An extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction

Abstract

This invention discloses an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction, relating to the field of supercritical extraction technology. It includes an extraction vessel shell with an inlet pipe and an outlet pipe. An extraction inner cylinder is located inside the extraction vessel shell and is used to store tobacco. The top of the extraction vessel shell is open, and a sealing cap is installed on the extraction vessel shell, positioned inside the opening to limit the movement of the extraction inner cylinder. This invention divides the extraction vessel into two parts: the extraction vessel shell and the extraction inner cylinder, separating the tobacco extraction from the extraction vessel. In this method, the extraction inner cylinder filled with tobacco can be removed from the extraction vessel shell for cleaning. Furthermore, this method allows for the use of multiple extraction inner cylinders, meaning that the efficiency of tobacco extraction can be maintained by replacing the extraction inner cylinder, reducing the reduction in extraction efficiency caused by cleaning the extraction vessel.

Description

Technical Field

[0001] This invention relates to the field of supercritical extraction technology, specifically to an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction. Background Technology

[0002] Tobacco essential oils are important flavoring ingredients for cigarettes and new tobacco products, containing various volatile aroma components such as solanone, megastigmatrienone, and neophytadiene. Supercritical CO2 extraction technology, due to its advantages such as low operating temperature, no organic solvent residue, and adjustable selectivity, has become one of the preferred methods for preparing high-quality tobacco essential oils.

[0003] Currently, most industrial extraction vessels used for supercritical CO2 extraction of tobacco essential oils are vertical cylindrical structures with simple sieves or directly filled with loose tobacco dust. However, some problems exist in actual operation: tobacco flakes or tobacco dust are easily compacted under gravity, and CO2 fluid forms channels along the path of least resistance, resulting in insufficient extraction of most materials, over-extraction of some materials, and poor batch stability of essential oils.

[0004] Meanwhile, the extracted wet tobacco dust is prone to clumping and hardening under high pressure. Because the clumped tobacco is tightly attached to the inner wall of the equipment and the block structure is compact, the cleaning work becomes extremely complicated and tedious, requiring a lot of manpower and time to break it up and clear it, which affects production efficiency.

[0005] Therefore, we propose an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction, in order to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction. It achieves a separable structure between the inner extraction cylinder and the vessel body, dynamic stirring of tobacco materials and pulse disturbance of airflow, thereby improving the uniformity of extraction and ease of cleaning, thus solving the problems of difficult cleaning, uneven fluid distribution and low extraction efficiency of traditional devices.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction, comprising an extraction vessel shell, wherein an air inlet pipe and an air outlet pipe are provided on the extraction vessel shell, characterized in that: it further comprises an extraction inner cylinder, which is detachably disposed inside the extraction vessel shell for independently storing tobacco, so that it can be removed for cleaning or replacement after extraction is completed; A sealing cap is provided at the top opening of the extraction vessel shell to limit and seal the inner extraction cylinder inside the extraction vessel shell during extraction. A stirring element is provided on the inner extraction cylinder to stir the tobacco inside the inner extraction cylinder during the extraction process, thereby breaking the compaction of the tobacco and displacing the material. A drive assembly, mounted on the outer shell of the extraction vessel, is used to drive the stirring element to rotate.

[0008] Preferably, the drive assembly includes a rotating spindle and rotating fan blades; The rotating main shaft is rotatably mounted on the outer shell of the extraction vessel. A connecting groove is provided at the top end of the rotating main shaft. The rotating fan blade is sleeved below the rotating main shaft and located in the airflow path of the air inlet pipe.

[0009] Preferably, the stirring component includes a stirring rod and a spiral blade. The stirring rod is rotatably mounted on the inner extraction cylinder, and its bottom end extends to the outside of the inner extraction cylinder and is fitted with a connecting joint. The spiral blade is disposed on the stirring rod. The connecting joint is detachably inserted into the connecting groove for use in removing or placing the inner extraction cylinder entirely from or into the outer shell of the extraction vessel.

[0010] Preferably, the inner extraction cylinder is further provided with a sleeve sleeve, which is sleeved on the outside of the stirring rod and the spiral blade; The bottom end of the sleeve is provided with a scraping blade, the outer ring of which contacts the inner wall of the extraction inner cylinder, and is used to scrape off residual tobacco adhering to the inner wall of the extraction inner cylinder when the sleeve is moved upward. The sleeve is provided with a material conveying groove for the circulation of tobacco inside and outside the sleeve; When the spiral blades rotate, the tobacco at the bottom of the extraction inner cylinder is conveyed upward along the sleeve to the top, thereby achieving material displacement.

[0011] Preferably, the stirring rod has an inner cavity for guiding air, and the stirring rod has a first air guide hole located inside the sleeve. The stirring rod also has a second air guide hole located outside the sleeve. The airflow inside the extraction vessel shell enters the inner cavity for guiding air through the second air guide hole, and then acts on the tobacco inside the sleeve through the first air guide hole.

[0012] Preferably, the stirring rod has an internal air guiding cavity, and the stirring rod has an air guiding hole one and an air guiding hole two. The air guiding hole one and the air guiding hole two are located inside and outside the sleeve, respectively, so that part of the CO2 airflow enters the air guiding cavity through the air guiding hole two, and then impacts the tobacco in the sleeve through the air guiding hole one, so as to help disperse the tobacco.

[0013] Preferably, an arc-shaped baffle is installed below the extraction inner cylinder, and the inner ring of the arc-shaped baffle contacts the outer wall of the stirring rod; The stirring rod has multiple air passages circumferentially arranged on it. When the stirring rod rotates, the arc-shaped baffle intermittently blocks the air passages, and the pulsed airflow wave inside the air passage impacts and disperses the tobacco.

[0014] Preferably, the sleeve is provided with an air-blowing component; An air vent is provided at the top of the stirring rod, and an adjustment groove is provided on the inner wall of the air vent. The air-blowing assembly also includes an air-blowing cylinder, an I-shaped frame, and an adjusting spring; The air-blowing cylinder is mounted on the sleeve. The top of the I-shaped frame is slidably connected to the inner wall of the air-blowing cylinder, and its bottom is in contact with the inner wall of the air-blowing groove. The adjusting spring is installed between the air-blowing cylinder and the top of the I-beam frame; A connecting rod is installed at the bottom end of the I-shaped frame, and the connecting rod extends into the adjusting groove; The bottom surface of the adjustment groove is inclined, so that when the stirring rod rotates, the connecting rod drives the I-shaped frame to move up and down reciprocally, generating auxiliary airflow fluctuations inside the sleeve to disperse the tobacco.

[0015] Preferably, a ball bearing is embedded at the end of the connecting rod that contacts the adjusting groove to form a rolling contact.

[0016] Preferably, the stirring rod is further provided with a third air guide hole, which is located above the I-shaped frame; The air guide hole three corresponds to the position of the material conveying groove on the sleeve, and is used to guide the airflow to the material conveying groove when the I-shaped frame moves up and down, so as to prevent the material conveying groove from being blocked.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention, by setting up a stirring component consisting of a stirring rod, a spiral blade, and a sleeve, and by conveying the tobacco at the bottom of the extraction inner cylinder to the top along the sleeve when the spiral blade rotates, achieves the circulation and replacement of materials in the extraction inner cylinder. This fundamentally destroys the compacted state of the tobacco and avoids the formation of channels in the CO2 fluid. Compared with the uneven extraction caused by the static accumulation of tobacco in the prior art, this invention enables the material to fully and uniformly contact with supercritical CO2, which significantly improves the uniformity of extraction and the batch stability of essential oils. This invention creates a gas-guiding cavity inside the stirring rod, and sets gas-guiding holes one and two inside and outside the sleeve, respectively. An arc-shaped baffle plate located below the extraction inner cylinder intermittently blocks gas-guiding hole two, generating pulsed airflow fluctuations within the gas-guiding cavity. This impacts the tobacco inside the sleeve, dynamically dispersing agglomerated tobacco and enhancing mass transfer. Compared to existing technologies where CO2 airflow enters smoothly from the bottom of the vessel and easily short-circuits along the path of least resistance, this invention precisely guides the airflow to the conveyed tobacco and forms pulsed impacts, significantly improving the contact efficiency and dispersing effect between the airflow and the material. This invention, by setting an air-blowing assembly consisting of an air-blowing cylinder, an I-beam frame, an adjusting spring, and a connecting rod on the sleeve, and by using the inclined adjusting groove in the air-blowing groove at the top of the stirring rod to drive the I-beam frame to move up and down reciprocally, generates auxiliary airflow fluctuations within the sleeve while intermittently directing the airflow through the air guide holes and the three-way guide material conveying channel. This has the effect of further dispersing the tobacco and preventing the material conveying channel from becoming blocked. Compared with the prior art where the material conveying channel is easily blocked by compacted tobacco, affecting normal operation, this invention achieves self-cleaning and auxiliary dispersing without external power, ensuring the continuity and stability of extraction. Attached Figure Description

[0018] Figure 1 This is a perspective view of the extraction vessel used in the preparation of tobacco essential oil by supercritical CO2 extraction according to the present invention. Figure 2 This is a three-dimensional view of another structure in the extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to the present invention. Figure 3 This is a schematic cross-sectional view of the extraction vessel used in the present invention for preparing tobacco essential oil by supercritical CO2 extraction. Figure 4 for Figure 3 The diagram shows an enlarged view of part A. Figure 5 for Figure 3 The diagram shows an enlarged view of part B. Figure 6 This is a schematic diagram of the connection structure between the rotating main shaft and the stirring rod in an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to the present invention. Figure 7 This is a schematic diagram of the stirring rod and spiral blades in an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to the present invention. Figure 8 This is a schematic diagram of the gas-blowing cylinder, I-beam frame, connecting rod, and adjusting spring in an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to the present invention.

[0019] In the diagram: 1. Extraction vessel outer shell; 2. Inlet pipe; 3. Outlet pipe; 4. Inner extraction cylinder; 5. Rotating main shaft; 6. Rotating fan blade; 7. Connecting groove; 8. Stirring rod; 9. Connecting joint; 10. Spiral blade; 11. Inner cavity for gas guiding; 12. Gas guiding hole one; 13. Gas guiding hole two; 14. Sleeve sleeve; 15. Scraper; 16. Sealing cap; 17. Sealing cap; 18. Filter pad; 19. Arc-shaped baffle; 20. Gas blowing groove; 21. Gas blowing cylinder; 22. I-beam frame; 23. Adjusting spring; 24. Adjusting groove; 25. Connecting rod; 26. Gas guiding hole three; 27. Diverter cap; 28. Flat baffle. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1-8 As shown, this embodiment discloses an extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction, including an extraction vessel shell 1. The extraction vessel shell 1 is provided with an air inlet pipe 2 and an air outlet pipe 3. Both the air inlet pipe 2 and the air outlet pipe 3 are provided with solenoid valves. The pressure inside the extraction vessel can be controlled by the solenoid valves, which facilitates the extraction of tobacco. The extraction vessel shell 1 is provided with an extraction inner cylinder 4, which is used to store tobacco. By dividing the extraction vessel into two parts, the extraction vessel shell 1 and the extraction inner cylinder 4, the extraction of tobacco is separated from the extraction vessel. The extraction inner cylinder 4 filled with tobacco is taken out from the extraction vessel shell 1 for cleaning. In this way, multiple extraction inner cylinders 4 can be set. That is, the efficiency of tobacco extraction can be ensured by replacing the extraction inner cylinder 4, and the reduction of extraction efficiency caused by cleaning the extraction vessel is reduced. The top of the extraction vessel shell 1 is set with an opening, and a sealing cover 16 is provided on the extraction vessel shell 1. The sealing cover 16 is set inside the opening. Specifically, the sealing cover 16 is connected to the inner wall of the opening by a threaded connection to limit the extraction inner cylinder 4. The sealing cover 16 is used to seal the top of the extraction vessel shell 1 to ensure the sealing of the entire tobacco extraction. The sealing cover 16 is provided with a through hole to facilitate the operator to rotate the sealing cover 16 with external tools. The extraction inner cylinder 4 is equipped with a stirring element, which is used to stir the tobacco inside the extraction inner cylinder 4. The extraction vessel outer shell 1 is equipped with a driving assembly, which is used to drive the stirring element to rotate. In this embodiment of the invention, a diversion cover 27 is installed at the bottom of the extraction vessel shell 1, and the air inlet pipe is connected to the diversion cover 27. Multiple connecting through holes 1 are opened at the bottom of the extraction vessel shell, and all of the multiple connecting through holes 1 are connected to the diversion cover 27. This allows the airflow entering the extraction vessel shell 1 to be diverted, ensuring the stability of the airflow on the rotating fan blade 6 and ensuring the rotation effect of the rotating fan blade 6. Multiple connecting through holes 2 are opened at the bottom of the extraction inner cylinder 4, and multiple connecting through holes 3 are opened on the scraper blade 15. CO2 can flow stably through the connecting through holes 1, 2, and 3. A sealing cover 17 is threadedly installed at the top of the extraction inner cylinder 4. The sealing cover 17 is used to press down on the sleeve 14 to ensure the stable installation of the sleeve 14. Meanwhile, the sealing cover 17 can also increase the sealing of the sleeve 14. The sealing cover 17 is provided with an extraction groove. The inner walls on both sides of the extraction groove are provided with inner grooves. The operator only needs to extend the T-shaped rod into the extraction groove and rotate it at a certain angle to limit the extraction inner cylinder 4. Then, the extraction inner cylinder 4 can be taken out from the extraction vessel shell 1 by simply pulling it upward.

[0022] The drive assembly consists of a rotating main shaft 5 and rotating fan blades 6. The rotating main shaft 5 is rotatably mounted on the outer shell 1 of the extraction vessel, and the rotating fan blades 6 are sleeved below the rotating main shaft 5. A connecting groove 7 is provided at the top of the rotating main shaft 5. With the cooperation of the sleeve 14, the tobacco at the bottom of the extraction inner cylinder 4 is transported to the top of the extraction inner cylinder 4, completing the displacement of the tobacco position. This avoids over-extraction of tobacco at the bottom and insufficient extraction of tobacco at the top, ensuring the extraction effect of the tobacco. At the same time, the driving of the stirring assembly is achieved by using the rotating main shaft 5 and rotating fan blades 6, driven by the flow of CO2. This method reflects the automation of the extraction vessel and also ensures the sealing of the extraction vessel, ensuring production safety.

[0023] The stirring element consists of a stirring rod 8 and a spiral blade 10. The stirring rod 8 is rotatably mounted on the extraction inner cylinder 4, and the bottom end of the stirring rod 8 extends to the outside of the extraction inner cylinder 4. The spiral blade 10 is disposed on the stirring rod 8, and a connecting joint 9 is installed at the bottom end of the stirring rod 8. The connecting joint 9 extends into the connecting groove 7 and is adapted to the connecting groove 7. In this embodiment of the invention, the connecting joint 9 is a hexagonal screw head, and the connecting groove 7 is a hexagonal groove, thereby ensuring that the connecting joint 9 can stably drive the stirring rod 8 to rotate.

[0024] The extraction inner cylinder 4 is provided with a sleeve 14, which is sleeved on the stirring element. The bottom end of the sleeve 14 is provided with a scraper 15. The outer ring of the scraper 15 contacts the inner wall of the extraction inner cylinder 4. While the sleeve 14 is moved, the scraper 15 scrapes and cleans the inner wall of the extraction inner cylinder 4. The sleeve 14 is provided with a material conveying channel for tobacco to enter and exit inside the sleeve 14. In this embodiment of the invention, a filter pad 18 is provided at the bottom of the scraper 15. The filter pad 18 is used to support the tobacco and prevent the tobacco from falling into the outer shell 1 of the extraction vessel.

[0025] The stirring rod 8 has an inner air guiding cavity 11 and an air guiding hole 12 located inside the sleeve 14. The stirring rod 8 also has an outer air guiding hole 13 located outside the sleeve 14. The airflow inside the extraction vessel shell 1 enters the inner air guiding cavity 11 through the outer air guiding hole 13 and then acts on the tobacco inside the sleeve 14 through the outer air guiding hole 12.

[0026] An arc-shaped shielding plate 19 is installed on the extraction inner cylinder 4. The arc-shaped shielding plate 19 is located below the extraction inner cylinder 4, and the inner ring of the arc-shaped shielding plate 19 is in contact with the outer wall of the stirring rod 8. During the rotation of the stirring rod 8, since multiple air guide holes 13 are arranged in an arc shape on the stirring rod 8, as the stirring rod 8 rotates, the multiple air guide holes 13 intermittently contact the arc-shaped shielding plate 19. Thus, the arc-shaped shielding plate 19 can intermittently cover and block the air guide holes 13, causing airflow fluctuations in the air guide cavity 11. In this embodiment of the invention, a flat shielding plate 28 is provided on the connecting joint 9. The flat shielding plate is used to block the connecting holes 2. As the flat shielding plate 28 moves, it can intermittently block the corresponding connecting holes 2, thereby generating airflow fluctuations, which in turn impact the tobacco.

[0027] The sleeve 14 is provided with an air blowing component, the top of the stirring rod 8 is provided with an air blowing groove 20, and the inner wall of the air blowing groove 20 is provided with an adjustment groove 24. The air-blowing assembly consists of an air-blowing cylinder 21, an I-shaped frame 22, and an adjusting spring 23. The air-blowing cylinder 21 is mounted on the sleeve 14 and has ventilation holes to ensure the movement of the I-shaped frame 22. The I-shaped frame 22 is mounted on the air-blowing cylinder 21, with its top slidably connected to the inner wall of the air-blowing cylinder 21 and its bottom contacting the inner wall of the air-blowing groove 20. In actual use, a rubber sleeve is fitted on the outer surface of the bottom of the I-shaped frame 22 to improve the tightness of the connection between the I-shaped frame 22 and the air-blowing groove 20, while ensuring the impact effect of the airflow. The adjusting spring 23 is mounted on the air-blowing cylinder 21. One end of the adjusting spring 23 is connected to the top of the I-shaped frame 22. A connecting rod 25 is installed at the bottom end of the I-shaped frame 22. The bottom end of the connecting rod 25 extends into the adjusting groove 24 and contacts the inner wall of the adjusting groove 24. A ball is embedded at the end of the connecting rod 25 that contacts the bottom inner wall of the adjusting groove 24. The ball changes the contact method between the connecting rod 25 and the bottom inner wall of the adjusting groove 24 to a rolling connection. In this embodiment of the invention, the connection between the connecting rod 25 and the inner wall of the adjusting groove 24 is set to a rolling connection to ensure the service life of the connecting rod 25 and reduce frictional loss. At the same time, the bottom inner wall of the adjusting groove 24 is inclined, so that when the connecting rod 25 rotates with the stirring rod 8, the adjusting groove 24 pushes the I-shaped frame 22 to move up and down.

[0028] The stirring rod 8 is provided with an air guide hole 26, which is located above the I-shaped frame 22. The air guide hole 26 is adapted to the material conveying channel. In this invention, the air guide hole 26 is used to provide air to the top of the I-shaped frame 22 during the movement of the I-shaped frame 22. At the same time, during the movement of the I-shaped frame 22, the airflow above the I-shaped frame is discharged through the air guide hole 26. This airflow will act on the material conveying channel, thereby preventing the material conveying channel from being blocked.

[0029] In this embodiment of the invention, air guide hole 12, air guide hole 13 and air guide hole 26 are all provided with filter screens, which are used to filter and block the tobacco.

[0030] The entire process of the device is as follows: Before tobacco extraction, the inner extraction cylinder 4 is separated from the outer shell 1 of the extraction vessel. First, tobacco is filled in by installing the filter pad 18 at the bottom of the scraper 15, then fitting the sleeve 14 onto the stirring rod 8, and then filling the inner extraction cylinder 4 with tobacco fragments. After the tobacco filling is completed, the top of the inner extraction cylinder 4 is sealed with the sealing cap 17. At the same time, the sealing cap 17 applies downward pressure to the sleeve 14 to ensure the installation stability of the sleeve 14. This completes the tobacco filling.

[0031] During operation, the extraction inner cylinder 4 filled with tobacco is placed into the extraction vessel outer shell 1, and the connecting joint 9 at the bottom of the stirring rod 8 is connected to the connecting groove 7 on the rotating main shaft 5 to ensure that the drive component can drive the stirring rod 8 to rotate. Then, the sealing cover 16 is installed on the extraction vessel outer shell 1 to complete the fixation and sealing of the extraction inner cylinder 4. CO2 is introduced into the diversion cover 27 through the air inlet pipe 2, and then discharged into the extraction vessel outer shell 1 through the connecting through hole. During the flow of CO2, the rotating fan blade 6 is driven to rotate, thereby driving the stirring rod 8 to rotate. The stirring rod 8 drives the spiral blade 10 to rotate. With the cooperation of the sleeve 14, the tobacco fragments at the bottom are transported upward to the top, realizing the circulation and replacement of tobacco materials, avoiding the "channeling" phenomenon, and improving the extraction uniformity. The extracted CO2 carrying essential oil components is discharged from the air outlet pipe 3, completing the tobacco extraction operation.

[0032] After extraction is complete, remove the sealing cap 16, take out the extraction inner cylinder 4, open the sealing cap 17, pull up the sleeve 14, and scraper 15 simultaneously clean the residual tobacco on the inner wall of the extraction inner cylinder 4 to achieve rapid unloading and cleaning.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction, comprising an extraction vessel shell (1), wherein an air inlet pipe (2) and an air outlet pipe (3) are provided on the extraction vessel shell (1), characterized in that: It also includes an extraction inner cylinder (4), which is detachably installed inside the extraction vessel shell (1) for storing tobacco independently so that it can be removed for cleaning or replacement after extraction is completed; A sealing cap (16) is provided at the top opening of the extraction vessel shell (1) to limit and seal the extraction inner cylinder (4) inside the extraction vessel shell (1) during extraction. A stirring element is provided on the extraction inner cylinder (4) to stir the tobacco in the extraction inner cylinder (4) during the extraction process, so as to break the compaction state of the tobacco and realize the displacement of the material position; A drive assembly, mounted on the outer shell (1) of the extraction vessel, is used to drive the stirring element to rotate.

2. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 1, characterized in that: The drive assembly includes a rotating spindle (5) and rotating fan blades (6). The rotating main shaft (5) is rotatably mounted on the outer shell (1) of the extraction vessel. A connecting groove (7) is provided at the top of the rotating main shaft (5). The rotating fan blade (6) is sleeved below the rotating main shaft (5) and located on the airflow path of the air inlet pipe (2).

3. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 2, characterized in that: The stirring component includes a stirring rod (8) and a spiral blade (10). The stirring rod (8) is rotatably mounted on the extraction inner cylinder (4), and its bottom end extends to the outside of the extraction inner cylinder (4) and is equipped with a connecting joint (9). The spiral blade (10) is disposed on the stirring rod (8). The connecting joint (9) is detachably inserted into the connecting groove (7) to allow the extraction inner cylinder (4) to be removed or placed entirely from the extraction vessel shell (1).

4. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 3, characterized in that: The extraction inner cylinder (4) is also provided with a sleeve (14), which is sleeved on the outside of the stirring rod (8) and the spiral blade (10); The bottom end of the sleeve (14) is provided with a scraping blade (15), the outer ring of which contacts the inner wall of the extraction inner cylinder (4) and is used to scrape off the residual tobacco adhering to the inner wall of the extraction inner cylinder (4) when the sleeve (14) is moved upward. The sleeve (14) is provided with a material conveying groove for the circulation of tobacco inside and outside the sleeve (14); When the spiral blade (10) rotates, it conveys the tobacco at the bottom of the extraction inner cylinder (4) upward along the sleeve cylinder (14) to the top, thereby realizing the replacement of the material position.

5. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 4, characterized in that: The stirring rod (8) has an internal air guiding cavity (11) and an air guiding hole one (12) and an air guiding hole two (13) on the stirring rod (8). The air guiding hole one (12) and the air guiding hole two (13) are located inside and outside the sleeve (14) respectively, so that part of the CO2 airflow enters the air guiding cavity (11) through the air guiding hole two (13), and then impacts the tobacco in the sleeve (14) through the air guiding hole one (12) to help disperse the tobacco.

6. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 5, characterized in that: An arc-shaped baffle plate (19) is installed below the extraction inner cylinder (4), and the inner ring of the arc-shaped baffle plate (19) is in contact with the outer wall of the stirring rod (8). The stirring rod (8) has multiple air passages (13) circumferentially arranged on it. When the stirring rod (8) rotates, the arc-shaped shield (19) intermittently blocks the air passages (13), and the air passages (11) generate pulsed airflow fluctuations to impact and disperse the tobacco.

7. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 6, characterized in that: An air-blowing assembly is provided on the sleeve (14); An air vent (20) is provided at the top of the stirring rod (8), and an adjustment groove (24) is provided on the inner wall of the air vent (20). The air-blowing assembly also includes an air-blowing cylinder (21), an I-beam frame (22), and an adjusting spring (23). The air-blowing cylinder (21) is installed on the sleeve (14); The top of the I-shaped frame (22) is slidably connected to the inner wall of the air-blowing cylinder (21), and its bottom is in contact with the inner wall of the air-blowing groove (20). The adjusting spring (23) is installed between the top of the air-blowing cylinder (21) and the I-beam frame (22); A connecting rod (25) is installed at the bottom end of the I-shaped frame (22), and the connecting rod (25) extends into the adjusting groove (24); The bottom surface of the adjustment groove (24) is inclined, so that when the stirring rod (8) rotates, the connecting rod (25) drives the I-shaped frame (22) to move up and down repeatedly, and the auxiliary airflow wave inside the sleeve (14) disperses the tobacco.

8. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 7, characterized in that: The end of the connecting rod (25) that contacts the adjusting groove (24) is fitted with a ball bearing to form a rolling contact.

9. The extraction vessel for preparing tobacco essential oil using supercritical CO2 extraction according to claim 8, characterized in that: The stirring rod (8) is also provided with a three-way air guide hole (26), which is located above the I-shaped frame (22); The air guide hole three (26) corresponds to the material conveying groove on the sleeve (14) and is used to guide the airflow to the material conveying groove when the I-shaped frame (22) moves up and down, so as to prevent the material conveying groove from being blocked.

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