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# HETP Calculations from Distillations

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I am trying to figure out a few questions/problems.

-You want a column to have 6 theoretical plates. Your packing material has a HETP value of 1.5. What is the length of the column that you would need? I thought I would multiply the 6 TP by the HETP value. (This was a past quiz question) How do I solve this type of question?

-When using a fractional distillation to separate 2 liquids, which boils first? The one with the higher vapor pressure or the one with the lower vapor pressure?

-Explain why the second boiling point is always going to be lower than its theoretical boiling point?

-Explain how fractional distillation is really a series of equilibriums (you must talk about the equilibrium coefficient).

##### Solution Summary

HETP calculations from distillations and distillations in general are discussed in the solution.

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-You want a column to have 6 theoretical plates. Your packing material has a HETP value of 1.5. What is the length of the column that you would need? I thought I would multiply the 6 TP by the HETP value. (This was a past quiz question) How do I solve this type of question?

http://en.wikipedia.org/wiki/Theoretical_plate

H = Nt x HETP = 6 x 1.5 = 9 (the units depend on the units ...

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