ChE 381
Modified Raoults Law: yiP =
Modified Raoults Law Solution Strategy
xii(xi,T)Pisat(T)
i = function of xi and T
10/16/13
Pisat
= function of T
Scenario (a): Given T and x, find y and P
- Assess i and Pisat; these are known values
- Re-arrange Modifi
Given: T and x
T (K)
xMeOH
sat
PMeOH
PMAsat
(kPa)
Find: y and P
318
input by user
0.25
44.66636
A
xMA
64.95226 calculated from T
1.10786
0.75 calculated from xMeOH
gMeOH
1.864833
gMA
1.071695
(kPa)
yMeOH
calculated from A and x
0.5 guess (will goal seek)
ChE 381
Homework #7
Due at the beginning of class 10/30/13
GROUP:
1. Given the following mixtures of ethane, propane, isobutane, isopentane:
(a) A liquid that is 15% ethane, 15% propane, 30% isobutane, 40% isopentane at 600C. Find the
bubble-point pressur
ChE 381 Fall 2013
HW #6
Due 10/23/13
Individual
1. Does an azeotrope exist for methanol and methyl acetate at 95 kPa? If an azeotrope does exist, find
the corresponding composition and temperature at which it occurs. You can use either a mathematical
or g
ChE 381 Fall 2013
HW #6
Due 10/23/13
Group
1. Generate a Pxy diagram for a mixture of methanol (MeOH) and methyl acetate (MA) at 318K and a
Txy diagram at 90kPa (a) assuming ideal behavior and (b) using modified Raoults Law, where ln MeOH
= AxMA2 and ln M