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Excess properties of binary liquid mixtures of glycols + water at different temperatures and atmospheric pressure

Author(s):
Heloisa Emi Hoga
Total Authors: 1
Document type: Doctoral Thesis
Institution: Universidade Estadual de Campinas. Instituto de Química
Defense date:
Examining board members:
José de Alencar Simoni; Rogério Custódio; Marcelo Martins Seckler; Marcos Rogério Mafra
Advisor: Pedro Luiz Onófrio Volpe
Abstract

Excess properties have been a qualitative and quantitative way to predict ideality deviation of liquid binary mixtures. Moreover the excess properties have been used to development molecular theories and new solution models. In this study, density, speed of sound, viscosity and enthalpy of binary mixtures of water + ethanol, or + ethylene glycol, or + diethylene glycol, or + triethylene glycol, or + polyethylene glycol 200, or + polyethylene glycol 300, or + polyethylene glycol 400, or + polyethylene glycol 600, or + glycerol have been determined as a function of composition at several temperatures and atmospheric pressure. The density and speed of sound data were determined using a density and sound velocity meter (Anton Paar, Model DSA 5000) The viscosity data was determined using a viscometer (Anton Paar, Model SVM 3000). The enthalpy date was determined using a microcalorimeter (Thermal Activity Monitor, Titration mode, LKB2277, Thermometric). The temperatures studied were 293.15, 298.15, 303.15 and 308.15 K. Only enthalpy data was measured at 298.15 K. The experimental results have been used to calculated the excess molar, deviations in isentropic compressibility, deviations in viscosity, excess Gibbs free energy of activation of viscous flow and excess molar enthalpy. The excess properties were correlated by using a Redlich-Kister and Myers-Scott polynomial equation. The results were discussed on the basis of intermolecular interactions between the components of the analyzed mixtures. (AU)

FAPESP's process: 10/17422-7 - Study of local properties of liquid binary solutions of water + Poly(ethylene) Glycol (PEGs) using data of excess properties and the fluctuation theory of Kirkwood-Buff
Grantee:Heloisa Emi Hoga
Support type: Scholarships in Brazil - Doctorate