A mixture of $i-C_4,n-C_4,i-C_5,n-C_5$ and $n-C_6$ is to be separated in a distillation column. The recovery of $n-C_4$ in the distillate is $98$mol$\%$ and the recovery of $i-C_5$ in the bottom product is also $98\%.$ The feed temperature is $T_F=90C$ and the feed pressure is $6$ bar.

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