Methanol (1) + water (2) binary

i) VLE type: non-azeotropic mixture

ii) Vapor pressures:

p1s=80.9*exp(para1*tclap**3+para2*tclap**2+para3*tclap) [bar]

para1=0.212768828771579

para2=-0.319352375891615

para3=8.23174708919747

tclap=1-1/(T/512.6)

T: temperature [K]

p2s=221.2*exp(para1*tclap**3+para2*tclap**2+para3*tclap) [bar]

para1=0.222438359031832

para2=-0.0522401918107863

para3=7.17725676105391

tclap=1-1/(T/647.3)

T: temperature [K]

iii) y_1,center =aT**2+bT+c (-10 deg C < T < 121 deg C)

a=1.4239528

b=-0.00137058

c=0.884655

T: temperature [deg C]

The values, T and y_1,center, denote temperature and y1 value at x1=0.5, where x1 is the composition of component 1 in the liquid phase and y1 is the composition of component 1 in the vapor phase.

Fig. 3

y_1,center vs T for the methanol (1) + water (2) binary, (○) y_1,center determined from constant temperature VLE data, (●) y_1,center determined from constant pressure data, and (−) predicted using the PPM.