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High-quality supercritical CO2 extraction equipment for cannabis

Introduction of CO2 supercritical extraction of cannabinoids

The CO2 supercritical extraction of cannabinoids uses the special dissolution effect of supercritical CO2 on cannabinoids under pressure and temperature to selectively extract components with different polarity, boiling point, and molecular weight in sequence.

The extract obtained corresponding to each pressure range is not necessarily single, and then the supercritical fluid is turned into an ordinary gas by the method of decompression and temperature rise, and the required cannabinoids are precipitated and purified.

CBD extraction technology

Cannabidiol extraction technology mainly includes solvent immersion method, pressurized solvent extraction method, solvothermal reflux method, supercritical fluid extraction method, ultrasonic assisted extraction method and microwave assisted extraction method.

How to extract CBD oil?

CBD extraction method of solvent impregnation

Solvent impregnation method is currently one of the most researched and applied extraction methods. The solvents used are ethanol, petroleum ether, methanol, dichloromethane and so on.

Under the conditions of 0.5×104kPa, 100°C, and 60min, 19.8mg of cannabidiol can be obtained per gram of dried flowers and leaves, and the extraction rate is 99.3%.

CBD extraction method of supercritical CO2 extraction

The supercritical CO2 extraction method is a clean extraction process.

supercritical co2 fluid extraction equipment for cannabinoids
supercritical co2 fluid extraction equipment for cannabinoids

Method for supercritical CO2 extraction of cannabis

Use CO2 pressure pump and heat exchanger to convert CO2 gas into supercritical CO2 fluid (critical pressure Pc=7.38MPa, critical temperature Tc=31.1℃), and then transport the supercritical CO2 fluid as a solvent to the extraction kettle, and industrial Cannabis flowers and leaves are fully contacted to obtain CBD-containing extracts.

The CO2 flow rate has the greatest impact on the overall yield and recovery rate of key cannabidiol compounds, especially CBD.

CBD extraction method of ultrasonic assisted extraction

Ultrasonic-assisted extraction technology extracts biologically active components from cannabis flowers and leaves, such as polyphenols, flavonoids, and cannabidiol. The three elements of extraction time, output power and methanol concentration are integrated to the main extraction indicators such as total phenols (TPC) and total flavonoids ( TF), antioxidant capacity (FRAP) and the impact of total output.

The concentration of the agent and the extraction time have a significant effect on the results, while the output power has a small effect.

Compared with other traditional extraction methods, the ultrasonic-assisted extraction method has a similar extraction rate, but the ultrasonic-assisted extraction method can significantly increase the extraction volume of cannabidiol compounds.

CBD extraction method of microwave assisted extraction

Use methanol, 95% ethanol, acetonitrile, isopropanol, ethyl acetate and other solvents to extract cannabidiol compounds, and use microwave as an auxiliary extraction method.

Using methanol as the solvent, compared with other methods such as hot reflux extraction (HRE), Soxhlet extraction (SE), supercritical fluid extraction (SFE), ultrasonic extraction (UAE) and microwave assisted extraction (MAE). For the extraction effect, the microwave-assisted extraction method has the largest amount of extraction.

CBD extraction method of solvothermal reflux

The solvothermal reflux method uses organic solvents as extraction solvents to heat and distill the leachate. The volatile solvents are distilled out and then condensed, and then returned to the extractor to continue to participate in the leaching process, cyclically, until the active ingredients are leached completely.

The key technology of cannabidiol extraction in industrial production

Extraction technology

In addition to active ingredients such as flavonoids, polyphenols and cannabidiol compounds, cannabis flowers and leaves also contain a variety of plant proteins, amino acids and plant fibers.
Cannabidiol extraction technology mainly includes solvent immersion method, pressurized solvent extraction method, solvothermal reflux method, supercritical fluid extraction method, ultrasonic assisted extraction method and microwave assisted extraction method.

Separation and purification technology

Cannabidiol is a kind of terpenoid, its chemical structure and chemical properties are very similar, and the hallucinogenic component tetrahydrocannabinol (THC) in the cannabis plant is closest to the nature of cannabidiol. Therefore, separation and purification technology It is especially critical.

At present, the main separation and purification technologies include macroporous resins, molecular distillation and chromatographic columns. However, no matter what kind of separation technology, there are disadvantages such as small processing volume, large equipment investment, and high cost.

Cannabis supercritical CO2 extraction equipment photos

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