Fugacity: It is derived from Latin, expressed as fleetness or escaping ...

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Phase Diagram for Binary solution Constant pressure equilibrium Consider a Binary system made up of component A and B. Where it is assumed to be more volatile than B where vapour pressure ‘A’ is more than ‘B’. When the pressure is fixed at the liquid composition can be changed the properities such as temperature and vapour compositions get quickly determined VLE at constant pressure is represented on T-xy diagram. Boiling point diagrams When temperature is plotted against liquid(x) and vapour(y) phase composition. The upper curve gives and lower curve gives. The lower curve is called as bubble point curve and upper curve is called as Dew point curve. The mixture below bubble point is sub cooled liquid and above the Dew point is super heated vapour. The region between bubble point and Dew point is called mixture of liquid and vapour phase. Consider a liquid mixture whose composition and temperature is represented by point ‘A’. When the mixture is heated slowly temperature rises and reach to point ‘B’, where the liquid starts boiling, temperature at that point is called boiling point of whether heating mixture reaches to point ‘G’ when all liquids converts to vapour the temperature at that point is called as Dew point. Further heating results in super heated vapour. The number of tic lies connects between vapour and liquid phase. For a solution the term boiling point has no meaning because temperature varies from boiling point to Dew point at constant pressure.
Effect of pressure on VLE The boiling point diagram is drawn from composition x=0 to x=1, boiling point of pure substances increases with increase in pressure. The variation of boiling point diagrams with pressure is as shown in diagram. The high pressure diagrams are above low pressure.
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