Vapor-liquid and liquid-liquid equilibria in the water + poly(propyleneglycol) system.

0542742 - ÚCHP 2022 RIV NL eng J - Journal Article
Pavlíček, Jan - Rotrekl, Jan - Bogdanić, Grozdana - Wichterle, Ivan - Izák, Pavel
Vapor-liquid and liquid-liquid equilibria in the water + poly(propyleneglycol) system.
Journal of Molecular Liquids. Roč. 337, SEP 1 (2021), č. článku 116336. ISSN 0167-7322. E-ISSN 1873-3166
R&D Projects: GA ČR(CZ) GA18-05484S
Institutional support: RVO:67985858
Keywords : vapor–liquid equilibrium * liquid–liquid equilibrium * polymer–solvent system
OECD category: Physical chemistry
Impact factor: 6.633, year: 2021
Method of publishing: Open access with time embargo

The aim of this study was to investigate phase equilibria in a water +poly(propylene glycol) [Mn = 425g mol-1] system. Vapor-liquid equilibria (VLE) were determined ebulliometrically in the completely miscible region with higher water concentrations at isotherms 323.15, 333.15, 343.15, and 353.15 K. These data were correlated with the UNIQUAC free-volume (FV) model to be consistent with our previous studies. Liquid-liquid equilibrium (LLE) was determined using the cloud-point method at 320–350 K, and lower critical solution temperature was found at 320.2 K. LLE was correlated with the entropic FVUNIQUAC segmental interaction model developed earlier, which is suited for correlation and calculation of LLE of polymer solutions. We estimated new binary segmental interaction parameters for interactions between propylene glycol and water segments.
Permanent Link: http://hdl.handle.net/11104/0321385