Supercritical CO2 extraction of ginger essential oil
The CO2 (carbon dioxide) extraction method of ginger essential oil is usually referred to as the abbreviation of supercritical CO2 extraction.
In short, CO2 extraction is extracted by pressurized carbon dioxide until it becomes a critical point in liquid state. The liquid carbon dioxide then acts as a solvent to obtain natural plant matter and volatile oil content and dissolve the carbon dioxide in the liquid.
Then, the CO2 is brought back to natural pressurization, the carbon dioxide evaporates back to its gaseous state and what remains is the resulting oily substance.
The set of equipment and equipment that uses the “high pressure, low temperature” extraction method shown in the above picture is very complicated and expensive, and its essential oil is labeled “CO2 Extraction”.
This extraction method is carried out in a closed reaction tank in the whole process, and the time required is very short.
200L ginger oil supercritical CO2 extraction equipment configuration
| EXTRACTOR | SEPARATOR | ||
| Volume | 50 L, 4 sets | Volume | Ⅰ 20 L, Ⅱ Ⅲ 17L |
| Max Working Pressure | 400bar | Max. working pressure | Ⅰ 200bar, Ⅱ Ⅲ 180bar |
| CO2 HIGH PRESSURE PUMP | CO-SOLVENT PUMP | ||
| Outlet pressure | 400 bar | Outlet pressure | 400 bars |
| Max. flowrate | 1000L/h | Max. flowrate | 20L/h |
| CO2 STORAGE TANK | PARAMETERS CONTROLLER/ DATALOGGING | ||
| Volume | 100 L | Parameters control | PLC / PC-based software with recipe for automation |
| Working pressure | 85 bar | Screen/Datalogging | 7 inches/Included |
| Other | Shipping | ||
| Power/CO2 | 3 phase/Food grade ≥99.5% | HS code: | 8479200000 |
| Installation | 7800×7000×4500mm | Airport /Port of Lading: | Shanghai |
| Optional | |||
| Max Working Pressure | 500-700bar | Fractionating column | 300par 4-section gradient temperature control |
200L ginger oil supercritical CO2 extraction equipment photo
The advantages of supercritical CO2 extraction of ginger oil:
Compared with the solvent extraction method, this extraction method does not have any solvent residue.
Carbon dioxide extracts usually smell thicker than distilled essential oils, and often smell closer to natural ginger.
Carbon dioxide extract has been said to contain additional components than those extracted from the same plant using steam distillation.
This seems to make sense, because carbon dioxide extracts are usually thicker oils and often seem to have a more comprehensive aroma.
This method is a highly specialized extraction method. Due to the volatilization of the solvent, the ginger essential oil contains no solvent impurities and the separation is relatively thorough.
The extracted molecules can be larger than those extracted by distillation.
There is a situation that needs to be explained. The distillation method uses steam to bring out aromatic molecules, but larger molecules cannot be extracted, such as the diterpene molecules in clary sage. This is already the limit, that is to say 20 It is rarely seen that terpenes with three carbon atoms are extracted by distillation.
Disadvantages of supercritical CO2 extraction method:
Of course, some people questioned that carbon dioxide is an acid gas, so this extraction method will more or less destroy the chemical structure of essential oils.
Although the ginger essential oil extracted in this way will be very close to the original composition of the aromatic substances in the plant, it can be regarded as a quite perfect extraction method. However, the equipment used in this extraction method is not only huge, but also very expensive. Using it to extract ginger essential oil often takes several years to balance the cost.
Until today, the price of ginger essential oil extracted with supercritical carbon dioxide will be more expensive than distillation essential oil.
Supercritical CO2 extraction method PK traditional extraction technology
| Item | Supercritical CO2 extraction | Traditional chemical extraction |
| Extracting agent | Use carbon dioxide fluid extraction to physically extract essential oils and stock solutions without chemical reactions | Organic lysozyme chemical method for extracting essential oils and stock solutions, prone to chemical reactions |
| Activity | The extraction is carried out at close to room temperature and under the envelope of carbon dioxide gas, which effectively prevents the oxidation and escape of heat-sensitive substances, and maintains the purity and active ingredients of the original liquid and essential oil to the greatest extent; the extracted essential oil and the original liquid evaporate quickly, which is not conducive to opening Store. | Can not prevent the oxidation and escape of heat-sensitive substances, so that the extracted liquid and the active ingredients of the essential oil cannot be completely retained, but the extracted essential oil and the liquid are relatively conducive to storage |
| Purity | The extraction and separation are combined into one. When the carbon dioxide fluid saturated with dissolved substances flows through the separator, the pressure drop makes the carbon dioxide and the extracted essential oil and the original liquid quickly produce gas-liquid separation and separate immediately, which not only has high extraction efficiency, but also extracts The purity of essential oils and stock solutions is high; | Use organic lysozyme to extract and then separate. Once a chemical reaction occurs in the extraction process, it is difficult to ensure the purity of the extracted essential oil and the original liquid |
| Safety | Carbon dioxide is a non-flammable gas, tasteless, odorless, non-toxic, and has good safety performance; and the extracted essential oils and original liquids are unlikely to contain residual enzymes, and do not contain nitrates and harmful heavy metals and other harmful solvent residues; | The extraction process is likely to leave nitrates and harmful heavy gold due to chemical reactions, resulting in unqualified essential oils and original liquids, and even damage to the skin |
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