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Liquid CO2 and The Extraction Process
Regarding extracting the CBD oil using this technique, you simply begin with liquid CO2 and raise its pressure via a compressor. You must also raise its temperature using a heater. The next step involves passing the supercritical carbon dioxide through some high-quality cannabis. Now, the CO2 will pull the essential trichomes (the sugary looking coating of the cannabis plant) and terpene oils (essential oils) out of the plant.
The solution gets passed via a separator and is broken down into its requisite parts. The good stuff (including trichomes and terpenes) is sent to the collection container. Meanwhile, the supercritical CO2 goes through a condenser and is turned back into a liquid. Finally, the liquid goes to a special storage tank and can be used to begin the process all over again.
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This form of extraction involves low temperatures and low pressure. Subcritical extractions take longer than their supercritical counterparts and also produce a smaller yield. While it retains the terpenes, essential oils and other sensitive materials, it doesn’t extract larger molecules such as chlorophyll and omega 3 and 6. The benefit of subcritical extraction, however, is that it is less likely to damage terpenes.
Mid-critical is simply a general range between subcritical and supercritical. Some companies combine supercritical and subcritical to create a full-spectrum CO2 cannabis extract. They use the subcritical extraction method to separate the drawn-out oil and draw out the very same plant material using supercritical pressure. The oils are then homogenized into one which creates an amalgamated oil. This is known as the CO2 Total Extraction Process.
Pros and Cons of CO2 Cannabis Extraction
Safety: CO2 is a common food additive and is used to produce things like carbonated soft drinks.
Effectiveness: CO2 has been used as an extraction solvent for years by food companies. It is used to remove caffeine from coffee and as an extraction solvent when producing essential oils.
Purity: The cannabinoids produced are potent and free of chlorophyll with minimal risk of contaminants.
Expensive: You can only complete the process with the aid of extremely expensive equipment.
Technical Ability: CO2 Cannabis extraction is not something that should be attempted by an amateur chemist.
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