ChE 501 Fall 2015 HW Assignment 17 Solution

# ChE 501 Fall 2015 HW Assignment 17 Solution - ChE 501 Fall...

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ChE 501 Fall 2012 HW Assignment 17 Solution 1. Find the dew-point temperature at one atmosphere pressure of a vapor made up of 50 mol % toluene and benzene by a) the t- xy diagram and b) Roault’s law and Antoine’s equation. Txy: 99 o C Antoine’s equation data from Table B.4: Benzene A = 6.89272 B = 1203.531 C = 219.888 Toluene A = 6.95805 B = 1346.773 C = 219.693 1 10 760 5 0 10 760 5 0 1 693 219 773 1346 95805 6 888 219 531 1203 89272 6 . T . . . T . . T B B B T B . . P P y P P y x x Using Excel, I find T = 98.7 o C. 2. Find the bubble-point temperature at one atmosphere pressure of a liquid made up of 50 mol % toluene and benzene by a) the t- xy diagram and b) Roault’s law and Antoine’s equation. Txy: 91 o C 760 10 5 0 10 5 0 1 693 219 773 1346 95805 6 888 219 531 1203 89272 6 . T . . . T . . T B B B . . P x P x P Using Excel, I find T = 92.1 o C. 3. A liquid mixture of 65 mol % n -nonane and 35 mol % n -octane enters a flash unit. In the flash unit, the pressure is reduced to 1.00 atm, and half of the liquid is evaporated.

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