Jasmine flower essential oil extraction device and extraction method

Abstract

The application discloses a jasmine essential oil extraction device and an extraction method, and belongs to the technical field of essential oil extraction. The device comprises a drying chamber, a heat pump dryer, an adsorption tank, a separation tank and a carbon dioxide device. An adsorbent is arranged in the adsorption tank. The carbon dioxide device is connected with the adsorption tank and provides supercritical carbon dioxide fluid. The adsorption tank is connected with the separation tank. The heat pump dryer comprises a first condenser and a first evaporator. The drying chamber is connected with the adsorption tank through the first evaporator. The first condenser is arranged in the drying chamber. The drying chamber is connected with a first fan. The application reduces the use amount of the adsorbent in the adsorption tank, reduces the production cost, and recycles the condensed water. The application obtains the head fragrance oil without water and smog in the shortest time. The jasmine flowers can be normally dried after the essential oil is extracted. The dried jasmine flowers still have fragrance and have a longer storage time.

Description

Technical Field

[0001] This invention belongs to the field of essential oil extraction technology, specifically relating to a jasmine essential oil extraction device and extraction method. Background Technology

[0002] Among the methods for extracting jasmine essential oil, there are commonly "solvent extraction," "distillation extraction," "adsorption," and "supercritical CO2 fluid extraction." GC and GC / MS analyses of essential oil samples prepared by different methods show significant differences in the quantity and content of aroma components. Furthermore, sensory evaluation results indicate that the essential oils obtained by solvent extraction and distillation extraction have strong aromas, but the aroma of the solvent-extracted oil is somewhat turbid, while the aroma of the distillation-extracted oil has a musty, watery quality. In contrast, the top-note essential oil obtained by adsorption has an elegant and pure aroma, most similar to the fragrance of fresh jasmine flowers. The flower itself cannot be reused after extraction by solvent extraction and distillation extraction. Adsorption requires a large amount of adsorbent due to the high water content. While supercritical CO2 fluid extraction of jasmine flowers offers advantages such as high yield and high product quality, the high solubility of supercritical CO2 fluid also extracts non-essential oil components from the jasmine flowers, such as proteins, making the product prone to mold growth during storage and limiting its application range. Summary of the Invention

[0003] In view of the above-mentioned problems in the prior art, the technical problem to be solved by the present invention is to provide a jasmine essential oil extraction device and extraction method, which improves the essential oil extraction effect, and the jasmine flowers after essential oil extraction can be utilized.

[0004] Technical Solution: To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A jasmine essential oil extraction device includes a drying chamber for holding jasmine flowers, a heat pump dryer connected to the drying chamber, an adsorption tank connected to the heat pump dryer, a separation tank connected to the adsorption tank, and a carbon dioxide device connected to the separation tank. The adsorption tank contains an adsorbent, and the carbon dioxide device is connected to the adsorption tank and provides supercritical carbon dioxide fluid. The adsorption tank is connected to the separation tank through a first heat exchanger. The heat pump dryer includes a first condenser and a first evaporator. The drying chamber is connected to the adsorption tank through the first evaporator. The first condenser is disposed in the drying chamber for heating the drying chamber. The drying chamber is connected to a first fan.

[0006] Furthermore, the first evaporator is connected to a water collection tank.

[0007] Furthermore, the adsorption tank is connected to the spray tower, and the air adsorbed by the adsorbent enters the spray tower. The water collection tank is also connected to the spray tower.

[0008] Furthermore, the spray tower is connected to the drying chamber via a second fan.

[0009] Furthermore, the spray tower is equipped with spray nozzles, the water collection tank is connected to the spray nozzles via a spray pump, and the spray tower is connected to the water collection tank via a circulation pipe.

[0010] Furthermore, the carbon dioxide device includes a gas tank connected to the separation tank, a liquefier connected to the gas tank, a pressurizing pump connected to the liquefier, and a second heat exchanger connected to the pressurizing pump, the second heat exchanger being connected to the adsorption tank.

[0011] Furthermore, both the first fan and the second fan are connected to the first condenser.

[0012] This invention also provides a method for extracting jasmine essential oil, using the aforementioned jasmine essential oil extraction apparatus, comprising the following steps:

[0013] Step 1: Place the jasmine flowers in the drying chamber, and the heat pump dryer heats the drying chamber.

[0014] Step 2: The dried indoor air enters the adsorption tank after passing through the first evaporator. The moisture in the air condenses at the first evaporator to form condensate, which then enters the water collection tank.

[0015] Step 3: The adsorbent in the adsorption tank adsorbs the jasmine fragrance from the air;

[0016] Step 4: The adsorbed air enters the spray tower and comes into full contact with the condensate in the water collection tank to form humid air with a humidity of 80%-98%.

[0017] Step 5: Humid air is introduced into the drying chamber for a period of time T1. During the time T1, the temperature in the drying chamber is controlled at D1.

[0018] Step 6: After time T1, the second fan stops working, and the drying chamber continues to be heated by the first condenser for another time T2. During time T2, the humidity in the drying chamber is controlled at S1.

[0019] Step 7, Extraction: The supercritical carbon dioxide fluid provided by the carbon dioxide unit enters the adsorption tank for supercritical carbon dioxide extraction.

[0020] Step 8: The extracted supercritical carbon dioxide fluid enters the separation tank through the first heat exchanger.

[0021] Step 9: Jasmine essential oil is released from the separator, and the decomposed carbon dioxide gas is returned to the carbon dioxide device.

[0022] Furthermore, in step 5, 5 hours ≤ T1 ≤ 10 hours, 40℃ ≤ D1 ≤ 55℃; in step 6, 2 hours ≤ T2 ≤ 6 hours, 20% ≤ S1 ≤ 30%.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0024] 1. By setting up a drying chamber, adsorption tank, separation tank and carbon dioxide device, the advantages of adsorption method and supercritical carbon dioxide extraction method are combined to obtain top fragrance essential oil with elegant and pure aroma.

[0025] 2. The first evaporator of the heat pump dryer can condense the moisture in the air containing jasmine essential oil, reducing the amount of adsorbent used in the adsorption tank. The resulting product has a low water content, which reduces production costs. The condensed water can be further recycled.

[0026] 3. The first condenser of the heat pump dryer is located in the drying chamber to heat the drying chamber, and together with the first evaporator, it can recover the heat from the air discharged from the drying chamber, thereby reducing energy consumption;

[0027] 4. The air adsorbed by the adsorbent enters the spray tower, where it can further absorb the remaining aroma. The spray tower is connected to the water collection tank, which can use the condensate in the water collection tank to circulate and absorb the remaining aroma. The recovery effect is good and the water consumption is low.

[0028] 5. The humid air discharged from the spray tower can enter the drying chamber and, together with the first condenser, promote the volatilization of jasmine essential oil at a higher temperature. This effectively increases the volatilization rate of the essential oil and the resulting essential oil does not have the musty smell of water from distilled essential oil.

[0029] 6. Extraction Method: First, use the humid air discharged from the spray tower to induce the jasmine flowers to expel moisture, and obtain the top fragrance essential oil without water or stuffiness in the shortest time. With the protection of humid air, the jasmine flowers will not be over-dried. After a certain period of time, stop the flow of humid air and control the humidity in the drying room. This allows the jasmine flowers to be dried normally after the essential oil is extracted. After drying, the jasmine flowers still have fragrance and can be stored for a longer time.

[0030] 7. During the collection of top-scent essential oils, air circulates between the drying chamber, adsorption tank, and spray tower, resulting in a small amount of external air being introduced and high essential oil recovery efficiency. Moisture in the air and moisture in the jasmine cells circulates between the drying chamber, water collection tank, and spray tower, resulting in a small amount of external moisture being introduced. Overall, the amount of condensate that needs to be recovered is small, and it contains more jasmine fragrance substances, making the condensate recovery value high. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the jasmine essential oil extraction device according to an embodiment of the present invention. Detailed Implementation

[0032] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0033] like Figure 1 As shown, a jasmine essential oil extraction device includes a drying chamber 1, a heat pump dryer, an adsorption tank 3, a separation tank 4, a carbon dioxide device, a water collection tank 6, and a spray tower 7. The drying chamber 1 is used to place jasmine flowers to be processed. The drying chamber 1 is connected to a first fan 11. The inlet end of the first fan 11 is connected to a filter 12, which can filter dust and moisture in the air. The heat pump dryer includes a first condenser 21 and a first evaporator 22. A throttling valve, a compressor, and other heat pump components are also provided between the first condenser 21 and the first evaporator 22. The refrigerant flows between the first condenser 21 and the first evaporator 22. The first condenser 21 is located inside the drying chamber 1, and the first evaporator 22 is located outside the drying chamber 1. The first fan 11 is connected to the first condenser 21 through a first air inlet pipe. A first opening valve is provided on the first air inlet pipe to control the air intake. The first condenser 21 heats the air entering the drying chamber 1.

[0034] The drying chamber 1 is connected to the first evaporator 22 via the first air outlet duct. Air containing jasmine fragrance passes through the first evaporator 22. The outer wall of the first evaporator 22 has a low temperature and exchanges heat with the air, causing the air containing jasmine fragrance to cool down and the moisture in the air to condense. The first evaporator 22 is connected to the water collection tank 6 via the condensate pipe, and the condensed water enters the water collection tank 6. The first evaporator 22 is connected to the adsorption tank 3 via the air duct, and the air containing jasmine fragrance enters the adsorption tank 3. The adsorption tank 3 contains an adsorbent. In this embodiment, activated carbon is selected as the adsorbent, and multiple layers of adsorbent are arranged in the adsorption tank 3.

[0035] The adsorption tank 3 is connected to the bottom of the spray tower 7 via a duct. The air adsorbed by the adsorbent enters the spray tower 7. The spray tower 7 is equipped with nozzles 71. The water collection tank 6 is connected to the nozzles 71 via a spray pump 61. The water mist sprayed from the nozzles 71 fully contacts the air entering from the bottom of the spray tower 7, which can further recover the remaining jasmine fragrance in the air. The spray tower 7 is connected to the water collection tank 6 via a circulation pipe 72, so that the condensate in the water collection tank 6 can be circulated to recover the jasmine fragrance. The top of the spray tower 7 is connected to the drying chamber 1 via a return air pipe. A second fan 13 is installed on the return air pipe to transport the humid air with high humidity back to the drying chamber 1. The spray tower 7 is also equipped with a bypass pipe, through which the humid air can be directly discharged to the external environment. The outlet end of the second fan 13 is connected to the first condenser 21, which can heat the return air. A second opening valve is installed on the return air pipe to control the return air volume.

[0036] Adsorption tank 3 is connected to separation tank 4 via a first heat exchanger 91. A pressure reducing valve is also installed on the connecting pipeline between adsorption tank 3 and separation tank 4. Separation tank 4 is connected to a carbon dioxide unit, which includes a gas tank 51, a liquefier 52, a pressurizing pump 53, and a second heat exchanger 54. Separation tank 4 is connected to gas tank 51, which stores carbon dioxide gas. Gas tank 51 is also connected to liquefier 52, which uses an existing ammonia-cooled liquefier to convert carbon dioxide gas into liquid. Liquefier 52 is connected to pressurizing pump 53. The pressure pump 53 is connected to the second heat exchanger 54. The carbon dioxide liquid is pressurized by the pressure pump 53 and heat exchanged with the second heat exchanger 54 to reach a supercritical state. The second heat exchanger 54 is connected to the adsorption tank 3. The supercritical carbon dioxide fluid extracts the adsorbent. After the carbon dioxide fluid extracts the essential oil, it is depressurized and heat exchanged with the first heat exchanger 91 before entering the separation tank 4 to decompose the essential oil. The separation tank 4 is connected to the essential oil pipe 41. The decomposed essential oil is discharged through the essential oil pipe 41, and the decomposed carbon dioxide gas enters the gas tank 51 to participate in the recycling.

[0037] This embodiment also provides a method for extracting jasmine essential oil, using the aforementioned jasmine essential oil extraction apparatus, including the following steps:

[0038] Step 1: Place the jasmine flowers into drying chamber 1, and heat the drying chamber 1 with a heat pump dryer;

[0039] After the jasmine flowers are harvested and washed, they are placed in material trays. The jasmine flowers are laid flat on the material trays, and the bottom of the trays is equipped with meshes of appropriate size and mesh count. The material trays are placed in multiple layers on a support, and the entire support is placed in the drying chamber 1.

[0040] Step 2: The air in the drying chamber 1 passes through the first evaporator 22 and enters the adsorption tank 3. The moisture in the air condenses at the first evaporator 22 to form condensate, which enters the water collection tank 6.

[0041] The reduced moisture content in the air results in less water adsorption by the subsequent adsorbent, and the condensate in the water collection tank 6 can be recycled.

[0042] Step 3: The adsorbent in adsorption tank 3 adsorbs the jasmine fragrance from the air;

[0043] Step 4: The adsorbed air enters the spray tower 7 and comes into full contact with the condensate in the water collection tank 6 to form humid air with a humidity of 80%-98%.

[0044] The condensate can not only further recover residual fragrances from the air, but also fully humidify the air.

[0045] Step 5: Humid air is introduced into drying chamber 1. The time for humid air to be introduced into drying chamber 1 is T1, where 5 hours ≤ T1 ≤ 10 hours. In this embodiment, T1 = 6 hours. During the 6 hours, the temperature inside drying chamber 1 is controlled at D1, where 40℃ ≤ D1 ≤ 55℃. In this embodiment, D1 = 50℃.

[0046] The first fan 11 and the second fan 13 regulate the air volume through the opening valves on their respective pipelines, thereby controlling the humidity in the drying chamber 1. In this step of extracting the top notes with humid air, the jasmine flowers release a strong fragrance and the aromatic oils evaporate rapidly. The higher temperature and humid air are highly efficient at extracting the fragrance, and the extraction time is short. The obtained top note essential oil has an elegant and pure aroma, and there is no problem of the essential oil containing water and smelling stuffy due to excessively high temperature water vapor in the distillation method. At the same time, due to the protection of humid air, the jasmine flowers in the drying chamber 1 will not be over-dried.

[0047] Step 6: After 6 hours, the second fan 13 stops working, and the drying chamber 1 continues to be heated by the first condenser 21 for another T2 time. 2 hours ≤ T2 ≤ 6 hours. In this embodiment, T2 = 2 hours. Within 2 hours, the humidity in the drying chamber 1 is controlled at S1, 20% ≤ S1 ≤ 30%. In this embodiment, S1 = 20%.

[0048] In this step, the first fan 11 introduces external dry air and heats the air to dry the jasmine flowers. The dried jasmine flowers retain a certain fragrance and can be used. The dried jasmine flowers have a longer shelf life. The air during drying also absorbs the fragrance through the adsorption tank 3, and the air discharged from the spray tower 7 is directly discharged to the external environment through the bypass pipe.

[0049] Step 7, Extraction: The supercritical carbon dioxide fluid provided by the carbon dioxide unit enters the adsorption tank 3 for supercritical carbon dioxide extraction.

[0050] After the jasmine flowers are dried, they can be extracted, with an extraction time of 1-3 hours.

[0051] Step 8: The extracted supercritical carbon dioxide fluid enters the separation tank 4 through the first heat exchanger 91.

[0052] The carbon dioxide fluid containing essential oils, after being depressurized and heated, is analyzed in separator 4.

[0053] Step 9: Jasmine essential oil is released from separator 4, and the decomposed carbon dioxide gas returns to the carbon dioxide device;

[0054] Essential oil is released from the essential oil tube 41, and the carbon dioxide gas can be recycled.

[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A jasmine essential oil extraction device, characterized in that, The device includes a drying chamber (1) for holding jasmine flowers, a heat pump dryer connected to the drying chamber (1), an adsorption tank (3) connected to the heat pump dryer, a separation tank (4) connected to the adsorption tank (3), and a carbon dioxide device connected to the separation tank (4). The adsorption tank (3) contains an adsorbent, and the carbon dioxide device is connected to the adsorption tank (3) and provides supercritical carbon dioxide fluid. The adsorption tank (3) is connected to the separation tank (4) via a first heat exchanger (91). The heat pump dryer includes a first condenser (21) and a first evaporator (22). The drying chamber (1) is connected to the separation tank (4) via the first evaporator (91). 22) Connected to the adsorption tank (3), the first condenser (21) is set in the drying chamber (1) for heating the drying chamber (1), the drying chamber (1) is connected to the first fan (11), the first evaporator (22) is connected to the water collection tank (6), the adsorption tank (3) is connected to the spray tower (7), the air adsorbed by the adsorbent enters the spray tower (7), the water collection tank (6) is connected to the spray tower (7), the spray tower (7) is connected to the drying chamber (1) through the second fan (13), the first fan (11) and the second fan (13) are both connected to the first condenser (21).

2. The jasmine essential oil extraction apparatus according to claim 1, characterized in that, The spray tower (7) is equipped with a nozzle (71), and the water collection tank (6) is connected to the nozzle (71) through a spray pump (61). The spray tower (7) is connected to the water collection tank (6) through a circulation pipe (72).

3. The jasmine essential oil extraction apparatus according to claim 1, characterized in that, The carbon dioxide device includes a gas tank (51) connected to the separation tank (4), a liquefier (52) connected to the gas tank (51), a pressurizing pump (53) connected to the liquefier (52), and a second heat exchanger (54) connected to the pressurizing pump (53), the second heat exchanger (54) being connected to the adsorption tank (3).

4. A method for extracting jasmine essential oil, using the jasmine essential oil extraction apparatus as described in any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Place the jasmine flowers into the drying chamber (1), and heat the drying chamber (1) with a heat pump dryer; Step 2: The air in the drying chamber (1) passes through the first evaporator (22) and enters the adsorption tank (3). The moisture in the air condenses at the first evaporator (22) to form condensate and enters the water collection tank (6). Step 3: The adsorbent in the adsorption tank (3) adsorbs the jasmine fragrance in the air; Step 4: The adsorbed air enters the spray tower (7), where it comes into full contact with the condensate in the water collection tank (6) to form humid air with a humidity of 80%-98%. Step 5: Humid air is introduced into the drying chamber (1) for a period of time T1. During the time T1, the temperature inside the drying chamber (1) is controlled at D1. Step 6: After time T1, the second fan (13) stops working, and the drying chamber (1) is continuously heated by the first condenser (21) for another time T2. During time T2, the humidity in the drying chamber (1) is controlled at S1. Step 7, Extraction: The supercritical carbon dioxide fluid provided by the carbon dioxide device enters the adsorption tank (3) for supercritical carbon dioxide extraction. Step 8: The extracted supercritical carbon dioxide fluid enters the separation tank (4) through the first heat exchanger (91); Step 9: Jasmine essential oil is released from the separation tank (4), and the decomposed carbon dioxide gas is returned to the carbon dioxide device.

5. The method for extracting jasmine essential oil according to claim 4, characterized in that, In step 5, 5 hours ≤ T1 ≤ 10 hours, 40℃ ≤ D1 ≤ 55℃; in step 6, 2 hours ≤ T2 ≤ 6 hours, 20% ≤ S1 ≤ 30%.

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