Question: Question 4 (a) The stream from a gas well is a mixture containing 50mol% methane, 10mol% ethane, 20mol% propane, and 20 . mol-% n-butane. This

Question 4 (a) The stream from a gas well is a

Question 4 (a) The stream from a gas well is a mixture containing 50mol% methane, 10mol% ethane, 20mol% propane, and 20 . mol-\% n-butane. This stream is fed into a partial condenser maintained at a pressure of 17.24 bar, where its temperature is brought to 27C. (i) Determine the molar fraction of the gas that condenses' (ii) What are the compositions of the liquid and vapour phases leaving the condenser. [3.5 marks] (b) A mixture containing 15 -mol- % ethane, 35 -mol-\% propane, and 50 -mol-\% n-butane is brought to a condition of 40C at pressure P. If the molar fraction of liquid in the system is 0.40, (i) What is pressure P (in atm) ? [ atm=1bar=100kPa ] [9marks] (ii) What are the compositions of the liquid and vapour phases? [3.5 marks]

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