A suspended point-contact type supercritical extraction device

Abstract

The present invention discloses a suspended point-contact type supercritical extraction device, belonging to the technical field of supercritical extraction. It can abandon the static extraction mode of the hanging basket in the traditional extraction kettle, utilize the deformation characteristics of the empty-throwing and material-receiving film, and perform the form of shaking and empty-throwing on the contained material to prompt the powdery material to maintain a dispersed suspended state. Then, it sequentially passes through the supercritical fluid to fully contact the material in a limited space, significantly improving the extraction rate of effective substances. And through the self-characteristics of the empty-throwing and material-receiving film and the assisting effect of the assisting hanging parts, on the one hand, it improves the dispersion effect of the material, and at the same time, it can be turned over to change the posture to contact the supercritical fluid, fully extracting the material and not easily appearing extraction dead angles. On the other hand, it can also avoid the static adhesion phenomenon of the powdery material from affecting the extraction effect. The present invention can greatly improve the single-pass extraction rate of the material and significantly improve the extraction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of supercritical extraction, and more specifically, to a suspended point-contact type supercritical extraction device. Background Art

[0002] Supercritical refers to supercritical fluid, which is a state that is neither gaseous nor liquid and is between gas and liquid. Such a substance can only exist when its temperature and pressure exceed the critical point. The density of supercritical fluid is relatively large, similar to that of a liquid, while its viscosity is closer to that of a gas. Therefore, supercritical fluid is an ideal extraction agent. In the process of pharmaceutical production, supercritical extraction equipment is generally used to extract the effective substances of Chinese herbal medicines. The principle of the supercritical carbon dioxide fluid extraction and separation process is to utilize the relationship between the solubility of supercritical fluid and its density, that is, to utilize the influence of pressure and temperature on the solubility of supercritical fluid.

[0003] The solvent strength of supercritical fluid depends on the extraction temperature and pressure. Using this characteristic, by simply changing the pressure and temperature of the extraction agent fluid, different components in the sample can be extracted successively according to their solubility in the fluid. Under low pressure, weakly polar substances are extracted first. As the pressure increases, substances with larger polarity and large molecular weight and basic properties are extracted. Therefore, by performing supercritical extraction under programmed pressure increase, different extraction components can be obtained, and at the same time, separation can also be achieved. The change in temperature is reflected in two factors: affecting the density of the extraction agent and the vapor pressure of the solute. In the low-temperature region (still above the critical temperature), increasing the temperature reduces the density of the fluid, while the increase in the vapor pressure of the solute is not much. Therefore, when the temperature is increased, the solubility of the extraction agent decreases, and the solute can precipitate from the fluid extraction agent. When the temperature further rises to the high-temperature region, although the density of the extraction agent further decreases, the vapor pressure of the solute increases, and the volatility increases. The extraction rate not only does not decrease but tends to increase.

[0004] The extraction rate of existing supercritical extraction devices generally depends on the extraction effect of the extraction kettle and the separation effect of the separator. Due to the characteristics of supercritical fluid, it is very easy to achieve a high separation rate under operations of changing temperature and pressure, and even multi-stage separation and rectification means are adopted to improve the separation effect. However, at present, most of the extraction kettles still use a simple hanging basket form to hold materials for static extraction. Due to the stacking of materials and limited space, it is difficult for the materials to come into full contact with the supercritical fluid, resulting in a low single-pass extraction rate. Often, repeated extraction or continuous countercurrent extraction methods need to be adopted to improve the extraction rate of the materials, which greatly reduces the extraction efficiency, and the extraction cost also increases accordingly. Summary of the Invention

[0005] 1. Technical Problems to be Solved

[0006] In view of the problems existing in the prior art, the object of the present invention is to provide a suspended point-contact type supercritical extraction device, which can abandon the static extraction method of the hanging basket in the traditional extraction kettle, utilize the deformation characteristics of the empty-throwing and receiving film, and perform the form of shaking and empty-throwing on the contained materials, so as to make the powdery materials maintain a dispersed suspended state, and then sequentially pass through the supercritical fluid to fully contact with the materials in a limited space, significantly improving the extraction rate of effective substances. And through the self-characteristics of the empty-throwing and receiving film and the assisting effect of the assisting hanging parts, on the one hand, the dispersion effect of the materials is improved, and at the same time, the materials can be turned over and changed in posture to contact with the supercritical fluid, so as to fully extract the materials and it is not easy to appear extraction dead angles. On the other hand, it can also avoid the static adhesion phenomenon of powdery materials from affecting the extraction effect. The present invention can greatly improve the single-pass extraction rate of materials and significantly improve the extraction efficiency.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A suspended point-contact type supercritical extraction device includes a carbon dioxide cylinder, a purifier, a condenser, a main pump, a mixer, a heater, an extraction kettle and a separator connected in sequence. The separator is also connected with a liquefaction tank, the liquefaction tank is connected with a compressor, and the compressor is connected with the carbon dioxide cylinder. A multi-layer material cylinder is installed in the extraction kettle, and a plurality of uniformly distributed distribution plates are fixedly installed in the multi-layer material cylinder. A plurality of uniformly distributed hemispherical material grooves are opened at the upper end of the distribution plate. An upflow channel penetrating the distribution plate is opened at the bottom wall of the hemispherical material groove. An empty-throwing and receiving film matching the hemispherical material groove is attached in the hemispherical material groove, and the edge of the empty-throwing and receiving film is fixedly connected to the opening of the hemispherical material groove. A material collecting cylinder fixedly connected to the upper end of the distribution plate is arranged above the hemispherical material groove. A plurality of annularly arrayed communication holes are opened on the inner side wall of the hemispherical material groove, and a connecting flow side pipe is fixedly communicated between the communication hole and the material collecting cylinder.

[0010] Furthermore, the lower end of the empty-throwing and receiving film is fixedly connected with a magnetic lifting and sealing hemisphere matching the upflow channel. The magnetic lifting and sealing hemisphere is hemispherical and has an interference fit with the upflow channel. The structural characteristics of the magnetic lifting and sealing hemisphere can facilitate the sealing of the upper opening of the upflow channel, avoid the supercritical fluid from flowing through the gap in the state where the material is not suspended and directly pass through the material collecting cylinder, resulting in a decrease in the extraction rate.

[0011] Furthermore, the magnetic lifting seal hemisphere includes a bottom base made of elastic soft material. A sealing ring part adhesively connected to the empty throwing and feeding film is fixedly connected to the upper end of the bottom base. The sealing ring part is made of heat-expandable rubber material. On the one hand, the bottom base can undergo slight deformation to better adapt to the upper opening of the upflow channel for sealing. On the other hand, it is not prone to impact damage during its reset, and at the same time, it can also reduce the noise caused by the impact. The sealing ring part expands after being heated according to the temperature characteristics of the supercritical fluid, better sealing the upper opening of the upflow channel and improving the sealing effect.

[0012] Furthermore, an annular auxiliary expansion cavity filled with carbon dioxide is formed in the sealing ring part. A plurality of uniformly distributed heat-conducting and shape-fixing rods are inlaid and inserted in the bottom base. A heat-conducting silica gel layer is filled between the bottom base and the sealing ring part, and the upper ends of the plurality of heat-conducting and shape-fixing rods all extend into the heat-conducting silica gel layer. The expansion coefficient of carbon dioxide when heated is larger than that of air, which can assist the edge of the sealing ring part to expand and improve the sealing error tolerance. In addition, even if leakage occurs, due to the same reason as the extraction medium, the interference is small. The heat-conducting and shape-fixing rods, on the one hand, act as a framework to shape the bottom base, and on the other hand, play a role in quickly conducting heat.

[0013] Furthermore, a fixed magnet is inlaid in the sealing ring part. An electromagnet installed on the material collecting cylinder is arranged directly above the fixed magnet. The electromagnets are connected in series with each other and electrically connected to a power supply. The power supply is signal-connected to a timer. The magnetic adsorption effect of the electromagnet on the fixed magnet can be used to assist the supercritical fluid to force the empty throwing and feeding film to deform so as to throw the material empty. The function of the timer can be set by the technician according to the flow rate of the fluid, and then the dynamic extraction of the material can be realized regularly.

[0014] Furthermore, a first filter screen is installed at the opening of the material collecting cylinder through a buckle, and the electromagnet is installed at the center of the first filter screen. A second filter screen is installed in the receiving flow side pipe. The first filter screen is to prevent the supercritical fluid from carrying out powdery materials, ensuring that the supercritical fluid coming out of the extraction kettle is clean and avoiding the supercritical fluid carrying material dust to pollute the subsequent pipelines, equipment and products. The second filter screen is used to prevent the materials falling after empty throwing from flowing out from the receiving flow side pipe.

[0015] Further, a plurality of staggered auxiliary driving hanging parts are fixedly connected to the inner side wall of the aggregating cylinder. The auxiliary driving hanging part includes a high-vibration elastic rod fixedly connected to the inner side wall of the aggregating cylinder. A magnetic auxiliary driving sheet is fixedly connected to one end of the high-vibration elastic rod away from the inner side wall of the aggregating cylinder. A plurality of fiber bundles are adhesively bonded to the surface of the magnetic auxiliary driving sheet. The auxiliary driving hanging part plays an auxiliary driving effect. On the one hand, it can extend the suspension time of the material, enabling it to come into contact with the supercritical fluid more fully for extraction. On the other hand, it can cause the material to turn over, improving the comprehensiveness of extraction. It can also cause dynamic resonance of the supercritical fluid, increasing its dissolution rate.

[0016] Further, the empty-throwing and material-receiving film sequentially includes a bottom film, a fiber interlayer, and a top film from outside to inside. A plurality of uniformly distributed heat-expandable balls are filled in the fiber interlayer. The empty-throwing and material-receiving film has a very high deformation strength and is not easily damaged such as torn. The heat-expandable balls use the characteristic of expanding when heated to force the top film to have local multi-point protrusions. On the one hand, it can cause the material to turn over. On the other hand, it can reduce the adhesion of the material on the top film, improving the empty-throwing effect of the empty-throwing and material-receiving film.

[0017] Further, a plurality of uniformly distributed metal patches are fixedly connected to the outer surface of the bottom film. A reset elastic wire is fixedly connected between the metal patch and the inner side wall of the hemispherical material trough. The reset elastic wire plays a role in assisting the empty-throwing and material-receiving film to reset, and at the same time plays a role in shaping the empty-throwing and material-receiving film, avoiding the problem of permanent deformation caused by long-term deformation.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] (1) This solution can abandon the static extraction method of the hanging basket in the traditional extraction kettle. Utilizing the deformation characteristics of the empty-throwing and material-receiving film, the material placed is shaken and thrown in an empty state, enabling the powdery material to maintain a dispersed suspended state. Then, it sequentially passes through the supercritical fluid to fully contact the material in a limited space, significantly improving the extraction rate of the effective substance. And through the self-characteristics of the empty-throwing and material-receiving film and the auxiliary driving effect of the auxiliary driving hanging part, on the one hand, it improves the dispersion effect of the material, and at the same time can turn over and change the posture to contact the supercritical fluid for full extraction of the material, and it is not easy to have extraction dead angles. On the other hand, it can also prevent the static adhesion of the powdery material from affecting the extraction effect. The present invention can greatly improve the single-pass extraction rate of the material and significantly improve the extraction efficiency.

[0021] (2) The lower end of the empty-throw feeding film is fixedly connected with a magnetic lifting and sealing hemisphere that matches the upflow channel. The magnetic lifting and sealing hemisphere is hemispherical and has an interference fit with the upflow channel. The structural characteristics of the magnetic lifting and sealing hemisphere can facilitate the sealing of the upper opening of the upflow channel, avoiding the supercritical fluid from flowing through the gap when the material is not suspended and directly passing through the material collecting cylinder, resulting in a decrease in the extraction rate.

[0022] (3) The magnetic lifting and sealing hemisphere includes a bottom base made of elastic soft material. The upper end of the bottom base is fixedly connected with a sealing ring part that is bonded to the empty-throw feeding film. The sealing ring part is made of heat-expandable rubber material. On the one hand, the bottom base can undergo slight deformation to better adapt to the upper opening of the upflow channel for sealing. On the other hand, it is not prone to impact damage when reset, and at the same time, it can also reduce the noise caused by impact. The sealing ring part expands after being heated according to the temperature characteristics of the supercritical fluid to better seal the upper opening of the upflow channel and improve the sealing effect.

[0023] (4) An annular auxiliary expansion cavity filled with carbon dioxide is provided inside the sealing ring part. A plurality of uniformly distributed heat-conducting and shape-fixing rods are inlaid and inserted inside the bottom base. A heat-conducting silica gel layer is filled between the bottom base and the sealing ring part, and the upper ends of the plurality of heat-conducting and shape-fixing rods all extend into the heat-conducting silica gel layer. The expansion coefficient of carbon dioxide when heated is larger than that of air, which can assist the edge of the sealing ring part to expand and improve the sealing error tolerance. In addition, even if leakage occurs, due to the same reason as the extraction medium, the interference is small. The heat-conducting and shape-fixing rods, on the one hand, act as a skeleton to shape the bottom base, and on the other hand, play a role in quickly conducting heat.

[0024] (5) A fixed magnet is inlaid inside the sealing ring part. An electromagnet installed on the material collecting cylinder is provided directly above the fixed magnet. The electromagnets are connected in series with each other and electrically connected to a power supply. The power supply is signal-connected to a timer. The deformation of the empty-throw feeding film can be forced by the supercritical fluid through the magnetic adsorption effect of the electromagnet on the fixed magnet to empty-throw the material. The function of the timer can be set by the technician according to the flow rate of the fluid, and then the dynamic extraction of the material can be realized regularly.

[0025] (6) A first filter screen is installed at the opening of the material collecting cylinder through a buckle, and the electromagnet is installed at the center of the first filter screen. A second filter screen is installed inside the flow-receiving side pipe. The first filter screen is to prevent the supercritical fluid from carrying out powdery materials, ensuring that the supercritical fluid coming out of the extraction kettle is clean and avoiding the supercritical fluid carrying material dust to pollute the subsequent pipelines, equipment and products. The second filter screen is used to prevent the materials falling after empty-throwing from flowing out from the flow-receiving side pipe.

[0026] (7) A plurality of staggered auxiliary driving hanging members are fixedly connected to the inner side wall of the aggregating cylinder. The auxiliary driving hanging members include high-vibration elastic rods fixedly connected to the inner side wall of the aggregating cylinder. One end of the high-vibration elastic rod away from the inner side wall of the aggregating cylinder is fixedly connected with a magnetic auxiliary driving sheet. A plurality of fiber bandages are adhesively bonded to the surface of the magnetic auxiliary driving sheet. The auxiliary driving hanging members play an auxiliary driving effect. On the one hand, it can extend the suspension time of the material, enabling it to come into contact with the supercritical fluid more fully for extraction. On the other hand, it can cause the material to turn over, improving the comprehensiveness of extraction. It can also cause dynamic resonance of the supercritical fluid, increasing its dissolution rate.

[0027] (8) The empty-throwing and material-receiving film sequentially includes a bottom film, a fiber interlayer, and a top film from outside to inside. A plurality of uniformly distributed heat-expandable balls are filled in the fiber interlayer. The empty-throwing and material-receiving film has a very high deformation strength and is not easily damaged such as torn. The heat-expandable balls use the characteristic of heat expansion to force the top film to have local multi-point convexities. On the one hand, it can promote the turning of the material. On the other hand, it can reduce the adhesion of the material to the top film, improving the empty-throwing effect of the empty-throwing and material-receiving film.

[0028] (9) A plurality of uniformly distributed metal patches are fixedly connected to the outer surface of the bottom film. A reset elastic wire is fixedly connected between the metal patch and the inner side wall of the hemispherical material trough. The reset elastic wire plays a role in assisting the reset of the empty-throwing and material-receiving film, and at the same time plays a role in shaping the empty-throwing and material-receiving film, avoiding the problem of permanent deformation caused by long-term deformation. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of the present invention;

[0030] Figure 2 is a schematic structural diagram of the multi-layer material cylinder of the present invention;

[0031] Figure 3 is Figure 2 a schematic structural diagram of part A in

[0032] Figure 4 is a schematic structural diagram of the magnetic lifting and sealing hemisphere of the present invention;

[0033] Figure 5 is a schematic structural diagram of the auxiliary driving hanging member of the present invention;

[0034] Figure 6 is a schematic structural diagram of the empty-throwing and material-receiving film of the present invention;

[0035] Figure 7 is a schematic structural diagram of the material of the present invention in a suspended state.

[0036] Explanation of the reference numerals in the drawings:

[0037] 1. Carbon dioxide cylinder, 2. Purifier, 3. Condenser, 4. Main pump, 5. Mixer, 6. Heater, 7. Extraction kettle, 8. Multi-layer material cylinder, 9. Separator, 10. Liquefied gas tank, 11. Distribution plate, 12. Upflow channel, 13. Hemispherical material tank, 14. Empty throwing and receiving material film, 141. Bottom film, 142. Fiber interlayer, 143. Top film, 15. Material collecting cylinder, 16. Connecting flow side pipe, 17. First filter screen, 18. Electromagnet, 19. Second filter screen, 20. Magnetic lifting and sealing hemisphere, 201. Bottom base part, 202. Sealing ring part, 21. Auxiliary driving hanging part, 211. High vibration elastic rod, 212. Magnetic auxiliary driving piece, 213. Fiber bundle belt, 22. Heat-conducting shaping rod, 23. Annular auxiliary expansion cavity, 24. Fixed magnet, 25. Heat-conducting silica gel layer, 26. Heat-expanded ball, 27. Metal patch, 28. Reset elastic wire, 29. Compressor. Detailed implementation mode

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, 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 should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] Embodiment 1:

[0042] Please refer to Figure 1, a suspended point contact type supercritical extraction device, including a carbon dioxide cylinder 1, a purifier 2, a condenser 3, a main pump 4, a mixer 5, a heater 6, an extraction kettle 7 and a separator 9 connected in sequence. The separator 9 is also connected to a liquefied gas tank 10, the liquefied gas tank 10 is connected to a compressor 29, and the compressor 29 is connected to the carbon dioxide cylinder 1. Please refer to Figure 2 , a multi-layer material cylinder 8 is installed in the extraction kettle 7, and a plurality of uniformly distributed distribution plates 11 are fixedly installed in the multi-layer material cylinder 8.

[0043] Please refer to Figure 3 , a plurality of uniformly distributed hemispherical material grooves 13 are opened at the upper end of the distribution plate 11. An upflow channel 12 penetrating the distribution plate 11 is opened on the bottom wall of the hemispherical material groove 13 to provide a flow channel for the supercritical fluid to pass through. A matching empty throwing and receiving material film 14 is attached in the hemispherical material groove 13, and the edge of the empty throwing and receiving material film 14 is fixedly connected to the opening of the hemispherical material groove 13. The empty throwing and receiving material film 14 is used to hold the material to be extracted. A material collecting cylinder 15 fixedly connected to the upper end of the distribution plate 11 is provided above the hemispherical material groove 13 to concentrate the empty-thrown material in the material collecting cylinder 15 to prevent loss and scattering. A plurality of annularly arrayed communication holes are opened on the inner side wall of the hemispherical material groove 13, and a connecting flow side pipe 16 is fixedly connected between the communication holes and the material collecting cylinder 15.

[0044] The lower end of the empty throwing and receiving material film 14 is fixedly connected to a magnetic lifting and sealing hemisphere 20 matching the upflow channel 12. The magnetic lifting and sealing hemisphere 20 is hemispherical and has an interference fit with the upflow channel 12. The structural characteristics of the magnetic lifting and sealing hemisphere 20 can facilitate the sealing of the upper opening of the upflow channel 12, avoiding the supercritical fluid from flowing through the gap in the state where the material is not suspended and directly passing through the material collecting cylinder 15, resulting in a decrease in the extraction rate.

[0045] Please refer to Figure 4, the magnetic lift seal hemisphere 20 includes a bottom base 201 made of elastic soft material. A seal ring portion 202 adhesively connected to the empty throwing and receiving film 14 is fixedly connected to the upper end of the bottom base 201. The seal ring portion 202 is made of a thermally expandable rubber material. On the one hand, the bottom base 201 can undergo slight deformation to better adapt to the upper opening of the upflow channel 12 for sealing. On the other hand, it is not prone to impact damage during its reset, and at the same time, it can also reduce the noise caused by the impact. The seal ring portion 202 expands after being heated according to the temperature characteristics of the supercritical fluid to better seal the upper opening of the upflow channel 12 and improve the sealing effect. An annular auxiliary expansion cavity 23 filled with carbon dioxide is provided in the seal ring portion 202. A plurality of uniformly distributed heat-conducting and shape-fixing rods 22 are inlaid and inserted in the bottom base 201. A heat-conducting silica gel layer 25 is filled between the bottom base 201 and the seal ring portion 202, and the upper ends of the plurality of heat-conducting and shape-fixing rods 22 all extend into the heat-conducting silica gel layer 25. The expansion coefficient of carbon dioxide when heated is larger than that of air, which can assist the edge of the seal ring portion 202 to expand and improve the sealing error tolerance. In addition, even if leakage occurs, due to the same reason as the extraction medium, the interference is small. The heat-conducting and shape-fixing rods 22, on the one hand, act as a skeleton to shape the bottom base 201, and on the other hand, play a role in quickly conducting heat. A fixed magnet 24 is inlaid in the seal ring portion 202. An electromagnet 18 installed on the material collecting cylinder 15 is provided directly above the fixed magnet 24. The electromagnets 18 are connected in series with each other and electrically connected to a power supply. The power supply is signal-connected to a timer. The deformation of the empty throwing and receiving film 14 can be assisted by the magnetic adsorption force of the electromagnet 18 on the fixed magnet 24 to throw the material empty. The function of the timer can be set by the technician according to the flow rate of the fluid, and then the dynamic extraction of the material can be realized regularly.

[0046] Please continue to refer to Figure 3 , a first filter screen 17 is installed at the opening of the material collecting cylinder 15 through a buckle, and the electromagnet 18 is installed at the center of the first filter screen 17. A second filter screen 19 is installed in the flow receiving side pipe 16. The first filter screen 17 is to prevent the supercritical fluid from carrying out powdery materials, ensure the cleanliness of the supercritical fluid coming out of the extraction kettle 7, and avoid the supercritical fluid carrying material dust to pollute the subsequent pipelines, equipment and products. The second filter screen 19 is used to prevent the materials falling after empty throwing from flowing out from the flow receiving side pipe 16. A plurality of staggeredly distributed auxiliary moving hanging parts 21 are fixedly connected to the inner side wall of the material collecting cylinder 15.

[0047] Please refer to Figure 6, the auxiliary driving hanging part 21 includes a high-vibration elastic rod 211 fixedly connected to the inner side wall of the material gathering cylinder 15. One end of the high-vibration elastic rod 211 away from the inner side wall of the material gathering cylinder 15 is fixedly connected with a magnetic auxiliary driving sheet 212. A plurality of fiber bands 213 are adhesively bonded to the surface of the magnetic auxiliary driving sheet 212. The auxiliary driving hanging part 21 plays an auxiliary driving effect. On the one hand, it can extend the suspension time of the material, enabling it to come into contact with the supercritical fluid more fully for extraction. On the other hand, it can cause the material to turn over, improving the comprehensiveness of extraction. It can also cause dynamic resonance of the supercritical fluid, increasing its dissolution rate.

[0048] Please refer to Figure 7 , the empty-throwing and material-receiving film 14 sequentially includes a bottom film 141, a fiber interlayer 142, and a top film 143 from outside to inside, and they are adhesively bonded together. The bottom film 141 and the top film 143 can be made of plastic or rubber materials. A plurality of uniformly distributed heat-expandable balls 26 are filled in the fiber interlayer 142. The heat-expandable balls 26 are made of a rubber material with a relatively high coefficient of thermal expansion. The empty-throwing and material-receiving film 14 has a high deformation strength and is not easily damaged such as torn. The heat-expandable balls 26 use the characteristic of thermal expansion to force the top film 143 to have local multi-point protrusions. On the one hand, it can cause the material to turn over. On the other hand, it can reduce the adhesion of the material on the top film 143, improving the empty-throwing effect of the empty-throwing and material-receiving film 14. A plurality of uniformly distributed metal patches 27 are fixedly connected to the outer surface of the bottom film 141. A reset elastic wire 28 is fixedly connected between the metal patches 27 and the inner side wall of the hemispherical material trough 13. The reset elastic wire 28 plays a role in assisting the empty-throwing and material-receiving film 14 to reset, and at the same time plays a role in shaping the empty-throwing and material-receiving film 14, avoiding the problem of permanent deformation caused by long-term deformation.

[0049] During use, the carbon dioxide in the carbon dioxide cylinder 1 enters the extraction kettle 7 after being pressurized and heated to the supercritical state. When passing through the multi-layer material cylinder 8, it rises through the upflow channels 12 on the distribution plate 11. When passing through the hemispherical material trough 13, it is blocked by the magnetic lifting and sealing hemisphere 20. The heated carbon dioxide fluid starts to heat the magnetic lifting and sealing hemisphere 20. After the heat is transferred to the empty-throwing and material-receiving film 14, due to the thermal expansion characteristic of the heat-expandable balls 26, it will drive the local multi-point deformation of the top film 143, avoiding material adhesion. As the accumulated pressure of the carbon dioxide gradually rises to push open the magnetic lifting and sealing hemisphere 20, and it causes the empty-throwing and material-receiving film 14 to deform upward to empty and disperse the upper material into the material gathering cylinder 15 and suspend it. Please refer to Figure 7, as the empty throwing and receiving film 14 deforms, the communication holes are exposed for carbon dioxide to pass through and enter the material collecting cylinder 15 via the flow receiving side pipe 16, and make full contact and extraction with the suspended materials in the material collecting cylinder 15. It should be noted that in order to ensure that the magnetic lifting sealing hemisphere 20 can be smoothly pushed open, the electromagnet 18 is energized regularly. The magnetic adsorption force is used to force the magnetic lifting sealing hemisphere 20 to rise. At the same time, the auxiliary moving hanging part 21 will also rotate upward under the magnetic force. After the electromagnet 18 is energized, it is immediately de-energized. The empty throwing and receiving film 14 resets under the elastic force of the reset elastic wire 28 and the gravity of the magnetic lifting sealing hemisphere 20 to re-seal the upward flow channel 12, ensuring that the carbon dioxide passed through during the previous period can fully perform material extraction. After the magnetic force disappears, the auxiliary moving hanging part 21 will have a high-frequency vibration phenomenon due to the elastic force of the high-vibration elastic rod 211. On the one hand, it causes the resonance of the carbon dioxide fluid, and on the other hand, it prolongs the suspended time of the materials, assisting the carbon dioxide fluid to fully extract the materials. After extraction for a certain time, the materials fall onto the empty throwing and receiving film 14 for the next empty throw. After this empty throw, the carbon dioxide fluid entering will push open the carbon dioxide containing the extracted substances after the just extraction and leave the extraction kettle 7 and enter the separator 9, and then a new round of extraction can be carried out, ensuring the high extraction performance of the carbon dioxide fluid.

[0050] The present invention can achieve the abandonment of the static extraction method of the hanging basket in the traditional extraction kettle. By using the deformation characteristics of the empty throwing and receiving film 14, the materials placed are shaken and thrown in the air, prompting the powdery materials to maintain a dispersed suspended state, and then sequentially passing through the supercritical fluid to make full contact with the materials in a limited space, significantly improving the extraction rate of effective substances. And through the self-characteristics of the empty throwing and receiving film 14 and the auxiliary driving effect of the auxiliary moving hanging part 21, on the one hand, the dispersion effect of the materials is improved, and at the same time, the materials can be turned over and changed in posture to contact with the supercritical fluid, fully extracting the materials and not easily appearing extraction dead corners. On the other hand, it can also avoid the static adhesion phenomenon of powdery materials affecting the extraction effect. The present invention can greatly improve the single-pass extraction rate of materials and significantly improve the extraction efficiency.

[0051] The above is only the preferred specific implementation manner of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A suspended point contact type supercritical extraction device, comprising a carbon dioxide cylinder (1), a purifier (2), a condenser (3), a main pump (4), a mixer (5), a heater (6), an extraction kettle (7) and a separator (9) which are connected in sequence, and is characterized in that: The separator (9) is also connected to a liquefied gas tank (10), the liquefied gas tank (10) is connected to a compressor (29), and the compressor (29) is connected to a carbon dioxide cylinder (1). A multi-layer material cylinder (8) is installed in the extraction kettle (7), and a plurality of uniformly distributed distribution plates (11) are fixedly installed in the multi-layer material cylinder (8). A plurality of uniformly distributed hemispherical material grooves (13) are formed in the upper end of the distribution plate (11). An upflow channel (12) penetrating the distribution plate (11) is formed in the bottom wall of the hemispherical material groove (13). A matching empty throwing and receiving material film (14) is attached in the hemispherical material groove (13), and the edge of the empty throwing and receiving material film (14) is fixedly connected to the opening of the hemispherical material groove (13). A material collecting cylinder (15) fixedly connected to the upper end of the distribution plate (11) is arranged above the hemispherical material groove (13). A plurality of annularly arrayed communication holes are formed in the inner side wall of the hemispherical material groove (13), and a connecting flow side pipe (16) is fixedly connected between the communication holes and the material collecting cylinder (15); A magnetic lifting and sealing hemisphere (20) matching the upflow channel (12) is fixedly connected to the lower end of the empty throwing and receiving material film (14), and the magnetic lifting and sealing hemisphere (20) is hemispherical and has an interference fit with the upflow channel (12); The magnetic lifting and sealing hemisphere (20) includes a bottom base part (201) made of an elastic soft material. A sealing ring part (202) adhesively connected to the empty throwing and receiving material film (14) is fixedly connected to the upper end of the bottom base part (201), and the sealing ring part (202) is made of a thermally expandable rubber material; An annular inflation assisting cavity (23) filled with carbon dioxide is formed in the sealing ring part (202). A plurality of uniformly distributed heat-conducting shaping rods (22) are inlaid and inserted in the bottom base part (201). A heat-conducting silica gel layer (25) is filled between the bottom base part (201) and the sealing ring part (202), and the upper ends of the plurality of heat-conducting shaping rods (22) all extend into the heat-conducting silica gel layer (25); A fixed magnet (24) is inlaid in the sealing ring part (202). An electromagnet (18) installed on the material collecting cylinder (15) is arranged directly above the fixed magnet (24). The electromagnets (18) are connected in series with each other and electrically connected to a power supply, and the power supply is signal-connected to a timer; A first filter screen (17) is installed at the opening of the material collecting cylinder (15) through a buckle, and the electromagnet (18) is installed at the center of the first filter screen (17). A second filter screen (19) is installed in the connecting flow side pipe (16); A plurality of staggered assisting hanging parts (21) are fixedly connected to the inner side wall of the material collecting cylinder (15). The assisting hanging part (21) includes a high-vibration elastic rod (211) fixedly connected to the inner side wall of the material collecting cylinder (15). A magnetic assisting piece (212) is fixedly connected to one end of the high-vibration elastic rod (211) far away from the inner side wall of the material collecting cylinder (15). A plurality of fiber bundles (213) are adhesively connected to the surface of the magnetic assisting piece (212);The empty throw and receiving film (14) sequentially includes a bottom film (141), a fiber interlayer (142) and a top film (143) from outside to inside, and a plurality of uniformly distributed heat-expanded balls (26) are filled in the fiber interlayer (142); the heat-expanded balls (26) are made of rubber material.; 2. The suspended point-contact type supercritical extraction device according to claim 1, characterized in that: A plurality of uniformly distributed metal patches (27) are fixedly connected to the outer surface of the bottom film (141), and a reset elastic wire (28) is fixedly connected between the metal patch (27) and the inner side wall of the hemispherical material tank (13).

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