CHE 425
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LAST NAME, FIRST
CHE425: Problem set #8
1-7 Copy the program UnitOp8.exe from the CHE 425 class distribution folder to your flash
or H drive. You can also download the program from the website:
https://www.csupomona.edu/~tknguyen/che425/homework.htm.
Run the program and choose problem 1-8 in any order. Solve the problems with the data
provided by the program, copy the problem statement to Word. The program will check your
answer and provide an answer code when you click on “Check”. Copy the answer code and
paste them after the problem statement. You need to present all your work with a diagram in
details to get full credit. Your work must have the following items to receive full credits:
Problem statement
Diagram with given information to solve the equations for the unknown(s).
Details derivation of formula from the basic equations
Numerical values of the variables and parameters in the formula.
Final numerical answers with appropriate units
The “check” code from the computer program.
3) The following data for methanol-water system at 1 atm are given:
x or y
0 5 10 15 20 30 40 50 60 70 80 90 100
H(Btu/lbmol) 20720 20520 20340 20160 20000 19640 19310 18970 18650 18310 17980 17680 17390
h(Btu/lbmol) 3240 3070 2950 2850 2760 2620 2540 2470 2410 2370 2330 2290 2250
Vapor liquid equilibrium data:
x
0 2 4 6 8 10 15 20 30 40 50 60 70 80 90 95 100
y
0 13.4 23.0 30.4 36.5 41.8 51.7 57.9 66.5 72.9 77.9 82.5 87.0 91.5 95.8 97.9 100
o
T, C 100 96.4 93.5 91.2 89.3 87.7 84.4 81.7 78.0 75.3 73.1 71.2 69.3 67.6 66.0 65.0 64.5
Use Matlab to construct the enthalpy concentration diagram with the tie lines from
equilibrium data. Plot your results on the diagram. Label the plot with your name
using the Title command. You can plot the Hxy diagram and draw the tie lines from
the following Matlab codes:
xy=[0 5 10 15 20 30 40 50 60 70 80 90 100];
hv=[20720 20520 20340 20160 20000 19640 19310 18970 18650 18310 17980 17680 17390];
hl=[3240 3070 2950 2850 2760 2620 2540 2470 2410 2370 2330 2290 2250];
xv=[0 2 4 6 8 10 15 20 30 40 50 60 70 80 90 95 100];
yv=[0 13.4 23.0 30.4 36.5 41.8 51.7 57.9 66.5 72.9 77.9 82.5 87.0 91.5 95.8 97.9 100];
plot(xy,hv,xy,hl)
nt=length(xv);
hlt=spline(xy,hl,xv);
hvt=spline(xy,hv,yv);
for i=2:nt-1;
x1=xv(i);x2=yv(i);
y1=hlt(i);y2=hvt(i);
line([x1 x2],[y1 y2])
end
6) Follow the instructions in problem 3 to plot your results on the Hxy diagram.
7) Follow the instructions in problem 3 to plot your results on the Hxy diagram. You need to
show your calculation using linear interpolation and graphical result. The Hxy diagram must
be plotted using Matlab. The tie lines and operating lines can be plotted accurately by hand
using the compositions calculated using interpolations.
8) Run the program Microplant as an Established Troubleshooter and turn in the last display
of the program.
You need to copy the Microplant folder from the CHE425 distribution folder into your H:
drive or your flash drive. Open the Microplant folder and double click on Microplant.exe to
run the program. Turn in the last page of the program with performance number.