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Ebulliometric and Static Measurement of Total Pressure in the in the Binary Water + Poly(Ethylene Glycol) System

The total pressure of the systems containing water and three different poly(ethylene glycol)s with nominal molecular weights of 1000, 3000 and 6000 g mol-1 was measured isothermally at 303.15, 308.15, 313.15, 323.15, 333.15, 343.15, 353.15 and 363.15, using the improved apparatus as described in Ref. [1] and ebulliometrically [2], covering the concentration range up to 50 wt % of the polymer. The 343.15 K isotherm was measured by both experimental methods, and both showed good continuity and performance. The vapour pressure data are expressed in terms of water activity, a1 = P1/P1o, where P1 is partial pressure and P1o is vapor pressure of pure water. The static and ebulliometric data agree well qualitatively, but quantitatively the static activities are higher about 2.5% in average, what is acceptable regarding the accuracy of measurements. The data were successfully correlated with the UNIQUAC-FV model [1]. References [1] J. Pavlíček, G. Bogdanić, I. Wichterle, Fluid Phase Equilib. 2017, 454, 111–115. [2] J. Pavlíček, G. Bogdanić, I. Wichterle, Chem. Biochem. Eng. Q. 2014, 28, 447–450. Acknowledgment This study was partly supported by the Czech Science Foundation (Grant No. 15-19542S).

total pressure measurement ; polymer+solvent system ; vapor-liquid equilibria

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