Analytical equations for the number of transfer units (NTU) for multicomponent packed column systems at total reflux have been derived. These expressions are the packed column equivalents of Fenske’s equation for staged columns. Two cases are considered in this paper : 1) all mass transfer resistance is assumed to occur in the vapor phase and 2) all mass transfer resistance is assumed to occur in the liquid phase. Using a characterizing parameter (C), it is seen that the distribution ratios of the nonkey components in a given system differ for both packed column cases, which in turn differ from the staged column case. Finally, it is shown that some nonvolatile component may be overheaded in the case where all mass transfer resistance is in the vapor phase, while some component of infinite volatility may be bottomed in the case where all mass transfer resistance is in the liquid phase.