Lecture_6a_4e

On the other hand if the boiling is allowed to

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Unformatted text preview: y at the boiling point and the liquid and vapor will come to equilibrium. Ÿ On the other hand, if the boiling is allowed to continue and the vapor is continuously removed, the temperature will rise. When it reaches θ1, the liquid composition is given by the point R and the vapor in equilibrium with it will have the composition denoted by the point D. Ÿ If we continue this process of removing the vapor, the liquid will eventually consist of pure component 1, all of component 2 having been removed as vapor. Ÿ If the vapor removed at each stage is allowed to condense to liquid and is boiled again, eventually, the condensate will reach the composition of pure component 2 (D → l′ → v′ → l″ → v″→.....) Ÿ This is the principle behind the separation technique known as distillation. Azeotropes: Positive Deviation from Raoult’s Law → Minimum boiling point mixtures. Fig. 5.8 Fig. 6.9 Negative Deviation from Raoult’s Law → Maximum boiling point mixtures: Fig. 5.9 Fig. 6.10 Azeotropes satisfy two conditions: 1. They boil at temperatures less than either of the pure compon...
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This document was uploaded on 02/28/2014 for the course CHEM 311 at LA Tech.

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