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Separator Design                                                333




            Minimum Number of Stages

                 log  (X LK /  XHK)D (XHK/ X LK)B
            N M =  ————————————————                                    (6.27.2)
                      log (a LK)av g

            Minimum Reflux

                      (Cti)avg  X iF
            I  _  q  — 2^  j  ——                                       (p.z  I ,j)
                           - 0

                         a
                              x
                        ( i)avg iD
            RM +  1 =  Z  i  ——————  —  where (a LK)av g  > 6 > (ocmOavg  (6.27.4)
                             -  9
            Optimum Reflux Ratio
            Ro   (1.6 -YO)
            —— = —————    (Xo -  7.5)  + 1.6                           (6.27.5)
            R M    6.5


            Y 0 = —————————————                                       (6.27.6)
                1.0614 (a LK)av g- 0.4175

                                             0 55 ( LK)av8
            X 0 = log  (X LK/X HK)D (XHK/X LK)B (xLK/x^p ' "          (6.27.7)

            Number of Equilibrium Stages

            Y e =l-Xe Be                                              (6.27.8)

            Y e = (N e -N M )/(N e +l)                                (6.27.9)

                                                                        T7
                                                                          1 (\\
              _
            "V"
                /"T>
                           \*^Q
            y^e — \K>Q  ~  D K-M  \ )  / ' /T?  4-  1 "\ *)           I' fi (D.ZI.L\J)
            B e = 0.105  log Xe +0.44                                 (6.27.11)





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