An extraction device for essential oil of phoebe sheareraiana

Abstract

The application provides an extraction device for Phoebe sheareraiana oil, which comprises an extraction tower, a sieve plate assembly arranged in the extraction tower, a temperature control assembly for controlling the temperature in the extraction tower to decrease from the top of the extraction tower to the bottom of the extraction tower, and a feeding assembly arranged in the extraction tower and located above the sieve plate assembly, wherein the Phoebe sheareraiana extract solution falls on the sieve plate assembly through the feeding assembly. The supercritical carbon dioxide fluid flows upwards from the bottom of the extraction tower, and under the action of the sieve plate assembly, the supercritical carbon dioxide fluid and the extract solution are fully contacted, so that the extraction rate is greatly improved. The temperature control assembly is used for temperature control, so that the temperature of the extraction tower increases from the bottom to the top. With the increase of the temperature, the corresponding pressure also increases, which is beneficial to the more comprehensive contact and dissolution of the extract solution just entering the extraction tower at the uppermost part of the sieve plate assembly and the supercritical carbon dioxide fluid.

Description

Technical Field

[0001] This application relates to an extraction apparatus, and more particularly to an extraction apparatus for Phoebe zhennan wood essential oil. Background Technology

[0002] Golden silk nanmu, a precious wood, yields essential oils with unique aromas and potential medicinal value, showing broad application prospects in high-end fragrances, cosmetics, and pharmaceuticals. Supercritical carbon dioxide extraction technology, due to its advantages such as low extraction temperature, no solvent residue, and good selectivity, has become one of the important methods for extracting natural plant essential oils.

[0003] In existing supercritical carbon dioxide extraction devices, the extraction tower is usually the core component. Traditional extraction towers are mostly simple packed towers or empty towers. During operation, the material containing the target component (such as a solution of Phoebe zhennan extract) and supercritical carbon dioxide fluid are in countercurrent contact inside the tower, and mass transfer extraction is carried out by utilizing the concentration difference and pressure difference between the two.

[0004] However, such existing technologies have the following significant problems: Low mass transfer efficiency and insufficient extraction: In packed or empty tower structures, the contact area between supercritical carbon dioxide fluid and liquid material is limited, the flow path is irregular, and channeling or wall flow is easily generated, resulting in the two phases not being able to mix fully and uniformly.

[0005] Prone to clogging and poor operational continuity: When processing materials containing solid particles or high viscosity (such as extract solutions), the materials are prone to accumulate inside the tower or adhere to the tower walls and internal components, which not only reduces the effective mass transfer area but may also cause blockage of fluid channels.

[0006] Uneven fluid distribution and extraction dead zones: If there is no effective distribution device, the supercritical carbon dioxide fluid entering from the bottom of the column is prone to uneven distribution across the column cross-section during its ascent.

[0007] Based on the shortcomings of the existing technology, this application proposes a novel device for extracting essential oil from Phoebe zhennan wood, aiming to solve problems such as low mass transfer efficiency, easy clogging, and uneven fluid distribution. Utility Model Content

[0008] This application provides an extraction device for Phoebe zhennan wood essential oil to solve the problems existing in related technologies. The technical solution is as follows: This application provides an extraction apparatus for Phoebe zhennan wood essential oil, comprising: Extraction tower; A sieve plate assembly is installed inside the extraction tower. A temperature control component is installed inside the extraction tower. The temperature control component controls the temperature inside the extraction tower to decrease from the top to the bottom of the extraction tower. The feed assembly is located inside the extraction tower, above the sieve plate assembly. The Phoebe zhennan extract solution falls onto the sieve plate assembly through the feed assembly.

[0009] In one implementation, The sieve plate assembly includes: Several sieve plates are set on the extraction tower, with the sieve plates spaced apart and staggered. The feeding component sprinkles the dissolved Phoebe zhennan extract onto the uppermost sieve plate. Overflow plate, corresponding to sieve plate, is set on the side of sieve plate away from extraction tower. The Phoebe zhennan extract solution falls from the uppermost sieve plate into the lower sieve plate in sequence.

[0010] In one implementation, The diameter of several sieve plates is smaller than the diameter of the extraction tower.

[0011] In one implementation, The temperature control components include: Several microwave heaters are respectively installed at one end of the corresponding sieve plate near the extraction tower. Several temperature sensors are installed on the extraction tower, and the temperature sensors are located between spaced sieve plates.

[0012] In one implementation, The extraction tower has a discharge port at the top, a coarse material outlet at the bottom, and an air inlet at the bottom.

[0013] In one implementation, it further includes: The inlet pipe is connected to the inlet port, and supercritical carbon dioxide is transported to the extraction tower through the inlet pipe. The discharge pipe has two ends connected to the discharge port and the next stage distillation unit, respectively.

[0014] In one implementation, The sieve plate is evenly distributed with sieve holes, and the shape of the sieve holes is one of the following: through holes, oblique holes, wedge-shaped holes, and inverted trumpet holes.

[0015] In one implementation, Pressure reducing valve, which is installed on the discharge pipe.

[0016] In one implementation, Both the sieve plate and the overflow plate have Teflon partitions.

[0017] In one implementation, The feeding assembly includes: pipeline; The nozzle is connected to the pipeline and is located inside the extraction tower, above the uppermost sieve plate.

[0018] The advantages or beneficial effects of the above technical solutions include at least the following: Supercritical carbon dioxide fluid flows upward from the bottom of the extraction tower. Due to the high pressure of the supercritical carbon dioxide fluid, the sieve plate assembly allows the supercritical carbon dioxide fluid and the extract solution to have sufficient contact, mutual dissolution and extraction opportunities, which can greatly improve the extraction rate. Temperature is controlled by a temperature control component, causing the temperature of the extraction tower to increase sequentially from bottom to top. The main purpose is that as the temperature rises, the molecular motion of the carbon dioxide fluid becomes more vigorous, resulting in better contact and extraction of the extract. At the same time, the increased temperature also increases the pressure, which facilitates more comprehensive contact and dissolution between the extract solution that just enters the extraction tower from the top of the sieve assembly and the supercritical carbon dioxide fluid.

[0019] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0020] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the sieve plate structure. Figure 3 A schematic diagram of the cross-sectional structure of the sieve plate with oblique holes, wedge-shaped holes, and inverted trumpet holes; 100. Extraction tower; 110. Inlet pipe; 120. Outlet pipe; 130. Coarse material outlet; 140. Pressure reducing valve; 200. Screen plate assembly; 210. Screen plate; 220. Overflow plate; 300. Temperature control component; 310. Microwave heater; 320. Temperature sensor; 400. Feed assembly; 410. Pipeline; 420. Nozzle; 500. Distillation apparatus. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0023] Figures 1-3 This diagram shows a structural diagram of an apparatus for extracting Phoebe zhennan essential oil according to an embodiment of this application. Figures 1-3 As shown, the extraction device may include: Extraction tower 100; The sieve plate assembly 200 is disposed inside the extraction tower 100; Temperature control component 300 is installed inside extraction tower 100. Temperature control component 300 controls the temperature inside extraction tower 100 to decrease from the top to the bottom of extraction tower 100. A feed assembly 400 is installed inside the extraction tower 100, above the sieve plate assembly 200. The Phoebe zhennan extract solution is forcefully sprayed through the feed assembly 400 and falls onto the sieve plate assembly 200. Here, the feed assembly 400 is equipped with a pressurization device, ensuring that the Phoebe zhennan extract solution has a certain liquid pressure when sprayed out, but this pressure is much lower than the pressure of supercritical carbon dioxide inside the extraction tower. This liquid pressure allows the extract solution to easily bounce and splash when it touches the uppermost sieve plate, thus increasing contact and extraction efficiency, preventing complete or all of the liquid from directly depositing on the first sieve plate assembly.

[0024] In this embodiment, The extraction tower 100 contains supercritical carbon dioxide from bottom to top, and the feed pressure of the supercritical carbon dioxide fluid is 10-30 MPa, preferably 15-25 MPa.

[0025] A 10% concentration (meaning 10 grams of extract dissolved in 90 grams of 95% alcohol solution by volume) of Phoebe zhennan extract is added to the extraction tower 100 through the feed assembly 400. High-pressure supercritical carbon dioxide fluid flows upwards from the bottom of the extraction tower 100. Due to the high pressure of the supercritical carbon dioxide fluid, the sieve plate assembly 200 ensures sufficient contact, mutual dissolution, and extraction between the supercritical carbon dioxide fluid and the extract solution, significantly improving the extraction rate.

[0026] Temperature is controlled by temperature control component 300, causing the temperature of extraction tower 100 to increase sequentially from bottom to top. The main purpose is that as the temperature increases, the molecular motion of the carbon dioxide fluid becomes more vigorous, resulting in better extraction of the extract. At the same time, the increased temperature also increases the corresponding pressure, which facilitates more comprehensive contact and dissolution between the extract solution that just enters the extraction tower 100 from the top of the sieve assembly and the supercritical carbon dioxide fluid.

[0027] The extract mentioned above refers to Phoebe zhennan extract obtained by alcohol extraction of Phoebe zhennan powder; The parameters involved in the alcohol extraction method include: Temperature: 65-85℃, preferably 70-80℃; The material-to-liquid ratio (golden nanmu powder: 95% volume fraction ethanol) is 1:20-1:40, preferably 1:30; Solvent: 95% ethanol (by volume); Time: 1-3 hours, preferably 2 hours; Number of alcohol extractions: 1-3 times, preferably 2 times. When performing 2 extractions, the material-to-liquid ratio for the second extraction is preferably 1:20 to achieve higher extraction efficiency. Particle size of Phoebe zhennan wood powder: 10-30 mesh; After extraction, the solution is filtered to obtain a filtrate. The filtrate is then concentrated under vacuum to obtain Phoebe zhennan extract.

[0028] Specifically, the feed assembly 400 includes: a pipe 410; and a nozzle 420 connected to the pipe 410. The nozzle 420 is located inside the extraction tower 100, above the uppermost sieve plate 210. A micro-increasing device is installed on the pipe 410 near the nozzle. This micro-increasing device is a conventional increasing device, such as a booster pump. The feed assembly 400 sprays a 10% concentration of Phoebe zhennan extract solution onto the sieve plate assembly 200 through the pipe 410 and the nozzle 420.

[0029] like Figures 1-3 As shown, in one embodiment, The sieve plate assembly 200 includes: Several sieve plates 210 are arranged on the extraction tower 100. The sieve plates 210 are arranged alternately. The feed assembly 400 sprinkles the Phoebe zhennan extract solution onto the uppermost sieve plate 210. Overflow plate 220 corresponds to sieve plate 210. Overflow plate 220 is set on the end side of sieve plate 210 that does not contact extraction tower 100. The golden nanmu extract solution falls from the uppermost sieve plate 210 onto the lower sieve plate 210 in sequence.

[0030] In this embodiment, a 10% concentration of Phoebe zhennan extract solution (dissolved in 95% by volume alcohol) is sprayed from the upper part of the extraction tower 100 in the feed assembly 400. Supercritical carbon dioxide fluid flows upwards from the bottom of the extraction tower 100. Due to the high pressure of the supercritical carbon dioxide fluid, the extract solution above the uppermost sieve plate 210 splashes and bounces onto the sieve plate 210 after spraying, preventing a large amount from flowing directly down through the holes of the first sieve plate 210 (although some solution may flow down through the holes, the flow rate is small). The high pressure of the supercritical carbon dioxide fluid at the bottom acts as a support, causing the sprayed extract solution to accumulate more and more on the first sieve plate 210. Eventually, the liquid level rises above the overflow plate 220 of the sieve plate 210. At this point, the extract solution overflows the overflow plate 220 and flows down through the side guide channel, landing on the second sieve plate 210. Similarly, under the support of the supercritical carbon dioxide fluid, the liquid level on the second sieve plate 210 rises above the overflow plate 220 and then flows into the third sieve plate 210, and so on.

[0031] The above structure and process increase the chances of sufficient contact, miscibility and extraction between supercritical carbon dioxide fluid and extract solution, which can greatly improve the extraction rate.

[0032] Specifically, the diameter of several sieve plates 210 is smaller than the diameter of the extraction tower 100.

[0033] like Figure 1 As shown, in one embodiment, Temperature control component 300 includes: A plurality of microwave heaters 310 are respectively installed on the tower wall at one end of the extraction tower 100 where the corresponding sieve plate 210 is connected. Several temperature sensors 320 are installed on the extraction tower 100, and the temperature sensors 320 are located between spaced sieve plates 210.

[0034] In this embodiment, the microwave heaters 310 in each layer have different heating heat, and their temperatures increase from bottom to top, causing the temperature of each layer to rise sequentially from bottom to top. Specifically, the temperature can increase from 30°C to 90°C, more preferably from 40°C to 85°C. For example, the temperature can be controlled by a trend of 40°C, 50°C, 60°C, 70°C, 80°C, and 90°C, more preferably by a trend of 45°C, 55°C, 65°C, 75°C, and 85°C. The main purpose of this temperature change and control is to make the molecular motion of the carbon dioxide fluid more intense as the temperature rises from bottom to top in the extraction tower, thus improving the extraction of the extract. At the same time, as the temperature rises, the pressure also increases, and the temperature of the extract solution also increases, leading to increased solubility, which is beneficial for more comprehensive contact and dissolution of the extract solution with the supercritical carbon dioxide fluid from top to bottom. Specifically, to enhance the microwave heating effect, two or more microwave heaters 310 and corresponding temperature sensors 320 can be installed in each temperature control section. If two are installed, they are symmetrically arranged on the same plane. If three microwave heaters 310 are installed, one is installed at each of the same heights on the same plane at a 60° angle around the circumference of the extraction tower. Regardless of whether two or three are installed, each sieve plate 210 in each temperature control section must have one microwave heater 310 and one temperature sensor 320 installed to ensure good temperature control, thereby accelerating the movement of molecules in the Phoebe zhennan extract solution directly above each sieve plate 210 and enhancing the extraction effect. Different temperature zones are formed between adjacent sieve plates 210, and the temperature of each temperature zone decreases gradually from top to bottom.

[0035] The microwave heater 310 has a power of 600-1200W. The temperature sensor 320 can be a Pt100 sensor.

[0036] like Figure 1 As shown, in one embodiment, The extraction tower 100 has a discharge port at the top and a coarse material outlet 130 at the bottom. The bottom of the extraction tower 100 also has an air inlet.

[0037] The inlet pipe 110 is connected to the inlet port, and supercritical carbon dioxide is transported to the extraction tower 100 through the inlet pipe 110. The discharge pipe 120 has two ends connected to the discharge port and the next stage distillation unit 500, respectively.

[0038] In this embodiment, since the crude component in the extract solution is more abundant closer to the bottom of the extraction tower 100, this crude component needs to be collected separately from the crude component outlet 130 below, and does not need to be extracted by the carbon dioxide fluid in large quantities. Therefore, the crude component outlet 130 is located at the bottom of the extraction tower 100, and the temperature decreases sequentially from top to bottom.

[0039] The supercritical carbon dioxide fluid discharged from the top outlet of the extraction tower 100, carrying the dissolved product fluid, is transported to the next-stage molecular distillation unit 500. In the next-stage molecular distillation unit 500, the pressure of the supercritical carbon dioxide fluid is reduced, and the product is precipitated and collected. The supercritical carbon dioxide fluid containing dissolved alcohol is continued to be introduced into the next-stage molecular distillation unit 500, where the pressure is further reduced, and the alcohol is precipitated and collected for recycling. The carbon dioxide fluid, due to the pressure dropping below 5 MPa, becomes conventional carbon dioxide gas and is introduced into the supercritical carbon dioxide preparation unit at the bottom of the extraction tower 100 for reuse in the extraction cycle. The air inlet is located at the bottom of the extraction tower 100, and supercritical carbon dioxide is delivered into the extraction tower 100 through the air inlet pipe 110. The discharge pipe 120 reduces the pressure of the generated essential oil product to 8-10 MPa and conveys it to the next stage distillation unit 500 to output the essential oil product. The remaining alcohol and carbon dioxide fluid are further sent to the next stage distillation unit, where the pressure is reduced to 5 MPa again to separate the alcohol and gaseous carbon dioxide. The alcohol is collected for reuse in dissolving the extract.

[0040] like Figure 3 As shown, in one embodiment, The sieve plate is evenly distributed with sieve holes, and the shape of the sieve holes is one of the following: through holes, oblique holes, and inverted trumpet holes.

[0041] In this embodiment, 210 sieve plate thickness: 2-7mm, preferably 4-5mm; Overflow plate 220: 20-40mm, preferably 30mm; The number of through holes on the sieve plate 210 is 60%-90% of the area of ​​the sieve plate 210, and the through holes are evenly distributed. Through-hole diameter: 1-5mm, preferably 2-3mm; By adopting the above design method, the support and dissolution of the extract solution by the supercritical carbon dioxide fluid can be maximized, thereby improving the extraction effect of the entire equipment and saving costs and time.

[0042] The overflow plate 220 on the end side of the sieve plate 210 of this application is detachably mounted on the sieve plate 210. In order to achieve better extraction effect, the width of the overflow plate 220 is set to 2-3 times the thickness of the sieve plate 210, and the top of the overflow plate 220 is set to be wavy or serrated. This allows the material fluid deposited on the sieve plate 210 to flow through the wavy or serrated surface when it reaches the height of the overflow plate 220, thereby increasing the flow path and increasing the contact and miscibility opportunities between the material fluid and the supercritical carbon dioxide fluid, thus improving the extraction efficiency and effect.

[0043] In addition, using the extraction device for Phoebe zhennan essential oil of this application, Examples 1-4 and Comparative Examples 1-2 were set by changing the parameters in the device respectively. The device parameters and extraction test results are shown in Table 1. Table 1. Device parameters and test results As shown in Table 1, the extraction effects of the schemes in Examples 3 and 4 are superior, with a yield of over 10% for Phoebe zhennan essential oil. The other schemes are slightly less effective than Example 2, with yields around 6%-7%, but are still superior to the comparative example of this application. This indicates that the equipment structure of this application, combined with the specific extraction schemes of the embodiments, can effectively improve the yield of Phoebe zhennan essential oil, and achieves high efficiency with short extraction time.

[0044] Note: Separation pressure and temperature refer to the pressure and temperature at which essential oil products are separated in the next stage of distillation.

[0045] The concentration (%) of the Phoebe zhennan extract solution refers to the weight of Phoebe zhennan extract dissolved in each kilogram of alcohol solution. The alcohol used here is 95% ethanol by volume.

[0046] The yield of Phoebe zhennan essential oil is calculated using the following formula: The yield of Phoebe zhennan essential oil = (weight of essential oil / weight of Phoebe zhennan raw material) * 100%.

[0047] Through-hole shape: It can be a circular through-hole, or a through-hole, oblique hole, wedge-shaped hole, or inverted trumpet-shaped hole. The design improvement can increase the extraction path of supercritical carbon dioxide fluid and the contact residence time with the extract solution, so that the extract solution has more sufficient contact with supercritical carbon dioxide and the extraction is more efficient. Besides the wedge-shaped orifice that is wider at the bottom and narrower at the top, it can also be designed as a trumpet-shaped orifice that is wider at the bottom and narrower at the top. Both the wedge-shaped orifice and the trumpet-shaped orifice designs mentioned above can effectively support the material in this application, delay the flow of the material from the holes of the sieve plate 210, enhance the mixing of the material with the supercritical carbon dioxide fluid, and improve the extraction efficiency.

[0048] Specifically, when set as an oblique hole, the diameter of the oblique hole is 1-5mm, and the inclination angle of the oblique hole is 30-75°.

[0049] When set as a wedge-shaped hole that is wider at the bottom and narrower at the top, the diameter of the narrower part of the wedge-shaped hole is 1-3mm, while the diameter of the wider part at the bottom of the wedge-shaped hole is 2-4 times the diameter of the narrower part.

[0050] When the horn hole is set to be wider at the bottom and narrower at the top, the bevel angle of the horn hole is 45-60°.

[0051] By using wedge-shaped or funnel-shaped holes with the aforementioned shape and angle, more supercritical carbon dioxide fluid can be accommodated at the bottom of the hole, allowing the material fluid flowing down from the hole to come into more full contact with the supercritical carbon dioxide fluid, thereby improving extraction efficiency and quality.

[0052] like Figure 1 As shown, in one embodiment, Pressure reducing valve 140 is installed on the discharge pipe 120.

[0053] In this embodiment, the pressure reducing valve 140 can reduce the pressure of the discharge pipe 120. When the discharge pipe 120 outputs gas flow, the pressure reducing valve 140 reduces the pressure to 8-10 MPa for the first time. Simultaneously, the temperature of the distillation apparatus is controlled at 30-90°C, preferably 40-80°C, which facilitates the separation of essential oil products. The remaining alcohol + carbon dioxide fluid is further sent to the next stage of distillation equipment, where the pressure is reduced again to 5 MPa, and the temperature is controlled at 40-80°C, preferably 50-70°C, to facilitate carbon dioxide separation. The alcohol is collected for reuse in dissolving the extract. Gaseous carbon dioxide is sent to the inlet of the supercritical carbon dioxide preparation device for recycling. Therefore, the extraction equipment of this application achieves recycling of both carbon dioxide and alcohol, resulting in clean production and cost savings.

[0054] In one implementation, Both the sieve plate 210 and the overflow plate 220 have Teflon partitions.

[0055] In this embodiment, by providing a Teflon separator on the sieve plate 210 and the overflow plate 220, microwave energy loss of the microwave heater 310 within the extraction tower 100 is avoided. This Teflon separator effectively prevents microwave absorption by the metal sieve plate 210 and the overflow plate 220, reducing microwave energy loss and improving heating efficiency. The thickness of the Teflon separator is 80-300 micrometers, preferably 150-230 micrometers, such as 150, 180, 200, 220, or 250 micrometers.

[0056] like Figure 1 As shown, in one embodiment, Temperature control component 300 also includes: The control panel, temperature sensor 320 and microwave heater 310 are all connected to the control panel.

[0057] In this embodiment, the temperature detected by the temperature sensor 320 of each layer is monitored by the control panel, and the microwave heater 310 of each layer is controlled in a timely manner according to the feedback to ensure that the temperature of the extraction tower 100 decreases from top to bottom. Specifically, the control panel is a common type of control panel on the market, which has a PCB control board inside and can also achieve the above functions through a microcontroller.

[0058] The functions of each module in each device of this utility model embodiment can be found in the corresponding description in the above method, and will not be repeated here.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0061] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An extraction device for Phoebe zhennan wood essential oil, characterized in that, include: Extraction tower; A sieve plate assembly disposed within the extraction tower; A temperature control component is disposed inside the extraction tower, and the temperature control component controls the temperature inside the extraction tower to decrease from the top of the extraction tower to the bottom of the extraction tower; A feed assembly is disposed inside the extraction tower and located above the sieve plate assembly. The Phoebe zhennan extract solution falls onto the sieve plate assembly through the feed assembly.

2. The extraction device for Phoebe zhennan essential oil according to claim 1, characterized in that, The sieve plate assembly includes: A plurality of sieve plates are arranged on the extraction tower, and the plurality of sieve plates are arranged alternately at intervals. The feeding component sprays the Phoebe zhennan extract solution onto the uppermost sieve plate. An overflow plate, which corresponds to the sieve plate, is disposed on the side of the sieve plate away from the extraction tower. The Phoebe zhennan extract solution falls sequentially from the uppermost sieve plate onto the lower sieve plate.

3. The extraction device for Phoebe zhennan essential oil according to claim 2, characterized in that, The diameter of several of the sieve plates is smaller than the diameter of the extraction tower.

4. The extraction apparatus for Phoebe zhennan essential oil according to claim 3, characterized in that, The temperature control component includes: A plurality of microwave heaters are respectively disposed at one end of the corresponding sieve plate near the extraction tower; A plurality of temperature sensors are disposed on the extraction tower, and the plurality of temperature sensors are respectively located between the spaced sieve plates.

5. The extraction apparatus for Phoebe zhennan essential oil according to claim 3, characterized in that, The extraction tower has a discharge port at the top and a coarse material outlet at the bottom, and an air inlet at the bottom.

6. The apparatus for extracting Phoebe zhennan essential oil according to claim 5, characterized in that, Also includes: An air inlet pipe is connected to the air inlet, through which supercritical carbon dioxide is transported to the extraction tower; The discharge pipe has two ends connected to the discharge port and the next stage distillation unit, respectively.

7. The extraction apparatus for Phoebe zhennan essential oil according to claim 5, characterized in that, The sieve plate is evenly distributed with sieve holes, and the shape of the sieve holes is one of the following: through hole, oblique hole, wedge hole, and inverted trumpet hole.

8. The extraction apparatus for Phoebe zhennan essential oil according to claim 6, characterized in that, A pressure reducing valve is installed on the discharge pipe.

9. The extraction apparatus for Phoebe zhennan essential oil according to claim 2, characterized in that, Both the sieve plate and the overflow plate have Teflon separators.

10. The apparatus for extracting Phoebe zhennan essential oil according to claim 2, characterized in that, The feeding assembly includes: pipeline; The nozzle is connected to the pipeline and is located inside the extraction tower, above the uppermost sieve plate.

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