A supercritical carbon dioxide extraction system

Abstract

The application provides a supercritical carbon dioxide extraction system, which comprises a carbon dioxide storage tank, a high-pressure pump, an extraction kettle and a separator, the discharge port of the carbon dioxide storage tank is connected with the feed inlet of the high-pressure pump, the discharge port of the high-pressure pump is connected with the feed inlet of the extraction kettle, the discharge port of the extraction kettle is connected with the separator, and the discharge port of the separator leads to a finished product collecting tank; the extraction kettle comprises a kettle body, a cover body and an inner cylinder, the cover body is detachably connected with the kettle body, and the cover body is provided with a compression spring clamping rod; the inner wall of the bottom of the kettle body is provided with a jacking groove, the jacking groove is communicated with the gas inlet of the kettle body and the inner bottom surface of the kettle body, and a jacking strip is slidably arranged in the jacking groove; the inner cylinder is detachably sleeved into the kettle body, the outer bottom surface of the inner cylinder is in contact with the inner bottom surface of the kettle body, the inner cylinder is provided with a plug-in groove, and the side of the plug-in groove, which is directed to the axis of the inner cylinder, is provided with an elastic layer; and the distance from the plug-in groove to the compression spring clamping rod is greater than the thickness of the second hollow layer. The application does not need to consider the temperature of the inner cylinder and can conveniently take out the inner cylinder from the kettle body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extraction production machinery, in particular to a supercritical carbon dioxide extraction system. BACKGROUND

[0002] The principle of supercritical carbon dioxide fluid extraction (SFE) separation process is to use the relationship between the solubility of supercritical fluid and its density, that is, to use the influence of pressure and temperature on the solubility of supercritical fluid. In the supercritical state, the supercritical fluid is contacted with the material to be separated, so that it selectively extracts the components with different polarity, boiling point and molecular weight.

[0003] When using the supercritical carbon dioxide extraction system for extraction, most of the extraction kettle working gas CO2 is from the bottom of the extraction kettle, and the CO2 gas is fully contacted with the extraction material after extraction, and then discharged from the upper end of the extraction kettle. The solid material in the extraction kettle is placed in the extraction kettle after being loaded in the inner cylinder of the extraction kettle. In order to ensure the extraction effect, the outer surface of the upper end of the inner cylinder must be sealed well with the inner cylinder of the extraction kettle. Therefore, when the extraction kettle is filled with CO2, the inner cylinder of the extraction kettle bears external pressure. After the extraction is completed, the extraction kettle needs to be depressurized, and the inner cylinder can be taken out only after the temperature of the extraction kettle drops to room temperature, which prolongs the time of replacing the inner cylinder. Therefore, how to conveniently take out the inner cylinder after depressurization is the main problem to be solved.

[0004] In addition, supercritical carbon dioxide fluid extraction is mostly suitable for extracting ester-soluble components such as oil and essential oil, and a small number of supercritical carbon dioxide fluid extraction is used to extract water-soluble components such as polysaccharides by adjusting the polarity of the solvent with a carrier. After the target extract is extracted, it needs to be separated from carbon dioxide in a separator, and then sent to a finished product collection tank for collection. However, when the target extract comes out of the separator, since the separator and the collection tank are connected by a pipeline and there are gaps at the connection of the pipeline, the temperature at the connection of the separator and the collection tank is different from the temperature at other positions of the pipeline. When the temperature is too low, the target extract is easy to accumulate on the inner wall of the pipeline at the connection of the separator and the collection tank, which eventually causes the pipeline to be blocked. At this time, the connecting pipe between the separator and the finished product collection tank needs to be disconnected for cleaning, which delays the production progress. Therefore, how to clean the accumulated target extract without disassembling the pipeline connecting the separator and the finished product collection tank is another problem to be solved. SUMMARY

[0005] The present application aims to solve at least one of the above technical problems, and provides a supercritical carbon dioxide extraction system which can conveniently take out the inner cylinder from the kettle body without considering the temperature of the inner cylinder.

[0006] To achieve the above object, the technical scheme adopted by the present application is:

[0007] A supercritical carbon dioxide extraction system, comprising a carbon dioxide storage tank, a high-pressure pump, an extraction kettle and a separator, the discharge port of the carbon dioxide storage tank is connected with the feed port of the high-pressure pump, the discharge port of the high-pressure pump is connected with the feed port of the extraction kettle, the discharge port of the extraction kettle is connected with the separator, and the discharge port of the separator leads to a finished product collection tank.

[0008] Further, the extraction kettle comprises a kettle body, a cover and an inner cylinder, the cover is inserted into the upper end of the kettle body and is detachably connected with the upper end of the kettle body through a clamp, a sealing element is arranged on the cover, the sealing element comprises a first hollow layer and a second hollow layer, the first hollow layer and the second hollow layer are adjacent and the second hollow layer is located on the side of the cover facing the kettle body, a clamping groove is arranged on the side of the second hollow layer away from the first hollow layer, and a compression spring clamping rod is arranged on the inner wall of the cover corresponding to the clamping groove; a jacking groove is arranged on the inner wall of the bottom of the kettle body, the jacking groove is communicated with the gas inlet of the kettle body and the inner bottom surface of the kettle body, and a jacking strip is slidably arranged in the jacking groove; the inner cylinder is detachably sleeved into the kettle body, the outer bottom surface of the inner cylinder is in contact with the inner bottom surface of the kettle body, an insertion groove is arranged on the inner cylinder, and an elastic layer is arranged on the side of the insertion groove facing the axis of the inner cylinder; the distance from the insertion groove to the compression spring clamping rod is greater than the thickness of the second hollow layer.

[0009] Further, the cover comprises an outer cover and an inner extension ring, the outer cover is in contact with the upper end surface of the kettle body, the inner extension ring is connected with the outer cover and extends into the kettle body, the clamping groove is located in the inner extension ring, and the compression spring clamping rod is arranged on the inner extension ring; the kettle body is provided with a receiving step corresponding to the inner extension ring, the receiving step extends towards the axis of the kettle body, and the upper end of the kettle body is provided with a clamping flange outside; the clamp is provided with a clamping groove corresponding to the outer cover and the clamping flange.

[0010] Further, a sealing element mounting groove is arranged on the outer cover, the sealing element mounting groove comprises an upper ring groove and a lower ring groove communicated with the upper ring groove, the upper ring groove is arranged on the side of the lower ring groove away from the kettle body, and the diameter of the upper ring groove is greater than the diameter of the lower ring groove, so that a step structure is formed at the connection between the upper ring groove and the lower ring groove; the first hollow layer and the second hollow layer are both located in the lower ring groove and are both adapted to the inner diameter of the lower ring groove.

[0011] Further, the sealing element comprises a solid sealing layer, the top outer edge of the solid sealing layer extends outward to form a sealing ring outer protrusion, the sealing ring outer protrusion cooperates with the upper ring groove, and the first hollow layer is connected with the solid sealing layer.

[0012] Further, the inner cylinder comprises a cylinder cover and a barrel, the cylinder cover is detachably arranged on one end of the barrel by screw thread, the barrel is detachably sleeved into the kettle body, and the cylinder cover is supported on the supporting step; the cylinder cover is provided with the plug-in slot.

[0013] Further, the jacking groove comprises a jacking end, a pressure inlet end and a sliding section, the jacking end and the pressure inlet end are communicated with opposite ends of the sliding section, the inner diameters of the jacking end and the pressure inlet end are greater than the inner diameter of the sliding section, the jacking end is communicated with the inner bottom surface of the kettle body, and the pressure inlet end is communicated with the gas inlet of the kettle body; the jacking strip comprises a jacking flange, a sliding strip and a limiting flange, one end of the jacking flange is connected with one end of the sliding strip, the outer diameter of the sliding strip is matched with the inner diameter of the sliding section, and the length of the sliding strip is greater than the length of the sliding section, the limiting flange is connected with the other end of the sliding strip, and the outer diameter of the limiting flange is greater than the inner diameter of the sliding section.

[0014] Further, the supercritical carbon dioxide extraction system further comprises an inner wall cleaning piece, the inner wall cleaning piece comprises two connecting ends, a sliding ring, an outer magnet block, an inner magnet block and a wall cleaning part, the two connecting ends are connected with opposite ends of the sliding ring, the outer magnet block is slidably arranged outside the sliding ring and in contact with the outer surface of the sliding ring, the inner magnet block is slidably arranged inside the sliding ring and in contact with the inner surface of the sliding ring, the inner magnet block and the outer magnet block are magnetically combined with each other, and the wall cleaning part is connected with the inner magnet block and in contact with the inner wall of the pipeline connected with the separator and the finished product collecting tank.

[0015] Further, the number of the wall cleaning parts is two, the two wall cleaning parts are connected with opposite end faces of the outer magnet block and extend away from the outer magnet block, one end of the wall cleaning part away from the outer magnet block is provided with a scraper, and the scraper is in contact with the inner wall of the corresponding pipeline and the inner wall of the corresponding connecting end.

[0016] Further, the number of the wall cleaning parts is two, the two wall cleaning parts are connected with opposite end faces of the outer magnet block and extend away from the outer magnet block, one end of the wall cleaning part away from the outer magnet block is provided with a scraper, and the scraper is in contact with the inner wall of the corresponding pipeline and the inner wall of the corresponding connecting end.

[0017] Due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0018] In the pressure relief process, the valve opening speed of the extraction kettle outlet pressure relief valve cannot be accurately controlled by manual operation, resulting in "too fast" pressure relief. For the extraction kettle containing extraction materials, "too fast" pressure relief will cause the extraction kettle inlet pressure to be greater than the outlet pressure. When the extraction kettle of the above-mentioned supercritical carbon dioxide extraction system is relieved, when the pressure of the air inlet of the extraction kettle is greater than that of the air outlet, the pressure of the top-up groove connected to the air inlet end increases. The pressure pushes the top-up strip to move outward from the inner bottom surface of the kettle body, the inner cylinder is lifted in the direction of the cover body, the second hollow layer is flattened, and when the inner cylinder is lifted to the compression spring clamp rod inserted into the insertion groove, the inner cylinder is fixed with the cover body. When the pressure relief is completed, the clamp is removed, and the cover body is pulled out along the length direction of the kettle body, the inner cylinder is pulled out together with the cover body. It can be seen that in the supercritical carbon dioxide extraction system in the embodiment, the temperature of the inner cylinder does not need to be considered when the inner cylinder of the extraction kettle is replaced, and the inner cylinder can be conveniently taken out from the kettle body. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a structural schematic diagram of the supercritical carbon dioxide extraction system in the present application.

[0020] Figure 2 The figure is a structural schematic diagram of the extraction kettle in the present application. Figure 1 The figure is a sectional view of the extraction kettle in the present application.

[0021] Figure 3 The figure is an enlarged view of A in the present application. Figure 2 The figure is an enlarged view of B in the present application.

[0022] Figure 4 The figure is a structural schematic diagram of the inner wall cleaning member in the present application. Figure 2 The figure is a structural schematic diagram of the inner wall cleaning member in the present application.

[0023] Figure 5 The figure is a structural schematic diagram of the inner wall cleaning member in the present application.

[0024] Figure 6 The figure is a structural schematic diagram of the inner wall cleaning member in the present application. Figure 5 The figure is a structural schematic diagram of the inner wall cleaning member in the present application.

[0025] Figure 7 The figure is a connection schematic diagram of the brush body.

[0026] In the drawings, 101 - carbon dioxide storage tank, 102 - high pressure pump, 103 - extraction kettle, 1 - kettle body, 10 - clamping flange, 11 - jacking groove, 111 - jacking end, 112 - inlet pressure end, 113 - sliding section, 12 - jacking strip, 121 - jacking flange, 122 - sliding strip, 123 - limit flange, 13 - receiving step, 14 - air inlet, 15 - gas outlet, 2 - cover, 21 - external cover, 211 - upper ring groove, 212 - lower ring groove, 22 - inner extension ring, 221 - clamping groove, 222 - compression spring clamping rod, 23 - clamp, 230 - clamping groove, 231 - bolt, 3 - inner cylinder, 31 - cylinder cover, 311 - plug-in groove, 312 - elastic layer, 32 - barrel, 4 - sealing element, 40 - solid sealing layer, 401 - sealing ring outer protrusion, 41 - first hollow layer, 42 - second hollow layer, 104 - separator, 105 - tail gas collection tank, 106 - compressor, 200 - inner wall cleaning element, 201 - connecting end, 202 - sliding ring, 203 - outer magnet block, 2031 - guide rod, 204 - inner magnet block, 205 - wall cleaning part, 206 - inner sliding ring, 207 - clamping groove, 208 - connecting rod, 2091 - scraper, 2092 - brush body. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be an intervening component. When a component is referred to as being "disposed" on another component, it can be directly on the other component or there can be an intervening component. The terms "vertical", "horizontal", "left", "right" and similar terms as used herein are for purposes of description only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0030] Embodiment one:

[0031] As Figure 1As shown, a preferred embodiment of the present application provides a supercritical carbon dioxide extraction system, which comprises a carbon dioxide storage tank 101, a high-pressure pump 102, an extraction kettle 103, a separator 104, a tail gas collection tank 105 and a compressor 106. The discharge port of the carbon dioxide storage tank 101 is connected to the feed port of the high-pressure pump 102 through a pipeline. The discharge port of the high-pressure pump 102 is connected to the feed port of the extraction kettle 103 through a pipeline. The discharge port of the extraction kettle 103 is connected to the separator 104 through a pipeline. The discharge port of the separator 104 is connected to a pipeline leading to a finished product collection tank. The gas inlet of the tail gas collection tank 105 is connected to the gas outlet of the separator 104. The gas inlet of the compressor 106 is connected to the gas outlet of the tail gas collection tank 105. The gas outlet of the compressor 106 is connected to the gas inlet of the carbon dioxide storage tank 101.

[0032] The carbon dioxide storage tank 101 is used for storing carbon dioxide. The carbon dioxide enters the high-pressure pump 102 for processing and then enters the extraction kettle 103 to extract the material in the extraction kettle 103. The extraction mixture enters the separator 104, which separates the extraction mixture into finished products and carbon dioxide gas. The carbon dioxide gas enters the tail gas collection tank 105 and the compressor 106 in turn and is then transported to the carbon dioxide storage tank 101 for use in the next cycle of extraction operation. The finished products are transported to the finished product collection tank for processing in the next process.

[0033] In the above-mentioned supercritical carbon dioxide extraction system, the carbon dioxide after completing a cycle of extraction operation is treated by the tail gas collection tank 105 and the compressor 106 and then transported to the carbon dioxide storage tank 101, which can make full use of the carbon dioxide.

[0034] In the present embodiment, as shown, Figures 2 to 4 The extraction kettle 103 comprises a kettle body 1, a cover body 2 and an inner cylinder 3. The cover body 2 is inserted into the upper end of the kettle body 1 and detachably connected to the upper end of the kettle body 1 by a clamp 23. The cover body 2 is provided with a sealing element 4, which comprises a first hollow layer 41 and a second hollow layer 42. The first hollow layer 41 and the second hollow layer 42 are adjacent, and the second hollow layer 42 is located on the side of the cover body 2 facing the kettle body 1. The side of the second hollow layer 42 away from the first hollow layer 41 is provided with a clamping groove 221, and the inner wall of the cover body 2 corresponding to the clamping groove 221 is provided with a compressed spring clamping rod 222. The bottom inner wall of the kettle body 1 is provided with a jacking groove 11, which communicates with the gas inlet 14 of the kettle body 1 and the inner bottom surface of the kettle body 1. A jacking strip 12 is slidably arranged in the jacking groove 11. The inner cylinder 3 is detachably sleeved into the kettle body 1. The outer bottom surface of the bottom of the inner cylinder 3 is in contact with the inner bottom surface of the kettle body 1. The inner cylinder 3 is provided with an insertion groove 311, and the side of the insertion groove 311 facing the axis of the inner cylinder 3 is provided with an elastic layer 312. When the outer bottom surface of the bottom of the inner cylinder 3 is in contact with the inner bottom surface of the kettle body 1, the distance from the insertion groove 311 to the compressed spring clamping rod 222 is greater than the thickness of the second hollow layer 42.

[0035] In the pressure relief process, the valve opening speed of the outlet pressure relief valve of the extraction kettle 103 cannot be accurately controlled by manual operation, resulting in "too fast" pressure relief. For the extraction kettle 103 containing extraction materials, "too fast" pressure relief will cause the inlet pressure of the extraction kettle 103 to be greater than the outlet pressure. When the extraction kettle 103 of the supercritical carbon dioxide extraction system is pressure relieved, and the pressure of the air inlet 14 of the extraction kettle 103 is greater than that of the air outlet 15, the pressure of the top-up groove 11 connected to one end of the air inlet 14 increases. This pressure pushes the top-up strip 12 to move outward from the inner bottom surface of the kettle body 1. The top-up strip 12 lifts the inner cylinder 3 in the direction of the cover body 2. The inner cylinder 3 flattens the second hollow layer 42. When the inner cylinder 3 is lifted to the point where the compression spring clamping rod 222 is inserted into the insertion groove 311, the inner cylinder 3 is fixed to the cover body 2. When the pressure relief is complete, the clamp 23 is removed, and the cover body 2 is pulled up along the length of the kettle body 1, the inner cylinder 3 is pulled out together with the cover body 2. It can be seen that in the supercritical carbon dioxide extraction system in this embodiment, when replacing the inner cylinder 3 of the extraction kettle 103, the temperature of the inner cylinder 3 does not need to be considered, and the inner cylinder 3 can be easily taken out of the kettle body 1.

[0036] In this embodiment, the cover body 2 includes an outer cover 21 and an inner extension ring 22. The outer cover 21 is in contact with the upper end surface of the kettle body 1, and the inner extension ring 22 is connected to the outer cover 21 and extends into the kettle body 1. The clamping groove 221 is located in the inner extension ring 22, and the compression spring clamping rod 222 is installed on the inner extension ring 22. The kettle body 1 is provided with a receiving step 13 corresponding to the inner extension ring 22, which extends towards the axis of the kettle body 1. The upper end of the kettle body 1 is provided with a clamping flange 10. The clamp 23 is provided with a clamping groove 230 corresponding to the outer cover 21 and the clamping flange 10. The number of clamps 23 is two, and the two clamps 23 are symmetrically clamped on the cover body 2 and the outside of the kettle body 1 with the axis of the kettle body 1 as the axis. When connecting the cover body 2 and the kettle body 1, the inner extension ring 22 is inserted into the opening of the kettle body 1. When the inner extension ring 22 is received on the receiving step 13, the outer cover 21 is in contact with the upper end surface of the kettle body 1. After the clamp 23 is clamped around the outer cover 21 and the kettle body 1 corresponding to the clamping groove 230, the clamp 23, the outer cover 21 and the kettle body 1 are fixed by the bolt 231.

[0037] In this embodiment, the outer cover 21 is provided with a sealing element mounting groove, which includes an upper ring groove 211 and a lower ring groove 212 connected to the upper ring groove 211. The upper ring groove 211 is arranged on the side of the lower ring groove 212 away from the kettle body 1, and the diameter of the upper ring groove 211 is greater than that of the lower ring groove 212, so as to form a step structure at the connection between the upper ring groove 211 and the lower ring groove 212. The first hollow layer 41 and the second hollow layer 42 are both located in the lower ring groove 212 and are adapted to the inner diameter of the lower ring groove 212.

[0038] In the embodiment, the sealing member 4 comprises a solid sealing layer 40, and the top outer edge of the solid sealing layer 40 extends outwardly to form a sealing ring outer protrusion 401 which is matched with the upper ring groove 211, and the first hollow layer 41 is connected with the solid sealing layer 40.

[0039] In the embodiment, the inner cylinder 3 comprises a cylinder cover 31 and a cylinder barrel 32, and the cylinder cover 31 is detachably arranged on one end of the cylinder barrel 32 by screwing. The cylinder barrel 32 is used for containing materials to be extracted, and the cylinder barrel 32 is detachably sleeved into the kettle body 1 and the cylinder cover 31 is received on the receiving step 13. The cylinder cover 31 is provided with a plug-in groove 311.

[0040] In the embodiment, the jacking groove 11 and the jacking strip 12 away from the cover body 2 are both arc-shaped. The jacking groove 11 comprises a jacking end 111, a pressure inlet end 112 and a sliding section 113. The jacking end 111 and the pressure inlet end 112 are connected with opposite ends of the sliding section 113, and the inner diameters of the jacking end 111 and the pressure inlet end 112 are both greater than the inner diameter of the sliding section 113. The jacking end 111 is communicated with the inner bottom surface of the kettle body 1, and the pressure inlet end 112 is communicated with the gas inlet 14 of the kettle body 1.

[0041] The jacking strip 12 comprises a jacking flange 121, a sliding strip 122 and a limiting flange 123. One end of the jacking flange 121 is connected with one end of the sliding strip 122, the outer diameter of the sliding strip 122 is matched with the inner diameter of the sliding section 113, and the length of the sliding strip 122 is greater than the length of the sliding section 113. The limiting flange 123 is connected with the other end of the sliding strip 122, and the outer diameter of the limiting flange 123 is greater than the inner diameter of the sliding section 113. When the pressure of the gas inlet of the kettle body 1 is greater than the pressure of the gas outlet 15, the pressure of the gas inlet enters the pressure inlet end 112 and pushes the limiting flange 123 towards the jacking end 111, and the sliding strip 122 slides along the sliding section 113, so that the jacking flange 121 is pushed out to the outside of the inner bottom surface of the kettle body 1, thereby jacking the cylinder barrel 32 towards the cover body 2. Since the outer diameter of the sliding strip 122 is matched with the inner diameter of the sliding section 113, the pressure can be prevented from passing from the jacking groove 11 to the inside of the kettle body 1 in the process of pressure relief. Since the length of the sliding strip 122 is greater than the length of the sliding section 113, when the limiting flange 123 is subjected to pressure, the sliding strip 122 can slide along the sliding section 113. When the jacking flange 121 is pushed out to the outside of the inner bottom surface of the kettle body 1, since the outer diameter of the limiting flange 123 is greater than the inner diameter of the sliding section 113, the limiting flange 123 is limited outside the sliding section 113, that is, the jacking strip 12 can be prevented from being separated from the jacking groove 11.

[0042] In the embodiment, referring to Figure 5 and Figure 6The supercritical carbon dioxide extraction system further comprises an inner wall cleaning piece 200, which comprises two connecting ends 201, a sliding ring 202, an outer magnet block 203, an inner magnet block 204, and a wall cleaning part 205. The two connecting ends 201 are connected to opposite ends of the sliding ring 202, one of which is used to connect the discharge port of the separator 104, and the other is used to connect the pipeline leading to the finished product collection tank. The outer surfaces of the two connecting ends 201 are provided with external threads, which are used to connect the connecting ends 201 to the corresponding components.

[0043] The outer magnet block 203 is slidably arranged outside the sliding ring 202 and in contact with the outer surface of the sliding ring 202. Specifically, the sliding ring 202 is made of polyvinyl chloride, and the outer diameter of the sliding ring 202 is smaller than that of the two connecting ends 201. Each of the two connecting ends 201 is provided with a guide rail facing the sliding ring 202, and the guide rail extends along the circumference of the sliding ring 202. The outer magnet block 203 extends towards the two guide rails with guide rods 2031, and the ends of the guide rods 2031 away from the outer magnet block 203 are slidably connected to the corresponding guide rails. When the outer magnet block 203 is pushed along the circumference of the sliding ring 202, the guide rods 2031 slide along the guide rails, and the outer magnet block 203 moves along the circumference of the sliding ring 202, and the two guide rods 2031 can limit the outer magnet block 203 between the two connecting ends 201.

[0044] The inner magnet block 204 is slidably arranged inside the sliding ring 202 and in contact with the inner surface of the sliding ring 202. The inner magnet block 204 is magnetically combined with the outer magnet block 203. The wall cleaning part 205 is connected to the inner magnet block 204 and in contact with the inner wall of the pipeline connecting the separator 104 and the finished product collection tank. Specifically, the wall cleaning part 205 comprises two inner sliding rings 206, a connecting rod 208, and a scraper 2091. The inner sliding ring 206 is connected to the inner wall of the connecting end 201 at one end. The inner magnet block 204 is provided with a clamping groove 207 at opposite ends, which is clamped on the inner sliding ring 206 at one end. One end of the connecting rod 208 is connected to the outer wall of the clamping groove 207, and the other end of the connecting rod 208 extends away from the inner magnet block 204. One end of the scraper 2091 extends into the corresponding connecting end 201 and is connected to the other end of the connecting rod 208. The other end of the scraper 2091 extends away from the inner magnet block 204. The scraper 2091 is curved away from the axis of the sliding ring 202, so that the scraper 2091 is in contact with the inner wall of the corresponding moving connecting end 201 and the inner wall of the corresponding pipeline.

[0045] One of the connection ends 201 is connected to the outlet of the separator 104, and the other connection end 201 is connected to a pipeline leading to a product collection tank. When the target extract of the supercritical carbon dioxide extraction system is an ester-soluble component and the ester-soluble component accumulates at the connection between the connection end 201 and the corresponding pipeline, the outer magnet block 203 is pushed along the outer wall of the sliding ring 202, and the outer magnet block 203 drives the inner magnet block 204 to move along the circumference of the inner sliding ring 206, so that the scraper 2091 can scrape off the ester-soluble component on the inner wall of the connection end 201 and the inner wall of the corresponding pipeline, and the scraped-off ester-soluble component flows to the product collection tank through the pipeline. It can be seen that the arrangement of the inner wall cleaning piece 200 can clean and reduce the accumulation of the ester-soluble component at the pipeline connection without disassembling the connection between the separator 104 and the product collection tank. Due to the characteristics of the ester-soluble component, it has strong adhesion to the inner wall of the pipeline, and the scraper 2091 can better scrape it off from the inner wall of the pipeline.

[0046] Working principle: Put the material to be extracted into the barrel 32, cover the barrel 32 with the barrel cover 31, and insert the barrel 32 into the kettle body 1, and make the outer bottom surface of the inner cylinder 3 contact with the inner bottom surface of the kettle body 1. At this time, the barrel cover 31 is supported on the support step 13. After pressing the compression spring clamp rod 222, the inner extension ring 22 is inserted into the upper end of the kettle body 1 and supported on the support step 13. At this time, the barrel cover 31 is located in the clamping groove 221 and contacts with the bottom surface of the second hollow layer 42. The compression spring clamp rod 222 is in a compressed state and presses against the side surface of the barrel cover 31. The outer cover 21 contacts with the upper end surface of the kettle body 1. After clamping the outer cover 21 and the kettle body 1 with the clamp 23 corresponding to the clamping groove 230, the clamp 23, the outer cover 21 and the kettle body 1 are fixed with the bolt 231.

[0047] When the extraction kettle 103 starts to work, the inner cylinder 3 is subjected to the working pressure for extraction operation, and the inner cylinder 3 extrudes the second hollow layer 42, so that the inner cylinder 3 and the second hollow layer 42 are sealed. In this process, the working pressure pushes the lifting strip 12 to correspond to the lifting end 111 of the lifting flange 121; after completing the extraction operation, the extraction kettle 103 is manually depressurized. When the pressure of the gas inlet 14 of the extraction kettle 103 is greater than that of the gas outlet 15, the pressure of the pressure end 112 increases, which pushes the lifting flange 121 to move outwardly along the inner bottom surface of the kettle body 1. The lifting flange 121 lifts the inner cylinder 3 in the direction of the cover body 2, and the barrel cover 31 flattens the second hollow layer 42 together with the first hollow layer 41. When the barrel cover 31 is lifted to the point that the compression spring clamp rod 222 is inserted into the insertion groove 311, the barrel cover 31 is fixed with the cover body 2. When the depressurization is completed, the clamp 23 is removed, and the cover body 2 is pulled out along the length direction of the kettle body 1, so that the inner cylinder 3 is pulled out together with the cover body 2.

[0048] The barrel 32 is detached from the barrel cover 31, the compressed spring clamping rod 222 is extruded from the plug-in slot 311 by pressing the elastic layer 312, and then the barrel cover 31 is detached from the inner extension ring 22.

[0049] When the target extract of the supercritical carbon dioxide extraction system is an ester-soluble component and the ester-soluble component accumulates at the connecting end 201 and the corresponding pipeline connection, the outer magnet block 203 is pushed along the outer wall of the sliding ring 202, the outer magnet block 203 drives the inner magnet block 204 to move along the circumference of the inner sliding ring 206, and then the scraper 2091 scrapes off the ester-soluble component on the inner wall of the connecting end 201 and the inner wall of the corresponding pipeline, and the scraped ester-soluble component flows to the finished product collection tank through the pipeline.

[0050] It can be understood that, in other embodiments, referring to Figure 7 In other embodiments, the wall cleaning part 205 includes an inner sliding ring 206, a connecting rod 208, and a brush body 2092, the inner sliding ring 206 is connected to the inner wall of the connecting end 201 at the corresponding end, the opposite ends of the inner magnet block 204 are provided with clamping grooves 207, the clamping grooves 207 are clamped on the inner sliding ring 206 at the corresponding end, one end of the connecting rod 208 is connected to the outer wall of the clamping groove 207 at the corresponding end, the other end of the connecting rod 208 extends away from the inner magnet block 204, one end of the brush body 2092 extends into the corresponding connecting end 201 and is connected to the other end of the connecting rod 208, the other end of the brush body 2092 faces away from the inner magnet block 204, and the brush body 2092 is bent away from the axis of the sliding ring 202, so that the brush body 2092 is in contact with the inner wall of the corresponding moving connecting end 201 and the inner wall of the corresponding pipeline.

[0051] One of the connecting ends 201 is connected to the discharge port of the separator 104, and the other connecting end 201 is connected to the pipeline leading to the finished product collection tank. When the target extract of the supercritical carbon dioxide extraction system is polysaccharide and the polysaccharide accumulates at the connecting end 201 and the corresponding pipeline connection, the outer magnet block 203 is pushed along the outer wall of the sliding ring 202, the outer magnet block 203 drives the inner magnet block 204 to move along the circumference of the inner sliding ring 206, and then the brush body 2092 can sweep off the polysaccharide on the inner wall of the connecting end 201 and the inner wall of the corresponding pipeline, and the swept polysaccharide flows to the finished product collection tank through the pipeline. It can be seen that the arrangement of the inner wall cleaning part 200 can clean and reduce the accumulation of polysaccharide at the pipeline connection without detaching the connection between the separator 104 and the finished product collection tank. Due to the characteristics of polysaccharide, it is easy to form granular accumulation on the inner wall of the pipeline. Compared with the scraper 2091, the brush body 2092 can better sweep the polysaccharide particles from the inner wall of the pipeline, that is, the scraper 2091 is easy to press the polysaccharide particles on the inner wall of the pipeline, which makes the inner wall of the pipeline more difficult to clean.

[0052] It can be understood that, in other embodiments, the wall cleaning part 205 can be omitted.

[0053] Example 2:

[0054] like Figure 1 As shown, a preferred embodiment of the present invention provides a supercritical carbon dioxide extraction system, including a carbon dioxide storage tank 101, a high-pressure pump 102, an extraction vessel 103, a separator 104, a tail gas collection tank 105, and a compressor 106. The outlet of the carbon dioxide storage tank 101 is connected to the inlet of the high-pressure pump 102 via a pipeline. The outlet of the high-pressure pump 102 is connected to the inlet of the extraction vessel 103 via a pipeline. The outlet of the extraction vessel 103 is connected to the separator 104 via a pipeline. The outlet of the separator 104 is connected to a pipeline leading to a finished product collection tank. The inlet of the tail gas collection tank 105 is connected to the outlet of the separator 104. The inlet of the compressor 106 is connected to the outlet of the tail gas collection tank 105. The outlet of the compressor 106 is connected to the inlet of the carbon dioxide storage tank 101.

[0055] Carbon dioxide storage tank 101 is used to store carbon dioxide. After being processed by high-pressure pump 102, carbon dioxide enters extraction vessel 103 to extract the material in extraction vessel 103. The extracted mixture enters separator 104, which separates the extracted mixture into finished product and carbon dioxide gas. The carbon dioxide gas enters tail gas collection tank 105 and compressor 106 in sequence, and then is transported back to carbon dioxide storage tank 101 for a new cycle of extraction. The finished product is transported to finished product collection pool for the next processing step.

[0056] In the supercritical carbon dioxide extraction system described above, the carbon dioxide after completing one cycle of extraction is processed by the tail gas collection tank 105 and the compressor 106 and then transported to the carbon dioxide storage tank 101, which enables the carbon dioxide to be fully utilized.

[0057] In this embodiment, see Figure 5 and Figure 6 The supercritical carbon dioxide extraction system also includes an inner wall cleaning component 200, which includes two connecting ends 201, a sliding ring 202, an outer magnet block 203, an inner magnet block 204, and a cleaning section 205. The two connecting ends 201 connect to opposite ends of the sliding ring 202. One connecting end 201 is used to connect to the outlet of the separator 104, and the other connecting end 201 is used to connect to the pipeline leading to the finished product collection tank. The outer surfaces of both connecting ends 201 are provided with external threads for connecting the connecting ends 201 to corresponding components.

[0058] The outer magnet block 203 is slidably arranged outside the sliding ring 202 and in contact with the outer surface of the sliding ring 202. Specifically, the sliding ring 202 is made of polyvinyl chloride, and the outer diameter of the sliding ring 202 is smaller than that of the two connecting ends 201. Each of the two connecting ends 201 is provided with a guide rail on the side facing the sliding ring 202, and the guide rail extends along the circumference of the sliding ring 202. The outer magnet block 203 extends towards the two guide rails with guide rods 2031, and the ends of the guide rods 2031 away from the outer magnet block 203 are slidably fitted with the corresponding guide rails. When the outer magnet block 203 is pushed along the circumference of the sliding ring 202, the guide rods 2031 slide along the guide rails, and the outer magnet block 203 moves along the circumference of the sliding ring 202, and the two guide rods 2031 can limit the outer magnet block 203 between the two connecting ends 201.

[0059] The inner magnet block 204 is slidably arranged inside the sliding ring 202 and in contact with the inner surface of the sliding ring 202. The inner magnet block 204 is magnetically combined with the outer magnet block 203. The cleaning wall part 205 is connected with the inner magnet block 204, and the cleaning wall part 205 is in contact with the inner wall of the pipeline connecting the separator 104 and the finished product collection tank. Specifically, the number of cleaning wall parts 205 is two, and the two cleaning wall parts 205 are located at opposite ends of the inner magnet block 204. The cleaning wall part 205 includes an inner sliding ring 206, a connecting rod 208, and a scraper 2091. The inner sliding ring 206 is connected with the inner wall of the connecting end 201 at the corresponding end. The opposite ends of the inner magnet block 204 are provided with clamping grooves 207, which are clamped on the inner sliding ring 206 at the corresponding end. One end of the connecting rod 208 is connected to the outer wall of the clamping groove 207 at the corresponding end, and the other end of the connecting rod 208 extends away from the inner magnet block 204. One end of the scraper 2091 extends into the corresponding connecting end 201 and is connected with the other end of the connecting rod 208. The other end of the scraper 2091 is away from the inner magnet block 204. The scraper 2091 is curved away from the axis of the sliding ring 202, so that the scraper 2091 is in contact with the inner wall of the corresponding moving connecting end 201 and the inner wall of the corresponding pipeline.

[0060] One of the connecting ends 201 is connected with the outlet of the separator 104, and the other connecting end 201 is connected with a pipeline leading to a product collection tank. When the target extract of the supercritical carbon dioxide extraction system is an ester-soluble component and the ester-soluble component accumulates at the connecting end 201 and the corresponding pipeline, the outer magnet block 203 is pushed along the outer wall of the sliding ring 202, and the outer magnet block 203 drives the inner magnet block 204 to move along the circumference of the inner sliding ring 206, so that the scraper 2091 can scrape off the ester-soluble component on the inner wall of the connecting end 201 and the inner wall of the corresponding pipeline, and the scraped-off ester-soluble component flows to the product collection tank through the pipeline. It can be seen that the arrangement of the inner wall cleaning member 200 can clean and reduce the accumulation of the ester-soluble component at the pipeline connection without disassembling the connection between the separator 104 and the product collection tank. Due to the characteristics of the ester-soluble component, it has strong adhesion to the inner wall of the pipeline, and the scraper 2091 can better scrape it off from the inner wall of the pipeline.

[0061] Working principle:

[0062] When the target extract of the supercritical carbon dioxide extraction system is an ester-soluble component and the ester-soluble component accumulates at the connecting end 201 and the corresponding pipeline, the outer magnet block 203 is pushed along the outer wall of the sliding ring 202, and the outer magnet block 203 drives the inner magnet block 204 to move along the circumference of the inner sliding ring 206, so that the scraper 2091 can scrape off the ester-soluble component on the inner wall of the connecting end 201 and the inner wall of the corresponding pipeline, and the scraped-off ester-soluble component flows to the product collection tank through the pipeline.

[0063] It can be understood that, in other embodiments, referring to Figure 7 In other embodiments, the wall cleaning part 205 includes an inner sliding ring 206, a connecting rod 208, and a brush body 2092. The inner sliding ring 206 is connected with the inner wall of the connecting end 201 at one end. The opposite ends of the inner magnet block 204 are provided with clamping grooves 207, which are clamped on the inner sliding ring 206 at the corresponding end. One end of the connecting rod 208 is connected to the outer wall of the clamping groove 207, and the other end of the connecting rod 208 extends away from the inner magnet block 204. One end of the brush body 2092 extends into the corresponding connecting end 201 and is connected with the other end of the connecting rod 208. The other end of the brush body 2092 faces away from the inner magnet block 204. The brush body 2092 is curved away from the axis of the sliding ring 202, so that the brush body 2092 is in contact with the inner wall of the corresponding moving connecting end 201 and the inner wall of the corresponding pipeline.

[0064] One of the connection ends 201 is connected to the outlet of the separator 104, and the other connection end 201 is connected to a pipeline leading to a product collection tank. When the target extract of the supercritical carbon dioxide extraction system is polysaccharide and the polysaccharide accumulates at the connection between the connection end 201 and the corresponding pipeline, the outer magnet block 203 is pushed along the outer wall of the sliding ring 202, and the outer magnet block 203 drives the inner magnet block 204 to move along the circumference of the inner sliding ring 206, so that the brush body 2092 can sweep the polysaccharide on the inner wall of the connection end 201 and the inner wall of the corresponding pipeline, and the swept polysaccharide flows to the product collection tank through the pipeline. It can be seen that the arrangement of the inner wall cleaning member 200 can clean and reduce the accumulation of polysaccharide at the pipeline connection without disassembling the connection between the separator 104 and the product collection tank. Due to the characteristics of polysaccharide, it is easy to form granular accumulation on the inner wall of the pipeline. Compared with the scraper 2091, the brush body 2092 can better sweep the polysaccharide particles from the inner wall of the pipeline, that is, the scraper 2091 is easy to press the polysaccharide particles on the inner wall of the pipeline, which makes it more difficult to clean the inner wall of the pipeline.

[0065] The above description is a detailed description of the preferred embodiments of the present application, but the embodiments are not intended to limit the scope of the patent application of the present application. Any equivalent changes or modifications made under the technical spirit of the present application should be included in the scope of the patent.

Claims

1. A supercritical carbon dioxide extraction system, characterized by: The device comprises a carbon dioxide storage tank (101), a high-pressure pump (102), an extraction kettle (103) and a separator (104), the discharge port of the carbon dioxide storage tank (101) is connected with the feed port of the high-pressure pump (102), the discharge port of the high-pressure pump (102) is connected with the feed port of the extraction kettle (103), the discharge port of the extraction kettle (103) is connected with the separator (104), and the discharge port of the separator (104) leads to a finished product collection tank. The extraction kettle (103) comprises a kettle body (1), a cover body (2) and an inner cylinder (3), the cover body (2) is inserted into the upper end of the kettle body (1) and detachably connected with the upper end of the kettle body (1) through a clamp (23), a sealing element (4) is arranged on the cover body (2), the sealing element (4) comprises a first hollow layer (41) and a second hollow layer (42), the first hollow layer (41) is adjacent to the second hollow layer (42), and the second hollow layer (42) is located on the side of the cover body (2) facing the kettle body (1), a clamping groove (221) is arranged on the side of the second hollow layer (42) away from the first hollow layer (41), and a compression spring clamping rod (222) is arranged on the inner wall of the cover body (2) corresponding to the clamping groove (221); a jacking groove (11) is arranged on the inner bottom wall of the kettle body (1), the jacking groove (11) is connected with the gas inlet (14) of the kettle body (1) and the inner bottom surface of the kettle body (1), and a jacking strip (12) is slidably arranged in the jacking groove (11); the inner cylinder (3) is detachably sleeved into the kettle body (1), the outer bottom surface of the inner cylinder (3) is in contact with the inner bottom surface of the kettle body (1), an insertion groove (311) is arranged on the inner cylinder (3), and a resilient layer (312) is arranged on the side of the insertion groove (311) facing the axis of the inner cylinder (3); the distance from the insertion groove (311) to the compression spring clamping rod (222) is greater than the thickness of the second hollow layer (42); The jacking groove (11) comprises a jacking end (111), a pressure inlet end (112) and a sliding section (113), the jacking end (111) and the pressure inlet end (112) are connected with opposite ends of the sliding section (113), the inner diameters of the jacking end (111) and the pressure inlet end (112) are greater than the inner diameter of the sliding section (113), the jacking end (111) is connected with the inner bottom surface of the kettle body (1), and the pressure inlet end (112) is connected with the gas inlet (14) of the kettle body (1); the jacking strip (12) comprises a jacking flange (121), a sliding strip (122) and a limiting flange (123), one end of the jacking flange (121) is connected with one end of the sliding strip (122), the outer diameter of the sliding strip (122) is matched with the inner diameter of the sliding section (113), the length of the sliding strip (122) is greater than the length of the sliding section (113), the limiting flange (123) is connected with the other end of the sliding strip (122), and the outer diameter of the limiting flange (123) is greater than the inner diameter of the sliding section (113).

2. A supercritical carbon dioxide extraction system as claimed in claim 1, wherein: The cover (2) comprises an outer cover (21) and an inner extension ring (22), the outer cover (21) is in contact with the upper end surface of the kettle body (1), the inner extension ring (22) is connected with the outer cover (21) and extends into the kettle body (1), the clamping groove (221) is located in the inner extension ring (22), and the compression spring clamping rod (222) is arranged on the inner extension ring (22); the kettle body (1) is provided with a receiving step (13) corresponding to the inner extension ring (22), the receiving step (13) extends towards the axis of the kettle body (1), and the upper end of the kettle body (1) is externally provided with a clamping flange (10); the clamping hoop (23) is provided with a clamping groove (230) corresponding to the outer cover (21) and the clamping flange (10).

3. A supercritical carbon dioxide extraction system as claimed in claim 2, wherein: The outer cover (21) is provided with a sealing element mounting groove, the sealing element mounting groove comprises an upper ring groove (211) and a lower ring groove (212) in communication with the upper ring groove (211), the upper ring groove (211) is arranged on the side of the lower ring groove (212) away from the kettle body (1), and the diameter of the upper ring groove (211) is greater than the diameter of the lower ring groove (212), so that a step structure is formed at the connection between the upper ring groove (211) and the lower ring groove (212); the first hollow layer (41) and the second hollow layer (42) are both located in the lower ring groove (212) and are adapted to the inner diameter of the lower ring groove (212).

4. A supercritical carbon dioxide extraction system as claimed in claim 3, wherein: The sealing element (4) comprises a solid sealing layer (40), the top outer edge of the solid sealing layer (40) extends outward to form a sealing ring outer protrusion (401), the sealing ring outer protrusion (401) is matched with the upper ring groove (211), and the first hollow layer (41) is connected with the solid sealing layer (40).

5. A supercritical carbon dioxide extraction system as claimed in claim 4, characterised in that: The inner cylinder (3) comprises a cylinder cover (31) and a cylinder barrel (32), the cylinder cover (31) is detachably arranged at one end of the cylinder barrel (32) through threads, the cylinder barrel (32) is detachably sleeved into the kettle body (1), and the cylinder cover (31) is received on the receiving step (13); the cylinder cover (31) is provided with the plug-in groove (311).

6. A supercritical carbon dioxide extraction system as defined in claim 1, wherein: The supercritical carbon dioxide extraction system further comprises an inner wall cleaning element (200), the inner wall cleaning element (200) comprises two connecting ends (201), a sliding ring (202), an outer magnet block (203), an inner magnet block (204) and a wall cleaning part (205), the two connecting ends (201) are connected to opposite ends of the sliding ring (202), the outer magnet block (203) is slidably arranged outside the sliding ring (202) and in contact with the outer surface of the sliding ring (202), the inner magnet block (204) is slidably arranged inside the sliding ring (202) and in contact with the inner surface of the sliding ring (202), the inner magnet block (204) and the outer magnet block (203) are magnetically combined with each other, the wall cleaning part (205) is connected with the inner magnet block (204), and the wall cleaning part (205) is in contact with the inner wall of the pipeline connecting the separator (104) and the finished product collecting tank.

7. A supercritical carbon dioxide extraction system as claimed in claim 6, characterised in that: The number of the wall cleaning parts (205) is two, the two wall cleaning parts (205) are connected to opposite two end faces of the outer magnet block (203) and extend in a direction away from the outer magnet block (203), one end of the wall cleaning part (205) away from the outer magnet block (203) is provided with a scraper (2091), and the scraper (2091) is in contact with the inner wall of the corresponding pipeline and the inner wall of the corresponding connecting end (201).

8. A supercritical carbon dioxide extraction system as claimed in claim 7, characterised in that: The number of the wall cleaning parts (205) is two, the two wall cleaning parts (205) are connected to opposite two end faces of the outer magnet block (203) and extend in a direction away from the outer magnet block (203), one end of the wall cleaning part (205) away from the outer magnet block (203) is provided with a scraper (2091), and the scraper (2091) is in contact with the inner wall of the corresponding pipeline and the inner wall of the corresponding connecting end (201).

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