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Showing papers in "Journal of Chemical & Engineering Data in 1996"


Journal ArticleDOI
TL;DR: The octanol−air partition coefficient, KOA, was measured for 15 polychlorinated biphenyls (PCBs) over the temperature range −10 °C to +30 °C using a generator column method as discussed by the authors.
Abstract: The octanol−air partition coefficient, KOA, is measured for 15 polychlorinated biphenyls (PCBs) over the temperature range −10 °C to +30 °C using a generator column method. The enthalpy of phase change from octanol to air, H, is calculated for 18 PCBs and ranges from 66 to 90 kJ/mol. Enthalpy of dissolution of the liquid phase PCB in octanol, ΔSOLH, calculated as ΔVAPH − H, has a mean value of 6.6 kJ/mol (n = 18) and there is no correlation of ΔSOLH with homolog group or number of ortho-substituted chlorine atoms. Results show that KOA values increase within a homolog group for congeners having fewer ortho chlorine atoms. A log10 − log10 correlation of KOA against liquid-phase vapor pressure (poL) shows enhanced partitioning into octanol for mono- and non-ortho congeners. Separate regressions for non/mono-ortho and multi-ortho groups allow KOA to be estimated for other congeners.

245 citations


Journal ArticleDOI
TL;DR: In this article, the results of gas-liquid absorption experiments were evaluated using the Taylor-Aris dispersion method and the viscosities were measured with a falling ball viscometer at temperatures ranging from 293 to 333 K.
Abstract: To evaluate quantitatively the results of gas-liquid absorption experiments, accurate liquid-phase diffusion coefficients and viscosities are needed. In this paper experimental values of these quantities will be reported for the binary systems carbon dioxide + water, carbon dioxide + methanol, ammonia + water, and ammonia + methanol. The diffusion coefficients have been measured using the Taylor-Aris dispersion method, and the viscosities have been measured with a falling ball viscometer at temperatures from 293 to 333 K. The ammonia mole fraction ranged from 0 to 0.312. The results have been correlated using Arrhenius-type equations and have been compared with literature data, where available. Furthermore, the measured diffusion coefficients are compared with values predicted by the modified Stokes-Einstein equation and the Wilke-Chang equation.

224 citations


Journal ArticleDOI
TL;DR: The viscosity and density of water + sodium chloride + potassium chloride solutions were measured at 298.15 K from very dilute to saturated as well as supersaturated solutions as discussed by the authors.
Abstract: The viscosity and density of water + sodium chloride + potassium chloride solutions were measured at 298.15 K from very dilute to saturated as well as supersaturated solutions. A 3.5th term in molarity was added to the extended Jones−Dole equation to produce a new equation. This extended Jones−Dole type equation can well represent the viscosities of the systems studied to saturated concentrations. In low concentrations, the calculated viscosity values by simple additivity are close to the experimental values. Above a certain concentration, the calculated viscosities of NaCl + KCl mixtures are lower than the experimental values and the difference becomes greater with increasing concentration.

218 citations


Journal ArticleDOI
TL;DR: In this article, the interfacial tension of 10 normal alkane + water/brine and hydrocarbon mixture + brine systems were measured by using a pendent drop instrument.
Abstract: Interfacial tensions of 10 normal alkane + water/brine and hydrocarbon mixture + water/brine systems were measured by using a pendent drop instrument The temperature and pressure ranges of measurements are (25 to 80) °C and (1 to 300) bar, respectively The effects of temperature, pressure, and salt content have been studied It was found that the interfacial tension is sensitive to temperature and salt concentration but weakly dependent on pressure and salt species

201 citations


Journal ArticleDOI
TL;DR: In this paper, the solubilities of three inhibitors of inflammatory activity, Ketoprofen, Piroxicam, and Nimesulide, measured using a dynamic saturation technique, are reported at pressures between 100 bar and 220 bar and at two temperatures: 312.5 K and 331.5
Abstract: Supercritical fluid extraction is a potential technique for the purification of pharmaceutical products containing residual solvents. The solubilities of the drugs in supercritical carbon dioxide are being measured as part of a program in which the potential applications of this technology are being investigated. The solubilities of three inhibitors of inflammatory activity, Ketoprofen, Piroxicam, and Nimesulide, in supercritical CO2, measured using a dynamic saturation technique, are reported at pressures between 100 bar and 220 bar and at two temperatures: 312.5 K and 331.5 K. These chemicals have relatively high solubilities with values ranging from 4 × 10-6 to 15 × 10-4 mole fraction. The solubilities exhibit a clear dependence on the solvent density, and this has been used to provide a simple and precise correlation of the data.

152 citations


Journal ArticleDOI
TL;DR: In this paper, the authors used two high-pressure densitometers, phase phase and phase phase, to determine the vapor−liquid equilibria for two binary mixtures at elevated pressures.
Abstract: Vapor−Liquid equilibria for two binary mixtures at elevated pressures were determined by a novel technique of density measurement. In this investigation using two high-pressure densitometers, phase...

151 citations


Journal ArticleDOI
TL;DR: In this article, the Redlich-Kister relation was used to estimate the binary interaction parameters and standard errors for the binary mixtures of cyclohexane with hexane, heptane, octane, nonane, and decane.
Abstract: Experimental values of density, viscosity, and refractive index are presented for the binary mixtures of cyclohexane with hexane, heptane, octane, nonane, and decane at (298.15, 303.15, and 308.15) K over the entire mole fraction range of the mixture components at atmospheric pressure. From these data, excess molar volume, deviations in viscosity, and molar refractivity of the mixtures have been calculated. These quantities are further fitted to the Redlich-Kister relation to estimate the binary interaction parameters and standard errors. The results of excess molar volume and deviations in viscosity are comparable with the available published results at 298.15 K. The sign and magnitude of the calculated excess quantities have been discussed in terms of the nature of the solvent-solvent interactions in binary mixtures.

148 citations


Journal ArticleDOI
TL;DR: In this paper, the solubility of H2 has been measured as a function of pressure in ethanol + water and various solvents at (298 and 323) K. The results are compared with theoretical predictions for H2 in different solivas and some mixtures and found to agree within ±10% error, except for acetonitrile.
Abstract: The solubility of H2 has been measured as a function of pressure in ethanol + water and various solvents at (298 and 323) K. The results are compared with theoretical predictions for H2 in different solvents and some mixtures and found to agree within ±10% error, except for acetonitrile. The solubility of CO in 1-octene has also been measured. Liquid−liquid equilibrium for the 1-octene + water + ethanol system was measured at (298 and 323) K, but the predictions of these data by the UNIFAC−UNIQUAC models were not found to be satisfactory, except for higher 1-octene concentrations in water (>6% w/w) for which the predictions were within 10% error.

135 citations


Journal ArticleDOI
TL;DR: The diffusivity of ozone in water was determined experimentally by measuring the rate of ozone absorption into an aqueous laminar liquid jet as mentioned in this paper, where Penetration theory was used to interpret the results.
Abstract: The diffusivity of ozone in water was determined experimentally by measuring the rate of ozone absorption into an aqueous laminar liquid jet. Penetration theory was used to interpret the results. Experiments were conducted over the temperature range of 10 °C to 45 °C. The results for diffusivity were correlated by an Arrhenius function for temperature dependence with a maximum deviation of ±3.3%: D/m2·s-1 = 1.10 × 10-6 exp[−1896/(T/K)].

134 citations


Journal ArticleDOI
TL;DR: In this article, the liquid phase adsorption equilibria of eight phenolic compounds onto activated carbon fibers were measured in the concentration range 40−500 g·m-3 at 303 K. Several two-and three-parameter isotherm equations were tested.
Abstract: Liquid-phase adsorption equilibria of eight phenolic compounds onto activated carbon fibers were measured in the concentration range 40−500 g·m-3 at 303 K. High adsorption capacities were observed for the chlorinated phenols compared to the methyl-substituted phenols. Several two- and three-parameter isotherm equations were tested. Among the equations tried, the three-parameter equation of Jossens et al. based on a heterogeneous surface adsorption theory was found to be the most satisfactory over the entire range of concentration. The widely used two-parameter equations of Langmuir and Freundlich were not applicable to the present adsorption systems.

129 citations


Journal ArticleDOI
TL;DR: In this paper, the solubilities of four amino acids (l-cystine, l-tyrosine and l-leucine) in aqueous solutions at various pHs and NaCl concentrations (0, 1, 3 mol dm-3) were reported.
Abstract: Solubilities at 25 °C of four amino acids (l-cystine, l-tyrosine, l-leucine, and glycine) in aqueous solutions at various pHs and NaCl concentrations (0, 1, 3 mol dm-3) are reported. The pH was varied from 0 to 13 using HCl or NaOH. The NaCl concentration strongly affects the solubilities of l-cystine, l-tyrosine, and l-leucine. In particular, the addition of NaCl increases the l-cystine solubility but reduces the solubility of l-tyrosine and l-leucine. The NaCl concentration has only a slight effect on the solubility of glycine. Experimental solubilities are correlated with the use of a chemical equilibrium model, good agreement in the pH range 1−12 was found. The analysis confirms the dependence reported in the literature between the solubility of amino acids and the salt concentration. For the amino acids examined, the parameters to calculate their solubilities in solutions with NaCl are also given.

Journal ArticleDOI
TL;DR: In this article, the Freundlich isotherm was used to determine the adaption isotherms for phenol, 3-chlorophenol, and 2,4-dichlorophenol from water onto fly ash.
Abstract: Adsorption isotherms for adsorption of phenol, 3-chlorophenol, and 2,4-dichlorophenol from water onto fly ash were determined. These isotherms were modeled by the Freundlich isotherm. The fly ash adsorbed 67, 20, and 22 mg/g for phenol, chlorophenol, and 2,4-dichlorophenol, respectively, for the highest water phase concentrations used. The affinity of phenolic compounds for fly ash is above the expected amount corresponding to a monolayer coverage considering that the surface area of fly ash is only 1.87 m2/g. The isotherms for contaminants studied were unfavorable, indicating that adsorption becomes progressively easier as more solutes are taken up. Phenol displayed a much higher affinity for fly ash than 3-chlorophenol and 2,4-dichlorophenol.

Journal ArticleDOI
Dong-Joo Seo1, Won-Hi Hong1
TL;DR: In this paper, the gas solubility of CO2 has been measured in aqueous mixtures of diethanaolamine and 2-amino-2-methyl-1-propanol at (40, 60, and 80) °C and in the pressure range (10 to 300) kPa.
Abstract: The gas solubility of CO2 has been measured in aqueous mixtures of diethanaolamine and 2-amino-2-methyl-1-propanol at (40, 60, and 80) °C and in the pressure range (10 to 300) kPa. The concentrations of the amine mixtures were 6 mass % diethanolamine (DEA) + 24 mass % 2-amino-2-methyl-1-propanol (AMP), 12 mass % DEA + 18 mass % AMP, and 18 mass % DEA + 12 mass % AMP. The solubilities show a systematic change as the composition of the aqueous mixtures varies.

Journal ArticleDOI
TL;DR: The solubility of pyrene, chrysene, perylene, and benzo[ghi]perylene were determined at temperatures ranging from 313 K to 523 K and pressures from 100 bar to 450 bar in supercritical CO2 as discussed by the authors.
Abstract: The solubility of pyrene, chrysene, perylene, and benzo[ghi]perylene were determined at temperatures ranging from 313 K to 523 K and pressures from 100 bar to 450 bar in supercritical CO2. Temperature had a much greater effect on solubility than pressure. For example, increasing the temperature from 313 K to 523 K at 400 bar increased the mole fraction solubility of benzo[ghi]perylene from 3.3 × 10-7 to 4.55 × 10-4 compared to an increase from 2.9 × 10-6 to 4.55 × 10-4 when the pressure was increased from 100 bar to 450 bar at 523 K. Correlation of the results shows good self-consistency of the data obtained and reasonable agreement with the available published data. Equations are given for the solubilities over the pressure and temperature conditions studied.

Journal ArticleDOI
TL;DR: In this article, the density and viscosity results for 2,2,4 trimethylpentane at temperatures from 198 K to 348 K and pressures up to 100 MPa are reported.
Abstract: New density and viscosity results for 2,2,4-trimethylpentane at temperatures from 198 K to 348 K and pressures up to 100 MPa are reported. The measurements of both properties were performed simultaneously using a vibrating-wire instrument operated in the forced mode of oscillation. The present set of measurements extends those found in the literature to the high-pressure and low-temperature region. Correlations for both the density and the viscosity are presented, and comparisons are established with various sets of results from the literature. The estimated uncertainties of the results are ±0.05% for the density and ±2.5% for the viscosity.

Journal ArticleDOI
TL;DR: In this article, the liquid−liquid equilibrium for the ternary systems PEG1000 + MgSO4 + H2O, PEG3350 + mgSO 4 + H 2 O and PEG8000 + mgsSO4+ H 2O has been obtained experimentally.
Abstract: The liquid−liquid equilibrium for the ternary systems PEG1000 + MgSO4 + H2O, PEG3350 + MgSO4 + H2O and PEG8000 + MgSO4 + H2O has been obtained experimentally. The results are fitted to a three-parameter equation which fits the results to within ±2%. Tie lines have also been measured, along with the viscosity and density in both phases. The tie-line compositions have been fitted to Bancroft's potential equation.

Journal ArticleDOI
TL;DR: In this paper, the effects of temperature and pH on the solubility of both reference TNT and field neat TNT obtained from the Alabama Army Ammunition Plant (AAAP), Childersburg, AL.
Abstract: Current literature values of 2,4,6-trinitrotoluene (TNT) solubility in water vary widely from 100 to 200 mg/L at room temperature. We investigated the effects of temperature and pH on the solubility of both reference TNT and field neat TNT obtained from the Alabama Army Ammunition Plant (AAAP), Childersburg, AL. The TNT solubility determined from this study was significantly lower than that of Taylor and Rinkenbach, which was cited by several reference chemical handbooks and articles. However, the values reported by the Merck Index and the Lange's Handbook of Chemistry compared well with our values. TNT solubility dropped rapidly as the pH increased. Three unknown HPLC peaks were observed at high pH, indicating a possibility of forming unknown transformation products. Both reference and field neat TNT solubility agreed well. A semiempirical solubility correlation was developed to predict the solubility of TNT at a temperature range from 6 °C to 42 °C.

Journal ArticleDOI
TL;DR: In this article, the excess molar volume (VE) and viscosity deviation (Δη) were calculated for the binary mixtures of C1−C4 with linear and branched alkanols at (298.15, 303.15 and 308.15) K. The VE and Δη values were fitted to a Redlich−Kister polynomial.
Abstract: Densities and viscosities have been measured for the binary mixtures of ethyl acetate with linear and branched alkanols (C1−C4) at (298.15, 303.15, and 308.15) K. The experimental density (ζ) and viscosity (η) values were used to calculate the excess molar volume (VE) and viscosity deviation (Δη). The VE and Δη values have been fitted to a Redlich−Kister polynomial.

Journal ArticleDOI
TL;DR: In this paper, a modified Ben-Naim/Baer apparatus was used for the measurement of the Ostwald coefficients L2,1 of He, Ne, Ar, Kr, N2, O2, CH4, CF4, and SF6 at 298.15 K and atmospheric pressure.
Abstract: The Ostwald coefficients L2,1 of He, Ne, Ar, Kr, N2, O2, CH4, CF4, and SF6 dissolved in several homologous n-alkanes, n-ClH2l+2, 6 ≤ l ≤ 16, have been measured at 298.15 K and atmospheric pressure with a modified Ben-Naim/Baer apparatus. Altogether, 99 gas/liquid systems were investigated. Both pressure control and measurement of the volume of gas dissolved in a given volume of solvent were controlled by a microprocessor. This improved, medium-precision apparatus (the imprecision is approximately ±0.5%) combines easy handling with automated data retrieval and is totally mercury-free. Data reduction is presented in some detail, including the estimation of auxiliary quantities, such as second virial coefficients and partial molar volumes at infinite dilution. The effect of chain length l upon solubility is shown, and some correlations between L2,1, or the derived Henry fugacities H2,1, and appropriate molecular and/or bulk properties of the gases and n-alkanes are discussed.

Journal ArticleDOI
TL;DR: In this paper, the authors presented liquid−liquid equilibrium data for mixtures of tetrahydrothiophene 1,1-dioxide (sulfolane) + 1-heptyne (or +benzene or +p-xylene) + heptane, and for mixture of sulfolane + benzene + decane (or+dodecane) at 303.15 K. Three threeparameter equations have been fitted to the results.
Abstract: Liquid−liquid equilibrium data are presented for mixtures of tetrahydrothiophene 1,1-dioxide (sulfolane) + 1-heptyne (or +benzene or +p-xylene) + heptane and for mixtures of sulfolane + benzene + decane (or +dodecane) at 303.15 K. The addition of benzene to sulfolane is found to increase the solubility of hydrocarbons (heptane > decane > dodecane). The influence of benzene on the solubility of the hydrocarbons is greater than that of p-xylene or of 1-heptyne. The relative mutual solubility of benzene is higher in heptane + sulfolane mixtures then in decane + sulfolane or dodecane + sulfolane mixtures. Three three-parameter equations have been fitted to the results. These equations are compared and discussed in terms of statistical consistency. The NRTL and UNIQUAC models were used to correlate the experimental results and to calculate the phase compositions of the ternary systems. The UNIQUAC equation fitted the experimental data better than the NRTL equation: the average mean square deviations phase com...

Journal ArticleDOI
TL;DR: The results of a study aimed at improvement of the group-contribution methodology for estimation of thermodynamic properties of organic substances are reported in this paper, where experimental studies of enthalpies of combustion in the condensed phase, vapor-pressure measurements, and differential scanning calorimetric (dsc) heat capacity measurements are addressed by experimental studies.
Abstract: The results of a study aimed at improvement of the group-contribution methodology for estimation of thermodynamic properties of organic substances are reported. Specific weaknesses where particular group-contribution terms were unknown, or estimated because of lack of experimental data, are addressed by experimental studies of enthalpies of combustion in the condensed phase, vapor-pressure measurements, and differential scanning calorimetric (dsc) heat-capacity measurements. Ideal-gas enthalpies of formation of cyclohexene, phthalan (2,5-dihydrobenzo-3,4-furan), isoxazole, octylamine, dioctylamine, trioctylamine, phenyl isocyanate, and 1,4,5,6-tetrahydropyrimidine are reported. Two-phase (liquid + vapor) heat capacities were determined for phthalan, isoxazole, the three octylamines, and phenyl isocyanate. Liquid-phase densities along the saturation line were measured for phthalan and isoxazole in the temperature range 298 K to 425 K. The critical temperature and critical density of octylamine were determi...

Journal ArticleDOI
TL;DR: In this paper, Taylor dispersion at 25 °C was used to measure mutual diffusion coefficients for binary aqueous solutions of methanol, ethanol, isomeric propanols and butanols.
Abstract: Mutual diffusion coefficients, measured by Taylor dispersion at 25 °C, are reported for binary aqueous solutions of methanol, ethanol, isomeric propanols and butanols, 1-pentanol, 1-hexanol, and 1-heptanol. Limiting diffusion coefficients (D0) for the 1-alkanols are found to decrease with alcohol molar volume V approximately as V-1/2. Although values of D0 for aqueous 1-propanol and 2-propanol are nearly identical within experimental error, the limiting diffusion coefficients of the isomeric butanols differ by up to 10% and increase in the order D0(2-methyl-2-propanol) < D0(2-butanol) ≈ D0(2-methyl-1-propanol)) < D0(1-butanol). The butanol results illustrate the difficulty of predicting accurate diffusion coefficients for aqueous solutions.

Journal ArticleDOI
TL;DR: In this paper, ultrasonic velocities (u), densities (ρ), viscosities (η), relative permittivities (e), and refractive indicies (nD) of mixtures of acetonitrile with dimethylacetamide, dimethyl sulfoxide, nitrobenzene, and methanol were measured at 25 °C.
Abstract: Ultrasonic velocities (u), densities (ρ), viscosities (η), relative permittivities (e), and refractive indicies (nD) of mixtures of acetonitrile with dimethylacetamide, dimethyl sulfoxide, nitrobenzene, and methanol have been measured at 25 °C. From u, ρ, and η, isentropic compressibilities (κs), and its deviation from ideal behavior and excess viscosities (Δη) have been computed. From nD and e, the Kirkwood correlation factor, g, has also been evaluated.

Journal ArticleDOI
W.V. Steele1, R.D. Chirico1, S.E. Knipmeyer1, A. Nguyen1, N.K. Smith1 
TL;DR: In this paper, ideal gas enthalpies of formation of butyl vinyl ether, 1,2-dimethoxyethane, methyl glycolate, bicyclo[2.2.1]hept-2-ene, trans-azobenzene, butyl acrylate, di-tert-butyl ether, and hexane-1,6-diol are reported.
Abstract: Ideal-gas enthalpies of formation of butyl vinyl ether, 1,2-dimethoxyethane, methyl glycolate, bicyclo[2.2.1]hept-2-ene, 5-vinylbicyclo[2.2.1]hept-2-ene, trans-azobenzene, butyl acrylate, di-tert-butyl ether, and hexane-1,6-diol are reported. Enthalpies of fusion were determined for bicyclo[2.2.1]hept-2-ene and trans-azobenzene. Two-phase (solid + vapor) or (liquid + vapor) heat capacities were determined from 300 K to the critical region or earlier decomposition temperature for each compound studied. Liquid-phase densities along the saturation line were measured for bicyclo[2.2.1]hept-2-ene. For butyl vinyl ether and 1,2-dimethoxyethane, critical temperatures and critical densities were determined from the dsc results and corresponding critical pressures derived from the fitting procedures. Fitting procedures were used to derive critical temperatures, critical pressures, and critical densities for bicyclo[2.2.1]hept-2-ene, 5-vinylbicyclo[2.2.1]hept-2-ene, trans-azobenzene, butyl acrylate, and di-tert-but...

Journal ArticleDOI
TL;DR: The surface tension of aqueous solutions of diethanolamine and triethanolamine was measured over the entire concentration range at temperatures of 25 °C to 50 °C as mentioned in this paper.
Abstract: The surface tension of aqueous solutions of diethanolamine and triethanolamine was measured over the entire concentration range at temperatures of 25 °C to 50 °C. The experimental values were correlated with temperature and with mole fraction. The maximum deviation was in both cases always less than 0.5%.

Journal ArticleDOI
Abstract: This paper reports measurements made within the DIPPR‡ Project 821 for the 1992 Project Year. Vapor pressures were measured to a pressure limit of 270 kPa or lower decomposition point for eight compounds using an inclined-piston and twin ebulliometric apparatus. Liquid-phase densities along the saturation line were measured for each compound over a range of temperature (ambient to a maximum of 548 K). A differential scanning calorimeter (dsc) was used to measure two-phase (liquid + vapor) heat capacities for each compound in the temperature region ambient to the critical temperature or lower decomposition point. Where possible, the critical temperature and critical density for each compound were determined experimentally. The results of the measurements were combined to derive a series of thermophysical properties including critical temperature, critical density, critical pressure, acentric factor, enthalpies of vaporization [restricted to within ±50 K of the temperature region of the experimentally deter...

Journal ArticleDOI
TL;DR: In this article, the chemical equilibrium constant for the dissociation of N-methyldiethanolamine (MDEA, CH3N(C2H5OH)2) in aqueous solutions is determined from electromotive force measurements at temperatures from 278 K to 368 K.
Abstract: The chemical equilibrium constant for the dissociation of protonated N-methyldiethanolamine (MDEA, CH3N(C2H5OH)2) in aqueous solutions is determined from electromotive force measurements at temperatures from 278 K to 368 K. Experimental results are reported and compared to literature values. Experimental results (on molality scale) are correlated by ln K = [−819.7/(T/K)] − 79.474 + 10.9756 ln(T/K).

Journal ArticleDOI
TL;DR: In this article, the solubilities of He, N2, O2, CH4, and CO2 in aqueous solutions of glycerol, acetic acid, glucose, sucrose, and lactose were measured at 303.2 and 323.2 K. The present results and literature data were analyzed to develop an empirical model.
Abstract: The solubilities of He, N2, O2, CH4, and CO2 in aqueous solutions of glycerol, acetic acid, glucose, sucrose, and lactose were measured at 303.2 K. Additional data were generated for CO2 at 293.2 K and 323.2 K. The present results and literature data were analyzed to develop an empirical model. The parameter set allows predictions for 15 gases and 63 organic substances at temperatures between 273 K and 343 K.

Journal ArticleDOI
TL;DR: In this article, the authors present all known experimental data for the critical constants of unsaturated aliphatic hydrocarbons, which have been divided into five families: linear alk-1-enes (10 compounds, C2 to C12); other alkenes (8 compounds, 4 to C6); alkadienes (3 compounds, 3 to C 6); terpenes ( 3 C10 compounds); and alkynes (3 compound, C 2 to C4).
Abstract: This is part 6 of a series of contributions by the critical properties group of the IUPAC Commission I.2 on Thermodynamics, Subcommittee on Thermodynamic Data. It presents all known experimental data for the critical constants of unsaturated aliphatic hydrocarbons, which have been divided into five families: linear alk-1-enes (10 compounds, C2 to C12); other alkenes (8 compounds, C4 to C6); alkadienes (3 compounds, C3 to C6); terpenes (3 C10 compounds); and alkynes (3 compounds, C2 to C4). Recommendations are given together with uncertainties. Critical temperatures have been converted to ITS-90.

Journal ArticleDOI
TL;DR: In this paper, three-phase (ice + hydrate + vapor and liquid water + hydrates + liquid hydrocarbons + vapor) and four-phase equilibrium data were reported for the structure H (sH) hydrates of xenon + 2,2-dimethylbutane and methane + 2 2,2,dimethylamine.
Abstract: Three-phase (ice + hydrate + vapor and liquid water + hydrate + vapor) equilibrium data are presented for xenon structure I (sI) hydrate in the temperature range 228−288 K. Four-phase (ice + hydrate + liquid hydrocarbon + vapor and liquid water + hydrate + liquid hydrocarbon + vapor) equilibrium data are reported for structure H (sH) hydrates of xenon + 2,2-dimethylbutane and methane + 2,2-dimethylbutane. The data for both of the latter systems indicated two invariant five-phase points (I + liquid water + sH + V + liquid hydrocarbon) at 273.15 K while the data for the water + xenon + 2,2-dimethylbutane system indicated an additional quintuple point (liquid water + sI + sH + vapor + liquid hydrocarbon) at 283.2 K.