There is 60 ppm of water in toluene saturated with water at 30 degrees, so it is intended to be dried to 0.5 ppm water b

[answerhappygod]

There is 60 ppm of water in toluene saturated with water at 30 degrees, so it is intended to be dried to 0.5 ppm water by fractional distillation. The feedstock enters the top end of the tower. The overhead vapor condenses and cools to 30°C, where it splits into two layers. The water layer is discarded, and the toluene layer saturated with water is recycled. The average relative volatility of water to toluene is 120. If 0.25 mol of steam is used per 1 mol of liquid raw material, how many theoretical plates are needed? (Ignore the L/V change in the tower)