Using the data for the azeotropic mixture, calculate the values of A12 and A21 for the 2-parameter Margules equation.
A pair of compounds identified as 1 and 2 have the following properties:
This pair of compounds forms an azeotrope at 350 K and P = 8.5 bar, with x1 = y1 = 0.31.
Calculate the activity coefficients from experimental data:
Apply the 2-parameter Margules equations to solve for A12 and A21. Eq. 1:
Solve system of equations:
Eq. 1:
0.5306=0.1809A_12+0.295A_21
Eq. 2:
[0.0607=-1.284A_21+1.38A_12 ]*0.295/1.284
0.01399=-0.295A_21+0.318A_12
Summation of both equations:
0.5446=0.4989A_12
A_12=1.092
0.5306=0.1809(1.092)+0.295A_21
A_21=1.12
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