Vacuum Distillation 101

What is Distillation?

(According to Webster) Distillation is the process of first heating a mixture to separate the more volatile from the less volatile parts, and then cooling and condensing the resulting vapor so as to produce a more nearly pure or refined substance

What is Vacuum Distillation?

(Websterís no help here) Vacuum distillation is the process of heating a mixture to separate the more volatile from the less volatile parts, under a pressure which is less than atmospheric to reduce the required boiling point, and then cooling and condensing the resulting vapor so as to produce a more nearly pure or refined substance

How do you measure Vacuum?

[CTS]

Vacuum is usually measures as absolute pressure (say millimeters of mercury).

Benefits

High vacuum systems achieve gentle separation of materials at the lowest possible temperatures. Unlike batch distillation systems, which maintain large volumes of the material at distillation temperatures, wiped film and short path evaporators expose products to evaporation temperatures only for a brief period (less than one minute) and evaporation occurs as material flows constantly across the evaporator surface.

How significant is the effect of vacuum on the boiling point

Letís look at the effect of vacuum on the boiling point of a material:

[CTS]
Learn about Rolled Film Evaporators