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Isobaric(T–x–y) binary vapor–liquid equilibrium (VLE) data weremeasured and modeled for the n-dodecane + {propan-1-ol,butan-1-ol, or 2-methylpropan-1-ol} systems at 40 kPa. A low pressuredynamic still, capable of measuring systems of high relative volatility,was used for the measurements. The vapor and liquid equilibrium compositionswere determined using a gas chromatograph with a thermal conductivitydetector. The experimental data were regressed using the combinedmethod (γ–φ approach). The nonrandom two-liquid(NRTL) activity coefficient model was used to describe the liquidphase nonideality, and the vapor phase was assumed to be ideal. TheNRTL model parameters were determined using nonlinear least-squaresregression. The experimental data were found to be well correlatedwith the thermodynamic modeling. No azeotropic behavior has been observed.The three investigated systems show a large positive deviation fromRaoult’s law. [ABSTRACT FROM AUTHOR]

Isobaric binary vapor–liquid equilibrium (VLE)data weremeasured for the 1-methyl-4-(1-methylethenyl)-cyclohexene (d-limonene) {ethanol, propan-1-ol, propan-2-ol, butan-1-ol, pentan-1-ol,or hexan-1-ol} systems at 40 kPa. A low pressure dynamic still wasused for the measurements. The experimental data were regressed usingthe nonrandom two-liquid (NRTL) and Wilson activity coefficient models.Both models correlated the data well. The 1-methyl-4-(1-methylethenyl)-cyclohexene {butan-1-ol or pentan-1-ol or hexan-1-ol} systems exhibit a minimumtemperature azeotrope. The 1-methyl-4-(1-methylethenyl)-cyclohexene {ethanol or propan-1-ol or propan-2-ol} systems show the largestpositive deviation from Raoult's law, and these systems exhibit noazeotropic behavior. [ABSTRACT FROM AUTHOR]

Abstract: Solid–liquid equilibria (SLE) measurements have been undertaken for carboxylic acid systems comprising (butyric acid+propionic or pentanoic acid) and (heptanoic acid+propionic or butyric or pentanoic or hexanoic acid) via a synthetic method using two complementary pieces of equipment. The measurements have been obtained at atmospheric pressure and over the temperature range of (225.6 to 270.7)K. All the acid mixtures exhibit a eutectic point in their respective phase diagrams, which have been determined experimentally. The estimated maximum uncertainties in the reported temperatures and compositions are ±1K and ±0.0006 mole fraction, respectively. The experimental data have been satisfactorily correlated with the Wilson and NRTL activity coefficient models. [Copyright &y& Elsevier]