A system for solving the problem of butadiene's tendency to polymerize in dead zones of system pipelines

Abstract

This invention provides a system for solving the problem of butadiene polymerization easily occurring in dead zones of system pipelines, belonging to the field of butadiene production technology. It solves the problems of butadiene polymerization easily occurring in dead zones of system pipelines, leading to pipeline blockage, in existing technologies. It includes: a light-light product removal tower; a butadiene product pump, the inlet of which is connected to the bottom of the light-light product removal tower to transport butadiene material treated by the light-light product removal tower; a first reboiler, connected to the bottom of the heavy-light product removal tower via a first pipeline and connected to the reflux end of the bottom of the heavy-light product removal tower via a second pipeline; a third pipeline connected to the second pipeline, wherein a first safety valve is installed at the end of the third pipeline, and the area between the first safety valve and the second pipeline forms a first easily blocked area; and a first flushing pipeline, one end connected to the outlet of the butadiene product pump, and the other end connected between the first easily blocked area and the first safety valve. This invention has the advantages of high efficiency and automation.

Description

Technical Field

[0001] This utility model relates to the field of butadiene production technology, specifically to a system for solving the problem of butadiene easily polymerizing in the dead zone of the system pipeline. Background Technology

[0002] Butadiene, as an important basic raw material in the petrochemical industry, is widely used in the production of various chemical products such as synthetic rubber, synthetic resins, and nylon. In butadiene production and subsequent purification systems, due to the high reactivity of the butadiene molecule, polymerization reactions readily occur in dead zones of the system pipelines, such as the area between safety valves and connecting lines.

[0003] In these dead zones, where the medium flows slowly or even stagnates, butadiene molecules can easily combine to form polymers under certain temperature and pressure conditions. Over time, these polymers accumulate in the dead zones, causing not only pipeline blockages and affecting the normal flow of the system, but also, in severe cases, preventing safety valves from functioning properly and losing their safety protection function, posing a significant safety hazard to the entire butadiene production system. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies where butadiene is prone to polymerization in the dead zone of the system pipeline, leading to pipeline blockage and affecting the safe operation of the system, and to provide a system that solves the problem of butadiene being prone to polymerization in the dead zone of the system pipeline.

[0005] This utility model can be achieved through the following technical solutions:

[0006] A system for addressing the tendency of butadiene to polymerize in dead zones of system pipelines, comprising:

[0007] Light component removal tower, used to separate light components such as propyne from crude butadiene;

[0008] The butadiene product pump has its inlet connected to the bottom of the light-light ...

[0009] The first reboiler is connected to the bottom of the de-burden tower via a first pipeline and to the reflux end of the bottom of the de-burden tower via a second pipeline;

[0010] The third pipeline is connected to the second pipeline, and a first safety valve is installed at the end of the third pipeline. The area between the first safety valve and the second pipeline forms a first easily blocked area.

[0011] The first flushing pipeline is connected at one end to the outlet of the butadiene product pump and at the other end between the first easily clogged area and the first safety valve.

[0012] The system described above, which addresses the issue of butadiene polymerization in the dead zone of the system pipeline, also includes a heavy removal tower, which is connected to the feed inlet of the light removal tower via a fourth pipeline.

[0013] In the above-mentioned system for solving the problem of butadiene polymerization in the dead zone of the system pipeline, the de-weighting tower is equipped with a second reboiler and a second reflux tank. The second reboiler is connected to the bottom of the de-weighting tower through a fifth pipeline and to the reflux end of the bottom of the de-weighting tower through a sixth pipeline.

[0014] The second reflux tank is connected to the top of the heavy removal tower via the seventh pipeline and to the reflux end of the top of the heavy removal tower via the eighth pipeline. One end of the fourth pipeline is connected to the eighth pipeline, and the other end is connected to the light removal tower.

[0015] The light-weight removal tower is also equipped with a first reflux tank, which is connected to the top of the light-weight removal tower via a ninth pipeline and to the reflux end of the top of the light-weight removal tower via a tenth pipeline.

[0016] In the above-mentioned system for solving the problem of butadiene's easy polymerization in the dead zone of the system pipeline, an eleventh pipeline is also included. One end of the eleventh pipeline is connected to the sixth pipeline, and a second safety valve is provided at the end of the eleventh pipeline. The area between the second safety valve and the sixth pipeline forms a second easily blocked area.

[0017] It also includes a twelfth pipeline, one end of which is connected to the seventh pipeline, and a third safety valve is provided at the end of the twelfth pipeline. The area between the second safety valve and the seventh pipeline forms a third easily blocked area.

[0018] It also includes a thirteenth pipeline, one end of which is connected to the ninth pipeline, and a fourth safety valve is provided at the end of the thirteenth pipeline. The area between the fourth safety valve and the ninth pipeline forms a fourth easily blocked area.

[0019] The system described above, which addresses the issue of butadiene polymerization in dead zones of the system pipeline, also includes a second flushing pipeline, one end of which is connected to the fourth pipeline, and the other end is connected between the second easily clogged area and the second safety valve.

[0020] The system described above, which addresses the issue of butadiene polymerization in dead zones of the system pipeline, also includes a third flushing pipeline, with one end connected to the second flushing pipeline and the other end connected between the third easily clogged area and the third safety valve.

[0021] The system described above, which addresses the issue of butadiene polymerization in dead zones of the system pipeline, also includes a fourth flushing pipeline, with one end connected to the tenth pipeline and the other end connected between the fourth easily clogged area and the fourth safety valve.

[0022] In the aforementioned system designed to address the issue of butadiene polymerization in dead zones of the pipeline, pressure relief valves are installed in the first, second, third, and fourth easily clogged areas.

[0023] In the aforementioned system designed to address the issue of butadiene polymerization in dead zones of the pipeline, a bypass is connected to each of the first, second, third, and fourth easily clogged areas.

[0024] In the aforementioned system designed to address the issue of butadiene polymerization in dead zones of the pipeline, a monitoring device is installed before each of the first, second, third, and fourth safety valves.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] The system provided by this invention addresses the problem of butadiene polymerization in dead zones of system pipelines. By setting up multiple flushing pipelines to flush each easily clogged area, the butadiene material in the easily clogged area remains in a flowing state, fundamentally solving the problem of butadiene polymerization in dead zones of system pipelines. This effectively avoids pipeline blockage, ensures the normal operation of safety valves, and improves the safety and stability of the entire butadiene production system.

[0027] Meanwhile, the system is equipped with monitoring devices, which further improves the system's safety assurance system, enhances the continuity and reliability of system operation, reduces the failure rate and maintenance costs in the production process, and has significant economic and social benefits. It can be widely used in the field of butadiene production and purification. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a system according to the present invention for solving the problem of butadiene easily polymerizing in the dead zone of the system pipeline.

[0029] In the diagram, 1. Light weight removal tower; 2. Butadiene product pump; 3. First reboiler; 4. Third pipeline; 5. First flushing pipeline; 6. First safety valve; 7. First easily clogged area; 8. Heavy weight removal tower; 9. Fourth pipeline; 10. Second reboiler; 11. Second reflux tank; 12. Fifth pipeline; 13. Sixth pipeline; 14. Seventh pipeline; 15. Eighth pipeline; 16. First reflux tank; 17. Ninth pipeline; 18. Tenth pipeline; 19. 11th pipeline; 20. Second safety valve; 21. Second clogged area; 22. Twelfth pipeline; 23. Third safety valve; 24. Third clogged area; 25. Thirteenth pipeline; 26. Fourth safety valve; 27. Fourth clogged area; 28. Second flushing pipeline; 29. ​​Third flushing pipeline; 30. Fourth flushing pipeline; 31. Pressure relief valve; 32. Bypass; 33. Monitoring device; 34. First pipeline; 35. Second pipeline. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] like Figure 1 As shown, this utility model provides a system for solving the problem of butadiene easily polymerizing in dead zones of system pipelines, comprising:

[0033] The system includes a light component removal tower 1, a butadiene product pump 2, a first reboiler 3, a third pipeline 4, a first safety valve 6, and a first flushing pipeline 5. Among these, the light component removal tower 1, as the core of butadiene feedstock pretreatment, primarily functions to separate the light components from the feedstock, providing a more stable material base for the system.

[0034] The inlet of the butadiene product pump 2 is directly connected to the bottom of the light-light-removal tower 1, which can efficiently transport butadiene material after being processed by the light-light-removal tower 1. At the same time, its outlet provides power support for the anti-clogging process and is a key node for material circulation within the system.

[0035] The first reboiler 3 is connected to the bottom of the de-weighting tower 8 via the first pipeline 34, and is also connected to the reflux end of the bottom of the de-weighting tower 8 via the second pipeline 35, which can realize the heating and circulation of the material at the bottom of the de-weighting tower 8.

[0036] The third pipeline 4 connects to the second pipeline 35, and a first safety valve 6 is installed at its end. The area between the first safety valve 6 and the second pipeline 35 forms the first easily clogged area 7. Because this area is located at the branch end of the reboiler reflux pipeline, the material does not flow, making it highly susceptible to butadiene stagnation polymerization. To solve this problem, the system is specially equipped with a first flushing pipeline 5, one end of which is connected to the outlet of the butadiene product pump 2, and the other end is connected between the first easily clogged area 7 and the first safety valve 6. This allows the high-pressure, low-impurity butadiene delivered by the butadiene product pump 2 to be introduced into the first easily clogged area 7. When polymerization occurs in this area, the flushing pipeline is opened, while the first safety valve 6 is closed. The flushing pipeline keeps the material in this area in a dynamic flow state, flowing into the second pipeline 35, preventing the polymerization reaction from continuing in this area and causing the third pipeline 4 to become clogged.

[0037] Preferably, this system further improves the butadiene purification process by adding a heavy component removal tower 8 and supporting separation and reflux components. The heavy component removal tower 8, as the core of heavy component separation, is connected to the feed inlet of the light component removal tower 1 via the fourth pipeline 9, allowing for the pretreatment of heavy components in the butadiene raw material. The system is equipped with a second reboiler 10 and a second reflux tank 11: the second reboiler 10 is connected to the bottom of the heavy component removal tower 8 via the fifth pipeline 12 and to the reflux end of the bottom of the heavy component removal tower 8 via the sixth pipeline 13, enabling heating and circulation of the material at the bottom of the heavy component removal tower 8; the second reflux tank 11 is connected to the top of the heavy component removal tower 8 via the seventh pipeline 14 and to the reflux end of the top of the heavy component removal tower 8 via the eighth pipeline 15, condensing the gaseous material discharged from the top of the heavy component removal tower 8. Part of this condenses back to the top of the heavy component removal tower 8 via the eighth pipeline 15 to maintain the distillation balance within the tower, while the other part provides qualified material for subsequent processes. It is worth noting that one end of the fourth pipeline 9 is connected to the eighth pipeline 15, and the other end is connected to the light component removal tower 1. This connection method allows the low-weight components processed by the second reflux tank 11 to be transported to the light component removal tower 1. The light component removal tower 1 is also equipped with a first reflux tank 16 to ensure the separation effect. The first reflux tank 16 is connected to the top of the light component removal tower 1 through the ninth pipeline 17 and to the reflux end of the top of the light component removal tower 1 through the tenth pipeline 18. It can condense the light components at the top of the light component removal tower 1, and some of the light components are refluxed back to the top of the light component removal tower 1 through the tenth pipeline 18.

[0038] Preferably, based on the above system, this system also adds three branch pipelines (eleventh pipeline, twelfth pipeline, and thirteenth pipeline) and matching safety valves.

[0039] Preferably, one end of the eleventh pipeline 19 is connected to the sixth pipeline 13, and the second safety valve 20 installed at its end is mainly used to deal with the overpressure risk of the sixth pipeline 13 and the second reboiler 10. However, due to the naturally low material flow rate of the branch pipeline, the area between the second safety valve 20 and the sixth pipeline 13 forms a second easily blocked area 21. The material in this area is prone to slowing down or even stagnating due to the slowed flow rate, becoming a new risk point for butadiene polymerization. If not controlled in time, polymer accumulation will directly affect the normal opening of the second safety valve 20 and threaten the operational safety of the bottom of the deweighting tower 8.

[0040] Preferably, the system is equipped with a twelfth pipeline 22, one end of which is connected to the seventh pipeline 14. The seventh pipeline 14 transports the gaseous material from the top of the deweighting tower 8 to the second reflux tank 11. Here, the material is in a transitional state from gas to liquid phase, and the flow rate and pressure are prone to fluctuation. The third safety valve 23 at the end of the twelfth pipeline 22 is used to deal with the risk of overpressure. However, the area between the third safety valve 23 and the seventh pipeline 14 forms a third easily blocked area 24.

[0041] Preferably, to ensure the safe operation of the top of the light component removal tower 1, the system is equipped with a thirteenth pipeline 25, one end of which is connected to the ninth pipeline 17. The ninth pipeline 17 is responsible for conveying the light component material from the top of the light component removal tower 1 to the first reflux tank 16. Here, the material needs to undergo gas-liquid separation through condensation, and the flow rate is relatively slow. The fourth safety valve 26 at the end of the thirteenth pipeline 25 is used to deal with overpressure problems in the ninth pipeline 17 or the first reflux tank 16, and the area between the fourth safety valve 26 and the ninth pipeline 17 forms a fourth easily blocked area 27.

[0042] Preferably, in order to specifically address the butadiene polymerization problem in the second, third, and fourth easily clogged areas, the system adds three dedicated flushing pipelines to construct an anti-polymerization flushing network covering the critical dead zones, with each flushing pipeline matched to the corresponding material source and easily clogged area.

[0043] Preferably, to address the polymerization risk in the second easily clogged area 21, the system is equipped with a second flushing pipeline 28, one end of which is connected to the fourth pipeline 9, and the other end is connected between the second easily clogged area 21 and the second safety valve 20. When polymerization occurs in the material within the second easily clogged area 21, the second flushing pipeline 28 can introduce low-weight butadiene into the area, pushing the material within the area to flow towards the sixth pipeline 13, breaking the stagnant state of the material, preventing butadiene polymerization and accumulation from the source, and simultaneously avoiding interference with the static standby state of the second safety valve 20.

[0044] Preferably, for the third easily blocked area 24, the system sets up a third flushing pipeline 29, one end of which is connected to the second flushing pipeline 28, and the other end extends between the third easily blocked area 24 and the third safety valve 23. The low- and high-component materials in the second flushing pipeline 28 match the material components in the third easily blocked area 24. The third flushing pipeline 29 takes materials from the second flushing pipeline 28 and realizes the transportation of flushing materials through the pipeline pressure difference, ensuring that the butadiene in the third easily blocked area 24 is always in a dynamically updated state and preventing polymer blockage.

[0045] Preferably, for the fourth easily blocked area 27, the system is equipped with a fourth flushing pipeline 30, one end of which is connected to the tenth pipeline 18, and the other end is connected between the fourth easily blocked area 27 and the fourth safety valve 26. Introducing it into the fourth easily blocked area 27 can fuse with the butadiene materials in the area, promote the mixed materials to flow towards the ninth pipeline 17, eliminate material stagnation and thus prevent blockage.

[0046] It is worth mentioning that after the polymer blocks the easily blocked area, the main pipeline materials cannot smoothly enter the pipeline before the safety valve, which will cause the pressure before the safety valve to be lower than the normal system pressure, resulting in the safety valve not being able to jump in time when the pressure exceeds the limit, the pressure cannot be transmitted to the safety valve, and the safety protection function is lost. When the first easily blocked area 7 blocks the third pipeline 4 due to polymerization, the materials transported by the butadiene product pump 2 are difficult to enter the third pipeline 4 through the second pipeline 35, which will cause the pressure before the first safety valve 6 to continue to be lower than the normal operating pressure at the bottom of the deweighting tower 8. Similarly, when the second easily blocked area 21 blocks the eleventh pipeline 19, the circulating materials in the sixth pipeline 13 cannot enter the eleventh pipeline 19, and the pressure before the second safety valve 20 will be lower than the reflux pressure at the bottom of the deweighting tower 8. Similar problems of inaccurate pressure before the safety valve will also occur when the third and fourth easily blocked areas 24 and 27 are blocked.

[0047] Preferably, a monitoring device 33 is installed in front of each safety valve. In this example, a bursting disc is used. It can monitor through abnormal pressure fluctuations. When the easily blocked area is not blocked and the system is operating normally, the bursting disc is in a stable state; if blockage occurs and the pressure before the safety valve continues to be lower than the set value, the operation and maintenance personnel can find the abnormal pressure through the pressure sensing component of the bursting disc, timely judge that there is polymerization blockage in the easily blocked area, and then open the corresponding flushing pipeline for dredging to avoid further blockage leading to pipeline rupture. This design further strengthens the system's prevention and control ability for the polymerization risk in the dead zone.

[0048] Preferably, the system is equipped with pressure relief valves 31 in the first easily clogged area 7, the second easily clogged area 21, the third easily clogged area 24, and the fourth easily clogged area 27, and each is connected to a bypass 32. The bypass 32 can perform pressure relief function, forming a double pressure relief protection with the pressure relief valves 31, further strengthening the pressure safety defense line of the easily clogged areas. At the same time, the flushing pipeline of the corresponding clogged area is connected to the bypass through a branch, which plays a role in flushing the bypass and preventing the bypass from becoming clogged.

[0049] Preferably, a pressure gauge is installed in the middle of the light-weight removal tower 1 to monitor pressure changes in real time, and a remote level gauge is installed in the tower bottom to monitor the liquid level in real time. Similarly, a pressure gauge is installed in the middle of the heavy-weight removal tower 8, and a remote level gauge is installed in the tower bottom. A branch line is added to the second flushing line 28, with its end connected to the root of the pressure gauge and remote level gauge in the heavy-weight removal tower 8. The material flowing in the second flushing line 28 flushes the root interface, preventing butadiene from polymerizing in the dead zone at the interface and causing monitoring distortion. A branch line is also installed on the first flushing line 5, with its end connected to the root of the pressure gauge and remote level gauge in the light-weight removal tower 1. The material flow in the first flushing line 5 flushes the potential dead zone at the root interface of the light-weight removal tower 1, avoiding inaccurate detection data due to root blockage. At the same time, each branch line is equipped with a shut-off valve, which can flexibly control the flow opening and closing of the branch lines, ensuring both normal monitoring and dead zone polymerization prevention.

[0050] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0052] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A system for addressing the issue of butadiene's tendency to polymerize in dead zones of system pipelines, characterized in that, include: Light component removal tower, used to separate propyne light component from crude butadiene; The butadiene product pump has its inlet connected to the bottom of the light-light ... The first reboiler is connected to the bottom of the de-burden tower via a first pipeline and to the reflux end of the bottom of the de-burden tower via a second pipeline; The third pipeline is connected to the second pipeline, and a first safety valve is installed at the end of the third pipeline. The area between the first safety valve and the second pipeline forms a first easily blocked area. The first flushing pipeline is connected at one end to the outlet of the butadiene product pump and at the other end between the first easily clogged area and the first safety valve.

2. The system according to claim 1 for solving the problem of butadiene's easy polymerization in the dead zone of the system pipeline, characterized in that, It also includes a heavy removal tower, which is connected to the feed inlet of the light removal tower via a fourth pipeline.

3. The system for solving the problem of butadiene's easy polymerization in the dead zone of the system pipeline according to claim 2, characterized in that, The deweight removal tower is equipped with a second reboiler and a second reflux tank. The second reboiler is connected to the bottom of the deweight removal tower via a fifth pipeline and to the reflux end of the bottom of the deweight removal tower via a sixth pipeline. The second reflux tank is connected to the top of the heavy removal tower via the seventh pipeline and to the reflux end of the top of the heavy removal tower via the eighth pipeline. One end of the fourth pipeline is connected to the eighth pipeline, and the other end is connected to the light removal tower. The light-weight removal tower is also equipped with a first reflux tank, which is connected to the top of the light-weight removal tower via a ninth pipeline and to the reflux end of the top of the light-weight removal tower via a tenth pipeline.

4. The system according to claim 3 for solving the problem of butadiene polymerization in dead zones of system pipelines, characterized in that, It also includes an eleventh pipeline, one end of which is connected to the sixth pipeline, and a second safety valve is provided at the end of the eleventh pipeline. The area between the second safety valve and the sixth pipeline forms a second easily blocked area. It also includes a twelfth pipeline, one end of which is connected to the seventh pipeline, and a third safety valve is provided at the end of the twelfth pipeline. The area between the second safety valve and the seventh pipeline forms a third easily blocked area. It also includes a thirteenth pipeline, one end of which is connected to the ninth pipeline, and a fourth safety valve is provided at the end of the thirteenth pipeline. The area between the fourth safety valve and the ninth pipeline forms a fourth easily blocked area.

5. The system for solving the problem of butadiene polymerization in dead zones of system pipelines according to claim 4, characterized in that, It also includes a second flushing line, one end of which is connected to the fourth line, and the other end is connected between the second easily clogged area and the second safety valve.

6. The system for solving the problem of butadiene polymerization in dead zones of system pipelines according to claim 5, characterized in that, It also includes a third flushing line, one end of which is connected to the second flushing line, and the other end is connected between the third easily clogged area and the third safety valve.

7. The system for solving the problem of butadiene's easy polymerization in the dead zone of the system pipeline according to claim 6, characterized in that, It also includes a fourth flushing line, one end of which is connected to the tenth line, and the other end is connected between the fourth easily clogged area and the fourth safety valve.

8. The system for solving the problem of butadiene polymerization in dead zones of system pipelines according to claim 7, characterized in that, Pressure relief valves are installed in the first, second, third, and fourth easily clogged areas.

9. The system for solving the problem of butadiene polymerization in dead zones of system pipelines according to claim 4, characterized in that, There is a bypass connecting the first, second, third, and fourth congestion areas.

10. The system according to claim 4 for solving the problem of butadiene's easy polymerization in the dead zone of the system pipeline, characterized in that, A monitoring device is installed before each of the first, second, third, and fourth safety valves.

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