A mixture of water and ammonia is distilled in an ordinary distillation system (Figure 3-8) at a

Question:

A mixture of water and ammonia is distilled in an ordinary distillation system (Figure 3-8) at a pressure of $6 \mathrm{~kg} / \mathrm{cm}^{2}$. The feed is $30 \mathrm{wt} \%$ ammonia at $20^{\circ} \mathrm{C}$. Distillate product is $98 \mathrm{wt} \%$ ammonia with a $95 \%$ recovery of ammonia in the distillate. The external reflux ratio is $\mathrm{L}_{0} / \mathrm{D}=$ 2.0. Reflux is returned at $-20^{\circ} \mathrm{C}$. Find $D, B, x_{B}, Q_{R}$, and $Q_{c}$ per mole of feed.

image text in transcribed