Measurement and Modeling of Sodium Chloride Solubility in Binary Mixtures of Water + Polyethylene Glycol 400 at Various Temperatures Publisher



Soleymani J¹ ; Jouybangharamaleki V² ; Kenndler E³ ; Jouyban A^{4, 5}
Source: Journal of Molecular Liquids Published:2020

Abstract

The solubilities of sodium chloride in the binary solvent system water + PEG 400 were measured by a synthetic method using of a laser-assembled instrument at five temperatures between 298.2 K and 318.2 K. The mole fraction solubility decreased nonlinearly with increasing mass fraction of PEG 400, less pronounced in the water-rich range, steeper with increasing mass fractions of PEG 400 of about 0.6. The highest mole fraction solubility of the salt was 0.1004 measured in neat water at 313.2 K, the lowest solubility was 0.0352 at 293.2 K in pure PEG 400. For the purpose of obtaining solubilities at temperatures and solvent compositions others than the measured ones the following correlation models were applied: The Yalkowsky, the van't Hoff, the combined nearly ideal binary solvent/Redlich-Kister (CNIBS/R-K), the Jouyban-Acree, and the van't Hoff-Jouyban-Acree model. The Overall Mean Percentage Deviation (OMPD) and Mean Percentage Deviation (MPD) were used to evaluate the constructed models for the entire set of the fifty-five data and for the sub-sets of the solubilities, respectively. The lowest OMPD values of 0.6% and 1.2%, respectively, and thus the best prediction abilities, exhibited the van't Hoff and the CNIBS/R-K models. The van't Hoff-Jouyban-Acree model with OMPD of 4.9% allows the calculation of the solubility at any temperature and at any solvent composition by a single model equation. © 2020 Elsevier B.V.