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  1. fractionating column

    • IPA[ˈfrakSHəˌnādiNG ˈkäləm]
    • n.
      a tall, horizontally subdivided or packed container for fractional distillation in which vapor passes upward and condensing liquid flows downward. The vapor becomes progressively enriched in more volatile components as it ascends, and the less volatile components become concentrated in the descending liquid, which can be drawn off.
    • noun: fractionating column, plural noun: fractionating columns