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Problem 12.11: The laboratory division of your company has sent you the following data for the system n-pentane (1) propionaldehyde (2) at 35 °C: The activity coefficients of the two components at infinite dilution are 4.0 and the saturation pressures of the pure components are 0.7 and 1 bar, respectively. a) Does this system exhibit positive, negative, or no deviations from ideal-solution behavior? b) Assuming the validity of the Margules equation, determine the constants A12 and A21 . c) You suspect that this system forms an azeotrope. What is the composition of the two phases and the pressure at the azeotrope? d) Draw a qualitative Pxy graph at 35 °C. On the graph show all the information that you have for this system. e) Your are designing a single flash separation process for a stream that contains 45% n-pentane (the rest is propionaldehyde). The mixture is to be flashed at 35 °C and you must determine the pressure so that the purity of n-pentane is 95%. What is this pressure?
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