Aromatic hydrocarbon separation device and method for preparing high-boiling-point aromatic hydrocarbon solvent

Abstract

The invention relates to the technical field of chemical refining, in particular to an aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent and a method thereof.The separation device comprises a separation tower and a reboiler, the reboiler comprises a tank body, the tank body is communicated with the separation tower through a feeding pipe on the side portion, and a gas outlet pipe arranged at the top of the tank body is communicated with the separation tower; a heating device is arranged in the tank body and is used for supplying heat to a liquid material, a stirring mechanism is arranged in the tank body and is used for stirring the liquid material, and a driving mechanism which vertically extends is arranged in the tank body. The stirring mechanism is driven by the driving mechanism to perform reciprocating lifting adjustment in the tank body, so that a stirring point position covers the height range of the tank body, the limitation that a traditional stirring flow field is concentrated at the lower part of the tank body is broken, upper and lower layers of liquid materials are promoted to fully mix and flow, longitudinal flowing dead angles are eliminated, and the overall heat exchange efficiency and mass transfer effect are improved; the stirring area acts on the liquid level to actively defoam, the gas-liquid interface is kept stable, and it is ensured that the operation pressure and liquid level fluctuation of the separation device are within the safe range.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical refining, in particular to an aromatic hydrocarbon separation device and a method for preparing a high-boiling-point aromatic hydrocarbon solvent. Background Art

[0002] High-boiling-point aromatic solvents are a series of solvents composed of isomers of C9 and C10 heavy aromatics. Compared to their corresponding alkane solvents, high-boiling-point aromatic solvents offer advantages such as strong solubility, low odor, stable chemical and physical properties, good emulsification, and moderate volatility. High-boiling-point aromatic solvents are produced from reformed heavy aromatics through distillation. These products feature a suitable distillation range and volatility, strong solvency, and low odor. They are widely used in industries such as paints, inks, pesticides, and hydrogen peroxide. They are particularly effective in baking coatings, where they exhibit high solvency in the later stages of film formation, resulting in smooth and even coatings. Furthermore, their use in paints and pesticides can mitigate the environmental hazards of triphenyl. Aromatic plasticizers have good compatibility with PVC plastics, making them ideal alternatives to dibutyl esters and dioctyl esters for the production of PVC plastic products.

[0003] In the prior art, when C9 heavy aromatics are distilled to produce high-boiling-point solvents, separation towers are mainly used for distillation separation. The reboiler used in the separation tower is usually equipped with a stirring device. Through stirring, not only can the liquid material in the reboiler be heated evenly and quickly, thereby improving the heat exchange efficiency, but also by stirring the liquid material, scaling and damage on the surface of the heating element can be reduced, thereby improving the service life.

[0004] However, the stirring device in the traditional reboiler usually adopts a stirring rod or a stirring paddle, and the stirring point is usually limited to the bottom of the tank, resulting in the stirring flow field distribution 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 of the upper and lower layers of liquid, affecting the overall heat exchange efficiency and mass transfer effect. Summary of the Invention

[0005] The object of the present invention is to provide an aromatic hydrocarbon separation device and method for preparing a high-boiling point aromatic hydrocarbon solvent, so as to solve the technical problems raised in the above background technology.

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

[0007] The invention discloses an aromatic hydrocarbon separation device for producing a high-boiling-point aromatic hydrocarbon solvent, comprising a separation tower and a reboiler. The reboiler comprises a tank body, which is connected to the separation tower via a feed pipe on the side. An air outlet pipe provided on the top of the tank body is connected to the separation tower. A heating device is provided in the tank body for supplying heat to a liquid material. A stirring mechanism is provided in the tank body for stirring the liquid material. A vertically extending driving mechanism is provided in the tank body for driving the stirring mechanism to perform reciprocating lifting and lowering adjustment in the tank body. The stirring mechanism comprises a frustum sleeved on the outside of the driving mechanism, an annular member rotatably sleeved on the outer circumference of the frustum, stirring rods uniformly distributed on the outer circumferential wall of the annular member, and a linkage mechanism provided on the top of the frustum. The linkage mechanism is used to link the annular member to rotate around the frustum during lifting and lowering adjustment.

[0008] Preferably, the driving mechanism includes a threaded rod, a square rod and a driving device. The square rod is vertically fixed in the center of the tank body. The threaded rod is vertically rotatably installed in the tank body on one side of the square rod. A vertical through-groove and a threaded hole are provided on the round platform. The threaded rod is thread-matched and installed through the threaded hole. The square rod is slidably installed in the groove. The driving device is provided on the top of the tank body for driving the threaded rod to rotate forward or reverse.

[0009] Preferably, the linkage mechanism includes a gear stick, a bevel gear, a bevel gear ring, a rack A and a driven gear A. The top of the frustum is provided with a bracket A and a bracket B. The gear stick 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 stick. A transmission gear and a rotating shaft are rotatably mounted on the side of the bracket B. The transmission gear meshes with the gear stick. 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 on the outer periphery of the top surface of the frustum, and the bevel gear ring 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 arranged near the middle of the tank body. Ring frames are fixed on the inner wall of the tank body near its top and bottom ends respectively. Several heating rods B are fixed in a ring array between the two ring frames. The heating rods A and the heating rods B form an inner and outer convection heat field.

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

[0012] Preferably, a secondary rod is fixed to the end of each stirring rod away from the annular member.

[0013] Preferably, a number of mounting cylinders are evenly fixed on the outer peripheral wall of the annular member, and each stirring rod is correspondingly rotatably installed in the mounting cylinder. A traction rod is coaxially fixed to the end face of the stirring rod located in the mounting cylinder, and a number of springs extending radially along the mounting cylinder are evenly fixed on the outer peripheral wall of the traction rod, and the other end of each spring is fixed to the inner edge wall of the mounting cylinder. A ball cavity is provided at both ends of each auxiliary rod, and a rolling ball is installed in each ball cavity. Each rolling ball is exposed to the outside of the auxiliary rod, wherein the two rolling balls are distributed at the diagonal parts at both ends of the auxiliary rod cross section.

[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 on the top of the tank body. The telescopic end of the telescopic cylinder A is fixedly installed with a rack B through the connecting arm. The rack B is arranged parallel to the telescopic cylinder A. The top end of the threaded rod extends through and extends to the top of the tank body, and is fixedly fitted with a driven gear B. The driven gear B is engaged with the rack B accordingly. The connecting arm is composed of a connecting rod and a connecting plate A and a connecting plate B fixed at both ends of the connecting rod, and is arranged in 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 body, a control box is installed on the outside of the tank body through a support frame, a mounting plate is fixed to the side of the connecting plate B, a telescopic cylinder B 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 cooperates with the micro-touch switch to trigger is fixed on the top of the tank body, wherein 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] The present invention also provides an aromatic hydrocarbon separation method for preparing a high-boiling point aromatic hydrocarbon solvent. The specific preparation method is as follows: The liquid material at the bottom of the separation tower is introduced into the tank through the feed pipe, heated by the heating device, and stirred by the stirring mechanism during heating; The liquid material is heated and vaporized in the tank to form steam material, which flows back to the separation tower through the outlet pipe; 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 enriches in the tower, and is finally discharged through the outlet of the separation tower, realizing the separation and production of the high-boiling-point solvent; Among them, the driving mechanism drives the stirring mechanism to rise and fall to achieve a longitudinal dynamic stirring effect; The heating device cooperates with the longitudinal dynamic stirring mechanism of the stirring mechanism to form a three-dimensional heat flow network in the tank body.

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] The driving mechanism drives the stirring mechanism to perform reciprocating lifting and lowering adjustment in the tank body, so that the stirring points cover the height range of the tank body, breaking the limitation of the traditional stirring flow field concentrated in the lower part of the tank body, promoting the full mixing and flow of the upper and lower layers of liquid materials, effectively eliminating the vertical flow dead angle, and improving the overall heat exchange efficiency and mass transfer effect. At the same time, the stirring area acts on the liquid surface to impact the bubbles and actively defoam, 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.

[0019] In the heating device, the heating rod A is vertically arranged near the middle of the tank body, and several heating rods B are arranged in a circular array in the outer area of the tank body 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 body, 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 narrow the temperature difference in the tank and make the temperature distribution more uniform.

[0020] The driving device drives the stirring mechanism to rise and fall by extending and retracting the telescopic cylinder A. Combined with the control system consisting of the tank liquid level sensor, telescopic cylinder B and control box, the rising height of the stirring mechanism can be adjusted in real time according to the liquid level height in the tank, avoiding the stirring mechanism from idling beyond the liquid level and causing energy waste, realizing automatic and precise adjustment of the stirring height, ensuring that the stirring effect is adapted to the liquid level, and improving the stability and energy saving of the device operation.

[0021] The auxiliary rod is fixed at the end of the stirring rod to increase the stirring range, and rolling balls are provided at the diagonal parts of both ends of the auxiliary rod. During the lifting and lowering process of the stirring mechanism, the extrusion generated when the rolling balls collide with the top wall or the inner bottom wall of the tank body prompts the stirring rod and the auxiliary rod to rotate, avoiding obstruction and interference in the lifting and lowering of the round table, and the rolling of the rolling balls can reduce the wear between the auxiliary rod and the inner wall of the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the aromatic separation device for preparing high-boiling-point aromatic solvents; Figure 2 It is a schematic three-dimensional diagram of the reboiler structure in the present invention; Figure 3 Schematic diagram of the cross-sectional structure of the tank body in the present invention; Figure 4 for Figure 2 The schematic diagram of the tank structure is omitted; Figure 5 for Figure 4 The schematic diagram of the ring frame and heating rod structure is omitted; Figure 6 for Figure 5 The schematic diagram of the local structure shown; Figure 7 for Figure 6 Schematic diagram of the cross section of the structure shown; Figure 8 for Figure 7 A schematic diagram of the structure at center A; Figure 9 It is a schematic diagram of the local structure of the linkage mechanism in the present invention; Figure 10 Schematic diagram of the structure of the driving device in the present invention; Figure 11 This is a schematic diagram of the connection between the two telescopic cylinder structures in the present invention; Figure 12 Schematic diagram of the cross-sectional structure of the auxiliary rod in the present invention; Figure 13 This is a schematic diagram of the auxiliary rod in the present invention interfering with the top wall of the tank body; Figure 14 This is a schematic diagram of the auxiliary rod in the present invention interfering with the bottom wall of the tank body.

[0023] In the figure: 1, separation tower; 2, tank; 21, feed pipe; 22, outlet pipe; 3, stirring mechanism; 31, round table; 311, slide; 312, threaded hole; 32, ring; 33, stirring rod; 331, mounting cylinder; 332, traction rod; 333, spring; 34, auxiliary rod; 341, ball cavity; 342, rolling ball; 35, linkage mechanism; 351, bracket A; 352, gear stick; 353, bracket B; 354, transmission gear; 355, rotating shaft; 356, bevel gear; 357, bevel Gear ring; 358. Rack A; 359. Driven gear A; 4. Driving mechanism; 41. Threaded rod; 42. Square rod; 421. Inner cavity; 5. Driving 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. Touch panel; 8. Liquid level sensor; 9. Control box. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. 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. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0026] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0027] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0028] References to "one embodiment" or "some embodiments" 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 present invention. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in 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 "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. Example 1

[0029] See also Figures 1-14The present invention provides an aromatic hydrocarbon separation device for producing a high-boiling-point aromatic hydrocarbon solvent, 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 heat supply side, creating conditions for subsequent efficient heat exchange. The heating temperature in the reboiler is designed to be 258-265°C to increase the heat transfer temperature. The separation tower 1 adopts existing technology, and its specific structure and working principle are not described in detail. The reboiler includes a tank body 2, which has a heating device for heating the liquid. The tank body 2 is connected to the separation tower 1 through a feed pipe 21 on the side, and an outlet pipe 22 on the top of the tank body 2 is connected to the separation tower 1. The liquid at the bottom of the separation tower 1 flows into the tank body 2 of the reboiler through the feed pipe 21, and the liquid is heated by the heating device in the tank body 2. The vaporized material will flow back to the separation tower 1 through the outlet pipe 22 to continue to participate in the separation process.

[0030] A stirring mechanism 3 is provided in the tank body 2 , and a vertically extending driving mechanism 4 is provided in the tank body 2 , wherein the driving mechanism 4 is used to drive the stirring mechanism 3 to perform reciprocating lifting and lowering adjustment in the tank body 2 .

[0031] like Figure 5-Figure 9 As shown, the stirring mechanism 3 includes a truncated table 31 mounted on the outside of the driving mechanism 4, a ring member 32 rotatably mounted on the outer periphery of the truncated table 31, stirring rods 33 uniformly distributed on the outer peripheral wall of the ring member 32, and a linkage mechanism 35; It can be seen that the driving mechanism 4 drives the stirring mechanism 3 composed of the truncated table 31, the annular member 32 and the stirring rod 33 to reciprocate and rise and fall in the tank body 2, thereby achieving a dynamic stirring effect of lifting type, ensuring that the stirring point is not fixed and can cover the height of the tank body 2, avoiding the existence of dead angles in the longitudinal flow of the liquid material, ensuring uniform mixing and heat transfer of the upper and lower liquid materials, ensuring the uniformity of the overall temperature of the liquid material in the entire tank body 2, and improving the distillation efficiency; In addition, the stirring mechanism 3 that reciprocates up and down periodically sweeps across the entire tank, enhancing the periodic liquid material fluctuations in the upper and lower parts, destroying the scaling conditions inside the tank and on the surface of the components, extending the equipment cleaning cycle, and reducing maintenance costs.

[0032] Secondly, since there may be bubble accumulation on the liquid surface in the tank body 2, which will lead to an imbalance in the gas-liquid flow between the separation tower 1 and the tank body 2, causing liquid overflow or tower flushing, which will disrupt the normal production process. The present application uses a lifting stirring design to enable the stirring area to act on the liquid surface in the tank body 2, and then during stirring, it can impact the bubbles on the liquid surface for active defoaming, so as to maintain the stability of the gas-liquid interface and ensure that the operating pressure and liquid level fluctuations of the separation tower 1 and the tank body 2 are within a safe range, so as to ensure the normal production process.

[0033] like Figure 5As shown, the linkage mechanism 35 is arranged on the top of the table 31. When the driving mechanism 4 drives the table 31 and the ring member 32 to rise and fall, the linkage mechanism 35 can link the ring member 32 to rotate around the table 31, and then the ring member 32 can drive each stirring rod 33 to swing synchronously, thereby realizing the dynamic stirring effect of the stirring mechanism 3 in the form of rotation and lifting. Example 2

[0034] See also Figure 3-Figure 9 The difference between this embodiment and embodiment 1 is that: The driving mechanism 4 includes a threaded rod 41, a square rod 42 and a driving device 5. The square rod 42 is vertically fixed at the center of the tank body 2. The threaded rod 41 is vertically rotatably installed in the tank body 2 on one side of the square rod 42. A vertical through-slot 311 and a threaded hole 312 are provided on the round table 31. The threaded rod 41 is threadedly matched and installed through the threaded hole 312. The square rod 42 is slidably installed through the slot 311. The sliding cooperation between the square rod 42 and the slot 311 provides a guiding and limiting function for the round table 31.

[0035] The driving 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 fixing seat. The telescopic end of the telescopic cylinder A51 is fixedly installed with a 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 and extends to the top of the tank body 2, and is fixedly fitted with a driven gear B54. The driven gear B54 is meshed with the rack B53.

[0036] The telescopic cylinder A51 extends, and its telescopic end drives the rack B53 to feed through the connection of the connecting arm 52. The rack B53 engages and drives the driven gear B54 and drives the threaded rod 41 to rotate. The rotating threaded rod 41 drives the table 31 to move upward along the square rod 42. When the telescopic cylinder A51 retracts, similarly, the threaded rod 41 is driven to rotate in the opposite direction, and then the table 31 is driven to move downward along the square rod 42. That is, through the periodic extension and retraction of the telescopic cylinder A51, the stirring mechanism 3 can be driven to rise and fall periodically.

[0037] Among them, combined Figure 10 and Figure 11 It can be seen that the connecting arm 52 is composed of a connecting rod 523 and a connecting plate A521 and a connecting plate B522 fixed at both ends of the connecting rod 523, and the connecting arm 52 has a Z-shaped structural layout as a whole. 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 reducing space occupancy. Example 3

[0038] Please refer to the figure Figure 6 、 Figure 7 and Figure 9 The difference between this embodiment and embodiment 2 is that: The linkage mechanism 35 includes a gear rod 352, a bevel gear 356, a bevel gear ring 357, a rack A358, and a driven gear A359. A bracket A351 and a bracket B353 are provided on the top of the frustum 31. The gear rod 352 is rotatably mounted on the side of the bracket A351. The rack A358 is vertically fixed to the side of the square rod 42 and meshes with the gear rod 352. A transmission gear 354 and a rotating shaft 355 are rotatably installed on the side of the bracket B353. The transmission gear 354 is meshed 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 is meshed with the transmission gear 354. A bevel gear ring 357 is fixed on the outer periphery of the top surface of the frustum 31. The bevel gear ring 357 is meshed with the bevel gear 356.

[0039] When the driving mechanism 4 drives the table 31 and the ring member 32 upward, the rack A358 engages to drive the toothed rod 352 to rotate, and the rotating toothed rod 352 engages to drive the transmission gear 354 to rotate. The rotating transmission gear 354 engages to drive the driven gear A359 and drives the rotating shaft 355 to rotate, and then the rotating shaft 355 drives the bevel gear 356 to rotate. The rotating bevel gear 356 can engage to drive the bevel gear ring 357 and drive the ring member 32 to rotate, and then drive each stirring rod 33 to swing. When the threaded rod 41 and the ring member 32 descend, similarly, the stirring rod 33 is driven to swing in the opposite direction, thereby realizing rotary stirring.

[0040] The rotary stirring of the stirring rod 33 relies on the linkage mechanism 35 to convert the vertical relative movement of the circular table 31 and the square rod 42 into a planar rotation, thereby eliminating the need for an additional drive to provide rotational force for stirring, thereby reducing operation and maintenance costs. Example 4

[0041] Please refer to the figure Figure 3 、 Figure 4 and Figure 6 The difference between this embodiment and embodiment 3 is that: The heating device includes a heating rod A6 and several heating rods B62. The heating rod A6 is vertically arranged near the middle of the tank body 2. Ring frames 61 are fixed on the inner wall of the tank body 2 near its top and bottom ends. Several heating rods B62 are fixed in a ring array between the two ring frames 61.

[0042] Since the heating rod A6 is vertically arranged near the middle of the tank body 2, and the heating rods B62 are arranged in a circular array around the heating rod A6, the stirring causes fluctuations in the liquid material. The heat generated by the heating rod A6 working in the center of the tank body 2 is transferred from the center to the periphery, and the heat generated by the heating rod B62 working on the periphery of the tank body 2 is transferred from the periphery to the center. In this way, an inner-outer convection heat field is formed between the heating rods A6 and B62, which significantly shortens the heat transfer path and thus improves the preparation efficiency. In addition, heat convection between the inner and outer peripheries avoids local overheating and coking of the liquid material, reduces scaling of heavy aromatic hydrocarbons 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 in the tank body 2 through two-way heat exchange, making the temperature distribution more uniform. Example 5

[0043] See also Figure 4-Figure 8 The difference between this embodiment and embodiment 4 is that: A secondary rod 34 is fixed to the end of each stirring rod 33 away from the annular member 32 . The secondary rod 34 and the stirring rod 33 form a T-shaped structure, which can increase the stirring range.

[0044] Among them, a number of mounting cylinders 331 are evenly fixed on the outer peripheral wall of the annular member 32, and each stirring rod 33 is correspondingly 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, and a number of springs 333 extending 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. Under the action of the elastic restraining force of the spring 333, the auxiliary rod 34 is arranged tilted.

[0045] When the table 31 moves upward, the top end of the auxiliary rod 34 contacts the inner top wall of the tank body 2, squeezing the auxiliary rod 34 and the stirring rod 33 to rotate. At this time, the spring 333 twists and stores force, thereby preventing the auxiliary rod 34 from causing excessive obstruction and interference to the upward movement of the table 31. When the table 31 moves downward, similarly, the top end of the auxiliary rod 34 contacts the inner bottom wall of the tank body 2, squeezing the auxiliary rod 34 and the stirring rod 33 to rotate. At this time, the spring 333 twists and stores force, thereby preventing the auxiliary rod 34 from causing excessive obstruction and interference to the downward movement of the table 31. In addition, after the auxiliary rod 34 separates from the inner top wall and inner bottom wall of the tank body 2, under the action of the elastic force of the spring 333, the stirring rod 33 and the auxiliary rod 34 can be driven to rotate and reset, so that the auxiliary rod 34 is reset to the inclined state, thereby restoring the original stirring range.

[0046] like Figure 14As shown, a ball cavity 341 is provided at both ends of each auxiliary rod 34, and a ball 342 is installed in each ball cavity 341. Each ball 342 is exposed to the outside of the auxiliary rod 34, wherein the two balls 342 are distributed at the two end diagonals of the cross section of the auxiliary rod 34, that is, the two balls 342 on the same auxiliary rod 34 are staggered diagonally distributed so as to adapt to different positions of the inner top wall and the inner bottom wall of the tank body 2.

[0047] like Figure 13 As shown, when the top of the auxiliary rod 34 contacts the inner top wall of the tank body 2, the upper rolling ball 342 fits the inner top wall of the tank body 2. When stirring, the upper rolling ball 342 rolls, as shown in FIG. Figure 14 As shown, when the bottom end of the auxiliary rod 34 collides with the inner bottom wall of the tank body 2, the lower ball 342 fits against the inner bottom wall of the tank body 2. During stirring, the lower ball 342 rolls, thereby reducing the wear between the auxiliary rod 34 and the inner wall of the tank body 2 and ensuring a smoother and more stable stirring effect.

[0048] Among them, such as Figure 6 and Figure 7 As shown, a vertically extending inner cavity 421 is provided in the square rod 42 , and the heating rod A6 is vertically installed in the inner cavity 421 .

[0049] The heat generated by the heating rod A6 can be transferred to the stirring rod 33 and the auxiliary rod 34 in sequence through the square rod 42, the truncated cone 31 and the annular member 32. The stirring rod 33 transfers heat between the heating rod A6 and the heating rod B62, supplementing the convection heat field between the heating rods A6 and B62. Combined with the lifting and rotation of the annular member 32 and the stirring rod 33 during stirring, a three-dimensional heat flow network with up and down circulation and radial diffusion is formed in the tank body 2. The heat is evenly distributed to the liquid material through mechanical movement, reducing heat transfer blind spots. The truncated table 31, the annular member 32, the stirring rod 33 and the auxiliary rod 34 serve as both a stirring member and a heat transfer member, thus achieving two goals at one stroke. Example 6

[0050] See also Figure 1-Figure 3 、 Figure 10 and Figure 11 The difference between this embodiment and embodiment 5 is that: A liquid level sensor 8 is installed on the top wall of the tank body 2, and a control box 9 is installed on the outside of the tank body 2 through a support frame. A mounting plate 71 is fixed to the side of the connecting plate B522, and a telescopic cylinder B7 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, and a touch plate 73 that is triggered by 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 electrically connected to the controller in the control box 9, and the telescopic cylinder A51 is controlled by the control box 9.

[0051] When the telescopic cylinder A51 extends to drive the stirring mechanism 3 to move upward, it can drive the telescopic cylinder B7 and the micro-touch switch 72 to feed toward the side of 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, the stirring mechanism 3 stops 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, and then the extended length of the telescopic cylinder A51 can be regulated. It can be seen that this mechanism can realize the regulation of the rising height of the stirring mechanism 3.

[0052] The liquid level sensor 8 can monitor the liquid level in the tank body 2 and transmit the liquid level signal to the controller in 9. The controller drives the telescopic cylinder B7 to adjust the position of the micro-touch switch 72 according to the preset threshold value, thereby limiting the telescopic stroke of the telescopic cylinder A51, realizing dynamic matching of the stirring height and the liquid level, and avoiding the stirring mechanism 3 from rising excessively beyond the liquid level and idling, thereby wasting energy.

[0053] 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 technicians in this field. The provision of power is also common knowledge in this field, so the present invention will no longer explain the control method and circuit connection in detail.

[0054] In addition, it is worth mentioning that the telescopic cylinder A51 and the telescopic cylinder B7 in the present application can be made of structures such as air cylinders, hydraulic cylinders or electric push cylinders. Example 7

[0055] This embodiment provides an aromatic hydrocarbon separation method for preparing a high-boiling point aromatic hydrocarbon solvent. The specific preparation method is as follows: The liquid material at the bottom of the separation tower 1 is introduced into the tank body 2 through the feed pipe 21, and is heated by the heating device. While being heated, it is stirred by the stirring mechanism 3; The liquid material is heated and vaporized in the tank 2 to form steam material, which flows back into 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 enriches in the tower, and is finally discharged through the outlet of the separation tower 1, thereby achieving the separation and production of the high-boiling-point solvent; The driving mechanism 4 drives the stirring mechanism 3 to move up and down to achieve a longitudinal dynamic stirring effect; The heating device cooperates with the longitudinal dynamic stirring mechanism of the stirring mechanism 3 to form a three-dimensional heat flow network in the tank body 2.

[0056] 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 a high-boiling-point aromatic hydrocarbon solvent, comprising a separation tower (1) and a reboiler, wherein the reboiler comprises a tank body (2), the tank body (2) being connected to the separation tower (1) via a feed pipe (21) on the side, and an air outlet pipe (22) on the top of the tank body (2) being connected to the separation tower (1), characterized in that: The tank body (2) is provided with a heating device for providing heat to the liquid material; The tank body (2) is provided with a stirring mechanism (3) for stirring the liquid material; A vertically extending driving mechanism (4) is provided in the tank body (2) for driving the stirring mechanism (3) to perform reciprocating lifting and lowering adjustment in the tank body (2); The stirring mechanism (3) comprises a truncated table (31) mounted on the outside of the driving mechanism (4), an annular member (32) rotatably mounted on the outer periphery of the truncated table (31), stirring rods (33) uniformly distributed on the outer peripheral wall of the annular member (32), and a linkage mechanism (35) disposed on the top of the truncated table (31); The linkage mechanism (35) is used to link the annular member (32) to rotate around the circular table (31) during lifting and lowering adjustment.

2. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 1, characterized in that: The driving mechanism (4) comprises a threaded rod (41), a square rod (42) and a driving device (5); The square rod (42) is vertically fixed at the center of the tank body (2), and the threaded rod (41) is vertically rotatably installed in the tank body (2) on one side of the square rod (42); The circular table (31) is provided with a vertically penetrating sliding groove (311) and a threaded hole (312); The threaded rod (41) is thread-matched and installed through the threaded hole (312), and the square rod (42) is slidably installed through the slide groove (311); The driving device (5) is provided on the top of the tank body (2) and is used to drive the threaded rod (41) to rotate in a forward or reverse direction.

3. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 2, characterized in that: 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 truncated table (31) is provided with a bracket A (351) and a bracket 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) accordingly; A transmission gear (354) and a rotating shaft (355) are rotatably mounted on the side of the bracket B (353), and the transmission gear (354) is correspondingly engaged with the gear 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) is correspondingly engaged with the transmission gear (354); A bevel gear ring (357) is fixed to the periphery of the top surface of the truncated cone (31), and the bevel gear ring (357) is correspondingly engaged with the bevel gear (356).

4. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 2, characterized in that: The heating device includes a heating rod A (6) and a plurality of heating rods B (62); The heating rod A (6) is vertically arranged near the middle of the tank body (2); Ring frames (61) are fixed on the inner wall of the tank body (2) near the top and bottom ends thereof; A plurality of heating rods B (62) are fixed in a ring array between the two ring frames (61); The heating rod A (6) and the heating rod B (62) form an inner and outer convective heat field.

5. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 4, characterized in that: A vertically extending inner cavity (421) is provided in the square rod (42), and the heating rod A (6) is vertically installed in the inner cavity (421).

6. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 1, characterized in that: A secondary rod (34) is fixed to the end of each stirring rod (33) away from the annular member (32).

7. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 6, characterized in that: A plurality of mounting cylinders (331) are evenly distributed and fixed on the outer peripheral wall of the annular member (32), and each of the stirring rods (33) is correspondingly rotatably mounted in the mounting cylinder (331); A traction rod (332) is coaxially fixed to the end surface of the stirring rod (33) located inside the mounting tube (331); a plurality of springs (333) extending radially along the mounting tube (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 tube (331); Each of the auxiliary rods (34) is provided with a ball cavity (341) at both ends, a rolling ball (342) is installed in each of the ball cavities (341), and each of the rolling balls (342) is exposed to the outside of the auxiliary rod (34); The two rolling balls (342) are distributed at two diagonal portions at both ends of the cross section of the auxiliary rod (34).

8. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 2, characterized in that: The driving 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), and a rack B (53) is fixedly mounted on the telescopic end of the telescopic cylinder A (51) via a connecting arm (52), and the rack B (53) is arranged parallel to the telescopic cylinder A (51); The top end of the threaded rod (41) extends through the top of the tank body (2) and is fixedly mounted with the driven gear B (54), and the driven gear B (54) is correspondingly engaged with the rack B (53); The connecting arm (52) is composed of a connecting rod (523) and a connecting plate A (521) and a connecting plate 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).

9. The aromatic hydrocarbon separation device for preparing a high-boiling-point aromatic hydrocarbon solvent according to claim 8, characterized in that: A liquid level sensor (8) is installed on the top wall of the tank body (2), and a control box (9) is installed on the outside of the tank body (2) via a support frame; A mounting plate (71) is fixed to the side of the connecting plate B (522), a telescopic cylinder B (7) parallel to the telescopic cylinder A (51) is fixed to the mounting plate (71), and a micro-touch switch (72) is installed on the end of the telescopic rod of the telescopic cylinder B (7); A touch plate (73) that cooperates with the micro-touch switch (72) to trigger is fixed on the top of the tank body (2); Wherein, 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 A (51) is controlled by the control box (9).

10. An aromatic hydrocarbon separation method for producing a high-boiling-point aromatic hydrocarbon solvent, based on the aromatic hydrocarbon separation device for producing a high-boiling-point aromatic hydrocarbon solvent according to any one of claims 1 to 9, 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 body (2) through the feed pipe (21), heated by a heating device, and stirred by the stirring mechanism (3) while being heated; The liquid material is heated and vaporized in the tank body (2) to form steam material, and the steam material flows back into the separation tower (1) through the gas 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 solvent component with a high boiling point gradually condenses and is enriched in the tower, and is finally discharged through the outlet of the separation tower (1), thereby achieving the separation and production of the high boiling point solvent. The driving mechanism (4) drives the stirring mechanism (3) to move up and down to achieve a longitudinal dynamic stirring effect; The heating device cooperates with the longitudinal dynamic stirring mechanism of the stirring mechanism (3) to form a three-dimensional heat flow network in the tank body (2).

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