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X A + x B = 1 - Consider the process in the figure: we start with a mixture of composition 1 and temperature T1 and start increasing the temperature Thermodynamic calculations using K-values Bubble point - Model system: binary mixture A, B X* Easy for 2 component system, if T-x-y diagram is available (remember the lever rule?) What about the multi-component system? Thermodynamic calculations using K-values P Grafik menunjukkan hubungan nilai K untuk suatu komponen dengan suhu dan tekananĬampuran terdiri n-hexane, n-heptane, noctane dan n-nonane pada suhu 40C dan 500 kPaīubble point is the condition that the first bubble formed during liquid mixture boiled Dew point is the condition that the first drop formed during vapor mixture cooled Persamaan Antoine dan koefisien dinyatakan dalam beberapa bentuk:ĭata koefisien Antoine dapat dilihat di Chemical Engineering Vol 6 Persamaan Antoine memberikan hubungan tekanan uap murni (P atau VP) suatu senyawa/komponen dengan suhu. K i = Pi / P Relative volatility for ideal gas/ideal solution system: s Pi = yi P K-value for ideal gas/ideal solution system: s Pi is the partial pressure of component i Thermodynamic data for mixtures: Simplified models V Ki = yi/xi correlated empirically or theoretically in terms of temperature pressure and composition The ratio of two K-values, or relative volatility, indicates the relative ease or difficulty of separating components i and j Thermodynamic considerations and phase equilibria: multicomponent mixtures For multicomponent mixtures simple graphical representations of vapour-liquid equilibria data do not exist Most often such data (including binary systems) is represented in terms of K values defined as:
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Penya enyajian jian Data Data Keset Kesetimbang imbangan an (presenting (presenting equilibrium data)