The ground plant material is loaded into the extraction chamber and carbon dioxide (CO2) passes through the material at selective temperatures and pressures, extracting precise compounds into a crude oil.
Ethanol is added to the crude oil, then the mixture is placed into a freezer where the undesirable compounds are precipitated out. Then, they can be filtered from the oil.
The ethanol-oil mixture is heated, causing the ethanol to evaporate. It then condenses further down the distillation line so it can be collected and reused in future batches.
The extract can be heated to convert the THC-A to THC via decarboxylation. This activates the THC, allowing its effects to be felt after ingestion.
This step is optional and can be performed at most stages of processing.
The extract oil can now be further concentrated and purified via distillation and/or isolation.
This step is optional, depending on your desired final product.