3/21/2024 0 Comments Depriester chart dew pointNote that if we start with a liquid of composition XB(L) and T heat to the bubble point we start to form a vapor with composition XB(V), which is rich in the volatile component. Txy Pconst Diagram Maximumtemperature azeotrope WHAT ARE THE DIFFERENCES AND SIMILARITIES ? ◦ If P further superheated vapour reqion. Combination of dew points dew line (or saturated vapour line). ◦ As P, more liquid will be evaporated until W dew point = the last drop of liquid disappear. ◦ The vapour V and the liquid L are in the equilibrium – both are connected through a tie line of VL. If all bubble points combined bubble line (or saturated liquid line). Starting with liquid point F, and moving vertically downwards along FG whereby P const T and composition: ◦ The first bubble appears L bubble point. Phase regions: ◦ Top region Subcooled / compressed liquid ◦ Bottom region Superheated vapour ◦ Intermediate region combination of liquid and vapour phase region or ?. Qualitative Behaviour of VLE PTxy of a binary system (= system with 2 components) shows VLE in a 3-D form. ◦ Gibbs energy for each phase is similar. Phase composition: ◦ Liquid composition xi ◦ Vapour composition yi Requirement for equilibrium: ◦ Both phases – L and V the same T and P. VLE problem determination of T, P or composition (xi or yi). Vapour Liqud Equilibrium (VLE) VLE equilibrium between liquid phase and vapour phase. Thermodynamic II VAPOUR-LIQUID EQUILIBRIUM Dr Darman Nordin & Dr Mohd Shahbudin Masdar
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