Acetic acid (A) - water (B) mixture containing 35 wt% acetic acid and flow rate of 500 kg/h, using a minimum amount of isopropyl ether extracted in a multistage extraction unit operating according to the countercurrent principle until 5 wt% acetic acid remains in the raffinate phase is being produced. If solvent is used in the extraction process at a flow rate of 1.59 times the flow rate of the minimum solvent;

a) The amount and composition of the extract and raffinate phases at the end of the process. b) The theoretical number of equilibrium steps required for the process.

\begin{tabular}{|c|c|c|c|c|c|} \hline \multicolumn{3}{|c|}{ Rafinat faz (arlk \%'si) } & \multicolumn{3}{c|}{ Ekstrakt faz (arlk \%'si) } \\ \hline A & B & S & A & B & S \\ \hline 0 & 98.8 & 1.2 & 0 & 0.6 & 99.4 \\ \hline 0.69 & 98.1 & 1.2 & 0.18 & 0.5 & 99.3 \\ \hline 1.41 & 97.1 & 1.5 & 0.37 & 0.7 & 98.9 \\ \hline 2.89 & 95.5 & 1.6 & 0.79 & 0.8 & 98.4 \\ \hline 6.42 & 91.7 & 1.9 & 1.93 & 1.0 & 97.1 \\ \hline 13.3 & 84.4 & 2.3 & 4.82 & 1.9 & 93.3 \\ \hline 25.5 & 71.1 & 3.4 & 11.4 & 3.9 & 84.7 \\ \hline 36.7 & 58.9 & 4.4 & 21.6 & 6.9 & 71.5 \\ \hline 44.3 & 45.1 & 10.6 & 31.1 & 10.8 & 58.1 \\ \hline 46.4 & 37.1 & 16.5 & 36.2 & 15.1 & 48.7 \\ \hline \end{tabular}