We desire to separate $1,2$ dichloroethane from $1,1,2$ trichloroethane at one atmosphere. The feed is a saturated liquid and is $60\mathrm{.}0$ mole$\%1,2$ dichloroethane. Assume the relative volatility is approximately constant $)=(2\mathrm{.}4.$ If analysis using the Fenske and Underwood equations result with minimum number of stages around $10$ stages $)=(10,$ and minimum internal reflux ratio $(\frac{L}{V}{)}_{\text{m}\text{i}\text{n}}=0\mathrm{.}5$; using the Gilliland correlation for $R(\frac{L}{D})=1\mathrm{.}5,$ the actual number $(N)$ of equilibrium stages are nearly

Figure $7-3$ Gilliland correlation as modified by Liddle $(1968)$;

$8$

Reprinted with permission from Chemical Engineering ;

$14$

$18$

$24$