fractional distillation

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the process of vaporizing and condensing a substance to purify it or to separate a volatile substance from less volatile substances. Called also vaporization.
fractional distillation separation of volatilizable substances into a number of fractions, based on their different boiling points.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

frac·tion·al dis·til·la·tion

distillation of a compound liquid at varying degrees of heat whereby the components of different boiling points are collected separately.
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