Measurements and correlation of saturated vapor pressures of diethoxy(methyl)(o-tolyl)silane, diethoxy(methyl)(m-tolyl)silane and diethoxy(methyl)(p-tolyl)silane

Vapor pressures, vaporization enthalpies and acentric factors for new compounds, diethoxy(methyl)(o-tolyl)silane, diethoxy(methyl)(m-tolyl)silane and diethoxy(methyl)(p-tolyl)silane were reported. The saturated temperature was measured using the inclined ebulliometer in the pressure range from 2000 to 61,000 Pa and the normal boiling point was measured according to the Siwoloboff method. The standard vaporization enthalpy was derived from the temperature dependence of vapor pressure data. The critical parameters were estimated by an improved group contribution method and the acentric factors have been estimated from the Antoine equation and the experimental normal boiling points.

► The normal boiling point and p–T relationships for pure o-, m- and p-DEMTS were measured.
► Both Antoine and Clarke & Glew equation can fit the experimental data well.
► The standard vaporization enthalpy and the heat capacities at 298.15 K were determined.
► Critical parameters and acentric factors were estimated by group contribution method.