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By Kennard E.H.

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Extra resources for Entropy, Reversible Processes and Thermo-Couples

Sample text

The ratio of the volume fraction of component i, cpj, and the mole fraction X1 can be written as Oi rg/Mj WI £ rjWj/Mj j (3C 16) ' This expression will be finite at infinite dilution of solvent (lim X 1 -* O). Similarly, the ratio of the molecular surface area fraction, 0j, and the molecular volume fraction, Cp1, can be written as 0, 0i = VrjWj/Mj i (3C-17) w /M 5>i i i i This expression will also be finite at infinite dilution. In some cases mole fraction activity coefficients will be needed. expression can be used to calculate mole fraction activity coefficients, y\> InKi = I n Q i + I n L L £ i ^i] The following < 3C - 18 > Mj .

M (number of components in the solution) the molecular volume fraction of component i, given by Equation (3C-3) the weight fraction of component i in the polymer solution the surface area parameter of component i, given by Equation (3C-7) the molecular area fraction of component i, given by Equation (3C-5) a parameter for component i, given by Equation (3C-6) molecular weight of component i (number average recommended), kilograms per kilomole The molecular volume fraction, Cp1, for each component i is given by ep.

The combinatorial part of the activity coefficient [Equation (3C-2)] is known as the Staverman-Guggenheim form. This term is intended to account for size and shape effects. The residual contribution accounts for interactions among groups. , 1980). Predictions for such systems are expected to be less accurate. Finally, the method is only applicable in the temperature range of 300-425 K. Extrapolation outside this range is not recommended. The group parameters are not temperature-dependent. Consequently, predicted phase equilibria extrapolate poorly with respect to temperature.

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