Winterization Of CBD Oil


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Winterization is necessary to create a higher purity of cannabinoids. Removing lipids results in a higher quality product. One of the most critical steps in terms of making a clean cannabis product is CBD winterization. If you’ve ever wondered what that means, click to learn more! Winterization is an important step in oil purification, including cannabis extracts, that allows for the removal of inactive compounds.

Why is the Winterization Process Important in Cannabis Oil Extraction?

The winterization process, in simple terms, is the removal of fats, lipids and other unwanted materials from crude oil extract. Winterization is necessary to create a higher purity of cannabinoids. Lipids dilute the cannabinoid fraction, therefore removing them results in a higher quality product.

The transparency of the product is also affected by lipids in distillate. When lipids are not removed, the distillate will not be transparent – this is a sign of a lower-quality and lower-valued product.

Another adverse effect that lipids have in distillate is the way that they burn on coils in vape pens. Lipids will make the vape pen taste burnt which is unsatisfactory to the consumer. Winterization is a key process that differentiates a product from being either low quality or high quality. That directly affects the value of the product that you are creating.

What is the winterization process?

During winterization, a non-polar oil extract is dissolved into ethanol or other polar solvent. The solution is placed in sub-zero temperatures (usually in the range of -20 to -80 degrees Celsius). When using ethanol, the ratio of ethanol to extract is often 10mL ethanol to 1g of oil. However this ratio often ranges between 5ml to 1g and 20ml to 1g.

During this process in the sub-zero temperatures, the lipids float to the top of the solution because of their lower solubility. The ideal time to leave the solution in cold temperatures is at least 24 hours.

There are multiple filters that the solution can go through such as paper filters and metal micro-filters. The lipids are filtered out of the solution through the filtration process and what is left is a high-purity distillate.

Why is winterization important in the cannabis and hemp oil extraction process?

To truly compete in the cannabis and hemp oil industry, winterization is a vital process. As mentioned previously, a winterized solution has more value than a solution that is not winterized.

Not only is value a factor, but customer satisfaction also plays a big role in this process. When an extract has fat and lipids left in it, it burns, vapes and tastes bad. Consumers will not buy this low-quality product again.

The saying “look good, feel good” does not only apply to people, it also applies to distillate. Everyone likes a shiny new product, not a cloudy and murky one. This is especially true for distillate consumers as transparency is an easy indicator of the level of purity in an extract. To ensure that a product can compete in the cannabis industry, winterization must be included in the extraction process.

Want to learn more about the winterization process and how Maratek can help automate and perfect the process with our expertly engineered Turnkey Automatic Winterization System (TAWS)? Contact us today. We would love to answer any questions that you may have.

What is CBD winterization?

There are many steps to processing hemp into a consumer-level product. One of the most critical, in terms of making a clean product, is winterization. No, this isn’t what your dad does to the lawnmower every fall. Winterization is a process that removes undesirable elements extracted from hemp, for example, fats, waxes, and lipids leaving behind clean, consumable CBD oil. Without CBD winterization, these unwanted materials would cause the final product to be cloudy, darker, and have an unpleasant taste.

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What steps come before the winterization of oil?

The winterization process starts with raw extract straight from our CO2 machine (see photo below). This CBD crude oil contains all the essential parts of the hemp plant except for the actual plant material itself. CBD, minor cannabinoids, terpenes, fats, waxes, and lipids are all part of this viscous liquid. Crude oil extracted from a CO2 machine will have an attractive, light color to it, especially compared to alcohol extracted oil, which will have a dark, sludge-like appearance.

What is CBD Winterization?

The CBD crude oil is combined with 200 proof alcohol and stirred vigorously until completely mixed. The alcohol is used to thin the crude oil out, as the desirable parts of crude will go into solution with the alcohol while the undesirable parts will coagulate and freeze allowing them to be filtered out. The mixture is then placed in a deep freezer at below-zero temperatures. Once it has time to freeze it looks cloudy and is ready for filtration. The next step is to place the mixture in vessels that use paper filters to remove the frozen fats, waxes and lipids. The actual CBD oil remains with the alcohol solution and passes through the filter while the frozen undesirable parts are caught by it. The photo below shows what a filter will look like after the solution passes through it. When properly winterized, the filters will catch all of the frozen plant waxes from the oil, leaving them sitting on top. Once the pass is complete, the filters and waxes are discarded. The clean oil flows through the filter into a collection vessel where it is refrozen for more passes. We winterize multiple times just to make sure that our oil is 100 percent clean!

So wait, even though the winterized oil is CO2 extracted, it will still contain alcohol?

Nope! The alcohol is just used to thin the CBD oil in order to properly filter it. Once it’s been filtered and the undesirable elements have been removed, it’s time to remove the alcohol. This is done with a piece of equipment called a rotary evaporator (rotovap). This is CEO Craig Henderson, who started refining hemp from the garage of his home, using a rotovap in the early days of Extract Labs. This bad boy is an efficient way to quickly distill the alcohol out of the solution. The bulb spins in a hot water bath while the system is under vacuum, allowing the alcohol to evaporate out while leaving the winterized oil spinning in the bulb. The alcohol vapors then travel up to the chiller coils where they condense into a liquid and drip down for collection. The alcohol is then recycled into our process. Once the rotovap is done with a work order, the spinning bulb will contain only clean winterized CBD oil. The winterized CBD is then ready to move on to the next phase of the process. From here, the winterized oil will be formulated into tinctures or it will move to our distillation department for further refinement.

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Cannabis / Hemp Winterization

Winterization is an important step in the purification of oils-including cannabis extracts-that allows for the removal of inactive compounds like fats, waxes, and lipids.


Precipitation of inactive compounds


Removal of unwanted compounds and refinement of cannabis extract

Solvent Recovery

Reclaim solvent to perform further extractions, winterization, or other post-processing techniques


Polish and activate crude oil for further refinement


Purification into a highly concentrated and refined cannabinoid oil


CBD isolate is used for herbal supplement and end-product applications


THC, heavy metal, pesticide, and color remediation


Preparation into tinctures, topicals, vaporizer cartridges, water-solubles, and other consumer focused end-products


Crude oil is extracted directly from plant material

Winterization Solutions

Buchner Funnel Kit

Our Buchner Funnel Kit helps you effectively perform vacuum filtration at a small scale. The kit includes a Duran Filter Flask, a Porcelain Buchner Funnel, and a full Filter Adapter Set for creating a vacuum-tight seal.

The kits are available in four different flask sizes; 5L, 10L, and 20L.

Available Sizes

5L, 10L, 20L, 20L Multi-Funnel


Duran Filter Flask, Porcelain Buchner Funnel, Filter Papers

M.W. Watermark Filter Press

Dramatically improve your filtering process while increasing capacity with these large-scale filter presses.

We carry a selection of industrial plate filter dimension sizes and a range of capacities, to fit the ever-changing needs of our customers.

  • FP-320 – (12.5″ x 12.5″) (Min. 2.8L to Max. 14L)
  • FP-470 – (18″ x 18″) (Min. 14.2L to Max. 113L)
  • FP-630 – (24″ x 24″) (Min. 57L to Max 342L)

Filter Style

Multi-plate Positive Pressure Filtration

Feed Pressure


Air-driven Diaphragm Pump

The Importance of Winterization

Winterization is a vital step in the purification of oils, including cannabis extracts. Winterization allows for the removal of inactive compounds like fats, waxes, and lipids. This process can be performed in a few different ways but what each has in common is the use of cold temperatures to facilitate precipitation of the undesired compounds. The resulting solids are then removed via filtration.

Winterization is most commonly performed as a post-processing step, but there are other techniques that can also be used to keep cannabis extracts free from undesired compounds. Below, we will expand upon winterization in cannabis processing and its effects on end product creation.

Why Winterization?

Winterization is a key step in the chain of cannabis processing. It creates clean crude extracts that are free of fats, waxes, lipids, and other inactive compounds. Those compounds contribute a poor flavor and aroma to end products and can also cause potential health risks from ingesting them. Winterized extracts are more sought after by the market, and while they take a few extra steps and pieces of equipment, they will provide you with higher-quality products to bring to market.

Winterization In Post Processing

Winterization is performed after the initial extraction process. The crude extract is dissolved in a solvent, commonly ethanol, and the solution is placed in a freezer. The colder the temperature, the faster fats, waxes, lipids, and other inactive compounds will precipitate from the solution.

Freezer, Chest Style

Low-Temperature Freezer, Chest Style

Upright Freezer (-40°C)

Ultra Low, Upright Freezer (-40°C to -85°C)

Lab Freezer, Upright Style (-15ºC to -30ºC)

Ultra Low Freezer, Chest Style (-40°C to -85°C)

The precipitate will flocculate together and form a large, fatty-looking mass suspended within the solution. The solution must then be passed through a filter to remove the solidified fats and waxes. For small-scale processing, filtration is easily accomplished with a vacuum-assisted Buchner Funnel. At larger pilot-and-industrial scales, Filter Presses, Lenticular Filters, Bag Filters, or other methods may be used.

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Filter Press

Buchner Funnel Kit

FP1 Filter Press

4 Stage Lenticular Filter Skid

The freezing and filtration steps are often repeated multiple times to fully remove all inactive compounds. After the undesired components are fully removed, the crude extract must be separated from the solvent by evaporation. This may be performed in rotary evaporators, falling film evaporators, recovery membranes, and more. This process creates a clean and appealing crude extract that can be turned into many marketable end products such as high-quality distillate, isolate, edibles, and topicals.

Inline Winterization & Alternatives

While not technically winterization, there are other methods for keeping extracts clean from waxes, fats, and lipids. These may be performed through control of variables, inline with extraction, through specialized membranes, or by introducing additives to induce precipitation.

In closed-loop hydrocarbon extraction systems, solvent is often injected into the system at an ultra-low temperature. As the solvent washes over the cannabis plant material, it does not extract the unwanted inactive compounds due to the effect of cold temperatures on solubility. This reduces post-processing steps and allows the extraction process to create a desirable end product without additional equipment for winterization.

Some closed-loop extraction systems also have a secondary column that performs inline winterization. The secondary column holds only the crude extract solution, which is then chilled to an ultra-low temperature. This is followed by a stack of filters that remove any precipitated fats and waxes. While this is inline winterization, it is often referred to as “dewaxing”.

The same temperature dependence on the solubility of a solvent also applies to ethanol extraction. When the ethanol solvent is properly chilled prior to the extraction, it will not dissolve fats, waxes, and lipids from the plant material due to the extremely cold temperature. Similar to the secondary column in the closed-loop example above, winterization may also be performed inline immediately following ethanol extraction by channeling the crude extract solution into a secondary vessel that chills to an ultra-low temperature.

After chilling, the solution is forced through an inline filtration system to remove the precipitated compounds. This reduces possible contamination by never exposing the solution to the atmosphere.

Membrane Filtration

Membrane filtration is another method of dewaxing and an alternative to winterization. This method removes fats, waxes, and lipids from the solution but does not require ultra-low temperatures. In fact, this method can be done at room temperature in most cases. Membrane filtration is achieved by permeation of the solution through the membrane and is often much faster than standard filtration styles due to the shape of the membrane and backpressure of the solution.

Why Choose Lab Society?

We’ve been at the forefront of the cannabis processing industry for many years now. And we’ve helped countless businesses and labs just like yours grow and become profitable. Let us create a tailored solution to fit your processing needs. When it comes to winterization, we have the expertise and equipment selection you need to consistently produce cannabis oil at any scale, with any budget, and for any operational capacity.

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