Q$2.$ Answer the following questions:

a$)$ What are the basic environmental impacts of acetone production by using isopropyl alcohol $($IPA$)$ as the feedstock? Discuss them by considering impact categories.

b$)$ Which compounds can be recycled$/$reused$/$reduced in your acetone production project?

A liquid mixture containing $45$ mole$\%$ Benzene $($B$),20\%$ Toluene $($T$)$ and the balance Xylene $(x)$ is fed to a distillation column. The bottom product contains $94$ mole $\%x$ and no $B$ while $96\%$ of $x$ in the feed is recovered in this stream. The top product is fed to a second column. The top product from the second column contains $97\%$ of $B$ in the feed to this column. The composition of this stream is $94$ mole$\%$ B and the balance T$.$ Calculate the percentage of $T$ in the process feed that emerges in the bottom product from the second column.