Solutions Manual for Computer Methods in Chemical Engineering, 1st Edition by Nayef Ghasem

Solutions Manual for Computer Methods in
Chemical Engineering, 1e by Nayef Ghasem
(All Chapters)
Chapter 1

1.1 Dew point calculation
Calculate the temperature and composition of a liquid in equilibrium with a gas mixture
containing 10.0 mol% benzene, 10.0 mol% toluene, and balance nitrogen (considered
noncondensable) at 1 atm

UniSim solution (Fig. 1.1)
The liquid at equilibrium with its gas mixture is at the dew point, setting the vapor/phase ratio
to 1. The pressure is 1 atm, and as the basis, set the molar flow rate to 1 kgmol/s
The temperature is 51.1oC. The compositions of the vapor and liquid are shown in the figure
below




Fig. 1.1 Stream vapor and liquid compositions

PRO/II solution (Fig. 1.2)




Fig. 1.2 PRO/II simulated results for the case described in problem 1.1.


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,1.2 Compressibility Factors
Fifty cubic meters per hour of methane flow through a pipeline at 40.0 bar absolute and 300.0
K. Estimate the mass flow rate.

UniSim solution (Fig. 1.3)

In the molar flow rate cell, set the volumetric flow rate to 50 m3/h.
Equation of state: Peng Robinson.




Fig. 1.3 stream conditions


The compressibility factor (Z) = 0.9199




Fig. 1.4 Compressibility factor



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,PRO/II simulation (Fig. 1.5)




Fig. 1.5 PRO/II generated the molar flow rate of 50m3/h of methane.




Fig. 1.6 Compressibility factor (Z)




1.3 Use of Raoult’s law
A liquid mixture contains 40 % (mole percent) benzene, and balance is toluene equilibrium
with its vapor at 30.0°C. What are the system pressure and the composition of the vapor? Use
Unisim, PRO/II, and Aspen Plus.


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, UniSim solution (Fig. 1.7)
The system is at its boiling pressure at 30oC. The fluid package is NRTL.




Fig. 1.7 Flash unit in Hysys

PRO/II simulation (Fig. 1.8)




Fig. 1.8 Flash unit in PRO/II



1.4 Use of Raoult’s law
A liquid mixture contains an equal molar of benzene, and toluene is in equilibrium with its
vapor at 0.12 atm. What are the system temperature and the composition of the vapor? Use
Unisim, PRO/II, and Aspen Plus.

Hysys solution (Fig. 1.9)
The bubble temperature at 0.12 atm
Fluid package: NRTL
I am using the separator from the object palette of Hysys.




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