Bulk Properties of the Monoethanolamine–1,4-Dioxane System

The density of solutions of 1,4-dioxane (DO) in monoethanolamine (MEA) in 0–0.2 ppm DO concentrations and the temperature range of 25–75°C is measured to examine solvophobic effects in solvents with spatial networks of hydrogen bonds. Apparent and excess molar volumes of DO in a MEA–DO mixture are calculated. The obtained concentration and temperature dependences of the bulk properties of DO show there were no solvophobic effects in the studied liquid system, which is explained by the insufficient lability of the H-bond network in MEA in the investigated range of temperatures. The results are compared to similar literature data on the H2O–DO and ethylene glycol (EG)–DO systems. The hydrophobic effect was detected earlier in the H2O–DO system; based on the bulk properties, the solvophobic effect was not observed in the EG–DO system in the temperature range of 25–75°C.