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Experimental and Consistent Thermodynamic Modelling of Excess Molar Volumes for Strong Associated Binary Systems

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: Teodorescu M., Valtz A., Richon D., Wichterle I.

Editorial: Volum Preprints of the "ESAT 2003 - 20th European Symposium on Applied Thermodynamics", Lahnstein - Germany, 8-12 Octomber, p.493-496, 2003.

Rezumat:

The scope of the study was the experimental determination of liquid densities and excess molar volumes (VE) for strong associated binary systems and the consistent thermodynamic modelling of the data obtained. As model systems, water + diethylene glycolamine, and water, methanol, ethanol, 1-propanol + triethylene glycol systems have been selected. The measurements have been carried out at atmospheric pressure and temperatures between 283.15 and 363.15 K. High negative excess volumes were found for most of investigated systems. At given temperature, the most negative VE is for water + diethylene glycolamine system. For water containing systems, VE increase with temperature while the inverse effect was observed for alcoholic systems i.e. VE became more negative with increasing temperature. For triethylene glycol systems at constant temperature, absolute value of VE decreases in the series: water > methanol > ethanol > 1-propanol within the whole composition range. The experimental results have been correlated thermodynamically consistent using the three parameter Redlich-Kister equation.

Cuvinte cheie: water, diethylene glycolamine, methanol, ethanol, 1-propanol, triethylene glycol, mixtures, excess volumes, consistent thermodynamic modeling