the polymer sedimentation separation system described in Example 2;
[0021] In the diagram: 1. Polymer solution feed line, 2. Settling tank, 3. Light phase structured packing, 4. Heavy phase structured packing, 5. Heavy phase outlet line, 6. Light phase outlet line, 7. Small molecule polymer discharge line, 8. Defective product collection tank, 9. Sight glass, 10. Solution transfer pump, 11. Heavy phase transfer pump. Detailed Implementation
[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0023] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", 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 the 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 limitations on the utility model.
[0024] Example 1
[0025] like Figure 1 As shown, this embodiment discloses a polymer sedimentation separation system, mainly including a sedimentation tank 2, a heavy phase transfer pump 11, a solution transfer pump 10, and a defective product collection tank 8. The sedimentation tank 2 is a sealed tank. Light phase structured packing 3 is installed in the upper part of the sedimentation tank 2 via a metal support frame, and heavy phase structured packing 4 is installed in the lower part via a metal support frame. In this embodiment, both the light phase structured packing 3 and the heavy phase structured packing 4 are structured corrugated packings, which can effectively slow down the flow rate of the light and heavy phases, thus facilitating better separation of the light and heavy phases.
[0026] A light phase outlet pipeline 6 is connected to the top of the settling tank 2, and a heavy phase outlet pipeline 5 is connected to the bottom of the settling tank 2. The other end of the heavy phase outlet pipeline 5 is connected to the centrifuge system, and a heavy phase transfer pump 11 is installed on the heavy phase outlet pipeline 5.
[0027] A polymer solution inlet pipeline 1 and a small molecule polymer outlet pipeline are connected to the side wall of the settling tank 2, respectively. The polymer solution inlet pipeline 1 and the small molecule polymer outlet pipeline are located between the light phase structured packing 3 and the heavy phase structured packing 4. The other end of the polymer solution inlet pipeline 1 is connected to a solution transfer pump 10. In most cases, after the polymer solution enters the settling tank, the boundary between the light phase and the heavy phase is located slightly below 1 / 2 the height of the settling tank 2. Therefore, in this embodiment, the connection point between the small molecule polymer outlet pipeline and the settling tank 2 is at 1 / 2 the height of the settling tank 2. A sight glass 9 that allows observation of the interior of the settling tank 2 is installed at the end of the small molecule polymer outlet pipeline. The side wall of the small molecule polymer outlet pipeline is connected in sequence to a switch valve, a small molecule polymer discharge pipeline 7, and a defective product collection tank 8.
[0028] The specific working process of the polymer sedimentation separation system described in this embodiment is as follows:
[0029] The polymer solution is slowly pumped to the settling tank 2 by the solution transfer pump 10. Due to their different densities, the light and heavy phases in the polymer solution are separated into layers in the settling tank 2. The light phase structured packing 3 and heavy phase structured packing 4 in the settling tank 2 can effectively slow down the flow rate of the light and heavy phases, which helps to separate the light and heavy phases better. The light phase is on the upper layer and the heavy phase polymer is on the lower layer. The settled heavy phase polymer is transported to the downstream centrifuge system through the heavy phase outlet pipeline 5. When the settling tank 2 is full of material, the upper light phase is transported to the light phase recovery system through the gas phase outlet pipeline and with the pressure provided by the polymer solution feed pipeline 1. The boundary between the heavy and light phases in the settling tank 2 is a small molecule polymer (there is a clear boundary between the separated light and heavy phases. The heavy phase is milky white and the light phase is colorless. The closer to the boundary, the smaller the molecular weight of the heavy phase liquid). When too much small molecule polymer is aggregated, it will form cotton-like particles. The condition of small molecule polymers at the boundary between the gas phase and the heavy phase can be observed through the sight glass 9. When too much polymers accumulate, the conveying speed of the heavy phase transfer pump 11 is reduced, the boundary between the light and heavy phases is raised, and the boundary reaches the position of the small molecule polymer outlet pipe. The switch valve is opened, and the small molecule polymers are transferred to the defective product collection tank 8 through the small molecule polymer discharge pipeline 7. The solution in the small molecule polymer discharge pipeline 7 is sampled and analyzed. When the relevant requirements are met, the switch valve is closed, and the conveying speed of the heavy phase transfer pump is restored.
[0030] The above solution will effectively reduce the feed amount of the centrifuge, improve the operating efficiency and washing effect of the centrifuge, and remove small molecules from the polymer, preventing small molecule polymers from entering the subsequent material processing system and degrading during high-temperature processing, thus affecting the strength and appearance quality of the product.
[0031] Example 2
[0032] To increase the rate of sedimentation and stratification, such as Figure 2 This embodiment discloses a polymer sedimentation separation system, mainly comprising two sedimentation tanks 2, which are used in parallel to improve processing efficiency. The light phase outlet pipelines 6 of the two sedimentation tanks 2 are connected in parallel to the light phase recovery system, and the small molecule polymer outlet pipelines of the two sedimentation tanks 2 are connected in parallel to the defective product collection tank 8. Its working principle is the same as that of Embodiment 1, and will not be described in detail here.
[0033] The above scheme enables the simultaneous sedimentation and separation of polymer solutions using two sedimentation tanks 2, greatly improving work efficiency.
Claims
1. A polymer sedimentation separation system, comprising a sedimentation tank, characterized in that, The settling tank is a closed tank, and the upper part of the settling tank is equipped with light phase structured packing and the lower part is equipped with heavy phase structured packing. The settling tank is connected to a light phase outlet pipeline at the top and a heavy phase outlet pipeline at the bottom. The sidewall of the settling tank is connected to a polymer solution feed line and a small molecule polymer outlet line between the light phase structured packing and the heavy phase structured packing. The end of the small molecule polymer outlet pipe is equipped with a sight glass that allows observation of the inside of the settling tank. The side wall of the small molecule polymer outlet pipe is sequentially connected to a switch valve, a small molecule polymer discharge pipeline, and a defective product collection tank.
2. The polymer sedimentation separation system according to claim 1, characterized in that, Both the light-phase structured packing and the heavy-phase structured packing are structured corrugated packings, and the settling tank is equipped with a metal support frame for supporting the structured corrugated packing.
3. The polymer sedimentation separation system according to claim 1, characterized in that, The heavy phase outlet pipeline is equipped with a heavy phase transfer pump, and the other end of the polymer solution inlet pipeline is connected to a solution transfer pump.
4. The polymer sedimentation separation system according to claim 1, characterized in that, The connection point between the small molecule polymer outlet pipeline and the settling tank is located at 1 / 2 of the height of the side wall of the settling tank.
5. The polymer sedimentation separation system according to any one of claims 1-4, characterized in that, The settling tanks are of two types, and the light phase outlet pipelines of the two settling tanks are connected in parallel to the light phase recovery system; the small molecule polymer outlet pipelines of the two settling tanks are connected in parallel to the defective product collection tank.