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What is its dew point? What is the composition of the first drop? boiling range bubble point 圎,initial yE,initial 3. 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. 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 Read this K-value off the chart (approximately 21.3).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. Note where the line crosses the methane axis.Connect the points with a straight line.On the right-hand vertical axis, locate and mark the point containing the temperature 60☏.On the left-hand vertical axis, locate and mark the point containing the pressure 100 psia.Example įor example, to find the K value of methane at 100 psia and 60 ☏. Many DePriester charts have been printed for simple hydrocarbons. "K" values, representing the tendency of a given chemical species to partition itself preferentially between liquid and vapor phases, are plotted in between.
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These nomograms have two vertical coordinates, one for pressure, and another for temperature. DePriester in an article in Chemical Engineering Progress in 1953. DePriester Charts provide an efficient method to find the vapor-liquid equilibrium ratios for different substances at different conditions of pressure and temperature.