fractionating column noun chem a long vertical cylinder used in fractional distillation, in which internal reflux enables separation of high and low boiling fractions to take place Liberaldictionary.com
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Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Fractional distillation is useful when the volatile components have less difference in boiling point (generally the difference is 25 degree).
Laboratory fractionating columns[edit]
A fractionating column is a long tube provided with obstructions or packed with glass beads. The obstructions provided slows down the passage of vapours
Crude Oil Fractionating Column