Measurement of .gamma..infin. using gas-liquid chromatography. 3. Results for the stationary phases 10-nonadecanone, N-formylmorpholine, 1-pentanol, m-xylene, and toluene

Interactions between 33 solutes and four cyano-containing stationary phases: gas chromatographic activity coefficients and the solvation parameter model

“…BC is less polar than SB. summarizes the infinite dilution molar fraction activity coefficients, and their athermal contributions, of the 33 solutes on TCEP, TCEPE, SB, and BC, at 393.15 K. As Langer and Purnell [24] stated, the smaller the activity coefficients the larger the solute-stationary phase interaction, and vice versa, in agreement with the literature [6,7,8,9,10,11,12]. Therefore, especially in the more polar TCEP and TCEPE stationary phases (=30% CN fraction), hydrocarbons, n-octanol, triethylamine, and n-hexyl amine have large activity coefficients, suggesting a weak interaction between these SP and the solutes, while phenol, oxo compounds, amides, and methanol have small activity coefficients, hinting at a strong interaction with TCEP.…”

“…One of the fields of gas-liquid chromatographic application that has had a great development over the last 10 years is the gas-chromatographic determination of activity coefficients [6,7,8,9,10,11,12], from which excess thermodynamic quantities for a given analyte on a given stationary phase can be easily calculated. All these magnitudes constitute a powerful tool for elucidating the solute-stationary phase interactions that occur during retention.…”

Measurement of activity coefficients at infinite dilution in N-methyl-2-pyrrolidone and N-formylmorpholine and their mixtures with water using the dilutor technique

“…3. Comparison of ln(γ ∞ ) data from this work with published data for different alkanes in N-formylmorpholine: (᭜) n-pentane (this work); () n-hexane (this work); (᭡) n-heptane (this work); (᭛) n-pentane [19][20][21]; (ᮀ) n-hexane [19][20][21][22][23][24]; ( ) n-heptane [19][20][21][22][23][24]; (-) linear regression. coefficients in solvent mixtures.…”

Measurements of different thermodynamic properties of systems containing ionic liquids and correlation of these properties using modified UNIFAC (Dortmund)

“…A detailed description of the dilutor and the experimental procedure is given by Krummen et al [8]. The description of the measurement procedure using gas-liquid chromatography was already given by Knoop et al [9].…”