Composite data type experimental value

Calculation of the extreme values of the activities at the spinodal compositions xgp for variable values of W/2.303 RT yields the data presented in Figure 11. It appears that values as high as log aFA = 2 are reached in the range xgp > 0.83. Accordingly, the value of log agpA is about -0.5, which is close to the experimental value at x = 0.868. Thus, the assumption of a mixed-type regular and subregular solid solution with W- = W2 =... 

The extension of ideal phase analysis of the Maxwell-Stefan equations to nonideal liquid mixtures requires the sufficiently accurate estimation of composition-dependent mutual diffusion coefficients and the matrix of thermodynamic factors. However, experimental data on mutual diffusion coefficients are rare, and prediction methods are satisfactory only for certain types of liquid mixtures. The thermodynamic factor may be calculated from activity coefficient models such as NRTL or UNIQUAC, which have adjustable parameters estimated from experimental phase equilibrium data. The group contribution method of UNIFAC may also be helpful, as it has a readily available parameter table consisting of mam7 species. If, however, reliable data are not available, then the averaged values of the generalized Maxwell-Stefan diffusion coefficients and the matrix of thermodynamic factors are calculated at some mean composition between x0i and xzi. Hence, the matrix of zero flux mass transfer coefficients [k ] is estimated by... 

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