Systems and methods for cannabis cbd extraction

A system for preparing a purified plant extract, comprising:

• a centrifugal separation unit, comprising at least one centrifugal separator, configured to receive plant material and a liquid solvent comprising ethanol, mix the plant material and the liquid solvent to form a slurry, and centrifuge the slurry in the centrifugal separator to separate the slurry into a solid residue and a raw extract, wherein the raw extract comprises at least one compound of interest and at least most of the liquid solvent;
• a filtration unit, comprising a filter assembly, configured to filter the raw extract to remove entrained solid plant material from the raw extract;
• a concentration unit, comprising an evaporator configured to receive the raw extract and heat the raw extract to remove at least most of the solvent therefrom by evaporation to thereby form a concentrated extract;
• a settling unit, comprising at least one settling vessel, configured to receive the concentrated extract and cause sedimentation of at least one impurity therefrom;
• a decarboxylation and degassing unit, comprising an atmosphere heating vessel and a vacuum heating vessel, wherein the atmosphere heating vessel is configured to receive the concentrated extract from the settling unit and heat the concentrated extract under approximately ambient or atmospheric pressure to decarboxylate at least a portion of the concentrated oil to form a decarboxylated oil, wherein the vacuum heating vessel is configured to receive the decarboxylated oil from the atmosphere heating vessel and heat the decarboxylated oil under sub-atmospheric pressure to form a winterized oil;
• and
• a short-path distillation unit, comprising at least one short-path distillation apparatus configured to receive the winterized oil from the decarboxylation and degassing unit and distill the winterized oil to form the purified plant extract.