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cbd isolate recrystallizing

In short path distillation, the extract is heated and each compound is separated due to different boiling points.

If chromatography is used, available methods include supercritical CO2 chromatography, High-Pressure Liquid Chromatography (HPLC) using solvents such as pentane, flash chromatography, and rotary chromatography. Using CO2 is often preferred because it doesn’t leave behind any toxins. However, there are many factors to weigh when considering CO2 Extraction vs other methods like Ethonal Extraction. Another article we wrote discusses this topic in depth. You can read it here: Ethanol vs CO2 Extraction CBD: Pros & Cons of Each Method.

To Do or Not to Do Chromatography

After this process of separating the CBD and refining it to very high levels by removing impurities such as THC and terpenes, further purification is done and the CBD is crystallized so that the CBD is collected in solid form.

  • Chromatography is one of the most common methods used to CBD extract from hemp, especially in large-scale production operations.

    This methodology separates and purifies chemical compounds “taking advantage of their differences in properties.” It is a “ practical and straightforward way to purify a substance from a complex mixture.”

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The density of pentane at room temp is 0.626 g/mL. 40kg of of distillate into 20 litres of pentane is nearly a 4:1 ratio of distillate to pentane. I don’t recommend that kind of saturation for your first crystallization.


Time is going to be dependent on a lot, but yeah if your heaters and chillers can keep up then 8 hours is pretty reasonable.

A jacketed vessel with stirring will be used to dissolve and crystallize the CBD. A heating/cooling bath is connected to the vessel jacket and will be used to control the temperature of the vessel.

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