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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 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.
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 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.
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.
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 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.