There are 300 kg/h of an aqueous dilution of acetic acid with a composition of 40% by weight of acid. They are countercu

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There are 300 kg/h of an aqueous dilution of acetic acid with a
composition of 40% by weight of acid. They are countercurrently
extracted with isopropyl ether to produce the acid concentration in
the raffinate at 6% by weight. Assuming a quantity of 465 kg/h of
solvent, calculate:
a) The number of theoretical stages required
b) The weights of the extract and the refined
c) The compositions of all the substances of the refined extract
and point