Measurement and Modeling of Isobaric Vapor-Liquid Equilibrium of Water plus Glycols

authors	Chouireb, N; Crespo, EA; Pereira, LMC; Tafat-Igoudjilene, O; Vega, LF; Coutinho, JAP; Carvalho, PJ
nationality	International
journal	JOURNAL OF CHEMICAL AND ENGINEERING DATA
keywords	DIRECTIONAL ATTRACTIVE FORCES; EQUATION-OF-STATE; SOFT-SAFT EQUATION; PHASE-EQUILIBRIA; ASSOCIATING FLUIDS; AQUEOUS-SOLUTIONS; ETHYLENE-GLYCOL; CHAIN MOLECULES; IONIC LIQUIDS; N-ALKANES
abstract	We present new experimental data on the isobaric vapor liquid equilibria (VLE) of four binary mixtures of water with ethylene glycol, diethylene glycol, triethylene glycol, or tetraethylene glycol, measured at three different system pressures (0.05, 0.07, and 0.1 MPa). Water activity coefficients were estimated from the mixtures boiling temperatures and used to rationalize the effect of the increasing glycols chain length on the molecular interactions with water. The soft statistical associating fluid theory (SAFT) equation of state was used to describe the experimental VLE data of these highly nonideal systems, providing insights into the molecular interactions leading the macroscopic behavior of the mixtures. Glycols and water were both modeled as associating molecules, with models and parameters from previous works, in a transferable manner. Soft-SAFT accurately reproduces the experimental data using one single, state independent, binary interaction parameter to correct the mixtures dispersive energy. It is further shown that the parametrization obtained from the pure glycols can be used to accurate predictions of the water activities in aqueous solutions of PEGs of higher molecular weight (600-6000 g/mol) highlighting the soft-SAFT robustness and the soundness of the parametrization used.
publisher	AMER CHEMICAL SOC
issn	0021-9568
year published	2018
volume	63
issue	7
beginning page	2394
ending page	2401
digital object identifier (doi)	10.1021/acs.jced.7b00945
web of science category	Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical
subject category	Thermodynamics; Chemistry; Engineering
unique article identifier	WOS:000439007300007