Question $2$: $13$D$1($Wankat$,2017)$

A feed of $100\mathrm{.}0k\frac{g}{m}in$ of a $1\mathrm{.}2wt\%$ mixture of acetic acid in water is to be extracted with

$1-$butanol at $1$atm pressure and $26\mathrm{.}7C.$ We desire an outlet concentration of $0\mathrm{.}1wt\%$

acetic acid in the exiting water. We have available solvent stream $1$ that is $44\mathrm{.}0k\frac{g}{m}in$ of

pure $1-$butanol and solvent stream $2$ that is $30\mathrm{.}0k\frac{g}{m}in$ of $1-$butanol that contains $0\mathrm{.}4$

$wt\%$ acetic acid. Determine if the following alternatives $($to the example$)$ are capable of

producing outlet water of desired acetic acid concentration.

a$.$ Use only pure solvent at bottom of extractor.

b$.$ Mix all of pure and all of impure solvent together and use at bottom of the column.

c$.$ Mix all of pure and part of impure solvent together and use at bottom of column.