This video by extraktLAB's Dr. Jon Thompson debunks ten common arguments claiming ethanol extraction is superior to CO2 extraction for cannabis and botanicals. The presentation challenges perceptions regarding solvent power, run times, throughput, safety, scalability, equipment reliability, and, most notably, cost and solvent residuals.
While acknowledging ethanol's broad solvent power and the need for ethanol in CO2 winterization (though in much smaller amounts), Dr. Thompson argues that CO2's tunable selectivity is more advantageous for separation scientists. He strongly refutes claims of CO2's low throughput, lack of scalability, and safety risks at high pressure, citing large-scale operations and inherent safety features of CO2 equipment compared to flammable solvents. The core of the argument rests on long-term operational costs and the critical issue of solvent residuals. Dr. Thompson contends that CO2 extraction, despite higher initial equipment costs, is significantly cheaper to operate due to vastly lower solvent costs, lower power consumption for solvent recovery, and reduced facility costs (non-flammable environment), leading to faster profitability. Furthermore, he highlights the severe, often overlooked, risks of denaturant residuals in denatured ethanol commonly used due to the high cost of food-grade ethanol, presenting CO2 as the safer option that leaves no such harmful traces.
Debunking the Myths: Why CO2 Extraction Trumps Ethanol
0:10 Introduction: Dr. Jon Thompson from extraktLAB presents and debunks the top 10 reasons often cited for why ethanol extraction is considered better than CO2 extraction.
0:24 The 10 Myths: Lists the common arguments against CO2: low solvent power, long cycle times, low throughput, unsafe high pressure, not scalable, not reliable equipment, needs ethanol for winterization, solvent residuals are no big deal, equipment too costly, and CO2 extraction is too costly.
1:13 Myth #10: Low Solvent Power (Busted): While ethanol has strong solvent power, CO2 offers selectivity tunable via pressure and temperature, which is more crucial for separation. CO2 at 5000 psi/50Β°C can extract 90% cannabinoids in about an hour, which is adequate. Selectivity allows for specific terpene extraction.
3:47 Myth #9: Long Run Times (Busted): This is true for low pressure CO2 runs (4-6 hours), but high pressure/temperature methods significantly shorten run times. Decarbing biomass beforehand also speeds up the process.
5:51 Myth #8: Low Throughput (Busted): Throughput depends on conditions (pressure, temperature, biomass state). ExtraktLAB's systems can process significant volumes (1 ton/day from three small machines, 5 tons/day facility in <4000 sq ft). Throughput should be considered per unit of cost, space, or operating cost.
7:44 Myth #7: Not Safe High Pressure (Busted): Dr. Thompson strongly refutes this, stating he knows of no catastrophic events with CO2 extraction equipment in the industry (unlike fires/explosions with ethanol/butane/propane). While asphyxiation is a risk (managed with alarms/ventilation), high pressure itself isn't inherently unsafe (compares to a 5000 psi pressure washer).
10:24 Myth #6: Not Scalable (Busted): CO2 extraction is absolutely scalable, with many large industrial facilities existing. Scalability is more about modular facility design (like ExtraktLAB's systems) than needing massive vessels. Smaller vessels (40-80L) work efficiently.
12:45 Myth #5: Not Reliable Equipment (Busted): While some older equipment had issues (e.g., with Haskell pumps), manufacturers have improved. Modern CO2 pumps (like diaphragm pumps) are reliable when maintained. Issues might arise from insufficient CO2 supply (small cylinders) rather than the equipment itself. All mechanical systems can have reliability problems, including ethanol pumps.
15:35 Myth #4: CO2 Needs Ethanol for Winterization (Plausible but Misleading): This is true; CO2 extraction often requires ethanol for a post-extraction winterization step to remove waxes. However, the amount of ethanol used is vastly less than in bulk ethanol extraction, minimizing associated costs and concerns (food-grade ethanol can be used).
17:26 Myth #3: Solvent Residuals Are No Big Deal (Busted): This is a major concern, especially with denatured ethanol which contains potentially toxic denaturants (like heptane, acetone) lacking sufficient long-term toxicity data, despite products sometimes passing standard tests. CO2 extraction avoids this risk entirely as CO2 leaves no residuals, making it safer for consumers.
20:13 Myth #2: CO2 Equipment Is Too Costly (Busted): While initial CO2 equipment cost is higher, the operating cost is significantly lower, leading to faster payback and greater long-term value and cash generation for the business.
21:08 Myth #1: CO2 Extraction Is Too Costly (Busted): This is the central debunking point. CO2 uses 4-6x less power, liquid CO2 costs ~117x less per pound than ethanol ($0.04/lb vs $4.71/lb), daily solvent loss costs are dramatically lower ($211/day for CO2 vs $4000-7800+/day for ethanol), startup costs are lower, and facility construction/occupancy costs are much lower for CO2 (F2 vs H2). CO2 offers significantly lower long-term operating costs and higher profitability.
23:04 Conclusion: Recommends CO2 extraction for long-term business value due to lower operating costs. Offers various resources for further information.