UNIQUAC formulation Expression for activity coefficient In y, = In y + ln y In y? = 1n % +3.7, In: +0,- x 2 Combinatorial part + Residual part In y* = 4, 1-1n 0,5 :, ( , , z = coordination number = 10 1 = {(1-9.)-(3-1) = 0, is volume fraction 0,= , riis volume parameter 1 0; is area fraction @= * x/9, 4,9) qi is area paramet [ (1,-1,1) Tj; is interaction parameter TH=exp RT Uji is average interaction Calculate the activity coefficient: 1) Estimate the activity coefficients of ternary mixture at 345 K and 1 bar pressure by UNIQUAC model. The mole fraction, area, volume parameters, interaction parameters are given below. Calculate the azeotropic compositions at the same condition. 1.0 1.216 0.203 1.0 0.048 U = 0.617 0.838 0.612 1.0 parameter Benzene Toluene water X 0.2 0.3 0.5 r 2.5755 3.1878 2.7694 9 2.588 2.634 2.400