Explain Vapour Liquid Equilibrium (VLE).
An activity coefficient is a factor used in thermodynamics to account for deviations from ideal behaviour in a mixture of chemical substances. In an ideal mixture, the microscopic interactions between each pair of chemical species are the same (or macroscopically equivalent, the enthalpy change of solution and volume variation in mixing is zero) and, as a result, properties of the mixtures can be expressed directly in terms of simple concentrations or partial pressures of the substances present e.g. Raoult's law. Deviations from ideality are accommodated by modifying the concentration by an activity coefficient. Analogously, expressions involving gases can be adjusted for non-ideality by scaling partial pressures by a fugacity coefficient.
What is Duhem’s Theorem?
For any closed system formed from known amounts of prescribed chemical species, the equilibrium state is completely determined when any two independent variables are fixed. The two independent variables subject to specification may in general be either intensive or extensive. However, the number of independent intensive variables is given by the phase rule. Thus when F = 1, at least one of the two variables must be extensive, and when F = 0, both must be extensive.
How to Calculate Fugacity Coefficient using Gamma-Phi Formulation of VLE?
Fugacity Coefficient using Gamma-Phi Formulation of VLE calculator uses Fugacity Coefficient = (Mole Fraction of Component in Liquid Phase*Activity Coefficient*Saturated pressure)/(Mole Fraction of Component in Vapor Phase*Total Pressure of Gas) to calculate the Fugacity Coefficient, The Fugacity Coefficient using Gamma-Phi Formulation of VLE formula is defined as the ratio of the product of the liquid phase mole fraction, activity coefficient and the saturated pressure to the product of the vapour phase mole fraction and the total pressure of mixture or solution. Fugacity Coefficient is denoted by ϕ symbol.
How to calculate Fugacity Coefficient using Gamma-Phi Formulation of VLE using this online calculator? To use this online calculator for Fugacity Coefficient using Gamma-Phi Formulation of VLE, enter Mole Fraction of Component in Liquid Phase (xLiquid), Activity Coefficient (γ), Saturated pressure (Psat ), Mole Fraction of Component in Vapor Phase (yGas) & Total Pressure of Gas (PT) and hit the calculate button. Here is how the Fugacity Coefficient using Gamma-Phi Formulation of VLE calculation can be explained with given input values -> 0.423131 = (0.51*1.5*50000)/(0.3*102100).