Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6659718 | The Journal of Chemical Thermodynamics | 2018 | 106 Pages |
Abstract
Densities (Ï), speeds of sound (u) and viscosities (η) for binary mixtures of {waterâ¯+â¯ethanol, orâ¯+â¯ethylene glycol (EG), orâ¯+â¯diethylene glycol (DEG), orâ¯+â¯triethylene glycol (TEG), orâ¯+â¯polyethylene glycol (PEG) 200, orâ¯+â¯polyethylene glycol (PEG) 300, orâ¯+â¯polyethylene glycol (PEG) 400, orâ¯+â¯polyethylene glycol (PEG) 600, orâ¯+â¯glycerol} have been determined as a function of composition at Tâ¯=â¯(293.15, 298.15, 303.15 and 308.15â¯K) and atmospheric pressure. From these results, excess molar volume (VmE), deviation in isentropic compressibility (ÎκS), deviation in viscosity (Îη), and excess Gibbs energy of activation for viscous flow (ÎGâE) were calculated and fitted by the Myers-Scott equation, as a function of mole fraction. Values of VmE and ÎκS were negative over the entire composition range for all mixtures studied. The values of Îη were negative for the systems containing ethylene glycol and glycerol and positive for the systems containing ethanol, PEG 400 and PEG 600. For other systems, the deviation of viscosity presented an S-shape, with negative values at high water concentration. For all mixtures studied, the values of ÎGâE were positive over the entire composition range. The results obtained were discussed in terms of structural effects and intermolecular interactions between like and unlike molecules.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Heloisa Emi Hoga, Ricardo Belchior Torres, Pedro Luiz Onófrio Volpe,