EXAMPLE $8\mathrm{.}2($Single$-$stage extraction$)$ One thousand kilograms of an aqueous solution

containing $50\%$ acetone is contacted with $800kg$ of chlorobenzene containing $0\mathrm{.}5$ mass$\%$

acetone in a mixer$-$settler unit, followed by separation of the extract and the raffinate phases.

$($a$)$ Determine the composition of the extract and the raffinate phases and the fraction of acetone

extracted. $($b$)$ Also calculate the amount of solvent required if $90\%$ of the acetone is to be

removed. Equilibrium and tie line data are given below.

Ans. $($a$)y_c=0\mathrm{.}302$;$x_c=0\mathrm{.}236$; Fraction of acetone extracted: $71\mathrm{.}7\%($b$)$ Solvent, $B=4027kg.$