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fractionating column

British  

noun

  1. chem a long vertical cylinder used in fractional distillation, in which internal reflux enables separation of high and low boiling fractions to take place

"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

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The liquid there heated and changed state, rising as vapor through the fractionating column to catch in the condenser and trickle in droplets into the collection flask.

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