# L15 - Lecture 15 Plate construction 2nd Method(Distillation...

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Lecture - 15 Plate construction: 2nd Method (Distillation Analogy) 5. After finding , draw random lines from ( , x ) to the 2-phase region A Va La Operating line Ys+1 xs ya ys+1 xa xs S D xa Tie line

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6. Draw Equilibrium Curve in x a - y a diagram 7. Draw operating line from (x s , y s+1 ) generated in step 5 8. Draw stages, (like in absorption). This method is more time consuming than method 1. Computer Method 1. Given: Feed conc. & flow rate, solvent conc. & flow rate, solute concentration in raffinate Equilibrium curves, # of stages… 2. Determine an equation for the saturated extract curve: y d =f ext (y a ) Va A Determine an equation for saturaed raffinate curve: x d =f raf (x A ) S D
3. Determine an equation to fit tie-line data: y a =t tie (x a ) 4. Determine all inlet/outlet conc. & flow rates. Find Lb, Va, y aD , x d Solve L a + V b = L b + V a L a x aA + V b y bA = L b x bA + V a y aA L a x aD + V b y bD = L b x bD + V a y aD x D = f raf (x A ) y D = f ext (y A ) Get ( , x ): x A = (L a x aA - V a y aA )/(L a - V a ) 4. From x bA , get y NA from: y A = f tie (x A ) yn x

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