Excess Properties of Binary Alkanol + Diisopropyl Ether (DIPE) or + Dibutyl Ether (DBE) Mixtures and the Application of the Extended Real Associated Solution Model

Abstract

Experimental results are reported at 298.15 K for excess molar volumes V E and excess molar enthalpies H E for binary mixtures of methanol, ethanol, 2-propanol, 1-butanol, and 2-butanol with diisopropyl ether (DIPE) and/or with dibutyl ether (DBE). A vibrating-tube densitometer was used to determine V E, and H E was measured using a quasi-isothermal flow calorimeter. The applicability of the extended real associated solution model has been investigated for describing the experimental excess properties presented as well as literature data of alkanol−ether mixtures containing DIPE and DBE.

Excess molar volumes and enthalpies of { an alkanol +tert -amyl methyl ether ( TAME )}

“…The same behaviour of these parameters with respect to the molecular structure has been found for mixtures of linear and branched alkanols with another branched ether (diisopropyl ether). (11,12) Results reported by Letcher and Govender (10) also reveal this behaviour for h * AB and ν * AB although they used in their model calculations different pure component parameters and different X AB values for …”

“…For this ether the values of the excess properties significantly increase on going from linear alkanols to the branched ones (figures 2 and 3), a behavior similar to that of DIPE (di-isopropyl ether) with alkanols. (11,12) This is due to the fact that the formation of (alkanol · ether) cross-associates is more pronounced in mixtures with linear alkanols. …”

Volumetric properties of (an organic compound + di-n-butyl ether) atT= 298.15 K

“…For the latter binary system, a different behaviour is exhibited by V E m data reported by Rezanova et al (14) (2) for (di-n-butyl ether + an organic compound) at hydrocarbons and other polar organic compounds with DBE. The literature data were obtained from the Redlich-Kister equation parameters reported by the authors or, in the absence, by graphical extrapolation of the function V E m /{x(1 − x)} calculated by us from the reported V E m or density data.…”

Excess properties of binary mixtures of an alkanol or an alkane with butyl-vinyl ether oriso-butyl-vinyl ether

“…Similar behavior has been observed for mixtures of DBE (dibutyl ether) with linear and branched alkanols. (14,15) Experimental excess molar volumes V E m and excess molar enthalpies H E m at T = 298.15 K of the (ether + alkane) systems are listed in tables 3 and 4, and their dependence on mole fraction is shown in figures 3 to 5 together with the results of the model calculations. A survey of the literature shows that neither H E m nor V E m have been reported for these mixtures.…”

“…(4,14,15) The ERAS model combines association effects due to hydrogen bonding (chemical contribution) and free volume effects arising from differences of the van der Waals interactions (physical contribution) between like and unlike molecules in the mixture. strong hydrogen bonding, the chemical contribution dominates the excess properties.…”