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Homework Help: Distillation material balance

  1. Oct 31, 2009 #1
    1. The problem statement, all variables and given/known data


    A mixture of 40/60 mole% pentane/heptane is to be separated to give a top product of 95 mole% pentane and a bottom product of 5 mole% pentane.

    The column will operate at 1 bar witha reflux ratio of 0.5 kmol/kmol. It will have a total condenser and a partial reboiler. The feed is liquid at its bubble point.


    Taking a basis of 100 kmol feed:


    heptane----60.0-----1.9--- -58.0

    (D = distillate, B = bottoms product)

    3. The attempt at a solution

    I don't understand these numbers or how there derived??

    I would have said, 95% of the 40 kmol pentane in the feed would be in the distillate, which would be 38 kmol.
    And 5 % of the 40 kmol would be in the bottom, which is 2 kmol.

    What am I doing wrong?

    Thanks for looking :smile:
  2. jcsd
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