Extraction techniques are used to separate the components of cannabis and remove them from the plant matrix. Various methods can handle cannabis plant material to separate the active ingredients from the undesirables such as fats and waxes. They have two main cannabis extraction methods: solventless and solvent-based techniques.
Solventless: Solventless extraction techniques do not use chemical solvents such as butane, alcohol, or CO2 but instead use a variety of agitation methods as well as machines that use low heat and pressure to break off or melt the cannabinoid trichomes from the cannabis material. Now there are two solventless extraction methods: bubble hash and rosin.
Solvent-based: Solvent-based extraction techniques use a volatile chemical to dissolve the trichomes from the rest of the cannabis plant matter to produce potent cannabis oil. After the separation process, the solvent is removed through a purging process, leaving behind a concentrated final product without the plant material. Three mainstream extraction methods in the market: hydrocarbon extraction, CO2 extraction, and alcohol/ethanol extraction.
This article will help you understand two of these methods of cannabis extraction – CO2 Extraction vs Rosin Press
CO2 Extraction vs. Rosin Press
- No Chemical Residuals: Rosin extraction is a solventless method not use chemical solvents such as butane, and alcohol, this rosin extract is completely clean of residual solvents. CO2 extraction uses CO2 gas as a solvent, the gas will be fully removed, so the CO2 extract same leaves no chemical residuals in the final product.
- Essence and Flavours: Rosin extraction can great at retaining the essence and flavors of the source flower. Because the low heat and high pressure of rosin pressing preserves the flavor, the terpenes, and the potency of extracts.
CO2 Extraction can preserve valued secondary compounds like terpenes and flavonoids. But in terms of terpenes, it is not as comprehensive as rosin.
Rosin gives you the ‘entourage effect”, this is more terpenes in concert together, to give you a deeper and more complete ‘sensation” than CO2 extracts.
- Flavor and freshness: The CO2 extraction method is only viable for dried cannabis and not fresh frozen because it uses temperatures above freezing that would melt the frozen buds, so its flavor and freshness are not as good as rosin.
- Cost: The smallest CO2 extractor can cost thousands of dollars. A small CO2 extraction machine for laboratory use also costs 20,000 to 30,000 US dollars. A rosin press is a very low investment in comparison.
- Extraction scale: As long as you are willing to invest in this point, the scale of the CO2 extraction machine can reach a large number, and the capacity of a single CO2 extraction vessel can be as high as 3000L.
Combined use of CO2 extraction and rosin press to extract cannabis
Rosin presses don’t do very well with trim and the amount of trim from a cannabis plant can be the same, or more, than the weight of the flowers, this means the rosin process, on its own, is an inefficient extraction method; so the rosin process leaves behind a lot of the cannabinoids in the post-pressed “chip” (sometimes referred to as a “wafer” or “puck”).
As often as not, these post-pressed chips get thrown away, fed to the dog, soaked in coconut oil to make an edible base, or soaked in alcohol to make tinctures. None of these post-press products are “capable” or easily “doable”.
Now put a small-scale CO2 extractor in the loop in combination with the rosin press (CO2 extraction is also considered a “solventless” extraction process and leaves zero residues in the extract). For a rosin-only operation that generates a significant amount of chips, when these two processes are combined, the first step can be to “rosin press” while at the same time, the trim from the plant is extracted directly into vape oil by the CO2 extractor. The “icing on the cake” is when the post-pressed, depleted rosin chips are put into the CO2 extractor. The amount and quality of potent, terpy oil recovered is nothing short of amazing. This oil is “capable” right out of the extractor and feeds the fastest-growing segment of the cannabis market.
Conclusion: by using a small-scale CO2 extractor in combination with a rosin press the operator can maximize the economic potential of the cannabis plant.
Works Cited: The 5 Most Common Cannabis Extraction Methods
- Full-Spectrum CO2 vs. Distillate, Which One is Better?
- CO2 oil vs Live Resin: Terpene, Top 4 effects, Compounds
- CO2 and BHO Extraction: Basics, To3 Pros, and Cons
- The Diffs Of Absolute Oil Vs CO2 Extracts Vs Essential Oil
- Unraveling The Properties Of Supercritical CO2: Understanding Viscosity And Density
- CO2 Winterization Equipment for Cannabis/Hemp/CBD Oil
- CO2 Extraction vs Steam Distillation: Top Four Pros and Cons
- Is Co2 Extraction Solventless: Solventless and CO2 Extraction
- Ethanol Extraction vs CO2 Extraction: Top 7 Differences
- Diffs between Supercritical and Subcritical CO2 Extraction
- Supercritical Fluid Extraction: Advantages And Disadvantages
- Top 8 types of supercritical fluid extraction examples