CHE 4253  Quiz 1
Instructor: Dimitrios V. Papavassiliou
September 19, 2006
Name:……………………….
OU ID:………………………
Answer all questions and show your calculations, if any are necessary.
1.
(10 points) Assume a twophase equilibrium flash column. Assume that there are N
c
components in the inlet stream, and that the inlet conditions (i.e., temperature,
pressure and total flow rate) are known.
(a) How many variables are there for each stream? How many variables total for the
system of the column with the streams?
(b) How many degrees of freedom are there for this column? (Assume that in addition to
writing down the mass balance equations, you know the inlet composition of the feed
stream F, you know the thermodynamics [i.e., the phase equilibrium correlations for
each one of the N
c
components], you know that T
V
= T
L
, and P
V
=P
L
, and that you
know that
∑
=
1
F
x
,
∑
=
1
V
x
, and
∑
=
1
L
x
, where
x
is the molecular fraction in
each stream.)
(c) If the column is known to be adiabatic, how many degrees of freedom do you have
now (assuming everything in (b) above)?
(a)
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 Spring '09
 Lobban
 Thermodynamics, Mass Balance, ........., Capital accumulation, FCI

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