1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Distillation material balance

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

    Question:

    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.

    Solution:

    Taking a basis of 100 kmol feed:

    Kmol-------Feed-----D---------B

    pentane----40.0-----37.0----3.1
    heptane----60.0-----1.9--- -58.0
    total-------100------38.9----61.1

    (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
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?



Similar Discussions: Distillation material balance
  1. Gearbox and Materials (Replies: 0)

Loading...