First Challenge Problems

Problem Set 1. Vapor Liquid Equilibria

 

Part a) Determine the Px curve for a mixture of dimethyl ether and propylene at -20 °C (253.15 K)with explicit pressures for x=0, 0.2, 0.4, 0.6, 0.8, 1.0 and the pressure at 20 °C (293.15 K) for x=0.5

 

Part b) Determine the pressure and composition of the azeotropic point for a mixture of nitroethane and propylene glycol monomethyl ether at 80 °C (353.15 K)and at 40 °C (313.15 K), and the bubble point pressure for x=0.2 (nitroethane) and x=0.5

 

Problem Set 2. Prediction of density

 

The task is to determine the density of the following fluids at the specified conditions. Benchmarks are provided for part a, water.

 

part #	system	State Point 1	State Point 2
a	water	0.1 MPa, 293 K (998.24 kg/m3)	2.0 MPa, 423 K (918.01 kg/m3)
b	Cyclohexane	0.1 MPa, 300 K	20 MPa, 400 K
c	Isopropanol	0.1 MPa, 298.15 K	5 MPa, 400 K
d	Diethanol amine	0.1 MPa, 330 K	5 MPa, 400 K
e	1,2,3-trichloropropane	0.1 MPa, 290 K	1.5 MPa, 400 K
f	Triethylene glycol	0.1 MPa, 310 K	2 MPa, 280 K
g	Pyridine	0.1 MPa, 298 K	10 MPa, 375 K
h	Water + choline chloride (Aqueous choline chloride)	0.1 MPa, 298 K, 20% choline Cl by weight	1 MPa, 305 K, 10% choline Cl by weight
i	Water + methanol (50:50 by mass fraction)	0.1 MPa, 325 K	10 MPa, 400 K

 

 

 

 

Problem Set 3. Prediction of Viscosity

 

The task is to determine the shear viscosity of the following fluids at the specified conditions.

 

part #	system	State Point 1
a	N-nonane	0.1 MPa, 300 K
b	Isopropanol	0.1 MPa, 300 K
c	N-nonane + Isopropanol (0.5 mole fraction)	0.1 MPa, 300 K
d	N-nonane + Isopropanol (0.75 mole fraction isopropanol)	0.1 MPa, 300 K