Consider a superheated binary vapor that is 40 mol% ethanol. What is its bubble point? What is the composition of the first bubble? dew point 2. Consider a sub-cooled binary liquid that is 40 mol% ethanol. Pure liquids have a boiling point mixtures have a boiling range, delimited by their bubble point and dew point.
Wankat (ISBN: ) Copyright © 2012 Pearson Education, Inc. Figure 2-3 Temperature-composition diagram for ethanol-water From Separation Process Engineering, Third Edition by Phillip C.A subcooled liquid feed of composition zA, heated to temperature TA, will separate spontaneously into 2 phases, of composition xA and yA Lecture 2 ends in the middle of this slide zA.yA superheated vapor subcooled liquid 2-phase region saturated vapor line saturated liquid line TA xA How big should the drum be? What height should the nozzle be? What T and P should the drum be? What T and P should the feed be?Ĭonsider a binary (i.e., 2-component) system with 2-phases: What do we know? yA + yB = 1 xA + xB = 1 yA ≠ xA Tvap, Pvap yA, yB Tliq, Pliq xA, xB At equilibrium: Tvap = Tliq Pvap = Pliq Gibbs’ Phase Rule: degrees of freedom = # components (C) - # phases (P) + 2 For a binary, 2-phase system: 2 – = 2 We can specify only 2 intensive variables (all others are fixed, by VLE)ģ Specify P and T 2 graphs in one: T vs.
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