Buying Ethanol Call Options to Profit from a Rise in Ethanol Prices

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Ethanol Law Could Lead to Rise in Gas Prices

Compliance costs are skyrocketing this year

A federal law requiring corn ethanol in gas could force prices higher in the near future.

The cost of the law — with requires fuel to contain a certain percentage of corn-based ethanol — has climbed from a mere a few cents last year to $1.10 last Friday, reports The Wall Street Journal.

As the price to earn the ethanol credits goes up, the price of gas will follow. Bill Day, a spokesman for Valero Energy (NYSE:VLO), said, “Eventually that cost is going to get passed along.”

The 2007 law requires that the amount of ethanol used in gasoline increase each year. Last year’s total of 13.2 billion gallons of ethanol used as fuel barely met the required amount. The proposed target amount for this year is 14 billion gallons and that’s producing the spike in prices.

Also complicating matters is the so-called “blend wall”. Any percentage of ethanol in gas above 10% runs the risk of exceeding the tolerance of most engines. With the percentage right at 10% now — American’s used 13.2 billion gallons of ethanol in 133 billion gallons of fuel — any increase in the required amount will exceed engine’s tolerance for ethanol unless more fuel is consumed.

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Your Guide to Ethanol Extraction in Cannabis

Columns – Biology Brief

In part III of a special extraction series, Mark June-Wells examines ethanol’s properties, the different types of extraction strategies, safety considerations for ethanol systems and laboratory infrastructure considerations.

Editor’s Note: This article first appeared in the July 2020 issue of Cannabis Business Times. Mark June-Wells’ extraction series was one of CBT‘s most popular series. Part III, republished here, is the third most-read article in CBT‘s history.

For years, flower was king. As long as there was an established pipeline for flower distribution, it was almost impossible for investors to lose money in the early stages of this industry’s growth. While this might remain true in some markets, flower profits are becoming leaner. There has been a significant decrease in flower price in the most mature markets due to the expansion of outdoor growing techniques that produce high-quality flower in large quantities, as well as market saturation driving prices down.

Let’s create a fiscal example as a starting point. First, let’s assume, for this example, that the price of high-quality outdoor flower is wholesaling at $700 per pound. The second assumption is that two potential outcomes of yield exist from the extraction and refinement process (i.e., 10 percent and 15 percent of dried flower weight). The final assumption is the potential wholesale prices for high-quality refined oils, which we will estimate at two potential levels of $20 and $25 per gram.

At 15-percent extraction yield, an extracted pound would wholesale for $1,360.80 (at $20/g) and $1,701 (at $25/g). At 10-percent extraction yield, the wholesale price for a pound would be $907.20 (at $20/g) and $1,134 (at $25/g).

This example framework is somewhat simplified, but it characterizes the potential for a basic, value-added approach to dealing with the cannabis flower market’s rapidly expanding supply side. (A gram of marijuana flower can retail between $1 to $15, according to data from Leafbuyer.) More revenue can be gained through scale and the manufacturing of extracted products than through flower sales.

In the first two parts of this special three-part extraction series in Cannabis Business Times, we explored supercritical CO2 extraction (March 2020) and hydrocarbon extraction (May 2020); in this column, we will delve into ethanol’s properties, the different types of extraction strategies, safety considerations for ethanol systems and laboratory infrastructure considerations.

What Is Ethanol?

Have you ever drunk grain alcohol? If so, you were drinking ethanol. Ethanol is “a colorless volatile flammable liquid C2H5OH that is the intoxicating agent in liquors and is also used as a solvent and in fuel—called also ethyl alcohol, grain alcohol,” according to Merriam-Webster.

It “can be fermented from many sources of starch, including corn, wheat, grain sorghum, barley, and potatoes, and from sugar crops such as sugar cane and sweet sorghum. Because there has been an abundant supply of corn, most of the ethanol made in the United States is from corn,” the University of Illinois Extension explains.

Ethanol and Its Guidelines

The Food and Drug Administration (FDA) classifies ethanol as a Class 3 solvent with low risk for acute or chronic toxicity in pharmaceutical manufacturing processes where the residual is less than 5,000 ppm or 0.5 percent. The FDA also implies that residual solvents in this category should be limited to 0.5 percent through rigorous quality assurance and quality control programs.

Despite those FDA guidelines, some states have adopted more conservative safety limits suggested by the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH). OSHA and NIOSH set the worker environmental exposure limit for ethanol at 1,000 ppm of Total Weighted Average (TWA) over an eight-hour work shift, which means that some states are allowing only 0.1 percent residual ethanol in extracted products.

The National Fire Protection Association (NFPA), for its part, classifies ethanol as a Class 1 Division 2 Group D flammable liquid. As such, OSHA requires that ethanol vapors be held at 25 percent of the 3.3-percent by volume Lower Explosive Limit (LEL) through adequate ventilation in storage areas. Therefore, areas containing ethanol in production facilities must maintain no more than a 0.83 percent by volume ethanol vapor in the ambient air. (Adequate ventilation—as defined by OSHA and NFPA—is a system capable of cycling a room’s total air volume six times per hour.)

Numerous other considerations apply to the storage and use of ethanol in manufacturing laboratories that could fill a column of their own, so I will simply outline that, when it comes to storage, the maximum flammable cabinet storage is 60 gallons, and the maximum storage permissible outside of a flammable cabinet or storage room is 25 gallons.

The Process

Ethanol extraction is a single-stream process that can be conducted under warm or cold conditions. An example of a warm ethanol extraction processes is the Soxhlet technique. This technique essentially boils ethanol in a flask or pot, then condenses the alcohol on a cooled-coil, which then drips through the packed flower material, stripping the cannabinoids and terpenes during the process. The advantage to this approach is that the extraction is time efficient and of relatively low solvent-to-feed ratio. However, the warm-ethanol technique is generally a small-batch approach that extracts chlorophyll/waxes and decarboxylates the cannabinoids due to the heat involved. (Decarboxylation is the conversion of THCA, for example, to THC through heating and agitation that yields carbon dioxide during the process.) Therefore, heated ethanol extractions might require additional dewaxing and clarification steps.

This type of technique is also limited in the number of products it can produce because all the acid-form cannabinoids are decarboxylated during the extraction. While heating ethanol can increase the extraction process’s efficiency, ethanol is a good solvent for extracting terpenes and cannabinoids. Therefore, it can be used as an extraction solvent at room temperature or under supercooled conditions. Using ethanol at room temperature or under cooled conditions are the most common practices because these conditions allow for the retention of cannabinoid acid forms that can be leveraged to manufacture shatters, THCA crystals or THCA-rich oral formulations.

Know the Difference

A few differences exist between the outcomes of room temperature and supercooled ethanol extractions. First, room-temperature extractions generally extract more waxes and pigments than supercooled techniques, which results in additional dewaxing and clarification steps. However, room-temperature extraction techniques are more efficient. In short, ethanol is a very good solvent as it applies to the extraction of cannabinoids and terpenes. In the literature that describes the solubility of cannabinoids in ethanol, there is no definitive carry capacity, but many sources suggest that cannabinoids are soluble in ethanol at a 1:1 ratio (meaning that 1g of THC is soluble in 1mL of ethanol).

Finally, ethanol extraction can be conducted as expensively or inexpensively as the manufacturer desires. It can be conducted in simple vessels where the ethanol/plant material mixture is agitated by hand or in automated extractors that control temperature, inject a specific ethanol volume and undertake inline dewaxing/clarification.

Solvent Handling

Ultimately, there is always one major problem to address with ethanol extraction beyond the safety requirements: downstream solvent handling.

All types of ethanol extraction require that between 0.6 and 1 gallon of ethanol be used during the extraction process. The reason for this requirement is not due to the solubility of the cannabinoids or terpenes; it is due to the absorbent nature of the plant material. To extract the solutes from the feed material, ethanol must fully saturate the flower or trim. For that reason, a significant volume of ethanol is needed to execute the process with an efficiency rate of more than 90 percent. While some automated machines have built-in processes to minimize the required ethanol volume, the best-case scenario is that the amount of ethanol required ranges from 0.5 gallons to 0.6 gallons per pound.

Machines with automation features have also compensated for the problem of squeezing the ethanol from the plant material by adding spin-of-compression cycles to their processes. This is helpful because recovering all the ethanol from saturated plant material—which holds cannabinoids and terpenes—can be a difficult and messy affair with basic approaches. So, how does one deal with the large amount of ethanol required to extract the cannabinoids from a highly productive cannabis grow? The answer: planning and large solvent-recovery systems.

Scaling for Ethanol Extraction

To help elucidate the laboratory requirements associated with properly scaling ethanol extraction equipment to a grow operation, let’s look at another hypothetical example.

First, let’s assume that the grow is producing 720 pounds of extractable material (i.e., flower/trim) per month. With that information, the extraction system will need to be able to extract a total of 36 pounds of feed material every workday, each month (720 pounds ÷ 20 days). To meet that requirement, the ethanol extraction system will need to process 4.5 pounds per hour of each eight-hour workday. (There are solutions that claim to meet this specification; they often carry a heftier price tag.)

For this example, let’s also assume that we own a supercooled system capable of extracting at the aforementioned rate. That type of machine uses the least amount of ethanol (0.6 gallons/pound) during the process compared to other ethanol extraction technologies. So, the total volume of alcohol to be recovered and processed per day would be 21.6 gallons (36 pounds x 0.6 gallons/pound) or 81.8 liters.

To recover that volume of alcohol, the laboratory would require a large rotary or falling film evaporator (equipment made to gently remove solvents from samples by evaporation). For this example, a rotary evaporator is probably the most cost-effective choice. A large rotary evaporator capable of handling 16 liters/hour would recover the ethanol in about five and a half hours, which means that there would still be room for additional throughput on the extraction side; roughly, 17 pounds of additional feed material throughput per day is feasible under this example.

Ethanol is a solvent capable of extracting cannabinoids and terpenes efficiently. It also has a relatively low boiling point, which makes it easy to remove from final product, and a favorable toxicological profile including FDA limits in the range of 0.5 percent. However, there is a high solvent-to-feed requirement, which can create ethanol storage compliance issues and a need for an expensive, high-throughput rotary evaporator. Finally, ethanol cannot be tailored to separate cannabinoids or terpenes during the extraction phase to work into a predetermined product pipeline. Overall, ethanol extraction is an effective process most suited to high-throughput, bulk-processing laboratories that focus on a few products.

Mark June-Wells, Ph.D., is principal owner of Sativum Consulting Group and a Ph.D. in botany/plant ecology (Rutgers University).

Top photo: rachan ; rgbspace | Adobe Stock

Read Part II, on hydrocarbon extraction, here.

Read Part I, on supercritical extraction, here.

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