A hexane separator with a segmented jacketed heating structure

Abstract

This utility model discloses a hexane separator with a segmented jacketed heating structure, relating to the field of chemical equipment technology. It includes a tank body with a heating jacket fixedly connected to its exterior. A material inlet is welded to the left side of the tank body, and a segmented heating assembly with a partition plate is installed inside the heating jacket. This hexane separator with a segmented jacketed heating structure, by comprising a tank body, a heating jacket, a material inlet, a steam inlet, a steam outlet, and an annular partition plate, allows high-temperature steam to enter the heating jacket along the steam inlet during operation, heating the tank body and causing rapid evaporation of the liquid material. The annular partition plate divides the interior of the heating jacket into multiple heating zones, allowing for the frequent injection of high-temperature steam at different temperatures. Precise temperature control improves flash evaporation efficiency, achieving segmented heating and precise temperature control, thus solving the problems of incomplete separation and high by-product residue in the equipment.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a hexane separator with a segmented jacketed heating structure. Background Technology

[0002] From 2020 to 2025, the demand for high-end polyolefins in China is projected to grow at an average annual rate of 7%, with the self-sufficiency rate increasing from 52% to 60%. This includes polyethylene, POE, and EVA, which are widely used in new energy vehicles, energy storage, and photovoltaics. Domestic olefin projects are continuously expanding their polyethylene production capacity. A large domestic chemical company has extended its industrial chain to the high-end polyolefin sector, constructing a new 800,000-ton olefin project with a polyethylene unit using the Hostalen ACP low-pressure slurry process. This process can produce multimodal HDPE resin. In this process, hexane is used as the reaction solvent, and the polymerized slurry requires solid-liquid separation to recover hexane and obtain polyethylene powder. In the Hostalen process, mother liquor separation is achieved through multi-stage equipment, with hexane separation tanks performing flash evaporation and gravity sedimentation separation to recover hexane. The current problems with hexane separators include: residual hexane levels >500 ppm during recovery reduce the quality of polyethylene powder, and residual solvents volatilize in the storage tank to form VOCs, requiring additional treatment; during hexane recovery, polyethylene fines and byproduct wax are carried along, which accumulate on the tank wall and downstream heat exchangers and filters over a long period of time, resulting in a reduction in flow cross-sectional area and a decrease in heat exchange efficiency.

[0003] Now, a novel hexane separator with a segmented jacketed heating structure is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a hexane separator with a segmented jacketed heating structure to solve the problems of incomplete separation and large amount of by-product residue mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hexane separator with a segmented jacketed heating structure, comprising a tank body, a heating jacket fixedly connected to the outside of the tank body, a material inlet welded to the left side of the tank body, a liquid material outlet fixedly connected to the middle position of the bottom of the tank body, a vertical slurry channel connected to the bottom flange of the liquid material outlet, a horizontal slurry channel welded to the bottom of the vertical slurry channel, a manhole welded to the right side of the tank body, a sealing cover fixedly connected to the right side of the manhole, a gas phase outlet provided at the top of the tank body, an external insulation sleeve fitted over the vertical and horizontal slurry channels, a steel coil provided inside the external insulation sleeve, a steam inlet provided at the top right side of the steel coil, a steam outlet provided at the bottom left side of the steel coil, and a segmented heating assembly provided inside the heating jacket.

[0006] The heating assembly includes multiple steam inlets, which are welded to the front end of the heating jacket. Multiple steam outlets are welded to the rear end of the heating jacket, and multiple annular partition plates are welded to the inner wall of the heating jacket.

[0007] As a further technical solution of this utility model, the inner diameters of the steam inlet and the steam outlet are the same, and the interiors of the heating jacket, the steam inlet, and the steam outlet are connected.

[0008] As a further technical solution of this utility model, the tank body and the material inlet are tangent to each other, and the interiors of the tank body and the material inlet are connected.

[0009] As a further technical solution of this utility model, the inner diameter of the annular partition plate is adapted to the outer diameter of the tank, and the inner wall of the annular partition plate is welded and fixed to the outer wall of the tank.

[0010] As a further technical solution of this utility model, the vertical center lines of the tank body and the annular partition plate coincide, and the top of the annular partition plate and the bottom of the steam outlet are flush.

[0011] As a further technical solution of this utility model, the steel coil, steam inlet, and steam outlet are internally connected, and the steel coil is wound around the outside of the vertical slurry flow channel.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the hexane separator with a segmented jacket heating structure not only realizes the function of segmented heating and precise temperature control, but also realizes the function of auxiliary heating of the slurry flow channel;

[0013] (1) By setting up a tank body, heating jacket, material inlet, steam inlet, steam outlet and annular partition plate, when in use, the mother liquor of the material enters the tank body tangentially from the material inlet, the pressure drops suddenly and the hexane is vaporized instantly, the gas phase material is discharged from the gas phase outlet, and some liquid material swirls along the inner wall of the tank and fully contacts the inner wall of the tank. High temperature steam enters the heating jacket along the steam inlet to heat the tank body and make the liquid material evaporate quickly. The annular partition plate divides the interior of the heating jacket into multiple heating zones. High temperature steam of different temperatures can be injected according to the actual situation. The flash evaporation efficiency is improved by precise temperature control and waxing is reduced. The steam outlet is used to discharge steam and condensate, which facilitates steam circulation and realizes the function of segmented heating and precise temperature control.

[0014] (2) By setting up an external insulation sleeve, steel coil, steam inlet and steam outlet, when in use, some of the unvaporized liquid material flows back down along the vertical slurry channel and the horizontal slurry channel, which facilitates subsequent recirculation. High temperature and low pressure steam enters along the steam inlet, passes through the steel coil and is discharged along the steam outlet, realizing steam circulation. High temperature and low pressure steam heats the vertical slurry channel through the steel coil, so that the liquid material continues to evaporate and separate, further improving the separation efficiency and realizing the function of auxiliary heating of the slurry channel. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present utility model;

[0016] Figure 2 This is a front view cross-sectional structural diagram of the heating jacket of this utility model;

[0017] Figure 3 This is a top view cross-sectional structural diagram of the tank body of this utility model;

[0018] Figure 4 This is a top view schematic diagram of the annular partition plate of this utility model;

[0019] Figure 5 This is a schematic diagram of the rear view structure of the tank body of this utility model;

[0020] Figure 6 This is an enlarged cross-sectional view of the external insulation sleeve of this utility model.

[0021] In the diagram: 1. Tank body; 2. Heating jacket; 3. Material inlet; 4. Steam inlet; 5. Steam outlet; 6. Annular partition plate; 7. Liquid material outlet; 8. Vertical slurry channel; 9. Horizontal slurry channel; 10. External insulation sleeve; 11. Steel coil; 12. Steam inlet; 13. Steam outlet; 14. Manhole; 15. Sealing cover; 16. Gas phase outlet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example: Please refer to Figure 1-6A hexane separator with a segmented jacketed heating structure includes a tank body 1, a heating jacket 2 fixedly connected to the outside of the tank body 1, a material inlet 3 welded to the left side of the tank body 1, a liquid material outlet 7 fixedly connected to the middle position of the bottom end of the tank body 1, a vertical slurry flow channel 8 connected to the bottom flange of the liquid material outlet 7, a horizontal slurry flow channel 9 welded to the bottom end of the vertical slurry flow channel 8, a manhole 14 welded to the right side of the tank body 1, a sealing cover 15 fixedly connected to the right side of the manhole 14, a gas phase outlet 16 provided at the top of the tank body 1, and a segmented heating component provided inside the heating jacket 2.

[0024] Please see Figure 1-6 A hexane separator with a segmented jacketed heating structure also includes a heating assembly, which includes multiple steam inlets 4, which are welded to the front end of the heating jacket 2, multiple steam outlets 5 are welded to the rear end of the heating jacket 2, and multiple annular partition plates 6 are welded to the inner wall of the heating jacket 2.

[0025] The inner diameters of steam inlet 4 and steam outlet 5 are the same. The interiors of heating jacket 2, steam inlet 4, and steam outlet 5 are connected. Tank 1 and material inlet 3 are tangent and connected. The inner diameter of annular partition plate 6 is matched with the outer diameter of tank 1. The inner wall of annular partition plate 6 is welded and fixed to the outer wall of tank 1. The vertical center lines of tank 1 and annular partition plate 6 coincide. The top of annular partition plate 6 is flush with the bottom of the interior of steam outlet 5. By segmented heating, the temperature control accuracy is improved, thereby improving the flash separation efficiency and reducing the generation of by-products.

[0026] Specifically, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, high-temperature steam enters the heating jacket 2 through the steam inlet 4, heating the tank 1 and causing the liquid material to evaporate quickly. The annular partition plate 6 divides the interior of the heating jacket 2 into multiple heating zones, allowing for the frequent injection of high-temperature steam at different temperatures. Precise temperature control improves flash evaporation efficiency and reduces wax deposition. The steam outlet 5 is used to discharge steam and condensate, facilitating steam circulation.

[0027] The vertical slurry channel 8 and the horizontal slurry channel 9 are fitted with an outer insulation sleeve 10. The outer insulation sleeve 10 is equipped with a steel coil 11. A steam inlet 12 is provided at the top right side of the steel coil 11, and a steam outlet 13 is provided at the bottom left side of the steel coil 11. The steel coil 11, the steam inlet 12, and the steam outlet 13 are internally connected. The steel coil 11 is wrapped around the outside of the vertical slurry channel 8. By heating the material channel, the flash separation efficiency is further improved.

[0028] Specifically, such as Figure 1 and Figure 6 As shown, high-temperature, low-pressure steam enters through the steam inlet 12, passes through the steel coil 11, and exits through the steam outlet 13, thus achieving steam circulation. The high-temperature, low-pressure steam heats the vertical slurry channel 8 through the steel coil 11, allowing the liquid material to continue to evaporate and separate, further improving the separation efficiency.

[0029] Working principle: When this utility model is in use, firstly, the mother liquor enters the tank 1 tangentially from the material inlet 3. The sudden pressure drop causes the hexane to vaporize instantly. The gaseous material is discharged from the gas outlet 16. Some of the liquid material swirls along the inner wall of the tank 1 and comes into full contact with the inner wall of the tank 1. High-temperature steam enters the heating jacket 2 through the steam inlet 4 to heat the tank 1, causing the liquid material to evaporate rapidly. The annular partition plate 6 divides the interior of the heating jacket 2 into multiple heating zones. High-temperature steam of different temperatures can be injected according to the actual situation. Precise temperature control improves flash evaporation efficiency and reduces wax deposition. The steam outlet 5 is used to discharge steam and condensate, facilitating steam circulation. Some of the unvaporized liquid material flows back down along the vertical slurry channel 8 and the horizontal slurry channel 9, facilitating subsequent recirculation. High-temperature, low-pressure steam enters through the steam inlet 12, passes through the steel coil 11, and exits through the steam outlet 13, achieving steam circulation. The high-temperature, low-pressure steam heats the vertical slurry channel 8 through the steel coil 11, allowing the liquid material to continue to evaporate and separate, further improving separation efficiency.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A hexane knockout drum having a segmented jacket heating structure, comprising a drum body (1), characterised in that: A heating jacket (2) is fixedly connected to the outside of the tank body (1). A material inlet (3) is welded to the left side of the tank body (1). A liquid material outlet (7) is fixedly connected to the middle position of the bottom end of the tank body (1). A vertical slurry channel (8) is connected to the bottom flange of the liquid material outlet (7). A horizontal slurry channel (9) is welded to the bottom end of the vertical slurry channel (8). A manhole (14) is welded to the right side of the tank body (1). A sealed door is fixedly connected to the right side of the manhole (14). The tank body (1) is sealed (15), and a gas phase outlet (16) is provided at the top of the tank body (1). An external insulation sleeve (10) is fitted around the vertical slurry channel (8) and the horizontal slurry channel (9). A steel coil (11) is provided inside the external insulation sleeve (10). A steam inlet (12) is provided at the top right side of the steel coil (11). A steam outlet (13) is provided at the bottom left side of the steel coil (11). A segmented heating component is provided inside the heating jacket (2). The heating assembly includes multiple steam inlets (4), which are welded to the front end of the heating jacket (2). Multiple steam outlets (5) are welded to the rear end of the heating jacket (2), and multiple annular partition plates (6) are welded to the inner wall of the heating jacket (2).

2. A hexane separator with a segmented jacketed heating structure according to claim 1, characterized in that: The inner diameters of the steam inlet (4) and the steam outlet (5) are the same, and the interiors of the heating jacket (2), the steam inlet (4), and the steam outlet (5) are connected.

3. A hexane separator with a segmented jacketed heating structure according to claim 1, characterized in that: The tank body (1) and the material inlet (3) are tangent to each other, and the interiors of the tank body (1) and the material inlet (3) are connected.

4. A hexane separator with a segmented jacketed heating structure according to claim 1, characterized in that: The inner diameter of the annular partition plate (6) is adapted to the outer diameter of the tank body (1), and the inner wall of the annular partition plate (6) is welded and fixed to the outer wall of the tank body (1).

5. A hexane separator with a segmented jacketed heating structure according to claim 1, characterized in that: The vertical center lines of the tank body (1) and the annular partition plate (6) are aligned, and the top of the annular partition plate (6) is flush with the bottom of the steam outlet (5).

6. A hexane separator with a segmented jacketed heating structure according to claim 1, characterized in that: The internal connections of the steel coil (11), steam inlet (12), and steam outlet (13) are made, and the steel coil (11) is wrapped around the outside of the vertical slurry channel (8).

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