A simple beer column processes a waterethanol mixture (15% w/w ethanol). The distillate is 80% w/w ethanol and the residue is 98% water.

The condenser consumes 20.19 kg/s of cooling water at 20C, which exits at 30C. The reboiler consumes 0.929 kg/s of steam (λ51800 kJ/kg).

Calculate the mass flow of distillate and residue, the L/D reflux ratio, and the number of trays if their efficiency is 75% (Fig. P8.7).

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