noun[mass noun] Chemistry
Distillation of a liquid under reduced pressure, enabling it to boil at a lower temperature than normal.
- All of the liquid amines were purified by vacuum distillation just before use.
- We also purify the glycerol by vacuum distillation.
- One method, particularly common in Germany, is a process of vacuum distillation, whereby wine, at extremely low pressures at normal room temperatures, is separated into various fractions in a tall column.
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