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HW7 ChE 150B F2009

# HW7 ChE 150B F2009 - ChE 150B Problem Set 7 Due Problem...

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ChE 150B Problem Set 7 Due October 16, 2009 Problem 1. (10 points) Consider an adiabatic equilibrium flash. The variables are all as indicated in Figure 1 below. (a) Determine the number of variables. (b) Write all the independent equations that relate the variables. (c) Determine the number of equations. (d) Determine the number of degrees of freedom. (e) What variables would you prefer to specify in order to solve a typical adiabatic flash problem? Figure 1. Conditions for Problem 1. Problem 2. (40 points) A liquid mixture containing 25 mol% benzene and 75 mol% ethyl alcohol, which components are miscible in all proportions, is heated at a constant pressure of 1 atm (101.3 kPa, 760 torr) from a temperature of 60°C to 90°C. Using the following T-x-y experimental data, perform calculations to determine the answers to parts (a) through (f). EXPERIMENTAL T-x-y DATA FOR BENZENE-ETHYL ALCOHOL AT 1 ATM Temperature °C: 78.4 77.5 75 72.5 70 68.5 67.7 68.5 72.5 75 77.5 80.1 Mole percent benzene in vapor: 0 7.5 28 42 54 60 68 73 82 88 95 100 Mole percent benzene in liquid: 0 1.5 5 12 22 31 68 81 91 95 98 100 (a) At what temperature does vaporization begin?

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