A charge of 50 mole of a mixture of benzene and chlorobenzene having 55 mol% of the less volatile is to be batch distilled. (a) if 25 moles of the solution is vaporized and condensed as the distillate, calculate the concentration of the accumulated distillate. (b) if the concentration of the accumulated product is found to be 72 mol% benzene, calculate its amount. The relative volatility of benzene in the mixture is 4.15
Answers
Benzene is an organic chemical compound with the chemical formula C₆H₆. The benzene molecule is composed of six carbon atoms joined in a ring with one hydrogen atom attached to each. As it contains only carbon and hydrogen atoms, benzene is classed as a hydrocarbon
Formula: C6H6
Molar mass: 78.11 g/mol
Boiling point: 80.1 °C
IUPAC ID: Benzene
Density: 876 kg/m³
Answer:
Problem Statement:
A batch distillation unit is charged with 100 mol of a 60 mol% benzene - 40 mol% toluene mixture which has a relative volatility of 2.6. What is the mole fraction of benzene in the liquid when half of the liquid has been distilled and what is the mole fraction of the benzene in the collected distillate?
Background:
In a batch distillation process like that shown at the left, a liquid mixture is charged to the still, which is then heated to the bubble point. At any given instant, the composition of the vapor can be considered in equilibrium with the liquid, but the vapor phase is condensed and taken off as product. Because this vapor, which is rich in the more volatile component, is removed from the system, the liquid remaining behind in the still is enriched in the less volatile component. This means that the bubble-point temperature of the remaining liquid increases slightly and the new vapor that comes off will still be enriched in the more volatile component, although not quite as much as the previous vapor removed. The more of the liquid that is distilled, the higher will be the composition of the less volatile component remaining in the distillation pot.
Explanation:
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