Batch distillation of acetone and propylacetate: The relative volatility is 4.74, and we have 100 kmol of feed with an acetone mole fraction of 0.4. Acetone is more volatile.

We have 3 trays that we can add to the still pot, and we can run at a constant distillate mole fraction. The final residue acetone mole fraction is 0.20. Use an average distillate mole fraction of 0.90.

What will be the starting and ending reflux ratios? How much distillate will we produce?