Once winterization has been completed it is necessary to now quickly filter those fats and waxes we coagulated from the miscella. A filter press is used with the assistance of a vacuum pump to pull the miscella mixture through a series of filter plates. Fats, waxes, etc are collected in one vessel and the desired miscella in another.
To make any concentrate you first have to extract. Manufacturers can use either a hydrocarbon solvent, like butane or propane, or ethanol solvent. Typically, we see ethanol used for the production of CBD isolate often with the use of a larger commercial extraction system – like a centrifuge. Smaller extraction systems can be used, it just depends on your throughput goals.
Step 2: Winterization
Making CBD isolate requires more steps than creating a CBD oil, as you have to remove every other element, such as phospholipids and flavors, from the product. While the process is more complex and requires additional equipment, it creates a totally pure end product that is free of anything besides CBD.
CBD isolate is 99% pure CBD, often in the form of a white powder that can be mixed into drinks or taken sublingually. This option is often popular among people who are just beginning to explore the use of cannabis or hemp derived products or looking to avoid the euphoric high associated with THC. It is also a great option for people who want hyper-accurate doses of CBD and the flexibility to create their own customized mixtures in their preferred carrier oil or liquid.
Step 1: Extraction
In order to achieve optimal CBD content, decarboxylation is a critical step prior to distillation. The process of decarboxylation is to remove carboxylic acid and CO2 from cannabinoids present in the cannabis extract. Converting the acidic cannabinoid (CBDa) to its neutral form (CBD) ensures the end product contains all of the several benefits the cannabinoid has to offer. Furthermore, failure to remove CO2 from the extract will also affect the ability to properly form a vacuum in your distillation apparatus. The decarboxylation process is achieved through the application of heat in a reactionary vessel.
Crystallizing oil with contamination will lead to poor yields.
CBD Crystallization Equipment
The mother liquor still contains dissolved CBD. This solution can be reprocessed! One caveat is that the mother liquor will accumulate THC over time. This sets a practical limitation to the number of crystallization.
Reprocess Mother Liquor
Once precipitation stops, flush or physically remove The CBD crystals from the reactor. Vacuum filter the crystal/liquid slurry to remove the mother liquor from the CBD crystals. Rinse the crystals with ice-cold pentane to rinse impurities from the crystal surfaces. More rinses with pentane can improve poor color, but losses in total yield will occur. Keeping the CBD and materials cold during this step will help give you a better yield.