quiz1-key - CHE 4253 Quiz 1 Instructor Dimitrios V...

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CHE 4253 - Quiz 1 Instructor: Dimitrios V. Papavassiliou September 19, 2006 Name:………………………. OU ID:……………………… Answer all questions and show your calculations, if any are necessary. 1. (10 points) Assume a two-phase equilibrium flash column. Assume that there are N c components in the inlet stream, and that the inlet conditions (i.e., temperature, pressure and total flow rate) are known. (a) How many variables are there for each stream? How many variables total for the system of the column with the streams? (b) How many degrees of freedom are there for this column? (Assume that in addition to writing down the mass balance equations, you know the inlet composition of the feed stream F, you know the thermodynamics [i.e., the phase equilibrium correlations for each one of the N c components], you know that T V = T L , and P V =P L , and that you know that = 1 F x , = 1 V x , and = 1 L x , where x is the molecular fraction in each stream.) (c) If the column is known to be adiabatic, how many degrees of freedom do you have now (assuming everything in (b) above)? (a)
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quiz1-key - CHE 4253 Quiz 1 Instructor Dimitrios V...

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