Supercritical extraction equipment for edible oil processing

Abstract

The invention relates to the technical field of edible oil supercritical extraction, in particular to a supercritical extraction device for edible oil processing, which comprises an extraction kettle, an input pipe, an output pipe, a stirring assembly and a discharge assembly. By arranging the stirring assembly, the stirring assembly rotates, so that a stirring effect is provided for seeds in the extraction kettle, the situation that the seeds form aggregates under the action of pressure to affect the infiltration rate of supercritical fluid is avoided, the seeds become loose through stirring, the contact area and the mixing rate of the seeds and the supercritical fluid are increased, and then the extraction efficiency of the seeds is improved; meanwhile, part of the seeds can be broken in the stirring process, so that grease in the seeds can be separated out more easily, and the extraction efficiency is improved; in addition, the extraction kettle is divided into an inner area and an outer area by taking the spiral plate as a boundary, so that the seeds circularly move in the extraction kettle, the flowability of the seeds is improved, the mixing rate of the seeds and the supercritical fluid is improved, and the extraction efficiency and the extraction effect of the seeds are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of supercritical extraction of edible oil, and specifically to a supercritical extraction device for edible oil processing. Background Art

[0002] Supercritical extraction technology is a process for extracting edible oil using CO in a supercritical state. 2 CO 2 There is a critical point of temperature and pressure between the gaseous and liquid states. CO fluid with temperature and pressure higher than this critical point is called supercritical CO fluid, which has the high solubility of a liquid, high diffusivity, and strong penetrability of a gas. Supercritical extraction utilizes this property to dissolve and extract the oil in oilseeds. 2 supercritical CO fluid 2 Its process is as follows (as shown): Feed supercritical CO into a high-pressure extraction kettle to fully contact with the oilseeds. The supercritical CO fluid, as the solvent of the plant material, dissolves the required compounds and then is discharged through a pipeline, and then enters the separation kettle through a pressure reducing valve. In the separation kettle, the pressure-reduced CO gasifies and is instantaneously separated from the oil, and then circulates to the CO storage tank. At this time, the edible oil required remains in the separation kettle.

[0003] Its process is as (as Figure 1 shown): Feed supercritical CO 2 into a high-pressure extraction kettle to fully contact with the oilseeds. The supercritical CO 2 fluid, as the solvent of the plant material, dissolves the required compounds and then is discharged through a pipeline, and then enters the separation kettle through a pressure reducing valve. In the separation kettle, the pressure-reduced CO 2 gasifies and is instantaneously separated from the oil, and then circulates to the CO 2 storage tank. At this time, the edible oil required remains in the separation kettle.

[0004] Seabuckthorn seeds are a raw material for making edible oil. The edible oil produced from them is the so-called sea buckthorn oil, which is an edible oil with high nutritional value. However, due to the small particle size of the seabuckthorn seeds and the poor fluidity between the seeds, the pressure of the supercritical CO fluid in the extraction kettle will cause the seeds to aggregate and stick tightly together, resulting in a reduced contact area with the supercritical fluid, thereby affecting the wetting rate of the supercritical fluid on these aggregates and further reducing the extraction rate. 2 fluid pressure will cause the seeds to aggregate and stick tightly together, resulting in a reduced contact area with the supercritical fluid, thereby affecting the wetting rate of the supercritical fluid on these aggregates and further reducing the extraction rate.

[0005] Therefore, a supercritical extraction device for edible oil processing is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a supercritical extraction device for edible oil processing, which solves the problem that seabuckthorn seeds with a relatively small particle size form aggregates under the pressure of the extraction kettle, resulting in a poor wetting rate of the fluid on them, and further affecting the extraction efficiency. By setting a stirring component and a discharging component, while the stirring component disperses the seeds in the extraction kettle, the internal space of the extraction kettle is divided into two regions. The materials are transported upward in the internal region, and the seeds in the external region fall under the action of gravity, enhancing their fluidity and making them loose. And the supercritical fluid is discharged by the discharging component into the seeds in the falling region to improve its wetting rate.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A supercritical extraction device for edible oil processing includes an extraction kettle, an input pipe and an output pipe. The input pipe is connected to the bottom of the extraction kettle, and the output pipe is connected to the upper end of the extraction kettle. It also includes a stirring component and a discharging component. The stirring component is connected to the middle of the extraction kettle and is communicated with the input pipe. The space in the extraction kettle is divided into two internal and external regions with the outer edge of the stirring component as the boundary. Among them, the inner region is the rising area, and the outer region is the falling area. The discharging component is arranged in the stirring component, and the discharging component connects the input pipe with the internal space of the extraction kettle. The fluid enters the inside of the stirring component from the input pipe and drives it to rotate. The fluid inside the stirring component is discharged by the discharging component at the falling area, and the fluid after extracting the oil flows out from the output pipe.

[0009] Through the above solution, the stirring component stirs the seeds in the extraction kettle, avoiding the formation of aggregates under the action of pressure due to the poor fluidity of the seeds, making them loose and enhancing their fluidity, increasing the contact area between the seeds and the supercritical fluid, making it easier for the supercritical fluid to wet them, and improving the extraction rate. In addition, the stirring component will provide a certain degree of shear force to the seeds during the working process, which can break their cell walls and make the oil inside them easier to precipitate, further improving the extraction rate. In addition, the supercritical fluid is discharged by the discharging component at different height position areas in the extraction kettle, changing the traditional way of introducing from the bottom layer, enabling the supercritical fluid to contact the seeds in the extraction kettle more quickly and fully. At the same time, the discharging component rotates with the stirring component, and can provide a certain power for the discharge of the fluid through centrifugal force, thereby increasing its flow rate, which helps to improve the solute transfer rate between the oil and the solvent in the seeds, and further improves the extraction rate.

[0010] Preferably, the stirring component includes a roller, a sealed bearing and a transmission plate. The roller is arranged in the middle of the extraction kettle, and the bottom of the roller is connected to the extraction kettle through a sealed bearing. A plurality of the transmission plates are connected inside the roller, and the transmission plates are in a spiral shape as a whole.

[0011] Through the above solution, after the supercritical fluid enters from the bottom of the roller, it will contact the transmission plate. Due to the special shape of the transmission plate, the movement of the fluid will drive the transmission plate to rotate, and then drive the roller to rotate. When there is a large amount of seeds, in order to shorten the extraction time, usually the flow rate and velocity of the supercritical fluid are increased to accelerate the extraction of oil from the seeds. However, when the amount of seeds increases, the stirring difficulty usually increases. Therefore, the stirring rate is correlated with the flow velocity of the supercritical fluid. When the flow velocity of the supercritical fluid increases, the transmission plate driven by the supercritical fluid will increase the rotation speed of the roller, so that the stirring component can adaptively adjust the stirring rate according to needs.

[0012] Preferably, the stirring component further includes a spiral plate, the spiral plate is connected to the outer wall of the roller, and the pitch between every two layers of the spiral plate gradually decreases from bottom to top.

[0013] Through the above solution, the seeds in the extraction kettle are stirred by the spiral plate. In addition, the outer boundary line of the spiral plate is the boundary between the rising area and the falling area. The rotation of the spiral plate drives the seeds in the rising area to move upward, sends the seeds to the top and then ejects them into the falling area, so that they fall under the action of gravity. The change of the pitch of the spiral plate can gradually apply pressure to the seeds during the upward feeding process, making the oil inside the seeds easier to precipitate, thus accelerating the extraction efficiency.

[0014] Preferably, an inclined surface is provided on the side of the spiral plate away from the roller, and the inclined surface is inclined downward in the direction of the falling area.

[0015] Through the above solution, a relatively sharp corner can be formed at the upper edge of the inclined surface, which provides a certain shearing force to the falling seeds during rotation, destroys the cell walls of the seeds, thus accelerating the precipitation of oil and further improving the extraction rate.

[0016] Preferably, the discharge component includes a flow channel, a discharge port and a filter screen. A plurality of the flow channels are opened in the spiral plate and the roller, and the flow channels are communicated with the internal space of the roller. The discharge port is connected to the other end of the flow channel and communicated with the internal space of the extraction kettle, and the filter screen is connected to the discharge port.

[0017] Through the above solution, the supercritical fluid pumped into the roller will enter the flow channel and finally enter the extraction kettle from the discharge port to be mixed with the seeds. In this solution, the discharge port is arranged on the spiral plate, which can not only make the supercritical fluid discharged at the same height position in the extraction kettle, improving its mixing efficiency with the seeds, on the other hand, the discharge port will rotate with the spiral plate, thus improving the uniformity of the discharge of the supercritical fluid and further improving its extraction efficiency.

[0018] Preferably, the flow channel is a tapered hole, and its diameter value gradually decreases along the direction close to the discharge port.

[0019] Through the above solution, the supercritical fluid flows from a region with a larger space to a region with a smaller space inside the flow channel, which can accelerate its flow rate and make it discharged in a jet form, thereby enhancing its penetrability, enabling the supercritical fluid to contact the seeds near the inner wall of the extraction kettle faster, and thus improving the extraction efficiency.

[0020] Preferably, the discharge port is arranged at the inclined surface, and the opening direction faces the descending area.

[0021] Through the above solution, since the seeds in the descending area fall downward, tilting the opening direction of the discharge port downward can, to a certain extent, prevent the seeds from being squeezed near the discharge port and affecting the discharge of the supercritical fluid; in addition, since the seeds in the descending area are prone to becoming loose during the falling process, making it easier for the supercritical fluid to penetrate, the supercritical fluid is discharged into the descending area through the discharge assembly, enabling it to directly contact the loose seeds, accelerating the wetting speed of the supercritical fluid on the seeds in the extraction kettle, and thus improving the extraction efficiency.

[0022] Preferably, a stopper is connected to the upper end of the spiral plate, and the edge of the stopper is an arc surface.

[0023] Through the above solution, when the seeds are conveyed to the upper end by the spiral plate, they will move along the inclined surface of the stopper to the outer circle, and then move to the descending area, and then cooperate with the spiral plate to complete the circular movement of the seeds in the extraction kettle.

[0024] Preferably, a conical block is connected to the upper end of the roller, the diameter of the bottom end of the conical block is the same as the diameter of the cross-section of the roller, and the diameter of the upper end of the conical block is smaller than the inner diameter of the output pipe.

[0025] Through the above solution, it can not only make the seeds at the top slide down, avoiding the situation that after the spiral plate pushes the seeds to the top, the seeds stay at the top of the roller and cannot participate in the stirring, which affects the extraction efficiency; but also gradually reduce the aperture of the supercritical fluid entering the output pipe, thereby accelerating the flow rate.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. A supercritical extraction device for edible oil processing according to the present invention, by providing a stirring assembly, the stirring assembly rotates to provide a stirring effect on the seeds in the extraction kettle, avoiding the formation of aggregates under pressure and affecting the infiltration rate of the supercritical fluid. By stirring, it becomes loose, thus accelerating its contact area and mixing rate with the supercritical fluid, and further enhancing its extraction efficiency. At the same time, during the stirring process, some seeds will break, making the oil inside them easier to precipitate, thus accelerating the extraction efficiency. In addition, with the spiral plate as the boundary, the extraction kettle is divided into two inner and outer regions, enabling the seeds to circulate in the extraction kettle, enhancing their fluidity, thus enhancing their mixing rate with the supercritical fluid, and further enhancing their extraction efficiency and extraction effect.

[0028] 2. A supercritical extraction device for edible oil processing according to the present invention. In this solution, in addition to stirring the seeds, the inclined surface design of the spiral plate will form a relatively sharp corner at its upper edge, providing a certain degree of shear force to the seeds during rotation, thus breaking the cell walls of the seeds, accelerating the precipitation of oil, and further enhancing the extraction efficiency. In addition, by designing the pitch of the spiral plate, the pitch between every two layers gradually decreases from bottom to top. Therefore, during the upward movement of the seeds, they will be subjected to extrusion due to the gradually decreasing pitch, thus achieving a certain pressing effect, making the oil inside the seeds easier to precipitate, and further accelerating their extraction efficiency.

[0029] 3. A supercritical extraction device for edible oil processing according to the present invention. By providing flow channels and discharge ports, flow channels are opened at multiple height positions of the spiral rod, enabling the supercritical fluid to be discharged simultaneously at different height positions in the extraction kettle, thus enhancing its mixing efficiency with the seeds in the extraction kettle. The change in the aperture of the flow channels can accelerate the flow rate of the supercritical fluid, enhance its penetration when discharged, making it easier to come into full contact with the seeds, and enhancing its infiltration rate. By setting the discharge port at the inclined surface, the supercritical fluid flowing out from the flow channels can be directly discharged into the descending area, directly contacting the loose seeds, thus accelerating the infiltration speed of the supercritical fluid to the seeds in the extraction kettle, and further improving the extraction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the process flow chart of the supercritical extraction technology of the present invention;

[0031] Figure 2 is the overall structural schematic diagram of the extraction kettle of the present invention;

[0032] Figure 3 is the partial structural schematic diagram of the internal components of the extraction kettle of the present invention;

[0033] Figure 4 is the position schematic diagram of the ascending area and the descending area of the present invention;

[0034] Figure 5 It is a schematic structural diagram of the inside of the roller of the present invention;

[0035] Figure 6 It is a schematic structural diagram of the discharge assembly of the present invention;

[0036] Figure 7 It is a schematic structural diagram of the stopper and the conical block of the present invention;

[0037] Figure 8 It is a state diagram of the circulating movement of the seeds between the rising area and the falling area of the present invention.

[0038] In the figure: a, rising area; b, falling area; 1, extraction kettle; 101, cylinder body; 102, upper cover; 2, input pipe; 3, output pipe; 4, stirring assembly; 401, roller; 402, sealing bearing; 403, transmission plate; 404, spiral plate; 405, inclined surface; 5, discharge assembly; 501, flow channel; 502, discharge port; 503, filter screen; 6, stopper; 7, conical block. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1 to 8 , the present invention provides a supercritical extraction device for edible oil processing, and the technical solution is as follows:

[0041] Specifically, please refer to Figures 1 to 5 , a supercritical extraction device for edible oil processing, including an extraction kettle 1, an input pipe 2 and an output pipe 3. The extraction kettle 1 is in a barrel shape as a whole and is divided into a cylinder body 101 and an upper cover 102. The input pipe 2 is connected to the bottom of the cylinder body 101 and is connected to CO 2The storage tank is connected, and the output pipe 3 is connected to the upper end of the upper cover 102 and communicates with the separation kettle. It further includes a stirring component 4 and a discharging component 5. The stirring component 4 is rotatably connected to the middle of the extraction kettle 1 and communicates with the input pipe 2. When the stirring component 4 rotates, it stirs the seeds in the extraction kettle 1, preventing them from forming aggregates under pressure and affecting the infiltration rate of the supercritical fluid. While improving its fluidity, it makes the seeds loose, thereby increasing the mixing speed of the seeds and the supercritical fluid, further accelerating the infiltration rate of the supercritical fluid into the seeds, and then improving the extraction rate and extraction effect. Taking the outer edge of the stirring component 4 as the boundary, the space in the extraction kettle 1 is divided into two inner and outer regions. The inner region is the rising region a, and the outer region is the falling region b, so that the seeds circulate in the extraction kettle 1, improving their fluidity, thereby enhancing the mixing rate with the supercritical fluid, and then improving the extraction efficiency and extraction effect.

[0042] The discharging component 5 is arranged inside the stirring component 4, and the discharging component 5 connects the input pipe 2 with the internal space of the extraction kettle 1. The supercritical fluid is discharged at different height position regions in the extraction kettle 1 through the discharging component 5, enabling the supercritical fluid to come into full contact with the seeds in the extraction kettle 1 more quickly. At the same time, the centrifugal force generated by rotation will also accelerate the discharging speed of the supercritical fluid, thereby accelerating the solute transfer speed between the oil and the supercritical fluid, and then improving the extraction efficiency.

[0043] As an implementation mode of the present invention, referring to Figure 3 , Figure 4 and Figure 5 , the stirring component 4 includes a roller 401, a sealed bearing 402 and a transmission plate 403. The roller 401 is arranged in the middle of the extraction kettle 1. The roller 401 is a hollow cylinder, and its bottom end is provided with an opening and communicates with the input pipe 2. After the supercritical fluid enters from the input pipe 2, it will enter the inside of the roller 401 from the bottom opening of the roller 401. And the bottom opening of the roller 401 is connected to the extraction kettle 1 through the sealed bearing 402, enabling the roller 401 to rotate relative to the extraction kettle 1. A plurality of the transmission plates 403 are connected inside the roller 401. After the supercritical fluid is introduced from the bottom of the roller 401, it will contact the transmission plates 403. Since the transmission plates 403 are in a spiral shape as a whole, the movement of the fluid will drive the transmission plates 403 to rotate around the central axis of the roller 401, and then drive the roller 401 to rotate. When the flow rate of the supercritical fluid increases, the transmission plates 403 driven by the supercritical fluid will increase the rotation speed of the roller 401, so that the stirring component 4 can adaptively adjust the stirring rate as needed.

[0044] The stirring assembly 4 further includes a spiral plate 404, which is connected to the outer wall of the roller 401. The rotation of the roller 401 will drive the spiral plate 404 to rotate, thereby stirring the seed material in the extraction kettle 1. At the same time, an inclined surface 405 is provided on the side of the spiral plate 404 away from the roller 401. The inclined surface 405 is inclined downward in the direction of the descending area b, so that a relatively sharp corner can be formed at the upper edge of the inclined surface 405. When rotating, a certain shearing force is provided to the falling seed material, and the cell wall of the seed material is destroyed, thereby accelerating the oil precipitation and further improving the extraction rate. When the spiral plate 404 rotates, it will drive the seed material in the ascending area a to move upward. The pitch between every two layers of the spiral plate 404 gradually decreases from bottom to top. Therefore, during the upward movement of the seed material, the change in the pitch of the spiral plate 404 will gradually apply pressure to the seed material, making the oil inside it easier to be precipitated, thereby improving the extraction efficiency. When the seed material is sent to the top, it will be pushed out to the descending area b, and then it will fall under the action of gravity. During the falling process, the seed material will become loose, thereby accelerating the infiltration speed of the supercritical fluid into the seed material in the extraction kettle 1, and further improving the extraction efficiency.

[0045] As an implementation manner of the present invention, referring to Figure 5 and Figure 6, the discharge assembly 5 includes a flow channel 501, a discharge port 502, and a filter screen 503. A plurality of the flow channels 501 are formed in the spiral plate 404 and the roller 401, and the flow channels 501 communicate with the inner space of the roller 401. The flow channels 501 are tapered holes, and their diameter values gradually decrease along the direction close to the discharge port 502. The supercritical fluid flows from a region with a larger space to a region with a smaller space inside the flow channel 501, which can accelerate its flow rate and discharge it in a jet form, thereby enhancing its penetrability, making it easier to fully contact the seeds, improving its infiltration rate, and thus enhancing the extraction efficiency. The discharge port 502 is connected to the other end of the flow channel 501 and communicates with the inner space of the extraction kettle 1. The discharge port 502 is arranged at the inclined surface 405 and its opening faces the descending area b. Since the seeds in the descending area b fall downward, tilting the opening of the discharge port 502 downward can, to a certain extent, prevent the seeds from being squeezed near the discharge port 502 and affecting the discharge of the supercritical fluid. In addition, since the seeds in the descending area b are prone to becoming loose during the falling process, making it easier for the supercritical fluid to penetrate, the supercritical fluid is discharged in the descending area b through the discharge assembly 5, enabling it to directly contact the loose seeds, accelerating the infiltration speed of the supercritical fluid into the seeds in the extraction kettle 1, and thus improving the extraction efficiency. The supercritical fluid pumped into the roller 401 enters the flow channel 501 and finally enters the extraction kettle 1 from the discharge port 502 to be mixed with the seeds. In this solution, the discharge port 502 is arranged on the spiral plate 404, which can not only enable the supercritical fluid to be discharged at various height positions in the extraction kettle 1 simultaneously, improving its mixing efficiency with the seeds, but also, on the other hand, the discharge port 502 rotates with the spiral plate 404, thereby enhancing the uniformity of the supercritical fluid discharge and further improving the extraction efficiency. The filter screen 503 is connected to the discharge port 502 and can block the seed dregs outside the discharge port 502 to prevent them from entering the flow channel 501 and affecting the normal discharge of the supercritical fluid.

[0046] As an implementation manner of the present invention, referring to Figure 7 , a stopper 6 is fixedly connected to the upper end of the spiral plate 404. The edge of the stopper 6 is an arc surface. When the seeds are sent to the upper part of the extraction kettle 1, the seeds will be blocked by the stopper 6 and move outward along the inclined surface 405 of the stopper 6, then move from the ascending area a to the descending area b, and then fall back to the bottom of the extraction kettle 1 from the descending area b, thereby cooperating with the spiral plate 404 to complete the circular movement of the seeds in the extraction kettle 1.

[0047] The upper end of the roller 401 is connected with a conical block 7. Under the conveying action of the spiral plate 404, part of the seed material is likely to stay on the top of the roller 401. By arranging the conical block 7 at the bottom of the roller 401, the seed material on the top can slide down, so as to avoid the spiral plate 404 pushing the seed material to the top and the seed material staying on the top of the roller 401 and unable to participate in stirring, thereby affecting the extraction efficiency; the bottom end diameter of the conical block 7 is the same as the diameter of the cross section of the roller 401, and the upper end diameter of the conical block 7 is smaller than the inner diameter of the output tube 3, which can gradually reduce the aperture of the supercritical fluid entering the output tube 3, thereby accelerating the flow rate and improving the extraction efficiency.

[0048] The specific working principle is as follows: first open the upper cover 102 of the extraction kettle 1, then put the seed material to be extracted into the cylinder 101, cover the upper cover 102 and seal it. Then, the CO 2 The supercritical CO 2 The fluid is input into the extraction kettle 1 through the input pipe 2 to fully contact with the seed material, dissolves the oil in the seed material and is discharged from the output pipe 3. After being depressurized by the pressure reducing valve, it is discharged into the separation kettle. The supercritical CO 2 The fluid is depressurized and then turns back into a gaseous state and circulates to the CO 2 In the storage tank, what is left in the separation kettle is the required edible oil.

[0049] In order to prevent the seed material from forming aggregates and affecting the extraction rate, the present solution is provided with a stirring component 4, which is used to stir the seed material in the extraction kettle 1 to enhance its fluidity, so that the supercritical fluid can more easily completely infiltrate the seed material, thereby improving the extraction rate; specifically, by providing a spiral plate 404, the seed material can be stirred when the spiral plate 404 rotates. In addition, the spiral plate 404 can transport the seed material at the bottom of the ascending area a upward, and then push the seed material at the top into the descending area b through the block 6 to make it fall, thereby making the seed material circulate in the extraction kettle 1, thereby improving its fluidity, thereby accelerating the mixing rate of the seed material and the supercritical fluid, and thereby improving its extraction efficiency.

[0050] In order to make it easier for the oil in the seed material to precipitate, the present invention provides an inclined surface 405 on the edge of the spiral plate 404, and forms a sharper corner through the inclined surface 405, thereby destroying the cell wall of the seed material during its rotation, making it easier for the oil to precipitate, thereby improving the extraction efficiency; in addition, the pitch of the spiral plate 404 in the present invention gradually decreases from bottom to top, which means that pressure will be gradually applied to the seed material during the rising process, thereby achieving a certain squeezing effect, thereby making it easier for the oil inside to precipitate, further improving the extraction rate.

[0051] In addition, the rotation of the roller 401 and the spiral plate 404 is mainly achieved by the flow of the supercritical fluid and the transmission of the transmission plate 403. Since the transmission plate 403 is spiral as a whole, the fluid flow will cause the transmission plate 403 to rotate, thereby driving the roller 401 and the spiral plate 404 to rotate. Therefore, when the fluid flow rate changes, the rotation speeds of the roller 401 and the spiral plate 404 driven by the transmission plate 403 will also change accordingly, so that the spiral plate 404 can adaptively adjust the stirring rate as needed.

[0052] Since the input pipe 2 is arranged at the bottom of the extraction kettle 1, when the supercritical fluid contacts the seed material, it usually wets the seed material from the bottom up bit by bit. Such extraction efficiency is relatively low. Therefore, in this solution, the flow channels 501 and the discharge ports 502 are opened on the roller 401 and the spiral plate 404, and multiple groups are arranged at different heights, so that the supercritical fluid can be directly discharged to different height position areas in the extraction kettle 1 when discharged, enabling it to come into full contact with the seed material in the extraction kettle 1 faster.

[0053] In order to increase the fluid flow rate and thus the wetting rate of the seed material, the flow channel 501 in this solution is set as a tapered hole. When the fluid flows from the inside to the outside, the flow rate can be accelerated, enabling it to be discharged in a jet form, thereby enhancing its penetrability. At the same time, the centrifugal force generated by rotation will accelerate the discharge speed of the fluid, further accelerating the wetting rate of the fluid and the seed material, and thus improving the extraction efficiency.

[0054] In addition, since the seed material in the descending area b falls downward, it will be relatively loose and easier to be wetted by the fluid. The inclined surface 405 on the outside of the spiral plate 404 is just facing the descending area b. Therefore, in this solution, the discharge port 502 of the fluid is arranged on the inclined surface 405, so that the supercritical fluid directly contacts the relatively loose seed material in the descending area b after being discharged, thereby accelerating the mixing rate of the supercritical fluid and the seed material, further accelerating its wetting rate of the seed material, and thus improving its extraction efficiency.

[0055] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A supercritical extraction device for edible oil processing, comprising an extraction kettle (1), an input pipe (2) and an output pipe (3), wherein the input pipe (2) is connected to the bottom of the extraction kettle (1), and the output pipe (3) is connected to the upper end of the extraction kettle (1), characterized in that: The invention also comprises a stirring component (4) and a discharge component (5), wherein the stirring component (4) is connected to the middle of the extraction kettle (1) and is connected to the input pipe (2), and the space inside the extraction kettle (1) is divided into two inner and outer regions with the outer edge of the stirring component (4) as the boundary, wherein the inner region is the ascending region (a) and the outer region is the descending region (b), and the discharge component (5) is arranged inside the stirring component (4), and the discharge component (5) connects the input pipe (2) with the internal space of the extraction kettle (1), the fluid enters the stirring component (4) from the input pipe (2) and drives it to rotate, the fluid inside the stirring component (4) is discharged to the descending region (b) via the discharge component (5), and the fluid after the oil and fat is extracted flows out from the output pipe (3).

2. The supercritical extraction equipment for edible oil processing according to claim 1, characterized in that: The stirring assembly (4) comprises a roller (401), a sealed bearing (402) and a transmission plate (403); the roller (401) is arranged in the middle of the extraction kettle (1), and the bottom of the roller (401) is connected to the extraction kettle (1) via the sealed bearing (402); a plurality of transmission plates (403) are connected inside the roller (401), and the transmission plates (403) are spiral in shape as a whole.

3. The supercritical extraction equipment for edible oil processing according to claim 2, characterized in that: The stirring assembly (4) further comprises a spiral plate (404), wherein the spiral plate (404) is connected to the outer wall of the roller (401), and the pitch between every two layers of the spiral plate (404) gradually decreases from bottom to top.

4. The supercritical extraction equipment for edible oil processing according to claim 3, characterized in that: The spiral plate (404) is provided with an inclined surface (405) on one side away from the roller (401), and the inclined surface (405) is arranged to be inclined downward in the direction of the descending area (b).

5. The supercritical extraction equipment for edible oil processing according to claim 4, characterized in that: The discharge assembly (5) comprises a flow channel (501), a discharge port (502) and a filter (503); a plurality of the flow channels (501) are provided in the spiral plate (404) and the roller (401); the flow channels (501) are connected to the internal space of the roller (401); the discharge port (502) is connected to the other end of the flow channel (501) and is connected to the internal space of the extraction kettle (1); and the filter (503) is connected to the discharge port (502).

6. The supercritical extraction equipment for edible oil processing according to claim 5, characterized in that: The flow channel (501) is a tapered hole, and its diameter gradually decreases in the direction approaching the discharge port (502).

7. The supercritical extraction equipment for edible oil processing according to claim 5, characterized in that: The discharge port (502) is arranged on the inclined surface (405), and the opening is opened toward the descending area (b).

8. The supercritical extraction equipment for edible oil processing according to claim 3, characterized in that: The upper end of the spiral plate (404) is connected to a stopper (6), and the edge of the stopper (6) is an arc-shaped surface.

9. The supercritical extraction equipment for edible oil processing according to claim 2, characterized in that: The roller (401) The upper end of the roller (401) is connected to a conical block (7), the bottom end diameter of the conical block (7) being the same as the diameter of the cross section of the roller (401), The diameter of the upper end of the conical block (7) is smaller than the inner diameter of the output pipe (3).

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