Chemical Engineering 150B- Fall 2005
Problem Set #7
Solutions
Problem 1.
(15 Points)
Consider an adiabatic equilibrium flash with a high pressure
liquid feed that is separated into liquid and vapor streams at lower pressure.
The
variables are all as indicated in the following figure:
There are C components in equilibrium, and thus all of your answers to the below
questions will have C as part of the expression.
(a) Both extensive and intensive variables are listed in the figure.
Express the total
number of variables in terms of C.
(b) Write all the independent equations that relate the variables.
You may simply
write your answer as "one energy balance, three vapor-liquid equilibrium
equations, etc."
(c) Express the total number of equations in terms of C.
(d) Determine the number of degrees of freedom in terms of C.
(e) What variables in (a) would you think to be most likely as being fixed by the
process for which you are designing the flash unit?

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