vacuum distillation

(from the article `distillation`) A variation of the reduced-pressure process uses a vacuum pump to produce a very high vacuum. This method, called vacuum distillation, is sometimes ... Vacuum distillation is sometimes used in fire refining. In this process, molten tin is heated in a dense graphite vessel at high temperatures (1,100°...
Found on http://www.britannica.com/eb/a-z/v/1

Vacuum distillation

Vacuum distillation is a method of distillation whereby the pressure above the liquid mixture to be distilled is reduced to less than its vapor pressure (usually less than atmospheric pressure) causing evaporation of the most volatile liquid(s) (those with the lowest boiling points). This distillation method works on the principle that boiling occ
Found on http://en.wikipedia.org/wiki/Vacuum_distillation

Vacuum Distillation

Vacuum distillation is a distillation process used for materials that have very high boiling-points or are likely to decompose below their boiling-point. Air is evacuated from the apparatus with a vacuum pump, and the vacuum so formed causes the materials being heated to boil at a temperature lower than they would under normal atmospheric pressure.
Found on http://www.probertencyclopaedia.com/browse/GV.HTM
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