Equipment and method for extracting pure natural garlic oil by using acetone
By using an extraction method combining acetone and ethyl acetate, the problem of loss of cyclic sulfur compounds in traditional processes was solved, achieving stable extraction of highly bioactive components from garlic oil and improving the quality and extraction rate of garlic oil.
Patent Information
- Application Number
- CN202511558296.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2025-12-09
AI Technical Summary
In traditional garlic oil extraction processes, highly bioactive cyclic sulfur compounds are lost, leading to a reduction in anti-tumor effects.
Using acetone as a solvent, garlic oil was extracted through homogenization, filtration, vacuum concentration, and extraction. Ethyl acetate extraction and pH adjustment were combined to inhibit alliinase activity and ensure the stability of cyclic sulfur compounds.
It effectively preserves the highly bioactive components in garlic oil, improves the stability and extraction rate of allicin extract, reduces the reaction involving water molecules, and improves the quality of garlic oil.
Smart Images
Figure CN121086833A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of compound extraction, and more specifically, to an apparatus and method for extracting pure natural garlic oil using acetone. Background Technology
[0002] Garlic oil is an essence extracted from fresh garlic. Its main active ingredient is allicin and various sulfide compounds derived from it.
[0003] Traditional steam distillation or supercritical fluid extraction methods for garlic oil do not contain the cyclic sulfur compound allicin B1. Cyclic molecules, due to their more compact molecular arrangement, generally have higher melting and boiling points than straight-chain molecules with the same number of carbon atoms, and are also more stable. Animal experiments have shown that cyclic sulfur compounds are the main reason for the anti-tumor effect of allicin. Traditional processes result in the loss of highly bioactive cyclic sulfur compounds, especially allicin B1. Summary of the Invention
[0004] This invention provides an apparatus and method for extracting pure natural garlic oil using acetone, solving the technical problem of loss of highly bioactive cyclic sulfur compounds caused by traditional processes in related technologies.
[0005] This invention provides a method for extracting pure natural garlic oil using acetone, comprising the following steps: S1: The processed garlic is clean garlic, which is garlic without skin, damage, and pesticide residue; S2: The processed garlic and acetone are homogenized using a homogenizer to ensure thorough mixing. The mixture is stirred regularly to obtain a homogenized garlic paste. S3: The garlic homogenate from S2 is passed through a filtration and separation unit to remove garlic residue, and the acetone recovery liquid is stored in a buffer tank. The residue also needs to be rinsed with acetone; S4: Transfer the acetone recovery liquid in the buffer tank to the first vacuum concentration unit, and use a vacuum pump to reduce the pressure from standard atmospheric pressure to remove the acetone from the acetone recovery liquid; S5: Transfer the acetone recovery liquid obtained in S4 after removing acetone to the extraction unit, add ethyl acetate, stir and mix thoroughly to obtain the extraction recovery liquid, and adjust the pH of the aqueous phase to weak acid before extraction after standing at room temperature to inhibit alliinase activity. At this time, the interface between the two phases is clear. After complete separation, remove the aqueous layer, collect the remaining part of the extraction recovery liquid, and transfer this part of the extraction recovery liquid to the second vacuum concentration unit. S6: Use a vacuum pump to reduce the pressure from standard atmospheric pressure, and completely remove the ethyl acetate from the extract after removing the water layer to obtain garlic oil.
[0006] Furthermore, in S2, the weight ratio of processed garlic to acetone is 1:0.5-1:3.0.
[0007] Further, in S5, ethyl acetate is added for extraction, with a volume ratio of 2:1.
[0008] The present invention also proposes an apparatus for extracting pure natural garlic oil using acetone, comprising: a raw material pretreatment unit, a homogenization and mixing unit, a filtration and separation unit, a first vacuum concentration unit, a solvent recovery unit, an extraction and separation unit, and a second vacuum concentration unit; The raw material pretreatment unit conveys materials to the homogenizing and mixing unit. The homogenizing and mixing unit inputs the homogenized garlic slurry into the filtration and separation unit. The filtrate outlet of the filtration and separation unit is directly connected to the first vacuum concentration unit. The concentrate after treatment by the first vacuum concentration unit is transported to the extraction and separation unit through a pipeline. The organic phase outlet of the extraction and separation unit is connected to the second vacuum concentration unit. The second vacuum concentration unit removes the solvent to obtain pure garlic oil. The solvent recovery unit is connected in parallel with each unit that generates waste solvent, including the first vacuum concentration unit, the extraction and separation unit, and the second vacuum concentration unit. Waste acetone and waste ethyl acetate generated by each unit are collected through pipelines.
[0009] Furthermore, the raw material pretreatment unit includes a garlic washing machine, a peeling machine, a testing platform, and a temporary storage hopper. The garlic washing machine, peeling machine, testing platform, and temporary storage hopper are connected in series via a conveyor belt. After the garlic is washed, it is processed by the peeling machine and then inspected for quality on the testing platform. Qualified raw materials enter the temporary storage hopper. The discharge valve at the bottom of the temporary storage hopper is directly connected to the feed inlet of the homogenization and mixing unit through a conveying pipe.
[0010] Furthermore, the homogenization and mixing unit includes a high-speed homogenizer, an acetone storage tank, a metering pump, a centrifugal pump, and a buffer tank. The high-speed homogenizer receives garlic from the raw material pretreatment unit through a top feed inlet. At the same time, the high-speed homogenizer has an acetone feed inlet on its side, which is connected to the acetone storage tank through a polytetrafluoroethylene-lined pipe. The metering pump precisely controls the amount of acetone added, so that the garlic and acetone are mixed in a weight ratio. The mixture is then transported to the buffer tank by the centrifugal pump and then enters the filtration and separation unit.
[0011] Furthermore, the filtration and separation unit includes a filter press, an acetone storage tank, a washing rack, and a spray rack. The acetone recovery liquid is collected through the bottom outlet of the filter press, while the filter cake is processed through the washing rack above. The acetone storage tank washes the filter cake through multiple spray racks. The washing liquid and the main filtrate are combined and then enter the next processing unit together.
[0012] Furthermore, the first vacuum concentration unit includes an evaporator, a two-stage vacuum pump, a serpentine condenser, and a solvent recovery tank. The top of the evaporator is connected to the two-stage vacuum pump, which maintains the vacuum level. The acetone vapor generated by evaporation is condensed by the serpentine condenser and then enters the solvent recovery tank. The concentrated material is transported from the bottom of the evaporator to the extraction and separation unit through a pipeline.
[0013] Furthermore, the extraction and separation unit includes an extraction tank, an ethyl acetate storage tank, and a pH adjuster storage tank. The top of the extraction tank is connected to the feed pipe of the ethyl acetate storage tank. The pH adjuster storage tank injects pH adjuster through a peristaltic pump to adjust the pH value. The organic phase flows into the second vacuum concentration unit by gravity, and the aqueous phase is treated as waste liquid.
[0014] Furthermore, the second vacuum concentration unit includes an evaporation flask, a serpentine condenser, and a product collector. The evaporation flask is connected to the serpentine condenser, and the bottom of the serpentine condenser is connected to the product collector.
[0015] The beneficial effects of this invention are as follows: This invention extracts garlic oil using acetone. Acetone can greatly prolong the lifespan of allyl and allyl thiosulfinic acids in garlic oil. Moreover, the polar environment of acetone can slow down the spontaneous condensation reaction of these sulfides. Acetone can also slow down the formation of allicin into DADS / DATS, greatly improving the bioactivity of allicin extract. Furthermore, acetone is a low-water solvent. Although it is a hydrophilic solvent, its polar environment is not conducive to the free existence of water molecules, thereby reducing reactions involving water molecules. The mixture obtained by the acetone extraction method is rich in other effective sulfur-containing compounds. Attached Figure Description
[0016] Figure 1 This is a flowchart of a method for extracting pure natural garlic oil using acetone, as proposed in this invention; Figure 2 This is a schematic diagram of the device for extracting pure natural garlic oil using acetone, as proposed in this invention. Figure 3 This is a radar chart comparing the extraction effects of garlic oil in Examples 1, 2, and 3 of this invention; Figure 4 This is a bar chart showing the garlic oil extraction rate in the material ratio of an apparatus for extracting pure natural garlic oil using acetone, as described in this invention. Detailed Implementation
[0017] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.
[0018] Example 1 like Figure 1 As shown, a method for extracting pure natural garlic oil using acetone includes the following steps: S1: The processed garlic is clean garlic, which is garlic without skin, damage, and pesticide residue.
[0019] The moisture content of garlic is between 65% and 70%. It should be stored at 4-8℃ and pre-treated within 2 hours before use. Garlic slices should be 2-3mm thick to increase the contact area. S2: Homogenization and mixing process. 30 kg of cleaned garlic and acetone are homogenized and mixed using a homogenizer to ensure thorough mixing. The mixture is stirred regularly to obtain a homogenized garlic paste.
[0020] The mixture consisted of 30 kg of cleaned garlic and 30 kg of acetone in a 1:1 weight ratio. Citric acid solution was added to adjust the pH to 6.2 ± 0.2. The homogenization conditions were as follows: rotation speed of 2000-2500 rpm, temperature of 18-22℃ (controlled by circulating cooling water), 20 minutes per cycle, twice daily at 6-hour intervals, and a shear rate of 8000-12000 s. -1 Stir; S3: Filtration and separation. The garlic homogenate from S2 is filtered to remove garlic residue, and the acetone recovery liquid is stored in a buffer tank.
[0021] The sample is coarsely filtered through a 200-mesh stainless steel screen, then finely filtered through a plate and frame filter press. The filter residue is washed with 4L of acetone to improve solute recovery. Approximately 46L of acetone extract is stored in a buffer tank. S4: First vacuum concentration: The acetone recovery liquid in the buffer tank is transferred to the first vacuum concentration unit. The pressure is reduced from standard atmospheric pressure using a vacuum pump, and the temperature is controlled below 50°C to remove acetone from the acetone recovery liquid.
[0022] It should be noted that the first vacuum concentration unit is a thin-film evaporator, and the operating conditions are as follows: vacuum degree between -0.075±0.005MPa, evaporation temperature between 38-42℃ (optimized temperature range), concentration endpoint is a concentrated liquid volume of about 2-3L, acetone recovery rate ≥96%, purity ≥99.5%; S5: Extraction and separation. The acetone recovery liquid obtained in S4 after removing acetone is transferred to the extraction unit. Ethyl acetate is added and the mixture is stirred thoroughly to obtain the extraction recovery liquid. The mixture is allowed to stand at room temperature. Before extraction, the pH of the aqueous phase is adjusted to inhibit alliinase activity. At this time, the interface between the two phases is clear. After complete separation, the aqueous layer is removed, the remaining part of the extraction recovery liquid is collected, and this part of the extraction recovery liquid is transferred to the second vacuum concentration unit.
[0023] It should be noted that the pH fine-tuning was performed by adjusting the pH of the aqueous phase to 5.2±0.2, using 50 mL of 0.1 M citric acid and sodium citrate buffer and 5.0 L of ethyl acetate (volume ratio 2:1). The extraction conditions were as follows: temperature between 22-25℃, stirring speed of 200-300 rpm, standing for 18 min for layer separation, clear layer interface, complete layer separation, and approximately 2.5 L of wastewater collected from the aqueous phase, with COD ≤ 500 mg / L. S6: Second vacuum concentration, the pressure is reduced from standard atmospheric pressure to -0.1MPa using a vacuum pump, and the temperature is controlled below 50℃. After completely removing the ethyl acetate from the extract after removing the water layer, garlic oil is obtained.
[0024] The equipment used for the second vacuum concentration was a rotary evaporator, with the following operating conditions: vacuum level between -0.095 ± 0.005 MPa, evaporation temperature between 42 and 46°C. The concentration endpoint was determined as follows: refractive index: n 20 =1.565±0.010, yielding 165-185g of garlic oil; Example 2 like Figure 1 As shown, a method for extracting pure natural garlic oil using acetone includes the following steps: S1: The processed garlic is clean garlic, which is garlic without skin, damage, and pesticide residue.
[0025] The garlic has a water content of 60% to 65%. It is pretreated with liquid nitrogen for 30 seconds, cell walls are broken by ultrasound, and it is blanched in 85°C hot water for 30 seconds and then rapidly cooled. S2: Enhanced homogenization and mixing process. The cleaned garlic and acetone are homogenized and mixed using a homogenizer to ensure thorough mixing. The mixture is stirred regularly to obtain a homogenized garlic paste.
[0026] The mixture consists of 30 kg of cleaned garlic and 60 kg of acetone (weight ratio 1:2), with 1.5 L of anhydrous ethanol added (to improve the solubility of polar components). The pH is adjusted to 6.5 ± 0.1. The homogenization conditions are as follows: rotation speed 2800-3200 rpm, temperature 15-18℃, 30 min per cycle, 3 times a day, 4 hours apart, and ultrasonic-assisted mixing. S3: Multi-stage filtration and separation. The garlic homogenate from S2 is filtered to remove garlic residue, and the acetone recovery liquid is stored in a buffer tank.
[0027] The filter was first filtered through a 100-mesh sieve, then second filtered through a plate and frame filter press, and then third filtered through a precision filter. The filter residue was washed with acetone, and 6L of an acetone-ethanol mixture (9:1) was used for rinsing. The rinsing was done with ultrasonic assistance, and about 58L of extract was collected. S4: Enhance the first vacuum concentration by transferring the acetone recovery liquid in the buffer tank to the first vacuum concentration unit. Use a vacuum pump to reduce the pressure from standard atmospheric pressure and control the temperature below 50°C to remove acetone from the acetone recovery liquid.
[0028] The first vacuum concentration was achieved using a falling film evaporator and a distillation column, with the following operating conditions: vacuum level between -0.085±0.003MPa, evaporation temperature between 35-38℃, and the concentration endpoint as follows: concentrated liquid volume approximately 1.5~2L, solvent recovery rate ≥98%, purity ≥99.8%. S5: Dual extraction separation. The acetone recovery liquid obtained in S4 after removing acetone is transferred to the extraction unit. Ethyl acetate is added and the mixture is stirred thoroughly to obtain the extraction recovery liquid. The mixture is allowed to stand at room temperature. Before extraction, the pH of the aqueous phase is adjusted to inhibit alliinase activity. At this time, the interface between the two phases is clear. After complete separation, the aqueous layer is removed, the remaining part of the extraction recovery liquid is collected, and this part of the extraction recovery liquid is transferred to the second vacuum concentration unit.
[0029] The pH of the first extraction was adjusted to between 5.0 and 0.1, the extractant was 4 L of ethyl acetate (volume ratio 2:1), the temperature was between 20 and 22℃, the extraction time was 12 min, and then it was allowed to stand for 15 min. Second extraction: The aqueous phase was re-extracted with 2L of ethyl acetate for 8 minutes, and then allowed to stand for 10 minutes. S6: Enhance the second vacuum concentration by using a vacuum pump to reduce the pressure from standard atmospheric pressure to -0.1 MPa and control the temperature below 50°C. After completely removing the ethyl acetate from the extract after removing the water layer, garlic oil is obtained.
[0030] The second vacuum concentration was performed using a short-path molecular distillation apparatus under the following operating conditions: vacuum level between -0.098±0.002MPa, evaporation temperature between 40-43℃. Further purification was achieved by molecular distillation to remove high-boiling-point impurities, yielding 195-225g of garlic oil.
[0031] Example 3 like Figure 1 As shown, a method for extracting pure natural garlic oil using acetone includes the following steps: S1: Green pre-treated garlic is clean garlic, which is garlic without skin, damage, or pesticide residue.
[0032] The garlic has a moisture content of 70% to 75%. It is washed with 0.5 mg / L ozone water, air-dried, and then mechanically crushed. S2: Energy-saving homogenization and mixing process. The cleaned garlic and acetone are homogenized by a homogenizer to ensure thorough mixing. The mixture is stirred regularly to obtain a homogenized garlic paste.
[0033] The mixture consists of 30 kg of cleaned garlic and 42 kg of acetone (weight ratio 1:1.5). Recycled acetone (purity ≥99%) is used, and natural citric acid is used to adjust the pH to 6.0. The homogenization conditions are as follows: rotation speed 1800-2200 rpm, temperature 20-25℃, 25 min per cycle, twice a day, with an 8-hour interval. S3: High-efficiency filtration and recovery. The garlic homogenate from S2 is passed through a filtration device to remove garlic residue, and the acetone recovery liquid is stored in a buffer tank.
[0034] The mixture is filtered through a filter press, and the filter residue is washed with acetone. 5L of acetone is recovered and sprayed to obtain garlic cellulose (byproduct). S4: First vacuum concentration: The acetone recovery liquid in the buffer tank is transferred to the first vacuum concentration unit. The pressure is reduced from standard atmospheric pressure using a vacuum pump, and the temperature is controlled below 50°C to remove acetone from the acetone recovery liquid.
[0035] The first vacuum concentration equipment is an evaporator, and the operating conditions are as follows: vacuum degree between -0.070±0.005MPa, evaporation temperature between 40-45℃; S5: Extraction and separation. The acetone recovery liquid obtained in S4 after removing acetone is transferred to the extraction unit. Ethyl acetate is added and the mixture is stirred thoroughly to obtain the extraction recovery liquid. The mixture is allowed to stand at room temperature. Before extraction, the pH of the aqueous phase is adjusted to inhibit alliinase activity. At this time, the interface between the two phases is clear. After complete separation, the aqueous layer is removed, the remaining part of the extraction recovery liquid is collected, and this part of the extraction recovery liquid is transferred to the second vacuum concentration unit.
[0036] The extractant used was 3.5L (volume ratio 2:1) of ethyl acetate, which was microwave-assisted, and the amount of wastewater was reduced. The aqueous phase was recycled and reused for cleaning after treatment. S6: Second vacuum concentration, the pressure is reduced from standard atmospheric pressure to -0.1MPa using a vacuum pump, and the temperature is controlled below 50℃. After completely removing the ethyl acetate from the extract after removing the water layer, garlic oil is obtained.
[0037] The second vacuum concentration equipment is an evaporator, and the operating conditions are as follows: vacuum degree between -0.090±0.005MPa, evaporation temperature between 45-48℃, nitrogen purging and drying to obtain 150-180g of garlic oil; Examples 1, 2, and 3 above were comprehensively evaluated from six aspects: extraction rate, product quality, cost control, environmental friendliness, ease of operation, and solvent recovery rate. Figure 3 As shown in the comparison diagram of the implementation examples, the gray solid marks represent Example 3, the black solid marks represent Example 2, and the white hollow marks represent Example 1. Example 3 is the optimal solution. like Figure 4 As shown, it should also be noted that the extraction rate is optimal when the ratio of garlic to acetone in the material ratio is 1:1.5. Based on the extraction method described above, such as Figure 2 As shown, a device for extracting pure natural garlic oil using acetone is also provided. It adopts a modular continuous production design. Taking Example 3 as an example, the entire device starts from the pretreatment of raw materials, and after the orderly connection of the main functional units, it finally produces high-quality garlic oil products.
[0038] The starting point of the equipment is the raw material pretreatment unit, which includes a garlic washing machine, a peeling machine, a testing table, and a temporary storage hopper. The equipment is connected in series through a conveyor belt system. After the garlic is washed, it is processed by the peeling machine and then manually inspected on the testing table. Qualified raw materials enter the temporary storage hopper. The discharge valve at the bottom of the hopper is directly connected to the feed port of the homogenizer in the next unit through a stainless steel 304 conveying pipe.
[0039] The homogenizing unit is the core of the equipment. A high-speed homogenizer receives garlic from the raw material pretreatment unit through a top inlet, and has an acetone inlet on the side connected to an acetone storage tank via a PTFE-lined pipe. A metering pump precisely controls the amount of acetone added, ensuring the garlic and acetone are mixed at a specific weight ratio. The homogenizer is equipped with a high-shear homogenizing head and a mechanical seal system. Jacket cooling maintains the temperature below 25°C, and an explosion-proof motor and nitrogen protection system ensure safe operation. The processed mixture is discharged from the bottom outlet of the homogenizer and pumped to a buffer tank by a centrifugal pump before entering the filtration and separation unit.
[0040] The filtration and separation unit uses a filter press as the main equipment. The filtrate is collected through the bottom outlet of the filter press, while the filter cake is processed through the upper washing rack. The acetone storage tank washes the filter cake through a multi-point spray rack. The washing liquid and the main filtrate are then combined and sent to the next processing unit. The filtrate outlet of the filter press is connected to the evaporator of the first vacuum concentration unit through a DN50 stainless steel 316L pipe.
[0041] The first vacuum concentration unit is centered around an evaporator. The top of the evaporator is connected to a vacuum system, which maintains a certain vacuum level through a two-stage vacuum pump to ensure concentration under low-temperature conditions.
[0042] The acetone vapor generated by evaporation is condensed by a serpentine condenser and then enters the solvent recovery tank, achieving an acetone recovery rate of over 95%. The concentrated material is then transported from the bottom of the evaporator to the extraction and separation unit through a DN32 stainless steel 316L insulated pipeline.
[0043] The extraction tank of the extraction and separation unit is designed with a transparent viewing window and a paddle agitator. The top of the tank is connected to the feed pipe of the ethyl acetate storage tank, and an online pH meter and pH adjuster metering system are installed on the side. The pH adjuster storage tank precisely adjusts the pH value to the range of 5.0-5.5 via a peristaltic pump. During the extraction process, the agitator ensures full contact between the two phases. After extraction, the material enters the gravity separation system, where an interface detector automatically identifies the separation interface. The organic phase and the aqueous phase are discharged from different outlets. The organic phase flows into the second vacuum concentration unit by gravity through glass or PTFE pipes, while the aqueous phase is treated as waste liquid.
[0044] The second vacuum concentration unit performs the final concentration. The evaporation flask is connected to a serpentine condenser via a standard ground glass joint, and a product collector is connected to the bottom of the condenser. The vacuum system is connected to a vacuum pump via a cold trap device to maintain the vacuum level and remove the ethyl acetate solvent under controlled temperature conditions.
[0045] The evaporated ethyl acetate is condensed and then enters the solvent recovery system to finally obtain 140g to 200g of pure garlic oil product per batch. The residual ethyl acetate content needs to be controlled to be below 50mg per kilogram.
[0046] The solvent recovery unit, a crucial component of the entire system, achieves efficient solvent recovery through a DN200 diameter, 2000mm high distillation column. The column is packed with stainless steel wire mesh, providing the separation effect equivalent to 10 theoretical trays. Waste solvents from various units are collected via pipelines to the feed inlet in the middle of the distillation column. A reboiler at the bottom provides heat, while a condenser at the top condenses and recovers the pure solvent. A reflux system ensures effective separation. The recovered acetone and ethyl acetate are stored in their respective tanks for reuse in the production process.
[0047] It should be noted that the equipment's control system adopts a PLC centralized control method. The temperature, pressure, flow, liquid level and pH value sensors of each unit are connected to the control cabinet through signal lines, and the operator monitors the entire production process through a touch screen human-machine interface.
[0048] The entire equipment is laid out linearly according to the process flow, with each unit connected by a stainless steel piping system. Material pipes are made of 316L stainless steel with electropolished inner walls, solvent pipes are lined with PTFE for corrosion protection, and vacuum pipes are made of 304 stainless steel with insulation. This not only ensures the continuity and stability of the production process but also achieves efficient solvent recovery and utilization, reducing production costs while meeting safety and environmental protection requirements, enabling the stable production of high-quality, pure natural garlic oil.
[0049] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.
Claims
1. A method for extracting pure natural garlic oil using acetone, characterized in that, Includes the following steps: S1: The processed garlic is clean garlic, which is garlic without skin, damage, and pesticide residue; S2: The processed garlic and acetone are homogenized using a homogenizer to ensure thorough mixing. The mixture is stirred regularly to obtain a homogenized garlic paste. S3: The garlic homogenate from S2 is passed through a filtration and separation unit to remove garlic residue, and the acetone recovery liquid is stored in a buffer tank. The residue also needs to be rinsed with acetone; S4: Transfer the acetone recovery liquid in the buffer tank to the first vacuum concentration unit, and use a vacuum pump to reduce the pressure from standard atmospheric pressure to remove the acetone from the acetone recovery liquid; S5: Transfer the acetone recovery liquid obtained in S4 after removing acetone to the extraction unit, add ethyl acetate, stir and mix thoroughly to obtain the extraction recovery liquid, and adjust the pH of the aqueous phase to weak acid before extraction after standing at room temperature to inhibit alliinase activity. At this time, the interface between the two phases is clear. After complete separation, remove the aqueous layer, collect the remaining part of the extraction recovery liquid, and transfer this part of the extraction recovery liquid to the second vacuum concentration unit. S6: Use a vacuum pump to reduce the pressure from standard atmospheric pressure, and completely remove the ethyl acetate from the extract after removing the water layer to obtain garlic oil.
2. The method for extracting pure natural garlic oil using acetone according to claim 1, characterized in that, In S2, the weight ratio of processed garlic to acetone is 1:0.5-1:3.
0.
3. The method for extracting pure natural garlic oil using acetone according to claim 1, characterized in that, In S5, ethyl acetate is added for extraction, with a volume ratio of 2:
1.
4. An apparatus for extracting pure natural garlic oil using acetone, for performing the steps of a method for extracting pure natural garlic oil using acetone as described in any one of claims 1-3, characterized in that, include: The unit comprises a raw material pretreatment unit, a homogenization and mixing unit, a filtration and separation unit, a first vacuum concentration unit, a solvent recovery unit, an extraction and separation unit, and a second vacuum concentration unit. The raw material pretreatment unit conveys materials to the homogenizing and mixing unit. The homogenizing and mixing unit inputs the homogenized garlic slurry into the filtration and separation unit. The filtrate outlet of the filtration and separation unit is directly connected to the first vacuum concentration unit. The concentrate after treatment by the first vacuum concentration unit is transported to the extraction and separation unit through a pipeline. The organic phase outlet of the extraction and separation unit is connected to the second vacuum concentration unit. The second vacuum concentration unit removes the solvent to obtain pure garlic oil. The solvent recovery unit is connected in parallel with each unit that generates waste solvent, including the first vacuum concentration unit, the extraction and separation unit, and the second vacuum concentration unit. Waste acetone and waste ethyl acetate generated by each unit are collected through pipelines.
5. The apparatus for extracting pure natural garlic oil using acetone according to claim 4, characterized in that, The raw material pretreatment unit includes a garlic washing machine, a peeling machine, a testing platform, and a temporary storage hopper. The garlic washing machine, peeling machine, testing platform, and temporary storage hopper are connected in series by a conveyor belt. After the garlic is washed, it is processed by the peeling machine and then inspected for quality on the testing platform. Qualified raw materials enter the temporary storage hopper. The discharge valve at the bottom of the temporary storage hopper is directly connected to the feed port of the homogenization and mixing unit through a conveying pipe.
6. The apparatus for extracting pure natural garlic oil using acetone according to claim 5, characterized in that, The homogenization and mixing unit includes a high-speed homogenizer, an acetone storage tank, a metering pump, a centrifugal pump, and a buffer tank. The high-speed homogenizer receives garlic from the raw material pretreatment unit through a top feed inlet. At the same time, the high-speed homogenizer has an acetone feed inlet on its side, which is connected to the acetone storage tank through a polytetrafluoroethylene-lined pipe. The metering pump precisely controls the amount of acetone added, so that the garlic and acetone are mixed in a weight ratio. The mixture is then transported to the buffer tank by the centrifugal pump and then enters the filtration and separation unit.
7. The apparatus for extracting pure natural garlic oil using acetone according to claim 6, characterized in that, The filtration and separation unit includes a filter press, an acetone storage tank, a washing rack, and a spray rack. The acetone recovery liquid is collected through the bottom outlet of the filter press, while the filter cake is processed through the washing rack above. The acetone storage tank washes the filter cake through multiple spray racks. The washing liquid and the main filtrate are combined and then enter the next processing unit together.
8. The apparatus for extracting pure natural garlic oil using acetone according to claim 7, characterized in that, The first vacuum concentration unit includes an evaporator, a two-stage vacuum pump, a serpentine condenser, and a solvent recovery tank. The top of the evaporator is connected to the two-stage vacuum pump, which maintains the vacuum level. The acetone vapor generated by evaporation is condensed by the serpentine condenser and then enters the solvent recovery tank. The concentrated material is transported from the bottom of the evaporator to the extraction and separation unit through a pipeline.
9. The apparatus for extracting pure natural garlic oil using acetone according to claim 8, characterized in that, The extraction and separation unit includes an extraction tank, an ethyl acetate storage tank, and a pH adjuster storage tank. The top of the extraction tank is connected to the feed pipe of the ethyl acetate storage tank. The pH adjuster storage tank is injected with pH adjuster through a peristaltic pump to adjust the pH value. The organic phase flows into the second vacuum concentration unit by gravity, and the aqueous phase is treated as waste liquid.
10. The apparatus for extracting pure natural garlic oil using acetone according to claim 9, characterized in that, The second vacuum concentration unit includes an evaporation flask, a serpentine condenser, and a product collector. The evaporation flask is connected to the serpentine condenser, and the bottom of the serpentine condenser is connected to the product collector.