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 Total Pressure using Gamma-Phi Formulation of VLE?
Total Pressure using Gamma-Phi Formulation of VLE calculator uses Total Pressure of Gas = (Mole Fraction of Component in Liquid Phase*Activity Coefficient*Saturated pressure)/(Mole Fraction of Component in Vapor Phase*Fugacity Coefficient) to calculate the Total Pressure of Gas, The Total Pressure 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 fugacity coefficient of mixture or solution. Total Pressure of Gas is denoted by PT symbol.
How to calculate Total Pressure using Gamma-Phi Formulation of VLE using this online calculator? To use this online calculator for Total Pressure 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) & Fugacity Coefficient (ϕ) and hit the calculate button. Here is how the Total Pressure using Gamma-Phi Formulation of VLE calculation can be explained with given input values -> 134210.5 = (0.51*1.5*50000)/(0.3*0.95).