How to Make High Quality CBD Distillate
Distillation is a science that has been used for thousands of years, but it’s now known as the final gateway to creating some of the purest forms of hemp and cannabis products. Extracting, isolating, separating, and distilling pure cannabinoids are among the top trends in the world of cannabis production.
Equipment and techniques for creating these pure products have developed almost exponentially within recent years. From potent THC distillate vapor pens to CBD tinctures, the distillation process is a key step in creating some of the most desired products in the industry.
The steps before distillation
Before we walk through the distillation process, we need to look at the steps that get us to CBD oils that can be distilled. In order to get those desired cannabinoids, they first need to be extracted from the plant.
The extraction of hemp or cannabis typically involves the following steps:
- Drying the hemp or cannabis to 5-15 percent water content.
- Shucking the flower from the stems.
- Grinding of the flower to 2-300 microns to enable more efficient extraction.
- Decarboxylating or removing carbon dioxide from the cannabinoids to make them neutral and activating the cannabinoids.
- Collecting of terpenes for later use in formulation.
- Supercritical CO2 extraction .
- Winterization and filtration of the extracts to remove waxes and fats from the extract.
- Removing any ethanol solvent from the winterized oil using a thin film distillation apparatus.
Once these steps have been accomplished, then the winterized CBD oil is ready for distillation.
What is CBD distillate?
Very simply, distillation is the separation of molecules through selective boiling and condensation. An example of this is practiced in the world of alcohol distilleries. In order to create a higher alcohol content in spirits like vodka or whiskey, a distillery needs to use distillation to separate other materials from alcohol. But how is it done?
Alcohol has a lower boiling point than water and is therefore more volatile, causing it to evaporate at a lower boiling point. Because of this, a distillery can use a set temperature (roughly 173 degrees Fahrenheit) to boil off the alcohol in a solution causing it to evaporate. After evaporation, the alcohol will collect in a chilled condensation column where it will be more potent and free of water and other unwanted residuals.
Now, let’s apply this science to cannabis concentrates.
Compounds separated through distillation
When we talk about distilling cannabis products, we have to consider what components we are separating from the plant itself. These can be broken down into a few categories:
Cannabinoids: These are the naturally occurring compounds in the cannabis plant that give it its unique profile and react with the body’s natural cannabinoid receptors. These include tetrahydrocannabinol (THC), cannabidiol (CBD), cannabigerol (CBG) and others.
Terpenes: Naturally occurring compounds derived from repeat units of isoprene. These compounds are found in cannabis, hemp, hops and other plants as well. Well known terpenes include limonene (lemons), pinene (pine trees), linalool (lavender), among many others. Terpenes are thought to contribute to the health effects of the cannabis plant although much research has yet to be completed.
Flavonoids: These lesser mentioned compounds are phytonutrients found in virtually all plants and are partially responsible for color, aroma, and flavor. While these aren’t quite as prevalent in the cannabis plant, they may play a role in the potential health benefits found in cannabis.
Fats and waxes : Class of hydrophobic high molecular weight resins that are produced by plants and may be extracted.
How to extract CBD
Now that we’ve looked at the scientific basics and the compounds we can acquire, let’s dive into the cannabis distillation process.
Take CBD for example. CBD’s boiling point is roughly 320-356 degrees Fahrenheit. A typical solvent used for extraction is ethanol, which has a boiling point of 173 degrees Fahrenheit. Because the ethanol has a lower boiling point than the CBD, it will evaporate first and collect in a chilled condenser separating it from the desirable plant components.
So, the leftover product should be nothing but pure CBD, right? Well, not quite. The product may still contain chlorophyll and terpenes. How do you remove these to make a nice, clear distillate? You use wiped film distillation equipment.
Common distillation equipment
Short path distillation
A common class that covers a range of distillation equipment is referred to as “short path” but really isn’t due to the fact that the condenser is external to the evaporator. More accurately termed “fractional distillation,” this kind of equipment is typically constructed of glass and is used for solvent removal and distillation on a laboratory scale due to its relative simplicity, small footprint, and lower price tag.
Thin film distillation
When it comes to cannabis products, it’s very important to incorporate thin film distillation . This will create a thin film of oil across an evaporative surface. This, coupled with vacuum pressure to lower boiling temperatures, ensures that the evaporated components (cannabinoids in this case) aren’t in prolonged contact with the heat source reducing the risk of damaging them. There are several variations of equipment capable of doing this.
Likely the most commonly used equipment for solvent removal, rotary evaporators, or roto-vaps, utilize a rotating round bottomed flask to create a thin film. The heat source is reliant on a warm bath that the round bottom flask rests in. This is particularly good solvent removal at a small scale, but is discontinuous. This means it’s generally not a scalable technology if you have a lot of solvent to remove. They aren’t typically compliant with special fire hazard occupancy rules.
Falling film distillation
Similar to rotary evaporators, falling film distillation equipment is great for solvent removal and uses lower viscosity oils. This occurs by allowing the oil to drain down the inside of a heated column. This continuously creates a thin film on an evaporative surface before being collected on a chilled condenser.
Wiped film distillation
As a product becomes more refined, its viscosity increases. This means that typical methods of distillation like rotary evaporation or falling film evaporation aren’t as effective. Wiped film distillation machines use mechanical wipers that spread a thin layer of oil across a heated evaporative surface allowing the cannabinoids to evaporate and recollect on a chilled condenser that is only a short distance away. This is known as short path distillation. At this point, the final product could contain numbers of cannabinoids as high as 90 percent or more and should also be a nice golden color.
Why do distillates matter?
So, why go through all the trouble to grind, decarboxylate, extract, winterize, and distill a cannabis product? It all comes down to the final product.
On the product level, a distillate has the huge benefit of purifying key components of the cannabis plant that can be re-introduced with particularity. Through decarboxylation, extraction and distillation, desired components like CBD, THC, terpenes, and flavonoids become the basis of many different products including tinctures, edibles, topicals, and non-food supplements.
Typically, manufacturers will also sell bulk oil such as full spectrum distillate, broad spectrum, or crystal CBD isolates. Manufacturers use these to produce consumer products that are known in the market as full spectrum or broad-spectrum products.
- Full spectrum: These formulations contain cannabis plant components, cannabinoids as provided by the plant, and a full spectrum of terpenes. For CBD products, the THC is limited. Federal regulations only allow a percentage less than 0.3 percent of THC .
- Broad spectrum: These formulations contain CBD and a full spectrum of terpenes but not THC. However, they aren’t considered “THC-free” but are considered to be “THC non-detect” with the analytical method of choice. For example, THC isn’t detectable at 300 nm. Minor cannabinoids may or may not be present in broad spectrum oils depending on the plant. These formulations may be beneficial for consumers looking for the entourage effect , a synergistic effect of terpenes and cannabinoids that can amplify the beneficial effects of each compound without concern for THC content.
All of these formulations are reliant on a producer’s ability to purify each of the plant components through distillation. This way, any select combination of cannabinoids and terpenes can be created for a distinctive product tailored to the needs of the consumer. From the standpoint of a manufacturer, this is a crucial part of any cannabis market.
The future of cannabis products
Not long ago, the future of cannabis was on the horizon in the form of distillates, now the future is here. The ability to extract, separate, and reintroduce specific, purified cannabis components has opened a world of product formulation. Because of distillation, the world of cannabis has experienced these undeniable benefits:
- Consistently pure cannabis oils.
- The ability to create nearly endless product formulations.
- The opportunity to explore numerous health benefits of specific cannabis compounds.
Jon Thompson, PhD, is a separations scientist and CEO of extraktLAB, an accredited engineering company for the CBD, hemp and cannabis industries.
An Overview of the Cannabis and Hemp Oil Distillation Process
Are you looking to improve your cannabis and hemp oil extraction methods? In this blog, Maratek is going to give an overview of the cannabis and hemp oil distillation process and how it can help to create a consistent pure product.
What is distillation?
Distillation is a process that heats a substance into a vapor and cools it back to a liquid. This process can be used to separate components with different boiling points. There are different variations of this process, which are all dependent on the components, and the temperature, and pressure of the system.
Simple distillation is appropriate for the separation of materials that have significantly different boiling points. When heated the liquid that is more volatile will vaporize and travel through the system, recondensing into a liquid when it passes through a chilled condenser. This results in the volatile substance becoming separated from the initial product.
How is distillation used for cannabis oil?
The cannabis and hemp industry uses distillation to further purify crude oil. The extraction process generally uses solvents such as ethanol, or CO2 to remove the crude oil from the plant biomass. The distillation equipment then takes the crude oil and produces a pure product, usually of either THC or CBD distillate by removing other volatiles and contaminants.
Distillation can take multiple passes to remove all unwanted compounds before producing the intended final product. The first pass usually removes low boiling point volatiles. A second pass focuses on distilling the desired cannabinoids, leaving behind other contaminants such as waxes, sugars and any leftover plant material. This results in a pure product of the desired cannabinoids or terpenes depending on a company’s intention.
Multiple passes can be necessary especially if a company does not use a winterization process on their products . Winterization removes any contaminants like fats, and waxes from the initial oil extraction. Without this process those contaminants are left in the solution and will need to be removed during distillation to produce a pure final product. Setting up multiple distillation equipment that are connected directly to each other reduces the need for multiple passes through a singular system.
The most common form of distillation system is short path distillation. It is beneficial because the vapor travels a shorter distance before it is condensed, allowing the equipment to take up less space. The crude oil is deposited at the bottom of a flask where it is then heated to initiate the distillation process. This system generally gets used on a smaller scale, as it typically needs more manual operation or oversight.
A similar equipment is the wiped film distillation system. The only difference to the above system is the introduction of a wiper blade that spreads a layer of the initial feed product onto the chamber walls. This thin layer reduces the amount of time heat is applied to the product. Prolonged exposure to heat can degrade a cannabis product and this equipment reduces that risk. The wipers also provide an even spread that supports more consistent evaporation and condensation rates.
The popularity of wiped film short path distillation may also be attributed to its continuous feed abilities that increase output and efficiency. Continuous feed supports operation by helping to produce large quantities and maintaining consistency. This process is more automated due to continuous feed and the wipers and is therefore more suitable for large scale operations.
Temperatures and pressures used in a system can usually be altered to address a business’s specific goals. Changing the pressure can affect the temperatures at which certain compounds boil at, making it easier to remove them from the product. If boiling temperatures are lowered, this also decreases the risk of overheating and degrading the product.
Distillation is relatively simple once the extraction process has taken place. After all the undesirable materials are removed during the extraction process, the purest form of crude oil is left. As this is not a one size fits all method, the industry today requires you to focus on both scaling up for the mass market, and scaling down for smaller, more local needs.
As short path distillation requires less pressure to be exerted on the distillate, it is more common and favorable when working with volatile compounds and when purifying small amounts of substance. With heat, pressure, and humidity – it forces the remaining impurities and traces of solvent extraction residue out.
The short path causes the cannabis extract to break down into its constituent compounds. THC and CBD are separated out at different temperatures as they have slight differences in boiling points. It is more effective and has better results when it is done on a large scale using industrial level equipment. Once it is distilled, the cannabis concentrate has a higher CBD or THC content compared to the crude oil. Distillates of different cannabinoids can then be blended to customize a product.
If further purification is required, the distillate can be passed through an isolate production system to obtain up to 99.9% pure cannabinoids.
Want to learn more about the process of distillation in the cannabis and hemp extraction industry? Maratek has engineered short path distillation systems that will improve the purity of your product. Contact us today for more information .