After trying other vacuum distillation techniques, it was found that a high vacuum centrifugal molecular still gave the best results. Tocopherals are used as a preservative and are added prior to distillation. The Myers Vacuum model Pilot 15 was chosen for its compactness, easy connections, and mobility. This system was found to be better than other types of vacuum stills because of the very short residence time on the heated surface. The Pilot 15 processed about 4-5 gallons per hour.
Larger systems are available for scaling up.
High vacuum centrifugal molecular distillation is a process designed for separating heat sensitive, high molecular weight material. It features applying a very thin, continuously moving film on a heated rotor under high vacuum and placing a condensing surface a short distance away. The residence time on the heated surface is measured in parts of a second. This allows the user to make very fine cuts with the least amount of decomposition from heat. Material enters the Pilot 15 using a variable speed gear pump.