Page 22 - Distillation theory
P. 22

P1: FCH/FFX  P2: FCH/FFX  QC: FCH/FFX  T1: FCH
            CB644-FM   CB644-Petlyuk-v1                                                          June 15, 2004  4:28





                        xx     Nomenclature

                               m                        number of stationary points of bond chain
                               n                        number of components in a mixture
                               N                        number of equilibrium stages
                                +
                               N or N −                 stable or unstable node respectively
                                +
                               N or N −                 stable or unstable node of overhead boundary
                                D     D
                                                          element of concentration simplex or of
                                                          distillation region respectively
                                +
                               N or N −                 stable or unstable node of bottom boundary
                                B     B
                                                          element of concentration simplex or of
                                                          distillation region respectively
                                +
                               N or N r −               stable or unstable node of rectifying trajectory
                                r
                                                          bundle respectively
                               N or N s −               stable or unstable node of stripping trajectory
                                +
                                s
                                                          bundle respectively
                               N or N −                 stable or unstable node of extractive trajectory
                                +
                                e     e
                                                          bundle respectively
                               P                        pressure, Pa
                               q                        fraction of liquid in feed
                               Q                        heat flow rate, kJ/sec or kcal/sec
                               qS                       quasisaddle
                               R                        reflux ratio
                                                        minimum reflux ratio
                               R min
                               R 1  or R 2              first or second boundary minimum reflux ratio
                                lim   lim
                                                          respectively
                               R t  or R t              minimum or maximum reflux ratio for trajectory
                                min    max
                                                          tear-off respectively
                               Reg                      region
                                 ijk
                               Reg ord                  component order region
                                  (k)      (k)     (k)
                               Reg   or Reg  or Reg     k-component possible overhead or bottom or
                                  D        B       D,E
                                                          overhead-entrainer product region respectively
                                 j       j       j
                               Reg or Reg or Reg        i-present components and j-absent components
                                  D       B       D,E
                                 i      i        i        possible overhead or bottom or overhead-
                                                          entrainer product region respectively
                                   j           j
                               Reg      or Reg          boundary of possible overhead or
                                  bound,D     bound,B
                                   i    j      i
                                 or Reg bound,D,E         bottom or overhead-entrainer product region
                                        i                 respectively, i-present components, and j-absent
                                                          components
                               Reg t(k)  or Reg t(k)  or Reg t(k)  k-component tear-off region of rectifying or
                                  r
                                                    e
                                           s
                                                          stripping or extractive section respectively
                               Reg ∞                    distillation region at infinite reflux
                               Reg ∞    , Reg ∞         top or bottom boundary element of distillation
                                  bound,D   bound,B
                                                          region at infinite reflux respectively
                               Reg min,R , Reg min,R    separatrix min-reflux region for rectifying or
                                  sep,r    sep,s
                                                          stripping section for given reflux R respectively
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