$11\mathrm{.}23$ A wet organic pigment containing $40\%CC{l}_4$ is to be dried to $5\%.$ The drier can handle only $200k\frac{g}{h}$ of dry solid. The air used for drying is obtained by mixing fresh air with recycled air. The fresh air is essentially free of $CC{l}_4$ and it enters the dryer at $373K$ and $101\mathrm{.}3$kPa with a dew point $288K$ for $CC{l}_4.$ The air leaving the drier has a $CC{l}_4$ dew point of $298K.$ Calculate:

$($a$)$ The fresh air to be supplied to the drier $(k\frac{g}{h})130\mathrm{.}16k\frac{g}{h}$

$($b$)$ The recycle ratio, $CC{l}_4-$free basis $0\mathrm{.}838kg$ ghy ais

The vapour pressure of $CC{l}_4$ at $288K=7\mathrm{.}60$kPa and at $298K=15\mathrm{.}3$kPa