what is liquid- vapour equilibrium ?? explain with example
Answers
Explanation:
In thermodynamics and chemical engineering, the vapor–liquid equilibrium (VLE) describes the distribution of a chemical species between the vapor phase and a liquid phase. ... The equilibrium vapor pressure of a liquid is in general strongly dependent on temperature.
4 Phase equilibria
General equation for vapor-liquid equilibrium (VLE) of a particular mixture at constant low pressure, P, and temperature, T, is given by Eq.(8), where γi is the activity cofficient of component i, ϕi is the fugacity coeffcient, and xi and yi are mole fraction of i in liquid and vapor phase, respectively. Pisat is the component’s vapor pressure at temperature, T, and ϕisat is the fugacity coefficient of pure saturated vapor i at temperature, T, and the corresponding pressure, Psati.
(8)ϕiyiP=γixiPisatϕisat
To account for non-ideal vapor-liquid equilibrium (VLE) behavior of the quaternary solution, the activity coefficient of every component in the liquid phase was calculated using the UNIQUAC model with the binary interaction parameters obtained from Delgado et al., 2007. The vapor phase was assumed to be ideal; therefore, the fugacity coefficients of all the components in this phase are unity.
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In thermodynamics and chemical engineering, the vapor–liquid equilibrium (VLE) describes the distribution of a chemical species between the vapor phase and a liquid phase. ... The equilibrium vapor pressure of a liquid is in general strongly dependent on temperature.
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