Aromatic separation apparatus for producing high-boiling aromatic solvents and a method thereof

Abstract

The present application relates to chemical refining technical field, specifically to a kind of preparation high-boiling aromatic hydrocarbon solvent aromatic hydrocarbon separation device and method thereof, wherein separation device includes separation tower and reboiler, reboiler includes tank body, tank body is communicated with separation tower by the feed pipe of side portion, tank body top has the gas outlet pipe and is communicated with separation tower, heating device is provided in tank body, for liquid material heating, stirring mechanism is provided in tank body, for liquid material is stirred, driving mechanism is provided in tank body and extends vertically.The present application drives stirring mechanism to reciprocating lifting adjustment in tank body by driving mechanism, makes stirring point position cover tank body height range, breaks the limitation that traditional stirring flow field concentrates in lower part of tank body, promotes upper and lower layer liquid material to be fully mixed and flow, eliminates longitudinal flow dead angle, improves overall heat exchange efficiency and mass transfer effect, stirring area acts to liquid surface place active defoaming, maintains gas-liquid interface stability, ensure that separation device operating pressure and liquid level fluctuation are within safe range.

Description

Technical Field

[0001] This invention relates to the field of chemical refining technology, specifically to an aromatic hydrocarbon separation device and method for producing high-boiling-point aromatic hydrocarbon solvents. Background Technology

[0002] High-boiling-point aromatic solvents are a series of solvents composed of isomers of C9 and C10 heavy aromatics. Compared with corresponding alkane solvents, high-boiling-point aromatic solvents have advantages such as strong solubility, low odor, stable chemical and physical properties, good emulsifying properties, and moderate evaporation rate. High-boiling-point aromatic solvents are refined from reformed heavy aromatics through distillation. The high-boiling-point aromatic solvent series products have suitable distillation range and volatility, strong solubility, and low odor. They have been widely used in industries such as paints, inks, pesticides, and hydrogen peroxide, especially in baking-type coatings, where they exhibit high solubility in the later stages of film formation, resulting in a smooth and even coating. Furthermore, their use in paints and pesticides avoids the environmental hazards of benzene, xylene, and toluene (BTX). Aromatic plasticizers have good compatibility with PVC plastics and are ideal substitutes for dibutyl phthalate and dioctyl phthalate, used in the production of PVC plastic products.

[0003] In the existing technology, when C9 heavy aromatics are distilled to produce high-boiling-point solvents, a separation tower is mainly used for distillation separation. The reboiler used in the separation tower is usually equipped with a stirring device. Stirring not only ensures that the liquid material in the reboiler is heated evenly and quickly, improving the heat exchange efficiency, but also reduces scaling and damage on the surface of the heating element, thus improving its service life.

[0004] However, the stirring devices in traditional reboilers usually use stirring rods or stirring paddles. The stirring point is usually limited to the bottom of the tank, which causes the stirring flow field to be concentrated in the lower part of the tank. The liquid in the upper part of the tank cannot flow fully due to the limited stirring range, resulting in insufficient mixing between the upper and lower liquid layers, which affects the overall heat exchange efficiency and mass transfer effect. Summary of the Invention

[0005] The purpose of this invention is to provide an aromatic hydrocarbon separation device and method for producing high-boiling-point aromatic hydrocarbon solvents, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] An aromatic hydrocarbon separation device for producing high-boiling-point aromatic hydrocarbon solvents includes a separation tower and a reboiler. The reboiler includes a tank body, which is connected to the separation tower via a side feed pipe and an outlet pipe at the top of the tank body. The tank body has a heating device for heating the liquid material and a stirring mechanism for stirring the liquid material. The tank body also has a vertically extending drive mechanism for driving the stirring mechanism to perform reciprocating lifting and lowering adjustments within the tank body. The stirring mechanism includes a truncated cone mounted outside the drive mechanism, an annular component rotatably mounted on the outer periphery of the truncated cone, stirring rods evenly distributed on the outer periphery of the annular component, and a linkage mechanism located at the top of the truncated cone. The linkage mechanism is used to drive the annular component to rotate around the truncated cone during lifting and lowering adjustments.

[0008] Preferably, the driving mechanism includes a threaded rod, a square rod, and a driving device. The square rod is vertically fixed at the center of the tank body, and the threaded rod is vertically rotatably mounted on one side of the square rod inside the tank body. A vertically penetrating groove and a threaded hole are provided on the truncated cone. The threaded rod is threadedly mounted through the threaded hole, and the square rod is slidably mounted through the groove. The driving device is located at the top of the tank body and is used to drive the threaded rod to rotate in the forward or reverse direction.

[0009] Preferably, the linkage mechanism includes a gear rod, a bevel gear, a bevel gear ring, a rack A, and a driven gear A. The top of the frustum has a bracket A and a bracket B. The gear rod is rotatably mounted on the side of the bracket A. The rack A is vertically fixed on the side of the square rod and meshes with the gear rod. A transmission gear and a rotating shaft are rotatably mounted on the side of the bracket B. The transmission gear meshes with the gear rod. A bevel gear and a driven gear A are fixedly mounted on the rotating shaft. The driven gear A meshes with the transmission gear. A bevel gear ring is fixed at the outer periphery of the top surface of the frustum and meshes with the bevel gear.

[0010] Preferably, the heating device includes a heating rod A and several heating rods B. The heating rod A is vertically installed in the tank near the middle. Ring frames are fixed on the inner wall of the tank near its top and bottom, respectively. Several heating rods B are fixed in a ring array between the two ring frames. The heating rod A and the heating rod B form an inner and outer convection heat field.

[0011] Preferably, the square rod has a vertically extending inner cavity, and the heating rod A is vertically installed in the inner cavity.

[0012] Preferably, each stirring rod has a secondary rod fixed to the end away from the annular part.

[0013] Preferably, several mounting cylinders are evenly distributed and fixed on the outer peripheral wall of the annular component. Each stirring rod is rotatably installed in a mounting cylinder. A traction rod is coaxially fixed on the end face of the stirring rod located inside the mounting cylinder. Several springs extending radially along the mounting cylinder are evenly distributed and fixed on the outer peripheral wall of the traction rod. The other end of each spring is fixed to the inner edge wall of the mounting cylinder. Each auxiliary rod has a ball cavity at both ends. Each ball cavity is equipped with a rolling ball. Each rolling ball is exposed to the outside of the auxiliary rod. Two rolling balls are distributed at the diagonal ends of the cross-section of the auxiliary rod.

[0014] Preferably, the driving device includes a telescopic cylinder A, a connecting arm, a rack B, and a driven gear B. The telescopic cylinder A is fixed to the top of the tank. The telescopic end of the telescopic cylinder A is fixedly installed with the rack B through the connecting arm. The rack B is arranged parallel to the telescopic cylinder A. The top of the threaded rod extends through to the top of the tank and is fixedly fitted with the driven gear B. The driven gear B meshes with the rack B. The connecting arm consists of a connecting rod and connecting plates A and B fixed at both ends of the connecting rod, and has a Z-shaped structure. The connecting plate A is fixed to the telescopic end of the telescopic cylinder A, and the connecting plate B is fixed to the end of the rack B.

[0015] Preferably, a liquid level sensor is installed on the top wall of the tank, and a control box is installed on the outside of the tank via a support frame. A mounting plate is fixed to the side of the connecting plate B, and a telescopic cylinder B, which is parallel to the telescopic cylinder A, is fixed on the mounting plate. A micro-touch switch is installed on the end of the telescopic rod of the telescopic cylinder B, and a touch plate that is triggered by the micro-touch switch is fixed on the top of the tank. The micro-touch switch and the liquid level sensor are both electrically connected to the controller in the control box, and the telescopic cylinder A is controlled by the control box.

[0016] This invention also provides a method for separating aromatic hydrocarbons in the preparation of high-boiling-point aromatic hydrocarbon solvents, the specific preparation method of which is as follows:

[0017] The liquid material at the bottom of the separation tower is introduced into the tank through the feed pipe, heated by a heating device, and stirred by a stirring mechanism at the same time.

[0018] The liquid material is heated and vaporized in the tank to form steam material, which is then returned to the separation tower through the outlet pipe.

[0019] The steam material undergoes gas-liquid exchange in the separation tower. Due to the difference in boiling points of different components, the high-boiling-point solvent component gradually condenses and accumulates in the tower, and is finally discharged through the outlet of the separation tower, thus achieving the separation and production of high-boiling-point solvent.

[0020] Among them, the vertical dynamic mixing effect is achieved by driving the stirring mechanism to rise and fall through the drive mechanism;

[0021] The heating device and the stirring mechanism work together in a longitudinal dynamic stirring mechanism to form a three-dimensional heat flow network inside the tank.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0023] The stirring mechanism is driven by a drive mechanism to reciprocate and adjust the stirring position within the tank, so that the stirring point covers the entire height range of the tank. This breaks the limitation of the traditional stirring flow field being concentrated in the lower part of the tank, promotes full mixing and flow of the upper and lower liquids, effectively eliminates dead zones in the longitudinal flow, and improves the overall heat exchange efficiency and mass transfer effect. At the same time, the stirring area acts on the liquid surface to impact and actively defoam bubbles, maintain the stability of the gas-liquid interface, and ensure that the operating pressure and liquid level fluctuations of the separation device are within a safe range.

[0024] In the heating device, heating rod A is vertically installed in the tank near the middle, and several heating rods B are arranged in a ring array in the outer area of ​​the tank to form an inner and outer convection heat field. Combined with the longitudinal dynamic stirring mechanism of the stirring mechanism, a three-dimensional heat flow network is formed in the tank, which significantly shortens the heat transfer path, improves the preparation efficiency, avoids local overheating and coking of liquid materials, reduces the scaling of heavy aromatics due to high-temperature polymerization, extends the continuous operation time of the equipment, and can reduce the temperature difference in the tank, making the temperature distribution more uniform.

[0025] The drive unit uses telescopic cylinder A to extend and retract, thereby raising and lowering the stirring mechanism. Combined with the control system consisting of tank level sensor, telescopic cylinder B, and control box, the system can adjust the rising height of the stirring mechanism in real time according to the liquid level in the tank. This avoids the stirring mechanism running idly above the liquid level, which would otherwise waste energy. It achieves automated and precise adjustment of the stirring height, ensuring that the stirring effect matches the liquid level, and improving the stability and energy efficiency of the device.

[0026] The auxiliary rod fixed to the end of the stirring rod increases the stirring range, and rolling balls are provided at the diagonal ends of the auxiliary rod. During the lifting and lowering of the stirring mechanism, the compression generated when the rolling balls come into contact with the top or bottom wall of the tank causes the stirring rod and auxiliary rod to rotate, avoiding obstruction and interference to the lifting and lowering of the truss. In addition, the rolling of the rolling balls can reduce the wear between the auxiliary rod and the inner wall of the tank. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the aromatic hydrocarbon separation device for producing high-boiling-point aromatic hydrocarbon solvents.

[0028] Figure 2 This is a three-dimensional schematic diagram of the reboiler structure in this invention;

[0029] Figure 3 This is a schematic diagram of the cross-sectional structure of the tank in this invention;

[0030] Figure 4 for Figure 2 The schematic diagram of the tank structure is omitted.

[0031] Figure 5 for Figure 4 The structural diagram of the ring frame and heating rod is omitted.

[0032] Figure 6 for Figure 5 The diagram shows a partial structure.

[0033] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the structure.

[0034] Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point A in the middle;

[0035] Figure 9 This is a partial structural diagram of the linkage mechanism in this invention;

[0036] Figure 10 This is a schematic diagram of the drive device structure in this invention;

[0037] Figure 11 This is a schematic diagram showing the connection between the two telescopic cylinder structures in this invention;

[0038] Figure 12 This is a schematic diagram of the cross-sectional structure of the secondary rod in this invention;

[0039] Figure 13 This is a schematic diagram showing the contact between the auxiliary rod and the top wall of the tank in this invention;

[0040] Figure 14 This is a schematic diagram showing the contact between the auxiliary rod and the bottom wall of the tank in this invention.

[0041] In the diagram: 1. Separation tower; 2. Tank body; 21. Feed pipe; 22. Gas outlet pipe; 3. Stirring mechanism; 31. Frustum; 311. Slide groove; 312. Threaded hole; 32. Annular component; 33. Stirring rod; 331. Mounting cylinder; 332. Traction rod; 333. Spring; 34. Secondary rod; 341. Ball cavity; 342. Rolling ball; 35. Linkage mechanism; 351. Support A; 352. Gear roller; 353. Support B; 354. Transmission gear; 355. Rotating shaft; 356. Bevel gear; 357. Cone 358. Gear ring; 359. Rack A; 4. Drive mechanism; 41. Threaded rod; 42. Square rod; 421. Inner cavity; 5. Drive device; 51. Telescopic cylinder A; 52. Connecting arm; 521. Connecting plate A; 522. Connecting plate B; 523. Connecting rod; 53. Rack B; 54. Driven gear B; 6. Heating rod A; 61. Ring frame; 62. Heating rod B; 7. Telescopic cylinder B; 71. Mounting plate; 72. Micro-touch switch; 73. Contact plate; 8. Liquid level sensor; 9. Control box. Detailed Implementation

[0042] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the devices are connected to each other and their relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of the present invention, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to 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 embodiments of the present invention.

[0044] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0045] In this embodiment of the invention, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0046] References to "one embodiment" or "some embodiments" as used in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the invention. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized. Example 1

[0047] Please see Figures 1-14This invention provides an aromatic separation device for producing high-boiling-point aromatic solvents, comprising a separation tower 1 and a reboiler. The operating pressure of the separation tower 1 is reduced from 0.02 MPa to 0.008 MPa, which is close to the flare pressure, thereby reducing the operating temperature on the medium side and increasing the temperature difference between the medium and the heating side, creating conditions for subsequent efficient heat exchange. The heating temperature in the reboiler is designed to be 258-265°C to improve the heat transfer temperature. The separation tower 1 adopts existing technology, and its specific structure and working principle will not be described in detail.

[0048] The reboiler includes a tank 2, which contains a heating device for heating the liquid. The tank 2 is connected to the separation tower 1 via a feed pipe 21 on the side. The tank 2 has an outlet pipe 22 at the top that is connected to the separation tower 1. The liquid at the bottom of the separation tower 1 flows into the tank 2 of the reboiler through the feed pipe 21. The liquid is heated by the heating device in the tank 2, and the vaporized material flows back to the separation tower 1 through the outlet pipe 22 to continue participating in the separation process.

[0049] The tank 2 is equipped with a stirring mechanism 3 and a vertically extending drive mechanism 4. The drive mechanism 4 is used to drive the stirring mechanism 3 to perform reciprocating lifting and lowering adjustment within the tank 2.

[0050] like Figures 5-9 As shown, the stirring mechanism 3 includes a frustum 31 mounted on the outside of the drive mechanism 4, an annular component 32 rotatably mounted on the outer periphery of the frustum 31, stirring rods 33 evenly distributed on the outer periphery of the annular component 32, and a linkage mechanism 35.

[0051] As can be seen, the stirring mechanism 3, which consists of a frustum 31, an annular part 32 and a stirring rod 33, is driven by the driving mechanism 4 to reciprocate up and down in the tank 2, thereby achieving a dynamic stirring effect. This ensures that the stirring point is not fixed, can cover the height of the tank 2, avoids the existence of longitudinal flow dead corners in the liquid, ensures uniform mixing and heat transfer of the liquid in the upper and lower parts, ensures the uniformity of the overall temperature of the liquid in the tank 2, and improves the distillation efficiency.

[0052] In addition, the reciprocating stirring mechanism 3 periodically sweeps across the entire tank, enhancing the periodic fluctuation of liquid material in the upper and lower parts, disrupting the scaling conditions inside the tank and on the surface of components, extending the equipment cleaning cycle, and reducing maintenance costs.

[0053] Secondly, since there is a possibility of bubble accumulation on the liquid surface inside tank 2, it may lead to an imbalance in the gas-liquid flow between separation tower 1 and tank 2, causing flooding or tower overflow, which will disrupt the normal production process. This application uses a lifting and stirring design to enable the stirring area to act on the liquid surface inside tank 2. During stirring, it can actively defoam the bubbles on the liquid surface to maintain the stability of the gas-liquid interface and ensure that the operating pressure and liquid level fluctuations of separation tower 1 and tank 2 are within a safe range, so as to guarantee the normal production process.

[0054] like Figure 5 As shown, the linkage mechanism 35 is located on the top of the truncated cone 31. When the drive mechanism 4 drives the truncated cone 31 and the ring member 32 to move up and down, the linkage mechanism 35 can drive the ring member 32 to rotate around the truncated cone 31. In turn, the ring member 32 can drive each stirring rod 33 to swing synchronously, so as to achieve the dynamic stirring effect of the stirring mechanism 3 rotating and lifting. Example 2

[0055] Please see Figures 3-9 The difference between this embodiment and Embodiment 1 is that:

[0056] The drive mechanism 4 includes a threaded rod 41, a square rod 42, and a drive device 5. The square rod 42 is vertically fixed at the center inside the tank 2. The threaded rod 41 is vertically rotatably installed inside the tank 2 on one side of the square rod 42. The frustum 31 is provided with a vertically penetrating groove 311 and a threaded hole 312. The threaded rod 41 is threadedly installed through the threaded hole 312, and the square rod 42 is slidably installed through the groove 311. Through the sliding cooperation between the square rod 42 and the groove 311, the frustum 31 is provided with a guiding and limiting function.

[0057] The drive device 5 includes a telescopic cylinder A51, a connecting arm 52, a rack B53, and a driven gear B54. The telescopic cylinder A51 is fixed to the top of the tank body 2 by a fixed seat. The telescopic end of the telescopic cylinder A51 is fixedly installed with the rack B53 through the connecting arm 52. The rack B53 is arranged parallel to the telescopic cylinder A51. The top end of the threaded rod 41 extends through to the top of the tank body 2 and is fixedly fitted with the driven gear B54. The driven gear B54 meshes with the rack B53.

[0058] The telescopic cylinder A51 extends, and its telescopic end, through the connecting arm 52, drives the rack B53 to feed. The rack B53 meshes with and drives the driven gear B54, which in turn drives the threaded rod 41 to rotate. The rotating threaded rod 41 drives the truncated cone 31 to move upward along the square rod 42. When the telescopic cylinder A51 retracts, the threaded rod 41 rotates in the opposite direction, thereby driving the truncated cone 31 to move downward along the square rod 42. In other words, the periodic extension and retraction of the telescopic cylinder A51 can drive the stirring mechanism 3 to periodically rise and fall.

[0059] Among them, combined Figure 10 and Figure 11As can be seen, the connecting arm 52 consists of a connecting rod 523 and connecting plates A521 and B522 fixed at both ends of the connecting rod 523. The connecting arm 52 has a Z-shaped structure. The connecting plate A521 is fixed to the telescopic end of the telescopic cylinder A51, and the connecting plate B522 is fixed to the end of the rack B53. This design allows the telescopic cylinder A51 and the rack B53 to overlap in length range in the telescopic direction of the telescopic cylinder A51, effectively reducing the overall length and space occupation. Example 3

[0060] Please refer to the figure. Figure 6 , Figure 7 and Figure 9 The difference between this embodiment and Embodiment 2 is that:

[0061] The linkage mechanism 35 includes a gear 352, a bevel gear 356, a bevel gear ring 357, a rack A358, and a driven gear A359. The top of the frustum 31 has a bracket A351 and a bracket B353. The gear 352 is rotatably mounted on the side of the bracket A351. The rack A358 is vertically fixed on the side of the square rod 42 and meshes with the gear 352 accordingly.

[0062] A transmission gear 354 and a rotating shaft 355 are rotatably mounted on the side of the bracket B353. The transmission gear 354 meshes with the gear rod 352. A bevel gear 356 and a driven gear A359 are fixedly mounted on the rotating shaft 355. The driven gear A359 meshes with the transmission gear 354. A bevel ring 357 is fixed on the outer periphery of the top surface of the frustum 31. The bevel ring 357 meshes with the bevel gear 356.

[0063] When the drive mechanism 4 drives the frustum 31 and the ring 32 to move upward, the rack A358 meshes with and drives the toothed rod 352 to rotate. The rotating toothed rod 352 meshes with and drives the transmission gear 354 to rotate. The rotating transmission gear 354 meshes with and drives the driven gear A359 and drives the rotating shaft 355 to rotate. In turn, the rotating shaft 355 drives the bevel gear 356 to rotate. The rotating bevel gear 356 can mesh with and drive the bevel ring 357 and drive the ring 32 to rotate. This causes each stirring rod 33 to swing. Similarly, when the threaded rod 41 and the ring 32 move downward, the stirring rods 33 swing in the opposite direction, thus realizing rotational stirring.

[0064] The rotary stirring of the stirring rod 33 relies on the linkage mechanism 35 to convert the vertical relative motion of the frustum 31 and the square rod 42 into planar rotation, thus eliminating the need for an additional drive to provide rotational force for stirring and reducing operating and maintenance costs. Example 4

[0065] Please refer to the figure. Figure 3 , Figure 4 and Figure 6 The difference between this embodiment and embodiment 3 is as follows:

[0066] The heating device includes a heating rod A6 and several heating rods B62. The heating rod A6 is vertically installed inside the tank 2 near the middle. Ring frames 61 are fixed on the inner wall of the tank 2 near its top and bottom, respectively. Several heating rods B62 are fixed in a ring array between the two ring frames 61.

[0067] Since heating rod A6 is vertically positioned near the center inside tank 2, and heating rods B62 are arranged in a ring array around heating rod A6, combined with the fluctuation of the liquid caused by stirring, the heat generated by heating rod A6 working in the center of tank 2 is transferred from the center to the periphery, while the heat generated by heating rod B62 working on the periphery of tank 2 is transferred from the periphery to the center. In this way, an inner and outer convection thermal field is formed between heating rod A6 and heating rod B62, which significantly shortens the heat transfer path and thus improves the preparation efficiency.

[0068] In addition, the convection of heat between the inner and outer sides prevents local overheating and coking of the liquid material, reduces the scaling of heavy aromatics due to high-temperature polymerization, and extends the continuous operation time of the equipment. At the same time, the convection heat field can reduce the temperature difference inside the tank 2 through bidirectional heat exchange, resulting in a more uniform temperature distribution. Example 5

[0069] Please see Figures 4-8 The difference between this embodiment and embodiment 4 is that:

[0070] Each stirring rod 33 has a secondary rod 34 fixed at the end away from the annular part 32. The secondary rod 34 and the stirring rod 33 form a T-shaped structure, which can increase the stirring range.

[0071] Among them, several mounting cylinders 331 are evenly distributed and fixed on the outer peripheral wall of the annular part 32. Each stirring rod 33 is rotatably installed in the mounting cylinder 331. A traction rod 332 is coaxially fixed on the end face of the stirring rod 33 located in the mounting cylinder 331. Several springs 333 extending radially along the mounting cylinder 331 are evenly distributed and fixed on the outer peripheral wall of the traction rod 332. The other end of each spring 333 is fixed to the inner edge wall of the mounting cylinder 331. Under the elastic restraining force of the springs 333, the auxiliary rod 34 is arranged at an angle.

[0072] When the frustum 31 moves upward, the top of the auxiliary rod 34 contacts the inner top wall of the tank 2, causing the auxiliary rod 34 and the stirring rod 33 to rotate. At this time, the spring 333 twists and stores force, thus preventing the auxiliary rod 34 from causing excessive obstruction to the upward movement of the frustum 31. Similarly, when the frustum 31 moves downward, the top of the auxiliary rod 34 contacts the inner bottom wall of the tank 2, causing the auxiliary rod 34 and the stirring rod 33 to rotate. At this time, the spring 333 twists and stores force, thus preventing the auxiliary rod 34 from causing excessive obstruction to the downward movement of the frustum 31. In addition, after the auxiliary rod 34 separates from the inner top and inner bottom walls of the tank 2, the stirring rod 33 and the auxiliary rod 34 can be driven to rotate and reset under the elastic force of the spring 333, so that the auxiliary rod 34 returns to the tilted position, thereby restoring the original stirring range.

[0073] like Figure 14 As shown, each of the auxiliary rods 34 has a ball cavity 341 at both ends, and each ball cavity 341 is equipped with a rolling ball 342. Each rolling ball 342 is exposed to the outside of the auxiliary rod 34. The two rolling balls 342 are distributed at the diagonal ends of the cross section of the auxiliary rod 34, that is, the two rolling balls 342 on the same auxiliary rod 34 are diagonally distributed in a staggered manner, so as to adapt to different positions of the top wall and bottom wall inside the tank 2.

[0074] like Figure 13 As shown, when the top of the auxiliary rod 34 contacts the inner top wall of the tank 2, the upper rolling ball 342 adheres to the inner top wall of the tank 2. During stirring, the upper rolling ball 342 rolls, as... Figure 14 As shown, when the bottom end of the auxiliary rod 34 contacts the inner bottom wall of the tank 2, the lower rolling ball 342 fits against the inner bottom wall of the tank 2. During stirring, the lower rolling ball 342 rolls, thereby reducing the wear between the auxiliary rod 34 and the inner wall of the tank 2, and ensuring a smoother and more stable stirring effect.

[0075] Among them, such as Figure 6 and Figure 7 As shown, the square rod 42 has a vertically extending inner cavity 421, and the heating rod A6 is vertically installed in the inner cavity 421.

[0076] The heat generated by heating rod A6 can be transferred sequentially through square rod 42, frustum 31 and annular part 32 to stirring rod 33 and auxiliary rod 34. Stirring rod 33 transfers heat between heating rod A6 and heating rod B62, supplementing the convective heat field between heating rod A6 and heating rod B62. Combined with the lifting and rotating of annular part 32 and stirring rod 33 during stirring, a three-dimensional heat flow network with vertical circulation and radial diffusion is formed in tank 2. The heat is evenly distributed to the liquid through mechanical movement, reducing heat transfer dead zones.

[0077] The frustum 31, the annular component 32, the stirring rod 33, and the auxiliary rod 34 serve as both stirring and heat transfer components, achieving two goals at once. Example 6

[0078] Please see Figures 1-3 , Figure 10 and Figure 11 The difference between this embodiment and embodiment 5 is that:

[0079] A liquid level sensor 8 is installed on the inner top wall of the tank body 2. A control box 9 is installed on the outer side of the tank body 2 via a support frame. A mounting plate 71 is fixed to the side of the connecting plate B522. A telescopic cylinder B7, which is parallel to the telescopic cylinder A51, is fixed on the mounting plate 71. A micro-touch switch 72 is installed on the end of the telescopic rod of the telescopic cylinder B7. A touch plate 73, which is triggered and cooperates with the micro-touch switch 72, is fixed on the top of the tank body 2. The micro-touch switch 72 and the liquid level sensor 8 are both electrically connected to the controller in the control box 9. The telescopic cylinder A51 is controlled by the control box 9.

[0080] When the telescopic cylinder A51 extends and drives the stirring mechanism 3 to move upward, it can drive the telescopic cylinder B7 and the micro-touch switch 72 to move towards the touch plate 73. When the micro-touch switch 72 contacts the touch plate 73, the control box 9 controls the telescopic cylinder A51 to stop extending, that is, controls the stirring mechanism 3 to stop rising. By controlling the telescopic cylinder B7 to extend and retract through the control box 9, the distance between the micro-touch switch 72 and the touch plate 73 can be adjusted, thereby controlling the extension length of the telescopic cylinder A51. It can be seen that this mechanism can realize the control of the rising height of the stirring mechanism 3.

[0081] The liquid level sensor 8 can monitor the liquid level in the tank 2 and transmit the liquid level signal to the controller in the tank 9. The controller drives the telescopic cylinder B7 to adjust the position of the micro-touch switch 72 according to the preset threshold, thereby limiting the extension stroke of the telescopic cylinder A51, realizing the dynamic matching between the stirring height and the liquid level, and avoiding the stirring mechanism 3 from rising excessively beyond the liquid level and running dry, which would lead to energy waste.

[0082] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Therefore, the present invention will not explain the control method and circuit connection in detail.

[0083] In addition, it is worth noting that the telescopic cylinders A51 and B7 in this application can be pneumatic cylinders, hydraulic cylinders, or electric push cylinders. Example 7

[0084] This embodiment provides a method for preparing high-boiling-point aromatic hydrocarbon solvents and separating aromatic hydrocarbons. The specific preparation method is as follows:

[0085] The liquid material at the bottom of the separation tower 1 is introduced into the tank 2 through the feed pipe 21, and heated by the heating device. At the same time, it is stirred by the stirring mechanism 3.

[0086] The liquid material is heated and vaporized in tank 2 to form steam material, which is returned to the separation tower 1 through the gas outlet pipe 22.

[0087] The steam material undergoes gas-liquid exchange in the separation tower 1. Due to the difference in boiling points of different components, the high-boiling-point solvent component gradually condenses and accumulates in the tower, and is finally discharged through the outlet of the separation tower 1, thus realizing the separation and production of high-boiling-point solvent.

[0088] Among them, the vertical dynamic stirring effect is achieved by driving the stirring mechanism 3 to rise and fall through the driving mechanism 4;

[0089] The heating device and the stirring mechanism 3 work together in a longitudinal dynamic stirring mechanism to form a three-dimensional heat flow network inside the tank 2.

[0090] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. An aromatic hydrocarbon separation device for producing high-boiling-point aromatic hydrocarbon solvents, comprising a separation tower (1) and a reboiler, wherein the reboiler comprises a tank (2), the tank (2) being connected to the separation tower (1) via a side feed pipe (21), and an outlet pipe (22) at the top of the tank (2) being connected to the separation tower (1), characterized in that: The tank (2) has a heating device for heating the liquid material; The tank (2) is equipped with a stirring mechanism (3) for stirring the liquid material; The tank (2) is provided with a vertically extending drive mechanism (4) for driving the stirring mechanism (3) to perform reciprocating lifting and lowering adjustment within the tank (2); The stirring mechanism (3) includes a truncated cone (31) fitted outside the driving mechanism (4), an annular component (32) rotatably fitted on the outer periphery of the truncated cone (31), stirring rods (33) evenly distributed on the outer periphery of the annular component (32), and a linkage mechanism (35) provided on the top of the truncated cone (31). The linkage mechanism (35) is used to link the annular component (32) to rotate around the frustum (31) during lifting and adjustment; The drive mechanism (4) includes a threaded rod (41), a square rod (42), and a drive device (5). The square rod (42) is vertically fixed at the center inside the tank (2), and the threaded rod (41) is vertically rotatably installed inside the tank (2) on one side of the square rod (42). The frustum (31) is provided with a vertically penetrating groove (311) and a threaded hole (312). The threaded rod (41) is threadedly installed through the threaded hole (312), and the square rod (42) is slidably installed through the groove (311). The driving device (5) is located on the top of the tank (2) and is used to drive the threaded rod (41) to rotate in the forward or reverse direction; The linkage mechanism (35) includes a gear rod (352), a bevel gear (356), a bevel gear ring (357), a rack A (358), and a driven gear A (359). The top of the frustum (31) has a support A (351) and a support B (353). The toothed rod (352) is rotatably mounted on the side of the bracket A (351), and the rack A (358) is vertically fixed on the side of the square rod (42) and meshes with the toothed rod (352). The side of the bracket B (353) is rotatably mounted with a transmission gear (354) and a rotating shaft (355), and the transmission gear (354) meshes with the toothed rod (352); A bevel gear (356) and a driven gear A (359) are fixedly mounted on the rotating shaft (355), and the driven gear A (359) meshes with the transmission gear (354). A bevel gear ring (357) is fixed at the outer periphery of the top surface of the frustum (31), and the bevel gear ring (357) meshes with the bevel gear (356).

2. The aromatic hydrocarbon separation device for producing high-boiling-point aromatic hydrocarbon solvents according to claim 1, characterized in that: The heating device includes heating rod A (6) and several heating rods B (62); The heating rod A (6) is vertically positioned inside the tank (2) near the center; The inner wall of the tank (2) is fixed with rings (61) near its top and bottom ends respectively. Several heating rods B (62) are fixed in a ring array between two ring frames (61); The heating rod A (6) and the heating rod B (62) form an inner and outer convection thermal field.

3. The aromatic hydrocarbon separation device for producing high-boiling-point aromatic hydrocarbon solvents according to claim 2, characterized in that: The square rod (42) has a vertically extending inner cavity (421), and the heating rod A (6) is vertically installed in the inner cavity (421).

4. The aromatic hydrocarbon separation device for producing high-boiling-point aromatic hydrocarbon solvents according to claim 1, characterized in that: Each of the stirring rods (33) has a secondary rod (34) fixed at the end away from the annular part (32).

5. The aromatic hydrocarbon separation device for producing high-boiling-point aromatic hydrocarbon solvents according to claim 4, characterized in that: A plurality of mounting cylinders (331) are evenly distributed and fixed on the outer peripheral wall of the annular component (32), and each of the stirring rods (33) is rotatably installed in the mounting cylinder (331); The stirring rod (33) is coaxially fixed with a traction rod (332) on the end face inside the mounting cylinder (331). Several springs (333) that extend radially along the mounting cylinder (331) are evenly fixed on the outer peripheral wall of the traction rod (332). The other end of each spring (333) is fixed to the inner edge wall of the mounting cylinder (331). Each of the sub-rods (34) has a ball cavity (341) at both ends, and each ball cavity (341) is equipped with a rolling ball (342), and each rolling ball (342) is exposed to the outside of the sub-rod (34); The two balls (342) are distributed at opposite ends of the cross section of the auxiliary rod (34).

6. The aromatic hydrocarbon separation apparatus for producing high-boiling-point aromatic hydrocarbon solvents according to claim 1, characterized in that: The drive device (5) includes a telescopic cylinder A (51), a connecting arm (52), a rack B (53), and a driven gear B (54). The telescopic cylinder A (51) is fixed to the top of the tank body (2). The telescopic end of the telescopic cylinder A (51) is fixedly installed with a rack B (53) through a connecting arm (52). The rack B (53) is arranged parallel to the telescopic cylinder A (51). The top end of the threaded rod (41) extends through to the top of the tank body (2) and is fixedly fitted with the driven gear B (54), which meshes with the rack B (53); The connecting arm (52) is composed of a connecting rod (523) and connecting plates A (521) and B (522) fixed at both ends of the connecting rod (523), and is arranged in a Z-shaped structure. The connecting plate A (521) is fixed to the telescopic end of the telescopic cylinder A (51), and the connecting plate B (522) is fixed to the end of the rack B (53).

7. The aromatic hydrocarbon separation apparatus for producing high-boiling-point aromatic hydrocarbon solvents according to claim 6, characterized in that: A liquid level sensor (8) is installed on the inner top wall of the tank (2), and a control box (9) is installed on the outer side of the tank (2) via a support frame. A mounting plate (71) is fixed to the side of the connecting plate B (522), and a telescopic cylinder B (7) that is parallel to the telescopic cylinder A (51) is fixed on the mounting plate (71). A micro-touch switch (72) is installed on the end of the telescopic rod of the telescopic cylinder B (7). The top of the tank (2) is fixed with a contact plate (73) that is triggered by the micro-touch switch (72); The micro-touch switch (72) and the liquid level sensor (8) are both electrically connected to the controller inside the control box (9); The telescopic cylinder A (51) is controlled by the control box (9).

8. An aromatic separation method for preparing high-boiling-point aromatic solvents, based on the aromatic separation apparatus for preparing high-boiling-point aromatic solvents according to any one of claims 1-7, characterized in that: The specific preparation method is as follows: The liquid material at the bottom of the separation tower (1) is introduced into the tank (2) through the feed pipe (21), heated by the heating device, and stirred by the stirring mechanism (3) at the same time. The liquid material is heated and vaporized in the tank (2) to form steam material, and the steam material flows back to the separation tower (1) through the outlet pipe (22); The steam material undergoes gas-liquid exchange in the separation tower (1). Due to the difference in boiling points of different components, the high-boiling-point solvent component gradually condenses and accumulates in the tower, and is finally discharged through the outlet of the separation tower (1), thereby achieving the separation and production of high-boiling-point solvent. The stirring mechanism (3) is driven to rise and fall by the driving mechanism (4) to achieve a vertical dynamic stirring effect; The heating device works in conjunction with the longitudinal dynamic stirring mechanism of the stirring mechanism (3) to form a three-dimensional heat flow network inside the tank (2).

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