HW7 - Chemical Engineering 150B Fall 2005 Problem Set#7 Due...

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Page 1 of 3 Chemical Engineering 150B- Fall 2005 Problem Set #7 Due Wednesday October 19 th , 2005 Note: There are 4 problems in this assignment (see both pages). Problem 1. (15 Points) Consider an adiabatic equilibrium flash with a high pressure liquid feed that is separated into liquid and vapor streams at lower pressure. The variables are all as indicated in the following figure: There are C components in equilibrium, and thus all of your answers to the below questions will have C as part of the expression. (a) Both extensive and intensive variables are listed in the figure. Express the total number of variables in terms of C. (b) Write all the independent equations that relate the variables. You may simply write your answer as "one energy balance, three vapor-liquid equilibrium equations, etc." (c) Express the total number of equations in terms of C. (d) Determine the number of degrees of freedom in terms of C. (e) What variables in (a) would you think to be most likely as being fixed by the process for which you are designing the flash unit? Problem 2. (20 Points) Saturated liquid feed, of F= 40 mol/h, containing 50 mol% A in B is supplied continuously to the apparatus shown below: The condensate from the condenser is split so that half of it is returned to the still pot. The still pot can be assumed to be an equilibrium stage.
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