Determination of temperature dependence of limiting activity coefficients for a group of moderately hydrophobic organic solutes in water

Measurement of infinite dilution activity coefficients of 1-alkanols (C1–C5) in water as a function of temperature (273–373 K)

“…As seen from Table 2, the uncertainty of the determined γ ∞ 1 values does not exceed 5%, in most cases being 2-3%. Note that in Table 2 listed are for comparison and completeness also several other results we have reported originally elsewhere, namely those from our previous RDIST measurements for 1-butanol [6] and from our recent measurements at 328.15 K by the refined non-steady-state gas-liquid chromatography (NSGLC) [16]. The NSGLC method is an additional (sixth) experimental technique we used to examine the systems under study.…”

“…b Other report from this laboratory: [16]. c Other report from this laboratory: [6]. In both procedures, we employed the following equation to describe the temperature dependence of γ ∞…”

“…Since we have used these methods previously and described the respective instrumentation and experimental procedures in detail, given here is only a brief overview of their principles supplemented with particularities, if any, that are specific to the present application. For a full account of our experimental techniques we refer the reader to our previous papers [6][7][8][9][10].…”

“…In our apparatus [6] the vapor phase is circulated by an inert pump through the liquid phase in the equilibrium cell and the gas sampling loop of GC, which avoids perturbation of the equilibrium during sampling and suppresses sorption effects. For the present systems, the HSA measurements were carried out typically in the range of alkanol mole fractions from 0.0004 to 0.002 and at lower temperatures (273-293 K).…”

“…In a follow-up paper we then present a comprehensive compilation and critical evaluation of all experimental literature data on γ ∞ 1 , limiting partial molar excess enthalpyH E,∞ 1 and heat capacityC E,∞ P,1 and their simultaneous processing together with data measured in our laboratory, which results in recommended values of these infinite dilution excess properties of a significantly improved accuracy. For 1-butanol, for which we have established such a recommendation previously within a framework of a broader pilot study on γ ∞ 1 (T ) for a group of moderately hydrophobic organic solutes in water [6], we present its update involving besides new data from the literature also newly measured data from this laboratory.…”