3.) How many simple distillations would produce the same result in Question 2.)?

Question

3.) How many simple distillations would produce the same result in Question 2.)?

Each step is equivalent to a simple distillation. The graph shows that starting with a mixture that is 20% cyclohexane and 80% toluene, a fractionation column having an efficiency equal to three theoretical plates would be needed to result in distillate that is 95% pure. A fourth theoretical plate would result in distillate that is about 99% pure cyclohexane. BOILING POINT- COMPOSITION CURVE MOI 90 Cyclohexane 100 90 80 70 60 50 40 30 20 10 0 115 110 u 105 100 Vapor 90 F 85 80 75 Liquid 0 10 20 30 40 50 60 70 80 90 100 M0196 Toluene >

Explanation / Answer

2) Starting at the x-axis at the 15 cycl / 85 tol point, draw a line straight up to the liquid curve (the bottom curve). Draw ) a straight horizontal line over to the vapor curve (the top curve) and back down to the liquid curve.

This is where your second fraction starts. Now draw a line from there over to the vapor curve, and back down to the liquid curve.

For your third fraction, draw another line across from the liquid to the vapor curve, then down to the x-axis.

Now check - are you at the 90 cycl / 10 tol point? If not, draw do a fourth fraction.

Therefore, 3 plates for the fractional. However, your simple distillation number will be the same as your theoretical plates. Each step on your fractional is equal to a simple distillation.

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