CHE 350
Homework 4
Solutions
See the attached spreadsheet for the calculations necessary to generate the X/Y
plot.
a. The entering gas has 15 mol% acetone, so, on a solute free basis, Y = 15/85 = 0.176. 90%
of the acetone is absorbed, so .9 * 15 = 13.5; 1
1. Assume constant molar overflow.
The feed is a saturated liquid, meaning that the qline has an infinite slope, or is a vertical line at the
feed composition zF = 0.5.
The slope of the rectifying section opera
Exam 1 2017
CHE 350
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Simulating a distillation column
Assigned 4/12/17
Due 4/28/17
Write a program using the bubblepoint method to simulate the behavior of a multicomponent mixture of
hydrocarbons in a distillation column with a total condenser, a partial reboiler, and 30 st
1.
Bubble point equation:
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Use, for instance, GetKValues to find the K values as a function of T and find the root of
the equation. Example code:
comp = [2 3 4 5]
z = [.25 .25 .25 .25]
BubblePoint = @(T) sum(z.*GetKValues(450000,T,comp,z,z)
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CHE 350/ 2014/ HW Set 1
1) A) The liquid product flow rate is 1.5 times the vapor product flow rate:
L=1.5V
A material balance tells us that:
F=L+V
V=FL
L=1.5F1.5L
F=100 kmol/h
L+1.5L=150 kmol/h
L=150/2.5=60 kmol/h
V=40 kmol/h
Input enthalpy:
100,000 mo
1. A. Bubble point (vaporization):
a. To find the bubble point, draw a vertical line from the feed composition (za = .4) up to the liquid line
on the Txy graph.
T = 68.2C
To find the composition of the firs
Programming flash calculations
Assigned 2/21/17
Due 3/22/17
A stream of hydrocarbons is to be separated in singlestage vaporliquid flash process. The feed stream is a
liquid with the following composition, in kmol/h:
propane:
nbutane:
ibutane:
npenta