Methylal is a byproduct in industrial processes, for example, in the production of polyacetal plastics. In such processes aqueous solutions of methylal and methanol have to be treated by distillation. This contribution reports experimental results for the phase equilibrium in such mixtures: vapor-liquid equilibrium of the binary systems (water + methylal) at 284 e T/K e 388 and (methanol + methylal) at 303 e T/K e 348, and of the ternary system (water + methanol + methylal) at 303 e T/K e 363, as well as liquid-liquid equilibrium of (water + methylal) and (water + methanol + methylal) at 273 e T/K e 313. Furthermore, new experimental results are reported for the vapor pressure of methylal at 318 e T/K e 357. The new experimental phase equilibrium data are correlated using the UNIQUAC model to describe the Gibbs excess energy of the liquid mixtures.
Thermodynamic properties of poly(vinylpyrrolidone) (PVP) were studied by laser-light-scattering,
membrane osmometry, and isopiestic measurements. Four polymer samples of weight-average molecular
mass between about 9000 and 1 200 000 were investigated at temperatures from (278 to 333) K. The
experimental results are described with application of the osmotic virial equation and compared to
literature data.
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