Enter your Calculation Type, Temperature, Pressure, and up to your desired Number of Components — including each Component Name and its Mole Fraction — and this Flash Calculation Calculator solves the vapor-liquid equilibrium to give you the Vapor Fraction, Liquid Fraction, and the K-values for each component in your mixture.
Vapor Fraction
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Liquid Fraction
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K-value Component 1
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K-value Component 2
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A flash calculation determines the vapor-liquid equilibrium for a multicomponent mixture at specified temperature and pressure conditions. It calculates how much of each component will be in the vapor phase versus the liquid phase.
The Peng-Robinson EOS is a cubic equation of state used to predict thermodynamic properties of pure components and mixtures. It's particularly accurate for hydrocarbons and is widely used in petroleum and chemical industries for phase equilibrium calculations.
K-values (equilibrium ratios) represent the ratio of a component's mole fraction in the vapor phase to its mole fraction in the liquid phase. K = yi/xi, where yi is vapor mole fraction and xi is liquid mole fraction.
Bubble point is the temperature or pressure at which the first vapor bubble forms from a liquid mixture. Dew point is the temperature or pressure at which the first liquid drop forms from a vapor mixture.
Binary interaction parameters (kij) account for molecular interactions between different components in a mixture. They improve the accuracy of equation of state predictions, especially for non-ideal mixtures with significant intermolecular forces.
PT flash is a calculation performed at specified pressure and temperature to determine the vapor fraction and composition of each phase. It's the most common type of flash calculation in process simulation.
VLE is fundamental to separation processes like distillation, absorption, and extraction. Understanding phase behavior helps engineers design efficient separation equipment and optimize operating conditions for maximum product purity and energy efficiency.