Laboratory supercritical extraction kettle device

Abstract

The utility model relates to a laboratory supercritical extraction kettle device, which comprises: a carbon dioxide container assembly comprising a pressure container, a bottle valve structure and a conduit, the first end of the conduit being located inside the pressure container, the second end of the conduit being located outside the pressure container; the compression assembly comprises a heat preservation shell, compression equipment, a first pipeline and a refrigeration structure. The water bath assembly comprises a water bath structure and a second pipeline, the first end of the second pipeline communicates with an outlet of the compression equipment, and at least part of the second pipeline is arranged in the water bath structure; the extraction kettle assembly comprises an extraction kettle, a third pipeline, a fourth pipeline and a valve, the first end of the third pipeline is communicated with the second end of the second pipeline, the second end of the third pipeline is communicated with an inlet of the extraction kettle, the first end of the fourth pipeline is communicated with an outlet of the extraction kettle, and the valve is arranged on the fourth pipeline. According to the technical scheme, the problems that in the prior art, a supercritical extraction kettle device in a laboratory is large in size, large in occupied area and high in cost are solved.

Description

Technical Field

[0001] This application relates to the technical field of laboratory extraction apparatus, and more specifically, to a laboratory supercritical extraction apparatus. Background Art

[0002] Supercritical fluids are fluids that exist above their critical temperature and critical pressure, falling between the levels of gas and liquid. They possess the dual properties of both liquids and gases, with a density similar to liquids, readily dissolving components, and a viscosity similar to gases, facilitating diffusion. Supercritical fluid extraction is a technique that uses supercritical fluids as solvents to extract and separate certain effective components from solid or liquid materials. Carbon dioxide is commonly used as a supercritical extractant due to its mild conditions, low cost, and non-toxic, pollution-free nature.

[0003] Laboratory supercritical fluid extraction (SCFE) apparatuses are commonly used in chemistry, chemical engineering, and pharmaceutical fields. Taking the pharmaceutical industry as an example, SCFE apparatuses can extract active ingredients from natural products or for the preparation and purification of drugs. Existing laboratory SCFE apparatuses include refrigeration systems, extraction vessels, compressors, and other equipment; these apparatuses are relatively large, require a large floor space, and are costly. Utility Model Content

[0004] This application provides a laboratory supercritical extraction vessel device to solve the problems of large size, large area occupation, and high cost of existing laboratory supercritical extraction vessels.

[0005] A laboratory supercritical extraction apparatus according to this application includes: a carbon dioxide container assembly, which includes a pressure vessel, a bottle head valve structure, and a conduit. The bottle head valve structure is sealed at the container opening of the pressure vessel, and the conduit sealably passes through the bottle head valve structure. The first end of the conduit is located inside the pressure vessel and at a predetermined distance from the bottom wall of the pressure vessel, and the second end of the conduit is located outside the pressure vessel; a compression assembly, which includes an insulation shell, a compression device, a first pipeline, and a refrigeration structure. Both the compression device and the refrigeration structure are located inside the insulation shell, and the inlet of the compression device is connected to the second end of the conduit through the first pipeline; a water bath assembly, which includes a water bath structure and a second pipeline. The first end of the second pipeline is connected to the outlet of the compression device, and the second pipeline is at least partially located inside the water bath structure; and an extraction vessel assembly, which includes an extraction vessel, a third pipeline, a fourth pipeline, and a valve. The first end of the third pipeline is connected to the second end of the second pipeline, and the second end of the third pipeline is connected to the inlet of the extraction vessel. The first end of the fourth pipeline is connected to the outlet of the extraction vessel, and the valve is located on the fourth pipeline.

[0006] Furthermore, the extraction vessel assembly also includes a heating structure, which is disposed on the outer wall of the extraction vessel.

[0007] Furthermore, the heating structure includes a heating resistance wire wound around the outer wall of the extraction vessel.

[0008] Furthermore, the extraction vessel assembly also includes a filter screen plate, which is disposed inside the extraction vessel and located at the outlet end of the extraction vessel.

[0009] Furthermore, the extraction vessel includes a support step located at the outlet of the extraction vessel and extending inward, with the edge of the filter screen plate resting on the support step.

[0010] Furthermore, the filter screen plate includes a screen plate body and a plurality of screen holes disposed on the screen plate body. The distance between adjacent screen holes at the edge of the screen plate body is less than the distance between adjacent screen holes near the center of the screen plate body.

[0011] Furthermore, the extraction vessel includes an inlet connecting section, an extraction vessel body, and an extraction vessel outlet section. The inlet connecting section is connected to the first end of the extraction vessel body, and the extraction vessel outlet section is connected to the second end of the extraction vessel body. The inner wall of the inlet connecting section has internal threads, and the inner wall diameter of the inlet connecting section is larger than the inner wall diameter of the extraction vessel body, so that a sealing step is formed on a portion of the end face of the first end of the extraction vessel body.

[0012] Furthermore, the extraction vessel body includes an inlet connecting section, an extraction vessel body, and an extraction vessel outlet section. The inlet connecting section and the extraction vessel outlet section are respectively connected to both ends of the extraction vessel body. The inner wall of the extraction vessel body has multiple channel grooves that run along the axis. The connection between the extraction vessel outlet section and the extraction vessel body has a support groove. The filter sieve plate includes a sieve plate body, multiple sieve holes, and multiple support protrusions. The multiple sieve holes are arranged on the sieve plate body, and the multiple support protrusions are located on the circumferential outer side of the sieve plate body. The multiple support protrusions are adapted to the multiple channel grooves.

[0013] Furthermore, the laboratory supercritical extraction vessel also includes a heat insulation layer, with heat insulation layers provided on the outer circumference of the first, second, third, and fourth pipelines.

[0014] Furthermore, the laboratory supercritical extraction vessel also includes an entrainer assembly, which includes an entrainer delivery pump, a fifth pipeline, and a three-way valve. The outlet of the entrainer delivery pump is connected to the inlet of the fifth pipeline, and the outlet of the fifth pipeline is connected to the third pipeline through the three-way valve.

[0015] The technical solution of this application involves conveying gaseous carbon dioxide from a pressure vessel to a compression assembly via a conduit. The compression assembly compresses and cools the gaseous carbon dioxide, converting it into liquid carbon dioxide upon reaching critical pressure. The liquid carbon dioxide is then conveyed to a water bath assembly, which maintains a predetermined temperature, causing the liquid carbon dioxide to transform into supercritical carbon dioxide. This supercritical carbon dioxide is then conveyed to an extraction vessel assembly. Gas replacement, gaseous carbon dioxide discharge, and carbon dioxide flow control are achieved through valve control. The laboratory supercritical extraction vessel device of this application eliminates the need for an independent refrigeration system and air compressor, significantly reducing the size and cost of the device. This technical solution effectively solves the problems of large size, large footprint, and high cost of existing laboratory supercritical extraction vessel devices. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram of the process flow of the laboratory supercritical extraction vessel apparatus according to Embodiment 1 of this application is shown;

[0019] Figure 2 Shown Figure 1 A schematic diagram of the extraction vessel assembly of a laboratory supercritical extraction vessel device;

[0020] Figure 3 Shown Figure 2 A schematic diagram of the structure of the filter screen plate of the extraction vessel assembly;

[0021] Figure 4 Shown Figure 1 A schematic diagram of the connection structure between the piping and the insulation layer of the laboratory supercritical extraction vessel;

[0022] Figure 5 A schematic diagram of the extraction vessel assembly of the laboratory supercritical extraction vessel apparatus according to Embodiment 2 of this application is shown;

[0023] Figure 6 Shown Figure 5 A schematic diagram of the structure of the filter screen plate of the extraction vessel assembly;

[0024] Figure 7 A schematic diagram of the process flow of the laboratory supercritical extraction vessel apparatus of Embodiment 3 of this application is shown.

[0025] The above figures include the following reference numerals:

[0026] 10. Carbon dioxide container assembly; 11. Pressure vessel; 12. Bottle head valve structure; 13. Conduit; 20. Compression assembly; 21. Insulated shell; 22. Compression equipment; 23. First pipeline; 24. Refrigeration structure; 30. Water bath assembly; 31. Water bath structure; 32. Second pipeline; 40. Extraction vessel assembly; 41. Extraction vessel; 411. Inlet connection section; 412. Extraction vessel body; 413. Extraction vessel outlet section; 42. Third pipeline; 43. Fourth pipeline; 44. Valve; 45. Heating structure; 46. Filter screen plate; 50. Insulation layer; 60. Entrainer assembly; 61. Entrainer delivery pump; 62. Fifth pipeline; 63. Three-way valve. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0029] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] like Figures 1 to 4As shown, the laboratory supercritical extraction apparatus of Embodiment 1 includes: a carbon dioxide container assembly 10, a compression assembly 20, a water bath assembly 30, and an extraction vessel assembly 40. The carbon dioxide container assembly 10 includes a pressure vessel 11, a bottle-head valve structure 12, and a conduit 13. The bottle-head valve structure 12 is sealed at the opening of the pressure vessel 11. The conduit 13 seals through the bottle-head valve structure 12. The first end of the conduit 13 is located inside the pressure vessel 11 and at a predetermined distance from the bottom wall of the pressure vessel 11. The second end of the conduit 13 is located outside the pressure vessel 11. The compression assembly 20 includes an insulated shell 21, a compression device 22, a first pipeline 23, and a cooling structure 24. Both the compression device 22 and the cooling structure 24 are disposed within the insulated shell 21. The inlet of the compression device 22 is connected to the second end of the conduit 13 via the first pipeline 23. The water bath assembly 30 includes a water bath structure 31 and a second pipeline 32. The first end of the second pipeline 32 is connected to the outlet of the compression device 22. The second pipeline 32 is at least partially disposed within the water bath structure 31. The extraction vessel assembly 40 includes an extraction vessel 41, a third pipeline 42, a fourth pipeline 43, and a valve 44. The first end of the third pipeline 42 is connected to the second end of the second pipeline 32, and the second end of the third pipeline 42 is connected to the inlet of the extraction vessel 41. The first end of the fourth pipeline 43 is connected to the outlet of the extraction vessel 41, and the valve 44 is installed on the fourth pipeline 43.

[0031] Applying the technical solution of this embodiment, gaseous carbon dioxide in pressure vessel 11 is transported to compression assembly 20 via conduit 13. Compression assembly 20 compresses and cools the gaseous carbon dioxide, converting it into liquid carbon dioxide upon reaching critical pressure. The liquid carbon dioxide is then transported to water bath assembly 30, which maintains a predetermined temperature, causing the liquid carbon dioxide to transform into supercritical carbon dioxide. The supercritical carbon dioxide is then transported to extraction vessel assembly 40. Gas replacement, gaseous carbon dioxide discharge, and carbon dioxide flow control are achieved through control valve 44. The laboratory supercritical extraction vessel device of this embodiment does not require an independent refrigeration system or air compressor, significantly reducing the size and cost of the device. The technical solution of this embodiment effectively solves the problems of large size, large footprint, and high cost of existing laboratory supercritical extraction vessel devices.

[0032] It should be noted that the pressure vessel 11 (cylinder) contains liquid carbon dioxide. If the cylinder valve (valve of the cylinder head valve structure 12) is opened directly, gas will flow out. In this embodiment, the compression device 22 is a plunger pump. Plunger pumps are small in size and low in cost, and can bring the pressure of liquid carbon dioxide to its critical value of 7.4 MPa. At the same time, a refrigeration structure 24 is provided inside the insulation shell 21. The refrigeration structure is a semiconductor refrigeration because semiconductor refrigeration not only meets the refrigeration requirements, but also has the advantages of small size and no interference. The refrigeration by the refrigeration structure 24 allows the carbon dioxide to reach the critical pressure, and then it enters the water bath (water bath structure 31). The predetermined temperature of the water bath in this embodiment is set at about 40 degrees Celsius. This is determined by the physicochemical properties of carbon dioxide. The critical temperature of carbon dioxide is 31.2 degrees Celsius. Considering heat loss, the temperature of carbon dioxide will not be lower than the critical temperature. In this way, the carbon dioxide reaches both the critical pressure and the critical temperature. The carbon dioxide at the critical pressure and critical temperature then enters the extraction vessel 41. The outer wall of the extraction vessel 41 is provided with a heating structure 45, which keeps the carbon dioxide under critical conditions. This temperature is also set at about 40 degrees Celsius. The extraction vessel 41 is kept at a constant temperature for 2-3 hours. This ensures that the supercritical carbon dioxide and the raw materials are in full contact and reach mass transfer equilibrium. Then, the pressure and temperature can be released to collect the extract.

[0033] In the technical solution of this embodiment, the cooling structure 24 can be as follows: Figure 1 As shown, the refrigeration structure 24 is attached to the wall of the insulation shell 21 to maintain the temperature inside the entire insulation shell 21 at a predetermined temperature. Alternatively, the refrigeration structure 24 can be attached to the outer wall of the compression device 22. The integration of the refrigeration structure 24 onto the insulation shell 21 or the compression device 22 makes the structure of this embodiment compact and occupies a small area.

[0034] like Figure 2 As shown, in the technical solution of Embodiment 1, the extraction vessel assembly 40 further includes a heating structure 45, which is disposed on the outer wall of the extraction vessel 41. The heating structure 45 on the outer wall of the extraction vessel 41 ensures that the carbon dioxide remains under critical conditions, which is approximately 40°C. It should be noted that the extraction vessel assembly 40 also includes a thermal insulation layer, disposed outside the heating structure 45. This layer serves two purposes: firstly, it provides thermal insulation for the extraction vessel 41; secondly, it facilitates operation of the extraction vessel 41 by the operator and protects the operator from injury.

[0035] like Figure 2As shown, in the technical solution of Embodiment 1, the heating structure 45 includes a heating resistance wire wound around the outer wall of the extraction vessel 41. The heating structure 45 is installed on the outer wall of the extraction vessel 41, ensuring that carbon dioxide remains under critical conditions, approximately 40°C. This structure is cost-effective, compact, and convenient for laboratory use. It should be noted that the extraction vessel assembly also includes an extraction vessel temperature sensor, which is positioned between the thermal insulation layer and the extraction vessel 41. The temperature of the extraction vessel is monitored in real time. The laboratory supercritical extraction vessel device also includes a control component. The extraction vessel temperature sensor and the heating structure 45 are electrically connected. The power of the heating structure 45 is adjusted based on the feedback temperature from the extraction vessel temperature sensor. For example, when the extraction vessel temperature sensor measures 36°C, the power of the heating structure 45 increases; when the extraction vessel temperature sensor measures 42°C, the power of the heating structure 45 decreases.

[0036] like Figure 2 and Figure 3 As shown, in the technical solution of Embodiment 1, the extraction vessel assembly 40 further includes a filter screen plate 46, which is disposed inside the extraction vessel 41 and located at the outlet end of the extraction vessel 41. The filter screen plate 46 ensures higher purity of the extract on the one hand, and makes the pipelines and valves 44 less prone to clogging on the other hand.

[0037] like Figure 2 and Figure 3 As shown, in the technical solution of Embodiment 1, the extraction vessel 41 includes a supporting step, which is located at the outlet of the extraction vessel body and extends inward. The edge of the filter screen plate 46 rests on the supporting step. The above structure is compact and facilitates the placement of the filter screen plate 46.

[0038] like Figure 3 As shown, in the technical solution of Embodiment 1, the filter sieve plate 46 includes a sieve plate body and multiple sieve holes disposed on the sieve plate body. The distance between adjacent sieve holes at the edge of the sieve plate body is smaller than the distance between adjacent sieve holes near the center of the sieve plate body. This makes the extraction efficiency of the extract more thorough. Through fluid dynamics simulation, the fluid resistance loss near the center of the sieve plate body is minimal, and the fluid passes through easily, while the edge of the sieve plate body is prone to forming stagnation areas. The filter sieve plate 46 with the above structure greatly reduces the stagnation areas, so that the fluid in each area can be collected. It should be noted that the second end of the fourth pipe 43 is connected to a test tube (a beaker or other container can also be used). The extract remains in the test tube, and the carbon dioxide overflowing from the test tube is collected or directly discharged.

[0039] like Figure 2As shown, in the technical solution of Embodiment 1, the extraction vessel 41 includes an inlet connecting section 411, an extraction vessel body 412, and an extraction vessel outlet section 413. The inlet connecting section 411 is connected to the first end of the extraction vessel body 412, and the extraction vessel outlet section 413 is connected to the second end of the extraction vessel body 412. The inner wall of the inlet connecting section 411 has internal threads, and the inner diameter of the inlet connecting section 411 is larger than the inner diameter of the extraction vessel body 412, so that a sealing step is formed on a portion of the end face of the first end of the extraction vessel body 412. The extraction vessel 41 achieves connection and sealing functions through its own structural design. The second end of the third pipeline 42 has external threads, and the end of the third pipeline 42 has a sealing end face that seals against the sealing step. Sealing is achieved through the sealing surface abutting and the threads. It should be noted that, to ensure the purity of the extract, the above-mentioned seal should not use sealing components such as silicone.

[0040] like Figure 4 As shown, in the technical solution of Embodiment 1, the laboratory supercritical extraction vessel also includes a heat insulation layer 50. The first pipe 23, the second pipe 32, the third pipe 42, and the fourth pipe 43 are all provided with heat insulation layers 50 on their outer circumferential sides. The heat insulation layers 50 on the pipes (first pipe 23, second pipe 32, third pipe 42, and fourth pipe 43) can reduce heat exchange between the laboratory supercritical extraction vessel and the outside environment, thus improving the temperature controllability of the laboratory supercritical extraction vessel.

[0041] like Figure 1 As shown, in the technical solution of Embodiment 1, the cooling structure 24 is a semiconductor cooling structure. The above structure is compact, occupies a small area, and is suitable for laboratory use. It should be noted that the compression assembly 20 also includes a fan, which is mounted on the insulation housing 21 to dissipate the heat generated by the compression assembly 20.

[0042] The inner diameter of the extraction vessel body 412 in Example 1 is between 8 mm and 100 mm, which is more suitable for the extraction of natural product components in the laboratory.

[0043] like Figure 5 and Figure 6As shown, the difference between the technical solution of Embodiment 2 and Embodiment 1 is that the extraction vessel 41 includes an inlet connecting section 411, an extraction vessel body 412, and an extraction vessel outlet section 413. The inlet connecting section 411 and the extraction vessel outlet section 413 are respectively connected to both ends of the extraction vessel body 412. The inner wall of the extraction vessel body 412 has multiple channel grooves running along the axis. The connection between the extraction vessel outlet section 413 and the extraction vessel body 412 has a support groove. The filter sieve plate 46 includes a sieve plate body, multiple sieve holes, and multiple support protrusions. The multiple sieve holes are arranged on the sieve plate body, and the multiple support protrusions are located on the circumferential outer side of the sieve plate body. The multiple support protrusions are adapted to the multiple channel grooves. The filter sieve plate 46 slides into the support groove through the channel groove, and then the filter sieve plate 46 is rotated at a certain angle. In this way, even if the filter sieve plate 46 is inverted, the filter sieve plate 46 will not move along the axial direction of the extraction vessel 41. It should be noted that, as another implementation, there may be two filter screens 46, with the extractable material disposed between the two filter screens 46. The two filter screens 46 are spaced apart along the axial direction of the extraction vessel body 412. There are two support grooves, one of which is located at the connection between the extraction vessel body 412 and the extraction vessel outlet section 413, and the other is located near the inlet connection section 411 of the extraction vessel body 412.

[0044] like Figure 7 As shown, the technical solution of Embodiment 3 differs from that of Embodiment 1 in that the laboratory supercritical extraction vessel device further includes an entrainer assembly 60, which includes an entrainer delivery pump 61, a fifth pipeline 62, and a three-way valve 63. The outlet of the entrainer delivery pump 61 is connected to the inlet of the fifth pipeline 62, and the outlet of the fifth pipeline 62 is connected to the third pipeline 42 through the three-way valve 63.

[0045] By applying the technical solution of this embodiment, the inclusion of the entrainer component 60 improves the versatility of the laboratory supercritical extraction vessel. Without the entrainer component 60, supercritical carbon dioxide can only be used for the extraction of lipid-soluble components. In this embodiment, the addition of the entrainer component 60 allows the entrainer and supercritical carbon dioxide to mix, improving the solvent selectivity of carbon dioxide and increasing the extraction efficiency for polar components. A three-way valve 63 is added before the extraction vessel. If extracting lipid-soluble components, such as essential oils, the entrainer pipeline (fifth pipeline 62) is closed, allowing only supercritical carbon dioxide to enter the extraction vessel, resulting in a pure extract. If extracting polar components, such as flavonoids, the entrainer pipeline can be opened, allowing it to enter the extraction vessel 41 together with supercritical carbon dioxide. The mixture in the extraction vessel 41 forms a mixed solvent, and the final product is an extract containing the entrainer. It should be noted that the amount of entrainer used is generally very small.

[0046] The entrainer assembly 60 also includes an entrainer container, and an entrainer delivery pump 61 delivers the entrainer to the extraction vessel 41 through a three-way valve 63.

[0047] The difference between the technical solution of Embodiment 4 and the technical solution of Embodiment 3 is (not shown in the figure). The three-way valve can be two valves, which are respectively set on two branches. That is, one valve is set on the fifth pipeline 62 and the other valve is set on the third pipeline 42. Specifically, it is the third pipeline 42 at the connection between the water bath assembly of the third pipeline 42 and the fifth pipeline 62.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A laboratory supercritical extraction kettle device, characterized in that: include: A carbon dioxide container assembly (10), the carbon dioxide container assembly (10) comprising a pressure container (11), a bottle head valve structure (12) and a conduit (13), the bottle head valve structure (12) being sealingly arranged at a container port of the pressure container (11), the conduit (13) sealingly passing through the bottle head valve structure (12), a first end of the conduit (13) being located inside the pressure container (11) and having a predetermined distance from a bottom wall of the pressure container (11), and a second end of the conduit (13) being located outside the pressure container (11); A compression assembly (20), the compression assembly (20) comprising a heat-insulating shell (21), a compression device (22), a first pipeline (23) and a refrigeration structure (24), the compression device (22) and the refrigeration structure (24) being both arranged in the heat-insulating shell (21), and an inlet of the compression device (22) being connected to the second end of the conduit (13) via the first pipeline (23); A water bath assembly (30), the water bath assembly (30) comprising a water bath structure (31) and a second pipeline (32), a first end of the second pipeline (32) being connected to an outlet of the compression device (22), and the second pipeline (32) being at least partially disposed within the water bath structure (31); An extraction kettle assembly (40), the extraction kettle assembly (40) comprising an extraction kettle (41), a third pipeline (42), a fourth pipeline (43) and a valve (44), the first end of the third pipeline (42) being connected to the second end of the second pipeline (32), the second end of the third pipeline (42) being connected to the inlet of the extraction kettle (41), the first end of the fourth pipeline (43) being connected to the outlet of the extraction kettle (41), and the valve (44) being arranged on the fourth pipeline (43).

2. The laboratory supercritical extraction kettle device according to claim 1, characterized in that: The extraction kettle assembly (40) further comprises a heating structure (45), wherein the heating structure (45) is arranged on the outer wall of the extraction kettle (41).

3. The laboratory supercritical extraction kettle device according to claim 2, characterized in that: The heating structure (45) comprises a heating resistance wire, and the heating resistance wire is wound around the outer wall of the extraction kettle (41).

4. The laboratory supercritical extraction kettle device according to any one of claims 1 to 3, characterized in that: The extraction kettle assembly (40) further comprises a filtering sieve plate (46), wherein the filtering sieve plate (46) is arranged inside the extraction kettle (41) and is located at the outlet end of the extraction kettle (41).

5. The laboratory supercritical extraction kettle device according to claim 4, characterized in that: The extraction kettle (41) comprises a supporting step, which is located at the outlet of the extraction kettle (41) and extends inwardly, and the edge of the filtering screen plate (46) is placed on the supporting step.

6. The laboratory supercritical extraction kettle device according to claim 5, characterized in that: The filtering screen plate (46) comprises a screen plate body and a plurality of screen holes arranged on the screen plate body, wherein the distance between adjacent screen holes at the edge of the screen plate body is smaller than the distance between adjacent screen holes near the center of the screen plate body.

7. The laboratory supercritical extraction kettle device according to claim 4, characterized in that: The extraction kettle (41) comprises an inlet connection section (411), an extraction kettle body (412) and an extraction kettle outlet section (413); the inlet connection section (411) is connected to the first end of the extraction kettle body (412); the extraction kettle outlet section (413) is connected to the second end of the extraction kettle body (412); the inner wall of the inlet connection section (411) has an internal thread; the inner wall diameter of the inlet connection section (411) is larger than the inner wall diameter of the extraction kettle body (412), so that a portion of the end surface of the first end of the extraction kettle body (412) forms a sealing step.

8. The laboratory supercritical extraction kettle device according to claim 4, characterized in that: The extraction kettle (41) comprises an inlet connection section (411), an extraction kettle body (412) and an extraction kettle outlet section (413); the inlet connection section (411) and the extraction kettle outlet section (413) are respectively connected to two ends of the extraction kettle body (412); the inner wall of the extraction kettle body (412) has a plurality of channel grooves extending along an axis; a connection between the extraction kettle outlet section (413) and the extraction kettle body (412) has a support groove; the filter screen plate (46) comprises a screen plate body, a plurality of screen holes and a plurality of support protrusions; the plurality of screen holes are arranged on the screen plate body; the plurality of support protrusions are located on the circumferential outer side of the screen plate body; and the plurality of support protrusions are matched with the plurality of channel grooves.

9. The laboratory supercritical extraction kettle device according to claim 1, characterized in that: The laboratory supercritical extraction kettle device further comprises a heat-insulating layer (50), and the heat-insulating layer (50) is disposed on the circumferential outer sides of the first pipeline (23), the second pipeline (32), the third pipeline (42), and the fourth pipeline (43).

10. The laboratory supercritical extraction kettle device according to claim 1, characterized in that: The laboratory supercritical extraction kettle device further comprises an entrainer assembly (60), wherein the entrainer assembly (60) comprises an entrainer delivery pump (61), a fifth pipeline (62) and a three-way valve (63), wherein the outlet of the entrainer delivery pump (61) is connected to the inlet of the fifth pipeline (62), and the outlet of the fifth pipeline (62) is connected to the third pipeline (42) via the three-way valve (63).

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