Thank you for contacting Project CBD . Check out the boiling point chart of various cannabinoids and terpenes attached below. THC boils at a slightly lower temperature than CBD . However, when vaporizing a strain that contains any THC at all, you still may absorb some effects. Here is why:
Another reader from Poland had a related question on decarboxylation from CBDA to CBD :
As great of a product as a Volcano is, it is not perfect. The digital Volcano model provides tolerances at +/- 0.5 degrees Celsius. Nevertheless, beyond that, there are marked temperature gradients in the chamber—one area will be quite hot compared to another, particularly if the herbal material is large or clumped. Thus, you cannot ensure that the herbal material will be exposed to uniform temperatures required for fractionation. Therefore, if there is THC present in the cannabis you are vaporizing, some will likely remain in the vapor even after its boiling point is exceeded.
Project CBD ’s Response:
“At what temperature I should heat cannabis to decarboxylated CBDA to CBD ? 80 degrees Celsius? 120 degrees?”
To further concentrate the distilled CBD into an isolate with purities as high as 99.9%, processors use crystallization. The process uses a solvent to dissolve the refined product. Cold temperatures allow the CBD to crystallize into a purified form. The cold temperatures required to separate the CBD after distilling is another form of winterization used for purifying.
A closed system such as this that recycles the solvent is safer than open methods that evaporate the flammable solvent into the air. Additionally, recovering the solvent reduces operating costs and enhances the safety of the finished product. Careful control of the extraction process using solvents in a closed-loop system may result in extracts with as little as 200 ppm of hydrocarbons.
Because carbon dioxide is not flammable nor noxious, this method proves safer compared to hydrocarbon extraction, but the overall equipment and operating costs can be higher as well.
While some growers dry their plants, the chance for mold growth in the presence of heat or moisture may be too great. Storing hemp at low temperatures reduces the loss of CBD from the plant, which breaks down from heat and oxidation.
For frozen hemp, transporting and storing the products require containers that can maintain subzero temperatures. Allowing the product to thaw and refreeze will degrade the quality. Transportation containers must be portable and have self-contained cooling units to keep the internal temperature well below freezing.
Maintaining temperatures of large volumes of ethanol and ethanol solutions at -30°C and lower requires very powerful freezer units, but most equipment made for these temperatures were originally designed for laboratories and much smaller volumes of fluid.
For drying, ideal conditions include humidity of 60% and temperatures between 60- and 70-degrees Fahrenheit. Temperatures that are hotter than this may cause the plants to oxidize, reducing the available CBD. Additionally, excessive moisture can promote mold growth, ruining a crop.