Essential oils: Secret and CO2 extraction process

Supercritical carbon dioxide (CO2) fluid extraction is a environmentally friendly and highly efficient extraction technology that produces superior herbal extracts widely used in the food, natural flavoring, fragrance and herbal medicine industries. CO2 extraction can be selective – it can be employed to isolate and remove an undesired compound as in decaffeination, or to concentrate an exciting array of aromatic molecules in volatile form.

What is the most commonly used supercritical fluid extraction?

The main distinction between CO2 extraction and steam distillation is that CO2 is used as the solvent instead of superheated water or steam.

The extraction process begins by pumping pressurized CO2 into a co2 extractor (extraction kettle) with raw plant material.

Why is carbon dioxide used as a supercritical fluid?

The properties of carbon dioxide will change when the temperature is higher than the critical temperature Tc=31.26℃ and the pressure is higher than the critical pressure Pc=72.9atm. Its density is close to liquid, its viscosity is close to gas, and its diffusion coefficient is 100 times that of liquid. It has amazing dissolving power.

Because of the liquid properties of the gas, the CO2 functions as a solvent, pulling the volatiles and other substances such as pigments, waxes and resins from the plant matter.

The CO2 extraction temperature is low, the critical temperature of CO2 is 31.265℃, and the critical pressure is 72.9atm, which can effectively prevent the oxidation, dissipation and reaction of heat-sensitive components, and completely retain the biological activity of biomass objects;

The CO2 supercritical extraction process will, in some cases, produce a superior oil that has not been altered by the high heat associated with steam distillation. In this way, CO2 extracts more closely resemble the plant’s original chemical make-up, and contain a broader spectrum of constituents than is found in their corresponding essential oils.

Why is CO2 extraction better than steam distillation?

In some cases, we recommend the CO2 extract of a botanical due to its extraordinary features. In summary, the supercritical CO2 extraction process for aromatic herbs essential oils yields a wider range of compounds while reducing heat degradation. This method eliminates the need for solvents like hexane, used in the manufacture of absolutes, while providing pure aromatic oils via a kinder, earth-friendly process.


Amaranth Seed Oil

Amaranth seed oil Amaranth seed oil by supercritical co2 extraction is clear yellow oil which is nutrient rich in polyunsaturated fatty acids, plant sterols, tocopherols and squalene. Amaranth seed oil has strong skin nourishing properties and is also a strong… Read more »Amaranth Seed Oil


Coleus Oil

About coleus Coleus forkskohlii belongs to the Lamiaceae – lavender family. Coleus forskohlii is a member of the mint and lavender family (lamiaceae) that has seen centuries of use in Ayurvedic medicine. This species is a perennial herb with fleshy,… Read more »Coleus Oil

Cardamom oil extracted by supercritical CO2

Cardamom essential oil

Cardamom oil Cardamom oil is an essential oil, almost colorless or yellow liquid, with a characteristic spicy and camphor aroma. Insoluble in water, soluble in 70% ethanol.The relative density is 0.919—0.936 (20/20°C), the refractive index is 1.462—1.468, [α]D+22° to +41°,… Read more »Cardamom essential oil

Clove oil extracted by supercritical CO2

Clove essential oil

Clove oil It is the volatile oil obtained by distilling the dried flower buds (syringa) of the Myrtle family plant clove (in ancient times, it was mostly the oil extracted from the mother clove). It is light yellow or colorless… Read more »Clove essential oil

nutmeg oil extracted by supercritical CO2

Nutmeg oil

Nutmeg Essential oil is obtained from the evergreen tree that grows up to 20 meters. The exterior husk of the fruit is dehydrated and used for extracting Mace essential oil, the seeds for the Nutmeg essential oil.

supercritical CO2 extraction of ginger oil

Ginger oil

The ginger oil and oleoresin obtained from supercritical fluid extraction of Zingiber officinale. Solvent free pesticide-tested and certified organic high-grade quality.

It has a special smell and spicy taste. It has the characteristic aroma of ginger.


Fennel oil

Fennel oil is extracted from dry fennel seeds. This is an herb with a long medical reputation believed to convey longevity, courage and strength.

Pure natural black pepper oil extracted by supercritical CO2

Black Pepper Essential Oil

The best black pepper Essential oil is extracted from berries of black pepper by supercritical CO2 fluid and light greenish in appearance.

This oil is free from solvent, pesticide residues and heavy metal traces and therefore is ideal for high quality pharmaceutical, cosmetic, cosmoceutical, nutraceutical formulations and food products.


Cumin/Cumin essential oil

Cumin (Cuminum cyminum) is in the parsley family of essential oils. The oil is obtained through co2 extraction. Cumin is a small, delicate, annual herb more like a ground cover. It grows about 20 inches high and has slender stems, dark green feathery leaves and small pink or white flowers followed by small seeds.