Question

Flash distillation

A still is charged with 1000 moles of a 58.5 mole % methanol(M) and 41.5 mole % 1-propanol mixture. This mixture is distilled until 200 moles remain in the still and the cumulative distillate collected. You may assume that the relative volatility is 3.6 and it remains the same during the distillation process.

a) What are the feed and distillate flow rates during the process?

b) For the flas option, determine the equilibrium distillate and bottoms compositions

c) At what temperature does the flash tank operate?

d) What would you recommend, batch or flash? why?

Answer 1