Olefin oligomerization reaction system

Abstract

The utility model provides an olefin oligomerization reaction system. The olefin oligomerization reaction system comprises a plurality of reactors; the number of the first gas-phase material conveying pipes is multiple, the two ends of each first gas-phase material conveying pipe are connected with the two adjacent reactors respectively, and the first gas-phase material conveying pipes are used for conveying gas-phase materials in the previous reactor to the next reactor; the number of the first liquid phase conveying pipes is multiple, the two ends of each first liquid phase conveying pipe are connected with the two adjacent reactors respectively, and the first liquid phase conveying pipes are used for conveying liquid phase materials in the previous reactor to the next reactor; the material receiving end of the first gas-phase material conveying pipe is higher than the feeding end, and the material receiving end of the first liquid-phase material conveying pipe is higher than the feeding end, so that a height difference exists between two adjacent reactors. The olefin oligomerization reaction system disclosed by the utility model solves the technical problem that the stability of the reaction system is influenced as olefin oligomerization intermediate products are easy to accumulate in related technologies.

Description

Technical Field

[0001] The utility model relates to the technical field of olefin polymerization reaction, in particular to an olefin polymerization reaction system. Background Art

[0002] Existing olefin polymerization reactors have kettle structures and tubular structures. Among them, the tubular structure has a single-tube structure and a multi-tube structure. In the past, in a multi-tube olefin polymerization reactor, each reaction unit was connected by a single feed pipeline, which not only transported gas-phase olefin raw materials but also transported liquid-phase polymerization products.

[0003] However, due to the difference in the state of gas-phase and liquid-phase materials, problems such as accumulation of liquid-phase polymerization products or poor transportation of gas-phase olefin raw materials may occur, and the feeding state fluctuates greatly, affecting the stability of the entire reaction system.

[0004] Therefore, the prior art needs to be further developed. Utility Model Content

[0005] The utility model aims to overcome the above technical deficiencies and provide an olefin polymerization reaction system to solve the technical problem in the related art that olefin polymerization intermediates are prone to accumulate in the same feed pipe, affecting the stability of the reaction system.

[0006] In order to achieve the above technical objectives, the utility model adopts the following technical scheme: an olefin polymerization reaction system is provided, comprising: a reactor, wherein there are multiple reactors; a first gas-phase conveying pipe, wherein there are multiple first gas-phase conveying pipes, and the two ends of each first gas-phase conveying pipe are respectively connected to two adjacent reactors, and the first gas-phase conveying pipe is used to convey the gas-phase material in the previous reactor to the next reactor; a first liquid-phase conveying pipe, wherein there are multiple first liquid-phase conveying pipes, and the two ends of each first liquid-phase conveying pipe are respectively connected to two adjacent reactors, and the first liquid-phase conveying pipe is used to convey the liquid-phase material in the previous reactor to the next reactor; the height of the material receiving end of the first gas-phase conveying pipe is higher than the height of the material feeding end, and the height of the material receiving end of the first liquid-phase conveying pipe is higher than the height of the material feeding end, so that there is a height difference between the two adjacent reactors.

[0007] Furthermore, each reactor is provided with a liquid distributor, which is located at the top of the reactor. The first liquid phase feeding pipe transports the liquid phase material to the liquid distributor in the reactor, and the liquid phase material is evenly dispersed in the reactor through the liquid distributor.

[0008] Furthermore, each reactor is provided with a jacket on its periphery, and an inlet and an outlet are provided on the jacket. The fluid enters the jacket from the inlet and flows out from the outlet, so that the fluid and the reactor are exchanged with each other, thereby changing the temperature in the reactor.

[0009] Further, a flow guiding baffle is provided in the reactor. The flow guiding baffle is correspondingly arranged at the material receiving end of the first gas-phase feed pipe. The liquid material on the inner wall of the reactor slides down along the flow guiding baffle to the bottom of the reactor, thus preventing it from flowing out from the material receiving end of the first gas-phase feed pipe.

[0010] Further, there are three reactors, namely the first reactor, the second reactor, and the third reactor. The height of the material receiving end of the first gas-phase feed pipe between the first reactor and the second reactor is higher than the height of the material receiving end of the first gas-phase feed pipe between the second reactor and the third reactor. The first reactor is further connected with a mixing and pressurizing device. After the gas is pressurized by the mixing and pressurizing device, it enters the first reactor.

[0011] Further, a third gas-phase feed pipe is provided between the mixing and pressurizing device and the first reactor. After the pressurized gas is transported through the third gas-phase feed pipe, it first contacts the liquid distributor in the first reactor.

[0012] Further, the olefin oligomerization reaction system further includes a gas-liquid separation tank. The gas-liquid separation tank is connected to the third reactor. The material flowing out from the third reactor is separated into gas-phase material and liquid-phase material through the gas-liquid separation tank.

[0013] Further, a second gas-phase feed pipe and a second liquid-phase feed pipe are provided between the gas-liquid separation tank and the third reactor. The height of the material receiving end of the second gas-phase feed pipe is higher than the height of the feeding end, and the height of the material receiving end of the second liquid-phase feed pipe is higher than the height of the feeding end, so that there is a height difference between the third reactor and the gas-liquid separation tank.

[0014] Further, a liquid level sensor is provided in the gas-liquid separation tank. The liquid level sensor is used to monitor the liquid level in the gas-liquid separation tank. The olefin oligomerization reaction system further includes a feed pump. The feed pump is connected to the gas-liquid separation tank. The feed pump is used to extract the liquid material in the gas-liquid separation tank, and the feed pump is signal-connected to the liquid level sensor.

[0015] Further, a fourth gas-phase feed pipe is provided between the gas-liquid separation tank and the mixing and pressurizing device. The fourth gas-phase feed pipe is used to transport the gas-phase material in the gas-liquid separation tank to the mixing and pressurizing device for cyclic pressurization.

[0016] Beneficial effects:

[0017] 1. In the olefin oligomerization reaction system of the present utility model, by setting the height of the material receiving ends of the first gas-phase feed pipe and the first liquid-phase feed pipe higher than the height of the feeding ends, a height difference between adjacent reactors is formed, effectively preventing the accumulation of intermediate products generated during the olefin oligomerization reaction in the same feed pipe, thereby reducing pipeline blockage, reaction efficiency decline, and system stability problems caused by accumulation.

[0018] 2. In the olefin oligomerization reaction system of the present utility model, the deflector baffle inside the reactor is correspondingly arranged with the receiving end of the first gas-phase feed pipe, effectively guiding the liquid material on the inner wall of the reactor to slide down along the baffle to the bottom of the reactor, preventing the liquid material from flowing out from the receiving end of the gas-phase feed pipe, and further ensuring the stable operation of the system.

[0019] 3. The olefin oligomerization reaction system of the present utility model integrates intelligent devices such as a liquid level sensor and a feed pump, can monitor the liquid level in the gas-liquid separation tank in real time, and automatically extract the liquid material as needed, improving the automation degree and operation stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the olefin oligomerization reaction system adopted in the embodiment of the present utility model;

[0021] Figure 2 is a schematic structural diagram of one of the reactors of the olefin oligomerization reaction system adopted in the embodiment of the present utility model.

[0022] Among them, the above-mentioned drawings include the following reference numerals:

[0023] 1. Reactor; 11. Liquid distributor; 12. Jacket; 121. Inlet; 122. Outlet; 13. Deflector baffle; 14. First reactor; 15. Second reactor; 16. Third reactor; 17. Solid catalyst; 18. Third liquid-phase feed pipe; 2. First gas-phase feed pipe; 3. First liquid-phase feed pipe; 4. Mixing and pressurizing equipment; 5. Third gas-phase feed pipe; 6. Gas-liquid separation tank; 61. Liquid level sensor; 62. Fourth liquid-phase feed pipe; 7. Second gas-phase feed pipe; 8. Second liquid-phase feed pipe; 9. Feed pump; 10. Fourth gas-phase feed pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0025] According to an embodiment of the present utility model, an olefin oligomerization reaction system is provided. Please refer to Figures 1 to 2, including: reactors 1, and there are multiple reactors 1; first gas-phase feed pipes 2, and there are multiple first gas-phase feed pipes 2. Both ends of each first gas-phase feed pipe 2 are respectively connected to two adjacent reactors 1. The first gas-phase feed pipe 2 is used to transport the gas-phase material in the previous reactor 1 to the next reactor 1; first liquid-phase feed pipes 3, and there are multiple first liquid-phase feed pipes 3. Both ends of each first liquid-phase feed pipe 3 are respectively connected to two adjacent reactors 1. The first liquid-phase feed pipe 3 is used to transport the liquid-phase material in the previous reactor 1 to the next reactor 1; the height of the receiving end of the first gas-phase feed pipe 2 is higher than the height of the feeding end, and the height of the receiving end of the first liquid-phase feed pipe 3 is higher than the height of the feeding end, so that there is a height difference between two adjacent reactors 1. Through the series design of multiple reactors 1, a height difference is formed between adjacent reactors 1. This design of the height difference helps to utilize gravity to promote the natural flow of gas-phase and liquid-phase products, effectively prevents the accumulation and blockage of materials in the feed pipes, and enhances the stability and reliability of the system. The olefin oligomerization reaction system of this embodiment solves the technical problem in the related art that the oligomerization intermediate products of olefins are prone to accumulate in the same feed pipe, affecting the stability of the reaction system.

[0026] Refer to Figure 2 , in the olefin oligomerization reaction system of this embodiment, a liquid distributor 11 is provided in each reactor 1. The liquid distributor 11 is located at the top of the reactor 1. The first liquid-phase feed pipe 3 transports the liquid-phase material into the liquid distributor 11 in the reactor 1, and after passing through the liquid distributor 11, the liquid-phase material is evenly dispersed in the reactor 1. The liquid distributor 11 can ensure that the liquid-phase material is quickly and evenly dispersed into the entire reaction space after entering the reactor 1, avoiding the problems of local accumulation or uneven distribution of materials in the reactor 1, thereby improving the uniformity of the reaction.

[0027] Refer to Figure 2 , in the olefin oligomerization reaction system of this embodiment, a jacket 12 is provided on the outer periphery of each reactor 1. An inlet 121 and an outlet 122 are provided on the jacket 12. The fluid enters the jacket 12 from the inlet 121 and then flows out from the outlet 122, so that the fluid exchanges energy with the reactor 1, thereby changing the temperature in the reactor 1. The fluid entering the jacket 12 exchanges heat with the reactor 1, realizing the control of the internal temperature of the reactor 1, which helps to ensure that the reaction proceeds under the optimal temperature conditions, thereby improving the quality and yield of the product.

[0028] Refer to Figure 1 and Figure 2, in the olefin oligomerization reaction system of this embodiment, a flow guiding baffle 13 is further provided in the reactor 1. The flow guiding baffle 13 is correspondingly arranged at the receiving end of the first gas-phase feeding pipe 2. The liquid material on the inner wall of the reactor 1 slides down along the flow guiding baffle 13 to the bottom of the reactor 1, thus preventing it from flowing out from the receiving end of the first gas-phase feeding pipe 2. In the reactor 1, through the catalytic action of the solid catalyst 17, the formed intermediate product contains liquid-phase material. The flow guiding baffle 13 is correspondingly arranged at the receiving end of the first gas-phase feeding pipe 2, effectively guiding the liquid material on the inner wall of the reactor 1 to slide down along the flow guiding baffle 13 to the bottom of the reactor 1, and preventing the liquid material from accidentally flowing out from the receiving end of the gas-phase feeding pipe.

[0029] Refer to Figure 1 , in the olefin oligomerization reaction system of this embodiment, there are three reactors 1, namely the first reactor 14, the second reactor 15 and the third reactor 16. The height of the receiving end of the first gas-phase feeding pipe 2 between the first reactor 14 and the second reactor 15 is higher than the height of the receiving end of the first gas-phase feeding pipe 2 between the second reactor 15 and the third reactor 16. The first reactor 14 is also connected with a mixing and pressurizing device 4. After the gas is pressurized by the mixing and pressurizing device 4, it enters the first reactor 14. The series design of the three reactors 1 enables the reaction process to be carried out in stages, and each reactor can control the reaction conditions (such as temperature, pressure, reaction time, etc.) as needed, so as to optimize the overall reaction process. The first reactor 14 is connected with the mixing and pressurizing device 4, enabling the gas entering the first reactor 14 to participate in the reaction more fully after being pressurized. The reaction system also includes a third liquid-phase feeding pipe 18. After the olefin oligomerization liquid product is separated by subsequent distillation, part of the unqualified light components return to the liquid distributor 11 in the first reactor 14 through the third liquid-phase feeding pipe 18 to continue the reaction.

[0030] Refer to Figure 1 , in the olefin oligomerization reaction system of this embodiment, a third gas-phase feeding pipe 5 is provided between the mixing and pressurizing device 4 and the first reactor 14. After being conveyed through the third gas-phase feeding pipe 5, the pressurized gas first contacts the liquid distributor 11 in the first reactor 14.

[0031] Refer to Figure 1 , in the olefin oligomerization reaction system of this embodiment, the olefin oligomerization reaction system further includes a gas-liquid separation tank 6. The gas-liquid separation tank 6 is connected with the third reactor 16. The material flowing out from the third reactor 16 is separated into gas-phase material and liquid-phase material through the gas-liquid separation tank 6. Different-phase products can be separately collected and processed through the gas-liquid separation tank 6.

[0032] Refer to Figure 1, in the olefin oligomerization reaction system of this embodiment, a second gas-phase feed pipe 7 and a second liquid-phase feed pipe 8 are provided between the gas-liquid separation tank 6 and the third reactor 16. The height of the material receiving end of the second gas-phase feed pipe 7 is higher than that of the feeding end, and the height of the material receiving end of the second liquid-phase feed pipe 8 is higher than that of the feeding end, so that there is a height difference between the third reactor 16 and the gas-liquid separation tank 6. The design of the height difference utilizes the gravitational force of the fluid, enabling the material flowing out of the third reactor 16 to enter the gas-liquid separation tank 6 more smoothly.

[0033] Refer to Figure 1 , in the olefin oligomerization reaction system of this embodiment, a liquid level sensor 61 is provided in the gas-liquid separation tank 6. The liquid level sensor 61 is used to monitor the liquid level in the gas-liquid separation tank 6. The olefin oligomerization reaction system further includes a feed pump 9. The feed pump 9 is connected to the gas-liquid separation tank 6 and is used to extract the liquid material in the gas-liquid separation tank 6. The feed pump 9 is signal-connected to the liquid level sensor 61. By monitoring the liquid level in the gas-liquid separation tank 6 in real time through the liquid level sensor 61, automatic monitoring and management of the system operation can be achieved. When the liquid level reaches a certain threshold, the liquid level sensor 61 will send a signal to the feed pump 9, and the feed pump 9 extracts the liquid phase material from the gas-liquid separation tank 6 through the fourth liquid-phase feed pipe 62, thereby realizing the timely extraction and treatment of the liquid material.

[0034] Refer to Figure 1 , in the olefin oligomerization reaction system of this embodiment, a fourth gas-phase feed pipe 10 is provided between the gas-liquid separation tank 6 and the mixing and pressurizing device 4. The fourth gas-phase feed pipe 10 is used to transport the gas material in the gas-liquid separation tank 6 to the mixing and pressurizing device 4 for cyclic pressurization. Through cyclic pressurization, the unreacted or incompletely reacted olefin gas material can be re-introduced into the reaction system, improving the utilization rate of the reactants.

[0035] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0036] Optionally, the specific examples in this embodiment can refer to the examples described in the above embodiment, and will not be elaborated here.

[0037] The serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments.

[0038] In the above embodiments of the present application, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0039] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An olefin oligomerization reaction system, characterized in that: include: A reactor (1), wherein the reactor (1) is multiple; a first gas-phase material conveying pipe (2), wherein the first gas-phase material conveying pipe (2) is multiple, and the two ends of each first gas-phase material conveying pipe (2) are respectively connected to two adjacent reactors (1), and the first gas-phase material conveying pipe (2) is used to convey the gas-phase material in the previous reactor (1) to the next reactor (1); a first liquid-phase material conveying pipe (3), wherein the first liquid-phase material conveying pipe (3) is multiple, and the two ends of each first liquid-phase material conveying pipe (3) are respectively connected to two adjacent reactors (1), and the first liquid-phase material conveying pipe (3) is used to convey the liquid-phase material in the previous reactor (1) to the next reactor (1); The height of the material receiving end of the first gas phase material conveying pipe (2) is higher than the height of the material feeding end, and the height of the material receiving end of the first liquid phase material conveying pipe (3) is higher than the height of the material feeding end, so that there is a height difference between two adjacent reactors (1).

2. The olefin oligomerization reaction system according to claim 1, characterized in that: Each of the reactors (1) is provided with a liquid distributor (11), and the liquid distributor (11) is located at the top of the reactor (1). The first liquid phase material delivery pipe (3) delivers the liquid phase material to the liquid distributor (11) in the reactor (1), and the liquid phase material is evenly dispersed in the reactor (1) through the liquid distributor (11).

3. The olefin oligomerization reaction system according to claim 1, characterized in that: A jacket (12) is provided on the outer periphery of each of the reactors (1), and an inlet (121) and an outlet (122) are provided on the jacket (12). A fluid enters the jacket (12) from the inlet (121) and then flows out from the outlet (122), so that the fluid exchanges energy with the reactor (1), thereby changing the temperature inside the reactor (1).

4. The olefin oligomerization reaction system according to claim 1, characterized in that: The reactor (1) is further provided with a guide baffle (13), the guide baffle (13) being arranged corresponding to the material receiving end of the first gas phase material conveying pipe (2), so that the liquid material on the inner wall of the reactor (1) slides along the guide baffle (13) to the bottom of the reactor (1), thereby avoiding flowing out from the material receiving end of the first gas phase material conveying pipe (2).

5. The olefin oligomerization reaction system according to claim 2, characterized in that: The reactors (1) are three, namely a first reactor (14), a second reactor (15) and a third reactor (16). The height of the material connection end of the first gas-phase material conveying pipe (2) between the first reactor (14) and the second reactor (15) is higher than the height of the material connection end of the first gas-phase material conveying pipe (2) between the second reactor (15) and the third reactor (16). The first reactor (14) is also connected to a mixing and pressurizing device (4). After the gas is pressurized by the mixing and pressurizing device (4), it enters the first reactor (14).

6. The olefin oligomerization reaction system according to claim 5, characterized in that: A third gas phase conveying pipe (5) is provided between the mixing and pressurizing device (4) and the first reactor (14); the pressurized gas is transported through the third gas phase conveying pipe (5) and first contacts the liquid distributor (11) in the first reactor (14).

7. The olefin oligomerization reaction system according to claim 5, characterized in that: The olefin polymerization reaction system further comprises a gas-liquid separation tank (6), wherein the gas-liquid separation tank (6) is connected to the third reactor (16), and the material flowing out of the third reactor (16) passes through the gas-liquid separation tank (6) to separate the gas phase material from the liquid phase material.

8. The olefin oligomerization reaction system according to claim 7, characterized in that: A second gas-phase material conveying pipe (7) and a second liquid-phase material conveying pipe (8) are provided between the gas-liquid separation tank (6) and the third reactor (16); the height of the material receiving end of the second gas-phase material conveying pipe (7) is higher than the height of the material feeding end; and the height of the material receiving end of the second liquid-phase material conveying pipe (8) is higher than the height of the material feeding end, so that there is a height difference between the third reactor (16) and the gas-liquid separation tank (6).

9. The olefin oligomerization reaction system according to claim 8, characterized in that: A liquid level sensor (61) is arranged in the gas-liquid separation tank (6), and the liquid level sensor (61) is used to monitor the liquid level in the gas-liquid separation tank (6). The olefin polymerization reaction system further comprises a feed pump (9), and the feed pump (9) is connected to the gas-liquid separation tank (6). The feed pump (9) is used to extract liquid material in the gas-liquid separation tank (6), and the feed pump (9) is connected to the liquid level sensor (61) by signal.

10. The olefin oligomerization reaction system according to claim 7, characterized in that: A fourth gas phase conveying pipe (10) is provided between the gas-liquid separation tank (6) and the mixing and pressurizing device (4), and the fourth gas phase conveying pipe (10) is used to convey the gaseous material in the gas-liquid separation tank (6) to the mixing and pressurizing device (4) for circulation and pressurization.

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