Vapor-liquid equilibra for cydohexane+2-propoxyethanol and cyclohexane+2-butoxyethanol systems

摘要

2-propoxyethanol (C_3E_1) and 2-butoxyethanol (C_4E_1) are nonionic surfactants which are a particularly interesting class of substances due to both inter-molecular and intra-molecular association, related to the presence of O and OH in the same molecule. Binary (vapor+liquid) equilibrium data were measured for cyclohexane+2-propoxyethanol and cyclohexane+2-butoxy ethanol systems at temperatures ranging from 303.15 K to 323.15 K at 10 K intervals. A static apparatus was used in this study. Two systems show positive deviation from Raoult's law and no azeotrope. The experimental data were correlated well with Peng-Robinson-Stryjek-Vera equation of state using Wong-Sandier mixing rule incorporating the non-random-two-liquid model.