Assign Q CHE553
2
Assignment 1 Mac 2015 Question 1 A gas well stream contains a mixture of 344 kmol/h methane, 354 kmol/h propane and 50 kmol/h n-butane. This stream is fed into a partial condenser maintained at a pressure of 20 bar, where its temperature is brought to 25 C. Determine the flowrate of the vapor that condenses and the compositions of the vapor phase leaving the condenser. ln P sat / kPa= A− B T / K +C A B C Methane 13.58 968 -3.72 propane 13.71 1873 -25.10 n-butane 13.98 2292 -27.86 (15 marks) Question 2 In a separation process, a binary mixture of ethanol (1) and methy acetate consists of vapor and liquid phases in equilibrium at 390 K. The correlations for the activity coefficients and saturated pressure for the system are given as follows: ln γ 1 =0.75 x 2 2 ln γ 2 =0.75 x 1 2 lnP 1 sat ( kPa )= 16.8958− 3795.17 T( K )−42.232 lnP 2 sat ( kPa )= 14.2456− 2662.78 T( K )−53. 46 a) Prove that azeotrope condition exist at 390 K. b) Calculate the pressure and compositions of the system at the azeotrope condition. (10 marks)
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Transcript of Assign Q CHE553
Assignment 1
Assignment 1Mac 2015
Question 1A gas well stream contains a mixture of 344 kmol/h methane, 354 kmol/h propane and 50 kmol/h n-butane. This stream is fed into a partial condenser maintained at a pressure of 20 bar, where its temperature is brought to 25 C. Determine the flowrate of the vapor that condenses and the compositions of the vapor phase leaving the condenser.
ABC
Methane13.58968-3.72
propane13.711873-25.10
n-butane13.982292-27.86
(15 marks)Question 2In a separation process, a binary mixture of ethanol (1) and methy acetate consists of vapor and liquid phases in equilibrium at 390 K. The correlations for the activity coefficients and saturated pressure for the system are given as follows:
a) Prove that azeotrope condition exist at 390 K.b) Calculate the pressure and compositions of the system at the azeotrope condition.(10 marks)Question 3A feed containing equimolar amounts of acetone (1) and acetonitrile (2) is throttled to pressure of P and temperature of T. Assuming Raoults Law applies and two phases exista) Determine the pressure range at 323.15 K b) Determine the temperature range at 5 bar.(10 marks)
