Estimation of diffusivity in a dilute liquid mixture

Example 2.17 Estimation of diffusivity in a dilute liquid mixture Estimate the diffusivity of ethanol in a dilute 

Assume that the mixture is a dilute solution. Use the Wilke-Chang equation  

The molar volume of ethanol at its boiling point can be estimated from the Rackett equation 

The association parameter for solvent water is f = 2.6. Using the Wilke-Chang equation, we find 

On dissociation of a salt, ions start to diffuse in a solution. Without an electric potential effect, however, the diffusion of a single salt is treated as molecular diffusion. For dilute solutions of a salt, the Nemst-Haskell equation is used to estimate the dilfusivity coefficient 

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Example 2.17 Estimation of diffusivity in a dilute liquid mixture Estimate the dilTusivity of ethanol in a dilute solution of ethanol-water at 25°C. The density of ethanol is 0.79 g/cm and the viscosity of water at 25°C is 0.95 cP. 

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