A(l - Xi)' In yi = A = In The Calculation of the Parameters for the Wilson

nent 1, all at the temperature T. Substituting eq 7 into eq. 6 and expressing the activity. coefficient by the van Laar equation. A(l - Xi)'. In yi = ...
0 downloads 0 Views 227KB Size
pl = plo

+ RT

In Ylxl

where p l o is the reference chemical potential taken as that of the pure liquid, 71 is the activity coefficient of component 1, all a t the temperature T. Substituting eq 7 into eq 6 and expressing the activity. coefficient by the van Laar equation

A(l - Xi)' [(I - xl) Qxll' where Q = A / B , we have -1 - 2AQ(1 - xi) (9) Qx1I3= x i [(l - xl) This equation presents two roots in the composition range 0 < XI < 1,if the following conditions are obeyed In y i =

+

+

Q21

(10) (11)

With the symbol [ Q ] we indicate the integer part of Q, i.e., the integer number n which verifies the relation n 5 Q