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Subcritical fluid extraction (SFE) uses subcritical fluid as extractant. In a closed, oxygen-free, low-pressure pressure pressure vessel, according to the principle of similar solubility of organic matter, through the molecular diffusion process of extraction material and extractant in the soaking process, the fat soluble components in solid material are transferred to liquid extractant, Finally, a new extraction and separation technology of the target product was obtained. Compared with other separation methods, subcritical fluid extraction has many advantages, such as non-toxic, harmless, environmental protection, non pollution, non thermal processing, non destruction and non oxidation of the active components of the extract, large capacity, large-scale industrial production, energy saving, low operation cost, and easy separation from the product.
Subcritical extraction equipment has been serialized, from the daily processing of raw materials from 1~100 tons of complete equipment has been very mature, 60 tons / day equipment located in Anyang City, Henan Province is the key demonstration plant of the State Economic and Trade Commission, has been in operation for 15 years, processing more than 100,000 tons of raw materials, processing dozens of raw materials
ARA extraction process:
Microbial colony concentration - cold rolling - drying - wall breaking - subcritical biotechnology low-temperature extraction - ARA crude oil - ARA oil refining - finished product packaging
Commonly Seen Extraction Solvent
When extraction solvents such as propane, butane, high purity isobutane (R600a), 1,1,1,2-tetrafluoroethane (R134a), dimethyl ether (DME) are present in a subcritical fluid state, the molecular diffusion properties are enhanced. Those solvents' mass transfer rate is accelerated, and the permeability and solvency for the non-polar, medium-weak, and highly polar substances of the natural products are significantly improved.
The boiling point of the solvent suitable for subcritical extraction is lower than the ambient temperature around us. Generally, the boiling point is below 0ºC, and the liquefaction pressure at 20ºC is below 0.8 MPa (gauge pressure).
The subcritical solvents used in industrial applications are butane and propane initially. Then comes success with dimethyl ether, tetrafluoroethane (R134a), liquid ammonia, sulfur hexafluoride, dichlorodifluoromethane (freon R12), and chlorodifluoromethane (Solvents such as Freon R22). Because of the difference in the polarity of these solvents, they can be used to extract different target products in applications.
subcritical low temperature extraction Flow chart
Common Subcritical Fluids Physical and chemical properties
| Propane | butane | dimthylether | Tetrafluoroethane | Liquid Ammonia | |
| Molecular Formula | C3H8 | C4H10 | CH3OCH3 | CH2FCF3 | NH3 |
| Molecular Weight | 44 | 58 | 102 | 17 | |
| Boiling Point ºC | -42 | -0.5 | -24.9 | -26.2 | -33.4 |
| Pressure Mpa at 20ºC | 0.83 | 0.23 | 0.533 | 0.6 | 0.88 |
| Critical Temp ºC | 95.7 | 152.8 | 129 | 101.1 | 132.3 |
| Critical Pressure MPa | 4.4 | 3.6 | 5.32 | 4.07 | 11.3 |
| Liquid Density: kg/L at 25ºC | 0.49 | 0.57 | 0.66 | 1.2 | 0.61 |
| Gas Density: kg/m 25ºC | 20.15 | 6.18 | 0.6 | ||
| Dielectric Constant | 1.69 | 1.78 | 5.02 | 16.9 | |
| Latent Heat of Vaporization KJ/kg at 30ºC | 329 | 358 | 410 | 216 | 1369 |
| Explosion Limit | 2.3%~9.5% | 1.9%~8.5% | 3.5%~27% | non-inflammable | 16%~25% |
| Toxicity LC50(mg/m3) | minor | minor 680 | 308000 | non-toxic | 1390 |
| Appearance | colorless, odor | colorless, odor | colorless, odor | colorless, odorless | colorless, pungent odor |
Low temperature extraction technology mainly solves the problems of traditional extraction process, such as high temperature, decomposition of extraction solution, more impurities, loss of a large number of effective components, large amount of solvent and high concentration cost;
At the same time, the low-temperature extraction technology changes the original traditional static percolation process into dynamic percolation mode, which speeds up the percolation extraction time and reduces the traditional 8-10 times amount of solvent to 4-5 times.
The low-temperature extraction equipment is applied to the extraction process of various plants, Chinese herbal medicines, fruits, animal drugs and food additives at room temperature.
Low temperature extraction equipment is suitable for normal pressure and normal temperature extraction, Soxhlet extraction, dynamic thermal reflux extraction, plant essential oil extraction and vacuum concentration of extraction solution in traditional Chinese medicine, health products, biopharmaceutical, cosmetics, food and other industries.
The invariability of water-soluble protein was more than 95%, residual oil was less than 1%, and residual solubility was less than 50ppm; Low temperature extraction technology mainly solves the problems of traditional extraction process, such as high temperature, decomposition of extraction solution, more impurities, loss of a large number of effective components, large amount of solvent and high concentration cost;
Low temperature extraction equipment will be used in the production of precious oil "liquefied petroleum gas extraction technology"
This principle of avocado oil extraction machine utilizes sub-critical solvent for the first extraction process that is known as counter-current extraction. The process involves treating of pretreated seeds with propane and butane, which are classified as liquefied sub critical solvents. The end product from extractor are extracted oil meal and mixture fluid. The mixture fluid yields to gassified solvent as a result of solvent gasification whereby the fluid is subjected to vacuum evaporation at normal temperature. A fresh recycling session is done after the gasified solvent is condensed or liquefied. The basis of utilizing the sub-critical low temperature extraction technology of our avocado oil extraction machine is that the boiling point of these solvent is below 0°C. When under low temperature and normal pressure condition, the soluble fatty acids and other active components within the raw material and solvents has the propriety of dissolvability. That is how this low temperature extraction machinery get the target products. The processes in this method are achieved with normal temperature and pressures, avoiding damages to the thermal sensitivity of final oils. Our latest prickly pear seed oil extraction machine and moringa seed oil extraction machine also adopts this efficient low temperature extraction method.
| Animal fat oil extraction methods | Pros | Cons |
| Pressing |
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| Cooking | simple and small investment extraction equipment |
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| Traditional Solvent disllation extraction |
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| Supercritical Extraction |
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| Sub-critical Biological Extraction |
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The advantages of subcritical low temperature extraction technology are as follows:
1. The quality of the extracted cake is good and the original heat sensitive substances are not destroyed, which can further develop plant protein;
2. The solvent consumption is low, and the solvent consumption per ton of raw material is less than 8 kg;
3. No steam is needed, only 90 ºC hot water is enough. Compared with No. 6 solvent, 70% of thermal energy can be saved;
4. There is no "three wastes pollution" in production, which belongs to environmental protection engineering.
5. Extraction at room temperature, desolvation at low temperature (less than 40 ºC), no damage of heat sensitive substances in oil and meal after extraction, high yield of pigment in extract, bright color, it is an ideal process for extraction of precious oil, plant protein and natural pigment;
6. Small investment and low production cost (compared with CO2 equipment);
7. Subcritical fluid has a wide range of sources and low price. This solvent is available in all oilfields and refineries, and its price is lower than that of No. 6 solvent;
8. Low pressure and high safety (working pressure 0.3mpa-1.0mpa);
9. The production scale is large, and the processing capacity of a complete set of extraction equipment can reach 0.1t-200t/d.
Low temperature extraction technology mainly solves the problems of traditional extraction process, such as high temperature, decomposition of extraction solution, more impurities, loss of a large number of effective components, large amount of solvent and high concentration cost;
At the same time, the low-temperature extraction technology changes the original traditional static percolation process into dynamic percolation mode, which speeds up the percolation extraction time and reduces the traditional 8-10 times amount of solvent to 4-5 times.
The low-temperature extraction equipment is applied to the extraction process of various plants, Chinese herbal medicines, fruits, animal drugs and food additives at room temperature.
Low temperature extraction equipment is suitable for normal pressure and normal temperature extraction, Soxhlet extraction, dynamic thermal reflux extraction, plant essential oil extraction and vacuum concentration of extraction solution in traditional Chinese medicine, health products, biopharmaceutical, cosmetics, food and other industries.
The invariability of water-soluble protein was more than 95%, residual oil was less than 1%, and residual solubility was less than 50ppm; Low temperature extraction technology mainly solves the problems of traditional extraction process, such as high temperature, decomposition of extraction solution, more impurities, loss of a large number of effective components, large amount of solvent and high concentration cost;
Low temperature extraction equipment will be used in the production of precious oil "liquefied petroleum gas extraction technology"
This principle of avocado oil extraction machine utilizes sub-critical solvent for the first extraction process that is known as counter-current extraction. The process involves treating of pretreated seeds with propane and butane, which are classified as liquefied sub critical solvents. The end product from extractor are extracted oil meal and mixture fluid. The mixture fluid yields to gassified solvent as a result of solvent gasification whereby the fluid is subjected to vacuum evaporation at normal temperature. A fresh recycling session is done after the gasified solvent is condensed or liquefied. The basis of utilizing the sub-critical low temperature extraction technology of our avocado oil extraction machine is that the boiling point of these solvent is below 0°C. When under low temperature and normal pressure condition, the soluble fatty acids and other active components within the raw material and solvents has the propriety of dissolvability. That is how this low temperature extraction machinery get the target products. The processes in this method are achieved with normal temperature and pressures, avoiding damages to the thermal sensitivity of final oils. Our latest prickly pear seed oil extraction machine and moringa seed oil extraction machine also adopts this efficient low temperature extraction method.
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Model
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Capacity
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Hot water generator power
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Material
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Heating Area of Extraction Tank
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Condensing Area of Condenser
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Vacuum pump power
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UEM-10
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10L
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6KW
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SUS304/316
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0.21M2
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0.22 M2
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0.55KW
|
|
UEM-20
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20L
|
8.8KW
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0.28 M2
|
0.5 M2
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0.55KW
|
|
|
UEM-30
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30L
|
10KW
|
0.33 M2
|
0.72 M2
|
1.5 KW
|
|
|
UEM-50
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50L
|
12KW
|
0.5 M2
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0.83 M2
|
3KW
|
|
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UEM-100
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100L
|
24KW
|
0.98 M2
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0.95 M2
|
4KW
|
|
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UEM-150
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150L
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25KW
|
1.45 M2
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1.2 M2
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4KW
|
|
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UEM-200
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200L
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27KW
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1.85 M2
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1.5 M2
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6.5 KW
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|
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UEM-300
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300L
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35KW
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2.85 M2
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2.3 M2
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8KW
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1. Q : How can customer know the processes of order?
A : We will take photo or video during manufacturing every two weeks to make customer clear about the order. When goods is finished,we will take more detailed photos or video for inspect. You can also come to our factory to inspect by yourself.
2. Q : Do you supply installation equipment in oversea?
A : Yes, if need, we can also send our installation engineer to your factory to help you do installation and testing. And you need to provides round-trip ticket and accommodation for our engineer. The extra salary of one installation engineer is 200USD/day.
3. Q : How to control quality?
A : All material we use has material certification. Before any piece of equipment leaves
Gaokang. It goes through a complete quality and assurance control inspection. This inspection assures your equipment meets all specifications and is in proper working order before it leaves our facility and arrives at your door.
4. Q : What is the shipment schedule?
A : We will send you photographs of your order being loaded into the shipping container at the factory. The shipping container will generally leave port 3-4 days after loading. We will send you a bill of lading and final statement of account within one week of that time. The bill of lading will include the shipping container numbers. You can track your shipping container. Approximately 10 days prior to delivery, we will send you an ETA (Estimated Time of Arrival) notice from the shipping time. Please remember that the listed delivery date is only an estimate, and is subject to port unloading schedules, customs processing, and the dictates of the local delivery truck company. You will be directly contacted by the shipping company's local truck delivery services approximately 48 hours prior to the date of delivery to schedule a delivery time. If you need to delay the final delivery, there will be a "pull" fee of approximately $100, and a storage fee of approximately $150 per shipping container per day.
GAOK design and manufacture extraction prodcution line for users in need of a simple device for small amounts of extract, as well as more complex equipment for industrial use. Our offer includes preprocess(dryer /grinder) ,coating machine ,package machine and process systems where the substance used as solvent is either a volatile hydrocarbon (butane extraction), an alcohol (alcohol extraction), or CO2 (supercritical extraction). Given the investment cost, complexity of use, and extract quality, each system has some advantages and disadvantages.
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