Question 3: At a plant that manufactures styrene, the...

Question 3: At a plant that manufactures styrene, the reactor is run at 1.2 atm and 400 C. The outlet of the reactor contains 50 mol% H$_2$, 20 mol% ethylbenzne (C$_8$H$_{10}$), and 30 mol% styrene (C$_8$H$_8$). The reactor outlet is cooled and partially condensed, and the vapor and liquid are separated into vapor and liquid streams in an equilibrium flash drum. The hydrogen-rich vapor stream must contain no more than 0.2 mol% styrene? a) State any assumptions you make. b) Show that the reactor outlet stream should be cooled to (approximately) 12.4 C to achieve this separation. c) What is the liquid stream composition?

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A pressurized liquid stream of 40 mole% acetone in acetic acid flowing at 150 mol(e)/(m)in is to be upgraded by removing some acetone in a flash drum operating at 1100 mmHg and 100°C. a) Determine the equilibrium acetone vapor and liquid compositions from dew- and bubble-point calculations. b) Using appropriate balances on the flash drum, find the liquid and vapor exit flowrates. What is the purity of the main acetic acid stream, and what is the fractional recovery of acetone in the waste stream? c) What is the relative volatility ratio (α = Psat,acetone / Psat,acetic acid) at this temperature? d) What change in flash drum operating conditions would improve its performance? (Address both P and T in your answer.) For acetone, Psat in mmHg = 7.02447 - (1161.0) / (T + 224.0) For acetic acid, Psat in mmHg = 7.38782 - (1533.313) / (T + 222.3) At a plant that manufactures styrene, the reactor is run at 1.2 atm and 400°C. The outlet of the reactor contains 50 mol% H2, 20 mol% ethylbenzene (C8H10), and 30 mol% styrene (C8H8). The reactor outlet is cooled and partially condensed, and the vapor and liquid are separated into vapor and liquid streams in an equilibrium flash drum. The hydrogen-rich vapor stream must contain no more than 0.2 mol% styrene. a) State any assumptions you make. b) Show that the reactor outlet stream should be cooled to (approximately) 12.4°C to achieve this separation. c) What is the liquid stream composition? Question 3: At a plant that manufactures styrene, the reactor is run at 1.2 atm and 400°C. The outlet of the reactor contains 50 mol% H2, 20 mol% ethylbenzene (C8H10), and 30 mol% styrene (C8H8). The reactor outlet is cooled and partially condensed, and the vapor and liquid are separated into vapor and liquid streams in an equilibrium flash drum. The hydrogen-rich vapor stream must contain no more than 0.2 mol% styrene. a) State any assumptions you make. b) Show that the reactor outlet stream should be cooled to (approximately) 12.4°C to achieve this separation. c) What is the liquid stream composition?

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