Carbon dioxide (CO2) is a supercritical fluid, meaning it converts into a liquid form when pressurized. At the same time, it is a pure chemical substance that occurs naturally and leaves behind no residues.
Accordingly, the Supercritical CO2 extraction method (aka CO2 extraction) can help ensure cannabis concentrates are pure, making it a good option for patients in search of a natural form of cannabis oil.
Supercritical CO2 Extraction is Safe, Effective
Supercritical CO2 extraction is already a standard extraction method for the food, dry cleaning and herbal supplement industries. In fact, CO2 is used to produce carbonated soft drinks, in the removal of caffeine from coffee beans in order to make decaffeinated coffee, as an environmentally friendly solvent for dry cleaning, and as an extraction solvent when producing essential oils. Supercritical CO2 is also common when pesticides and metals are extracted from agricultural crops.
The CO2 extraction process allows compounds to be extracted with little damage and low toxicity; it utilizes a high pressure vessel containing cannabis. Supercritical CO2 is inserted into the vessel, and pumped through a filter where it is separated from the plant matter once the pressure is released. Next, the supercritical CO2 evaporates and is dissolved into the cannabinoids.
Popular Alternatives To Supercritical CO2 Extraction
Butane extraction is one popular alternative method to CO2 extraction in the cannabis industry. However, James Slatic, CEO of MedWest Distribution, points out that butane can “potentially leave heavy metals behind in the finished product.”
It’s important to note that properly-made BHO is generally considered safe. Of course, product that has not been purged properly may be a completely different story, which is why all concentrates should be lab-tested for safety before being distributed to patients.
“When the solvent (CO2) is pushed through the plant matter at such a high pressure, it can separate the matter precisely, which allows us to isolate only the purest essence.” – James Slatic
Nonetheless, James Slatic, believes that supercritical CO2 extraction offers substantial benefits over the other options available.
“When the solvent (CO2) is pushed through the plant matter at such a high pressure, it can separate the matter precisely, which allows us to isolate only the purest essence,” he explains. Slatic goes on to say that the fact that CO2 is a pure, naturally occurring compound is “its biggest advantage over all other solvents used for plant extraction.”
Another option is Rosin, which uses heat and pressure to create extracts…and this method is so easy it can be done DIY, but results can vary based on temperature and (of course) quality of starting materials. Home-sized Rosin Presses are widely available. Rosin extraction in pure form is “solventless” in that no chemicals are used.