A temperature swing polymerization reactor for ethylene tar

Abstract

The application discloses an ethylene tar variable-temperature polymerization reaction device, which comprises a radial reactor, a first circulating heating mechanism and a second circulating heating mechanism, a medium-temperature zone and a high-temperature zone are sequentially arranged in the radial reactor from bottom to top, and a raw material inlet and a product outlet are arranged at the bottom end and the top end of the radial reactor respectively. The technical effects are as follows: the reaction temperature can be controlled in sections, the ethylene tar enters the device for segmented reaction and continuous production, the reaction is more complete, the qualified product yield and the production efficiency can be effectively improved, the uniformity of the material temperature in the medium-temperature zone and the high-temperature zone can be ensured, the stability of the reaction is improved, the required reaction components or catalysts can be added according to the production demand, the efficient and stable reaction is ensured, the device is suitable for ethylene tar raw materials, is also suitable for coal tar, catalytic cracking oil slurry and other aromatic hydrocarbon-rich raw oil, and different specifications of products such as impregnated pitch, coated pitch, spinning pitch and mesophase pitch can be produced.

Description

Technical Field

[0001] This invention relates to the technical field of ethylene tar processing equipment, specifically to a temperature-switched polymerization reactor for ethylene tar. Background Technology

[0002] Ethylene tar is a high-temperature condensation product of feedstock and products during the steam cracking process of ethylene production. Currently, in China, ethylene tar is generally used as fuel in boilers or kilns, resulting in low economic value. Furthermore, as a high-temperature condensation product of ethylene feedstock, its main components are aromatic compounds with short side chains, high C-H ratio, low ash content, and very little heavy metal content. When used as fuel in boilers or cracking furnaces, its presence of heavy olefinic aromatics easily leads to coking and black smoke during combustion, causing environmental pollution. Therefore, how to fully and rationally utilize this large amount of tar feedstock produced as a byproduct of ethylene processes to generate optimal economic benefits will have a significant impact on the overall efficiency of ethylene plants and the development of deep processing of ethylene byproducts. This is also one of the important issues that urgently needs to be addressed in the current domestic and international ethylene post-processing industry. Existing technologies mostly use batch reactors to process ethylene tar, which suffers from inconsistent temperature distribution, affecting product quality, and resulting in low product yield. Summary of the Invention

[0003] Therefore, the present invention provides an ethylene tar temperature-switching polymerization reactor to solve the above-mentioned problems in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] According to a first aspect of the present invention, an ethylene tar temperature-switching polymerization apparatus includes a radial reactor, a first circulating heating mechanism, and a second circulating heating mechanism. The radial reactor contains a medium-temperature zone and a high-temperature zone arranged sequentially from bottom to top. The bottom and top of the radial reactor are respectively provided with a raw material inlet and a product outlet. The medium-temperature zone has a first circulating material extraction outlet at its end near the high-temperature zone. The feed end of the first circulating heating mechanism is connected to the first circulating material extraction outlet, and the discharge end of the first circulating heating mechanism is connected to the raw material inlet. The high-temperature zone has a second circulating material injection port at its end near the medium-temperature zone, and a second circulating material extraction port at its end away from the medium-temperature zone. The feed end of the second circulating heating mechanism is connected to the second circulating material extraction port, and the discharge end of the second circulating heating mechanism is connected to the second circulating material injection port. The medium-temperature zone has a first hydrocarbonating agent injection port, and the high-temperature zone has a second hydrocarbonating agent injection port.

[0006] Furthermore, the temperature in the medium temperature zone is 360°C to 380°C, and the temperature in the high temperature zone is 380°C to 420°C;

[0007] It also includes a raw material input pipe and a reaction product discharge pipe. One end of the raw material input pipe is connected to the discharge end of the first circulating heating mechanism, and one end of the reaction product discharge pipe is connected to the product outlet.

[0008] Furthermore, it also includes a gas-liquid distributor disposed between the medium-temperature zone and the high-temperature zone.

[0009] Furthermore, it also includes multiple anti-mixing screen plates, which are sequentially arranged along the axial direction of the radial reactor within the radial reactor.

[0010] Furthermore, the anti-mixing screen plate includes a first anti-mixing screen plate and a second anti-mixing screen plate. Multiple first anti-mixing screen plates are provided in the medium temperature zone, and a first hydrocarbon agent injection port is provided between two adjacent first anti-mixing screen plates. Multiple second anti-mixing screen plates are provided in the high temperature zone, and a second hydrocarbon agent injection port is provided between two adjacent second anti-mixing screen plates.

[0011] Furthermore, the first anti-mixing screen plate and the second anti-mixing screen plate each include an outer frame, a blind plate, and multiple blades. The outer frame is annular, the blind plate is horizontally disposed at the center of the outer frame, and the multiple blades are distributed in a circular array along the blind plate. One end of each blade is connected to the blind plate, and the other end of each blade is connected to the inner wall of the outer frame. The angle between the blade and the horizontal plane is 15° to 25°.

[0012] Furthermore, the number of blades is between 10 and 50.

[0013] Furthermore, the number of blades in the first anti-mixing screen plate is less than the number of blades in the second anti-mixing screen plate.

[0014] Furthermore, the first circulating heating mechanism includes a first circulating pipeline, a first circulating pump, and a first heater. The feed end of the first circulating pipeline is connected to the first circulating material extraction port, and the discharge end of the first circulating pipeline is connected to the raw material inlet. The first circulating pump and the first heater are respectively installed on the first circulating pipeline.

[0015] The second circulating heating mechanism includes a second circulating pipeline, a second circulating pump, and a second heater. The inlet end of the second circulating pipeline is connected to the second circulating material outlet, and the outlet end of the second circulating pipeline is connected to the second circulating material inlet. The second circulating pump and the second heater are respectively installed on the second circulating pipeline.

[0016] Furthermore, multiple valves are respectively installed on the first circulation pipeline and the second circulation pipeline.

[0017] This invention has the following advantages: It employs a radial reactor with intermediate and high-temperature zones, enabling segmented temperature control of the reaction. Ethylene tar reacts in stages and is continuously produced after entering the device, resulting in more complete material reaction and effectively improving the yield of qualified products and production efficiency. By setting up a first and second circulating heating mechanism, the uniformity of material temperature within the intermediate and high-temperature zones is effectively ensured, thereby improving reaction stability and guaranteeing product quality. The first and second hydrocarbonating agent injection ports allow for the addition of required reaction components or catalysts according to production needs, ensuring efficient and stable reaction within the radial reactor. This device is not only suitable for ethylene tar feedstock but also for aromatic feedstocks such as coal tar and catalytic cracking slurry, and can produce different specifications of products such as impregnated asphalt, coated asphalt, spinning asphalt, and mesophase asphalt. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of an ethylene tar temperature-switching polymerization reactor provided in some embodiments of the present invention.

[0021] Figure 2 This is a top view of an anti-mixing screen plate of an ethylene tar temperature-switching polymerization reactor provided in some embodiments of the present invention.

[0022] Figure 3 This is a cross-sectional view of an anti-mixing screen plate of an ethylene tar temperature-switching polymerization reactor provided in some embodiments of the present invention.

[0023] Figure 4 This is a schematic diagram of the blade structure of an anti-mixing sieve plate in an ethylene tar temperature-variable polymerization reactor provided in some embodiments of the present invention.

[0024] In the diagram: 1. Radial reactor; 2. Intermediate temperature zone; 3. High temperature zone; 4. Gas-liquid distributor; 5. First anti-mixing screen plate; 6. Second anti-mixing screen plate; 7. Raw material inlet; 8. Product outlet; 9. First hydrocarbon agent injection port; 10. First hydrocarbon agent feed pipe; 11. First circulating material extraction port; 12. Second hydrocarbon agent injection port; 13. Second hydrocarbon agent feed pipe; 14. Second circulating material injection port; 15. Second circulating material extraction port; 16. Raw material input pipe; 17. First circulating pipeline; 18. First circulating pump; 19. First heater; 20. Second circulating pipeline; 21. Second circulating pump; 22. Second heater; 23. Reaction product discharge pipe; 24. Outer frame; 25. Blind plate; 26. Blade. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figures 1 to 4 As shown, an ethylene tar temperature-switching polymerization apparatus according to a first aspect embodiment of the present invention includes a radial reactor 1, a first circulating heating mechanism, and a second circulating heating mechanism. A medium-temperature zone 2 and a high-temperature zone 3 are sequentially arranged from bottom to top within the radial reactor 1. A raw material inlet 7 and a product outlet 8 are respectively provided at the bottom and top of the radial reactor 1. A first circulating material extraction outlet 11 is provided at the end of the medium-temperature zone 2 near the high-temperature zone 3. The feed end of the first circulating heating mechanism is connected to the first circulating material extraction outlet 11, and the discharge end of the first circulating heating mechanism is connected to the raw material inlet 7. A second circulating material injection port 14 is provided at the end of the high-temperature zone 3 near the medium-temperature zone 2, and a second circulating material extraction outlet 15 is provided at the end of the high-temperature zone 3 away from the medium-temperature zone 2. The feed end of the second circulating heating mechanism is connected to the second circulating material extraction outlet 15, and the discharge end of the second circulating heating mechanism is connected to the second circulating material injection port 14. A first hydrocarbonating agent injection port 9 is provided in the medium-temperature zone 2, and a second hydrocarbonating agent injection port 12 is provided in the high-temperature zone 3.

[0027] In the above embodiments, it should be noted that the total height-to-diameter ratio of the radial reactor 1 is 10:1 to 20:1, the height ratio of the medium temperature zone 2 to the high temperature zone 3 is 2:1, and the radial reactor 1 is provided with a first degassing downcomer and a second degassing downcomer. The first degassing downcomer is located at the first circulating material outlet 11, and the second degassing downcomer is located at the second circulating material outlet 15.

[0028] The technical effects achieved by the above embodiments are as follows: Using a radial reactor 1, and setting up a medium-temperature zone 2 and a high-temperature zone 3, the reaction temperature can be controlled in stages. After ethylene tar enters this device, it undergoes a staged reaction and continuous production, resulting in a more complete material reaction and effectively improving the yield of qualified products and production efficiency. By setting up a first circulating heating mechanism and a second circulating heating mechanism, the uniformity of material temperature within the medium-temperature zone 2 and the high-temperature zone 3 can be effectively ensured, thereby improving the stability of the reaction and ensuring product quality. By setting up a first hydrocarbonating agent injection port 9 and a second hydrocarbonating agent injection port 12, the required reaction components or catalysts can be added according to production needs, thereby ensuring the efficient and stable reaction within the radial reactor. This device is not only suitable for ethylene tar feedstock, but also for aromatic feedstocks such as coal tar and catalytic cracking slurry, and can produce different specifications of products such as impregnated asphalt, coated asphalt, spinning asphalt, and mesophase asphalt.

[0029] Optional, such as Figures 1 to 4 As shown, in some embodiments, the temperature in the medium temperature zone 2 is 360°C to 380°C, and the temperature in the high temperature zone 3 is 380°C to 420°C.

[0030] It also includes a raw material input pipe 16 and a reaction product discharge pipe 23. One end of the raw material input pipe 16 is connected to the discharge end of the first circulating heating mechanism, and one end of the reaction product discharge pipe 23 is connected to the product outlet 8.

[0031] In the above optional embodiments, it should be noted that the temperature of the medium temperature zone 2 can be set to 360°C, 365°C, 368°C, 370°C, 375°C or 380°C, and the temperature of the high temperature zone 3 can be set to 380°C, 390°C, 395°C, 400°C, 410°C, 415°C or 420°C.

[0032] Further, the entire production process of the unit is as follows: Ethylene tar feedstock enters the reactor 1 through feedstock inlet 7 and first reaches the intermediate temperature zone 2. Then, the hydrocarbonating agent is injected through the first hydrocarbonating agent injection port 9, and a preliminary reaction takes place in the intermediate temperature zone 2. During the reaction, the material in the intermediate temperature zone 2 is heated by the first circulating material extraction port 11 and then returned to the intermediate temperature zone 2 through feedstock inlet 7 to ensure the uniformity of the reaction temperature in the intermediate temperature zone 2. After the material reacts in the intermediate temperature zone 2 for a certain period of time, it enters the high temperature zone 3 from bottom to top. Then, the hydrocarbonating agent is injected again through the second hydrocarbonating agent injection port 12, and the material reacts again in the high temperature zone 3. During the reaction, the material in the high temperature zone 3 is heated by the second circulating material extraction port 15 and then enters the high temperature zone 2 through the second circulating material injection port 14 to ensure the uniformity of the reaction temperature in the high temperature zone 2. Finally, after the material reacts in the high temperature zone for a period of time, the product is sent out through the product outlet 8 at the top of the radial reactor 1.

[0033] The advantages of the above optional embodiments are: the temperature in the medium temperature zone 2 is 360°C to 380°C, and the temperature in the high temperature zone 3 is 380°C to 420°C. By setting different temperatures during the production process, the reaction rate can be flexibly controlled.

[0034] Optional, such as Figures 1 to 4 As shown, in some embodiments, a gas-liquid distributor 4 is also included, which is disposed between the medium temperature zone 2 and the high temperature zone 3.

[0035] The advantages of the above optional embodiments are: by setting the gas-liquid distributor 4, the material can be mixed evenly when it passes through the gas-liquid distributor 4, further ensuring the uniformity of the material in the radial reactor 1.

[0036] Optional, such as Figures 1 to 4 As shown, in some embodiments, multiple anti-mixing screens are also included, which are arranged sequentially along the axial direction of the radial reactor 1 within the radial reactor 1.

[0037] In the above optional embodiments, it should be noted that the anti-mixing screen plate includes a first anti-mixing screen plate 5 and a second anti-mixing screen plate 6. Multiple first anti-mixing screen plates 5 are provided in the medium temperature zone 2. A first hydrocarbon agent injection port 9 is provided between two adjacent first anti-mixing screen plates 5. The first hydrocarbon agent injection port 9 is connected to one end of the first hydrocarbon agent feeding pipe 10. Multiple second anti-mixing screen plates 6 are provided in the high temperature zone 3. A second hydrocarbon agent injection port 12 is provided between two adjacent second anti-mixing screen plates 6. The second hydrocarbon agent injection port 12 is connected to one end of the second hydrocarbon agent feeding pipe 13.

[0038] Furthermore, multiple first anti-mixing screen plates 5 are arranged at equal intervals along the height direction of the medium temperature zone 2, and multiple second anti-mixing screen plates 6 are arranged at equal intervals along the height direction of the high temperature zone 3.

[0039] Furthermore, the number of first anti-mixing screen plates 5 is 5 to 10, and the number of second anti-mixing screen plates 6 is 3 to 8. The first anti-mixing screen plate 5 and the second anti-mixing screen plate 6 respectively include an outer frame 24, a blind plate 25 and multiple blades 26. The outer frame 24 is annular, the blind plate 25 is horizontally arranged at the center of the outer frame 24, and the multiple blades 26 are distributed in a circular array along the blind plate 25. One end of the blade 26 is connected to the blind plate 25, and the other end of the blade 26 is connected to the inner wall of the outer frame 24. The angle between the blade 26 and the horizontal plane is 15° to 25°.

[0040] The beneficial effects of the above optional embodiments are as follows: by setting the first anti-mixing screen plate 5 and the second anti-mixing screen plate 6, it can be ensured that the material always moves from bottom to top in the radial reactor 1. At the same time, after the material passes through the first anti-mixing screen plate 5 or the second anti-mixing screen plate 6, the flow direction is spiral, which can play the role of mixing materials, ensuring the uniformity of materials in the radial reactor 1, and ensuring the reaction effect.

[0041] Optional, such as Figures 1 to 4 As shown, in some embodiments, the number of blades 26 is 10 to 50.

[0042] In the above optional embodiments, it should be noted that the blind plate 25 is circular, and the two ends of the blade 26 are welded to the blind plate 25 and the outer frame 24 respectively. The number of blades 26 can be set to 10, 15, 20, 26, 28, 30, 35, 40 or 50.

[0043] Furthermore, the number of blades 26 in the first anti-mixing screen plate 5 is less than the number of blades 26 in the second anti-mixing screen plate 6 (the basic structures of the first anti-mixing screen plate 5 and the second anti-mixing screen plate 6 are the same, only the number of blades 26 is different). In the medium temperature zone 2, the number of blades 26 in each first anti-mixing screen plate 5 increases from bottom to top (the higher the position of the first anti-mixing screen plate 5, the more blades 26 there are). In the high temperature zone 3, the number of blades 26 in each second anti-mixing screen plate 6 increases from bottom to top (the higher the position of the second anti-mixing screen plate 6, the more blades 26 there are).

[0044] The advantages of the above optional embodiments are as follows: the number of blades 26 in the first anti-mixing screen plate 5 is less than the number of blades 26 in the second anti-mixing screen plate 6. The higher the blades are in the radial reactor 1, the better the material can be prevented from moving downwards, and the better the material mixing effect is.

[0045] Optional, such as Figures 1 to 4 As shown, in some embodiments, the first circulating heating mechanism includes a first circulating pipeline 17, a first circulating pump 18, and a first heater 19. The feed end of the first circulating pipeline 17 is connected to the first circulating material extraction port 11, and the discharge end of the first circulating pipeline 17 is connected to the raw material inlet 7. The first circulating pump 18 and the first heater 19 are respectively disposed on the first circulating pipeline 17.

[0046] The second circulating heating mechanism includes a second circulating pipeline 20, a second circulating pump 21, and a second heater 22. The feed end of the second circulating pipeline 20 is connected to the second circulating material extraction port 15, and the discharge end of the second circulating pipeline 20 is connected to the second circulating material injection port 14. The second circulating pump 21 and the second heater 22 are respectively installed on the second circulating pipeline 20.

[0047] In the above optional embodiments, it should be noted that multiple valves are respectively provided on the first circulation pipeline 17 and the second circulation pipeline 20, and both the first circulation pump 18 and the second circulation pump 21 are large circulation liquid pumps.

[0048] The advantages of the above optional embodiments are as follows: the first circulating heating mechanism and the second circulating heating mechanism are respectively provided with a first heater 19 and a second heater 22, which are used in conjunction with the first circulating pump 18 and the second circulating pump 21, respectively, so as to realize segmented controllable temperature change in the radial reactor 1 and continuous production; by setting multiple first hydrocarbon agent injection ports 9 and second hydrocarbon agent injection ports 12, activators and other additives can also be injected, and by controlling the temperature in the medium temperature zone 2 and the temperature in the high temperature zone 3, different specifications of products such as impregnated asphalt, coated asphalt, spinning asphalt, and mesophase asphalt can be produced, with high product quality and product yield.

[0049] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0050] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A temperature-switching polymerization apparatus for ethylene tar, characterized in that, The reactor includes a radial reactor (1), a first circulating heating mechanism, and a second circulating heating mechanism. The radial reactor (1) contains a medium-temperature zone (2) and a high-temperature zone (3) arranged sequentially from bottom to top. The bottom and top of the radial reactor (1) are respectively provided with a raw material inlet (7) and a product outlet (8). The medium-temperature zone (2) near the high-temperature zone (3) has a first circulating material extraction outlet (11). The feed end of the first circulating heating mechanism is connected to the first circulating material extraction outlet (11), and the discharge end of the first circulating heating mechanism is connected to the raw material inlet. (7) Connected; the high temperature zone (3) is provided with a second circulating material injection port (14) at one end near the medium temperature zone (2), and the high temperature zone (3) is provided with a second circulating material extraction port (15) at one end away from the medium temperature zone (2). The feed end of the second circulating heating mechanism is connected to the second circulating material extraction port (15), and the discharge end of the second circulating heating mechanism is connected to the second circulating material injection port (14). The medium temperature zone (2) is provided with a first hydrocarbon agent injection port (9), and the high temperature zone (3) is provided with a second hydrocarbon agent injection port (12). It also includes multiple anti-mixing screen plates, which are arranged sequentially along the axial direction of the radial reactor (1) within the radial reactor (1). The anti-mixing screen plates include a first anti-mixing screen plate (5) and a second anti-mixing screen plate (6). Multiple first anti-mixing screen plates (5) are provided in the medium temperature zone (2), and a first hydrocarbon agent injection port (9) is provided between two adjacent first anti-mixing screen plates (5). Multiple second anti-mixing screen plates (6) are provided in the high temperature zone (3), and a second hydrocarbon agent injection port (12) is provided between two adjacent second anti-mixing screen plates (6). The first anti-mixing screen plate (5) and the second anti-mixing screen plate (6) respectively include an outer frame (24), a blind plate (25) and multiple blades (26). The outer frame (24) is circular. The blind plate (25) is horizontally arranged at the center of the outer frame (24). The multiple blades (26) are distributed in a circular array along the blind plate (25). One end of the blade (26) is connected to the blind plate (25), and the other end of the blade (26) is connected to the inner wall of the outer frame (24). The included angle between the blade (26) and the horizontal plane is 15° to 25°.

2. The ethylene tar temperature-switching polymerization apparatus according to claim 1, characterized in that, The temperature in the medium temperature zone (2) is 360°C to 380°C, and the temperature in the high temperature zone (3) is 380°C to 420°C. It also includes a raw material input pipe (16) and a reaction product discharge pipe (23). One end of the raw material input pipe (16) is connected to the discharge end of the first circulating heating mechanism, and one end of the reaction product discharge pipe (23) is connected to the product outlet (8).

3. The ethylene tar temperature-switching polymerization apparatus according to claim 1, characterized in that, It also includes a gas-liquid distributor (4), which is disposed between the medium temperature zone (2) and the high temperature zone (3).

4. The ethylene tar temperature-switching polymerization apparatus according to claim 1, characterized in that, The number of blades (26) is between 10 and 50.

5. The ethylene tar temperature-switching polymerization apparatus according to claim 4, characterized in that, The number of blades (26) in the first anti-mixing screen plate (5) is less than the number of blades (26) in the second anti-mixing screen plate (6).

6. The ethylene tar temperature-switching polymerization apparatus according to claim 1, characterized in that, The first circulating heating mechanism includes a first circulating pipeline (17), a first circulating pump (18) and a first heater (19). The feed end of the first circulating pipeline (17) is connected to the first circulating material outlet (11), and the discharge end of the first circulating pipeline (17) is connected to the raw material inlet (7). The first circulating pump (18) and the first heater (19) are respectively installed on the first circulating pipeline (17). The second circulating heating mechanism includes a second circulating pipeline (20), a second circulating pump (21), and a second heater (22). The feed end of the second circulating pipeline (20) is connected to the second circulating material outlet (15), and the discharge end of the second circulating pipeline (20) is connected to the second circulating material injection port (14). The second circulating pump (21) and the second heater (22) are respectively installed on the second circulating pipeline (20).

7. The ethylene tar temperature-switching polymerization apparatus according to claim 6, characterized in that, Multiple valves are provided on the first circulation pipeline (17) and the second circulation pipeline (20).

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