Flash Drums, Tie Lines, and the Lever Rule

14 The unit below treats a mixture of tetrachloromethane (CCI4) and chlorobenzene (C6H5CI) by flash distillation. 

Use the phase diagram for CCI4-C6H5CI mixtures below to determine the flow rate and composition of stream 4 leaving the flash drum shown on the following page. Also determine the pressure in the flash drum. 

Phase diagram for CCI4-C6H5CI mixtures at 40°C. Enlarged diagram available at www.cheme.comell.edu/ tmd/Graphs. 

Use the phase diagram for M-K mixtures to determine the compositions (mol fractions M and K) and flow rates (mol/min) of streams 3 and 4. (Justify briefly the number of significant figures in your answers.) Also, label on the M-K phase diagram the phases corresponding to each region and indicate the coordinates of (1) stream 1, (2) the vapor-phase stream, and (3) the liquid-phase stream. 

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