The determination of activity coefficients of alkanes, alkenes, cycloalkanes, and alkynes at infinite dilution with the polar solvents dimethyl sulphoxide (DMSO), orN,N-dimethylformamide (DMF), orN-methyl-2-pyrrolidinone (NMP) using a g.l.c. technique at the temperatures 283.15 K and 298.15 K

Activity coefficients at infinite dilution of {N-methyl-2-pyrrolidinone (NMP), orN,N- dimethylformamide (DMF), or dimethyl sulfoxide (DMSO)+ 1-heptyne, or 1-octyne } using comparative ebulliometry

“…(1)(2)(3) Alkynes would be widely used in chemical synthesis if they were more readily available. (4) The activity coefficient at infinite dilution is an important property in evaluating the separation potential of a solvent.…”

Determination of activity coefficients at infinite dilution of solutes in the polar solvents quinoline, or 1,3-dimethyl-2-imidazolidinone using gas–liquid chromatography at T=(298.15, 313.15 and 323.15) K

“…The results have been used to predict the solvent potential for the separation of liquids by extractive distillation. The results presented here were compared to our previous work on NMP (4) and also to the results on pyrrolidinone (P) reported by Gmehling. (5) Gas-liquid chromatography is a well-established and accurate method for determining γ ∞ 13 .…”

“…(5) Gas-liquid chromatography is a well-established and accurate method for determining γ ∞ 13 . (6,7) Previous work by Letcher and Whitehead (4) involved the determination of γ ∞ 13 for various volatile solutes in a polar solvent such as sulfolane, NMP, dimethyl sulfoxide, and dimethylformamide. In this work γ ∞ 13 has been determined for methanol, benzene, alkanes (C 5 to C 7 ), 1-alkenes (C 6 to C 7 ), 1-alkynes (C 6 to C 7 ) and cycloalkanes (C 5 to C 6 ) in the solvent quinoline, or DMI at T = (298.15, 313.15, and 323.15) K.…”

HmEandVmEof the polar solventsN-methyl-2-pyrrolidinone(C5H9NO), orN,N- dimethylformamide(C3H7NO), or dimethyl sulphoxide(C2H6SO)with 1-hexyne, or 1-heptyne, or 1-octyne atT= 298.15 K, and application of the ERAS theory

“…(4) This was alluded to in a previous publication dealing with the measurement of activity coefficients at infinite dilution. (2) a To whom correspondence should be addressed.…”

“…(1,2) Alkynes would be widely used in chemical synthesis (3) if they were more readily available. The solvents N -methyl-2-pyrrolidinone (C 5 H 9 NO), N ,N -dimethylformamide (C 3 H 7 NO), and dimethyl sulphoxide (C 2 H 6 SO) have the potential for use in separating organic liquids from mixtures containing alkanes, aromatics, and possibly alkenes and alkynes.…”