Showing papers in "Journal of Chemical & Engineering Data in 2001"
TL;DR: The NIST Chemistry WebBook (http://webbook.nist.gov) as discussed by the authors provides access to chemical and physical property data both from NIST and other sources, including a wide variety of thermochemical, ion energetics, solubility, and spectroscopic data.
Abstract: The NIST Chemistry WebBook (http://webbook.nist.gov) is an Internet site that provides access to chemical and physical property data both from NIST and other sources. The site was established in 1996 and has grown to encompass a wide variety of thermochemical, ion energetics, solubility, and spectroscopic data. The thermochemical data available include enthalpies of formation, enthalpies of phase transitions, and heat capacities. Thermochemical properties of many reactions that support enthalpy of formation values are provided. Automated tools are used to check data prior to its inclusion in the web site. Most of the collections in the site provide extensive coverage of the literature in their field and include relevant metadata such as the experiment type or important auxiliary data. These features make the site an excellent tool for data evaluation. A major goal of the project was to provide convenient access to all types of chemical data. Several challenges were encountered in the development of system...
466 citations
TL;DR: In this article, the emergent drop image was captured and sent to the video recording system, where the authors measured interfacial tension using a numerical method based on a fourth degree spline interpolation of the drop profile.
Abstract: Interfacial tension was measured for hexane + water, heptane + water, octane + water, nonane + water, decane + water, undecane + water, and dodecane + water, using the emergent drop experimental technique with a numerical method based on a fourth degree spline interpolation of the drop profile. The experimental equipment used to generate the drop consists of a cell with a stainless steel body and two Pyrex windows. The inner cell was previously filled with water. A surgical needle (at the bottom of the cell) was used to introduce the organic phase into the cell (forming the emergent drop). Water was used to keep the temperature constant inside the cell (between 10 °C and 60 °C). The cell was illuminated from the back using a fiber optic lamp and a diffuser. A video camera (with a 60 mm microlens and an extension ring) was located at the front window. The emergent drop image was captured and sent to the video recording system. The cell and the optical components were placed on an optical table with vibrati...
425 citations
TL;DR: In this article, the activity coefficients at infinite dilution of 19 alkanes, alkenes, and alkylbenzenes in the ionic liquid 4-methyl-n-butylpyridinium tetrafluoroborate (C10H16BF4N) were determined by gas chromatography.
Abstract: Activity coefficients at infinite dilution γi∞ of 19 alkanes, alkenes, and alkylbenzenes in the ionic liquid 4-methyl-n-butylpyridinium tetrafluoroborate (C10H16BF4N) were determined by gas chromatography using the ionic liquid as stationary phase. The measurements were carried out at different temperatures between 313.1 K and 363.1 K. From the temperature dependence of the limiting activity coefficients partial molar excess enthalpies at infinite dilution of the organic solutes in the ionic liquids have been derived.
236 citations
TL;DR: In this paper, the Redlich−Kister equation has been used to estimate the binary fitting parameters, and root-mean-square deviations from the regression lines are shown for the above systems.
Abstract: Density, ρ; refractive index on mixing, nD; and speed of sound, u; at 293.15 K, 298.15 K, 303.15 K, and 313.15 K and atmospheric pressure have been measured for binary mixtures of diethyl carbonate (DEC) + methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, or 1-pentanol. Excess molar volumes, VE; changes of refractive index on mixing, ΔnD; and deviations in isentropic compressibility, ΔκS; for the above systems have been calculated. The Redlich−Kister equation has been used to estimate the binary fitting parameters, and root-mean-square deviations from the regression lines are shown. The VE values were fitted as a function of the mole fraction and temperature to a polynomial equation.
156 citations
TL;DR: In this paper, the partial pressure of carbon dioxide above a 50 mass % aqueous solution of methyldiethanolamine was measured as a function of the amount of CO 2 absorbed in the solution.
Abstract: The partial pressure of carbon dioxide above a 50 mass % aqueous solution of methyldiethanolamine was measured as a function of the amount of carbon dioxide absorbed in the solution. Data were obtained over the temperature range 25 °C to 100 °C and for carbon dioxide loadings up to 0.5 mol CO2/mol amine. Data were also obtained for the solubility of nitrous oxide in these solutions over the temperature range 25 °C to 80 °C. It is found that the solubility of nitrous oxide decreases significantly as the carbon dioxide loading increases. The data obtained in this study may be used with the nitrous oxide analogy method to estimate the physical solubility of carbon dioxide in 50 mass % methyldiethanolamine solutions as a function of carbon dioxide loading and temperature.
138 citations
TL;DR: In this paper, new molecular descriptors were selected consistent with the accuracy of the training set extracted from the DIPPR database, and their additive increments to the parachor were regressed from 8697 surface tension values of uncertainty less than 5% for 649 different compounds.
Abstract: Combination of commercial QSPR (quantitative structure-property relationship) software with an evaluated database creates a powerful tool for development of thermophysical property correlations. By using data quality codes in the DIPPR relational database, a training set of property values within a desired accuracy level can be obtained for use in QSPR regression software. Moreover, additional database queries can be used to restrict the training set to specified families or functional groups and further refine the molecular descriptors that are used to correlate the property. This provides a good basis for rapid development of QSPR correlations of known uncertainty and chemical domain. This procedure is illustrated by its application to the extension of the Macleod-Sugden (Trans. Faraday Soc. 1923, 19, 38. Chem. Soc. 1924, 125, 32.) correlation for surface tension based upon the parachor. Quayle (Chem. Rev. 1953, 53, 439-591.) correlated the parachor in terms of additive atomic and structural increments but used a training set limited in temperature and scope. In this work, new molecular descriptors were selected consistent with the accuracy of the training set extracted from the DIPPR database, and their additive increments to the parachor were regressed from 8697 surface tension values of uncertainty less than 5% for 649 different compounds. This produced a correlation with an average absolute deviation (AAD) of 3.2%. This can be compared with an AAD of 6.9% using the Quayle descriptors for the same set.
132 citations
TL;DR: In this paper, the adsorption equilibria of ammonia gas on various inorganic and organic sorbents were determined at 29815 K in a pressure range of 0−101 kPa using a static volumetric apparatus.
Abstract: The adsorption equilibria of ammonia gas on various inorganic and organic sorbents were determined at 29815 K in a pressure range of 0−101 kPa using a static volumetric apparatus The zeolite sorbents were 4A, 5A, 13X, dealuminated faujasite, dealuminated pentasil, and clinoptilolite To illustrate the differences between commercial grades, the 5A and 13X zeolites were obtained from three suppliers Other inorganic sorbents were three aluminas and three silica gels Organic sorbents were two activated carbons, charcoal, and two polymeric sorbents (sulfonated and nonsulfonated) The nonlinear experimental equilibrium data were fitted to the Langmuir, Freundlich, Langmuir−Freundlich, and Toth isotherm models The Henry model was used for the linear equilibrium data The equilibria of all of the sorbents, with the exception of sulfonated polymeric and dealuminated pentasil zeolite sorbents, provide an accurate correlation with the isotherm models over the entire pressure range
123 citations
TL;DR: In this paper, the effects of gas composition, temperature, and pressure on interfacial tension of the systems studied have been investigated and the linear gradient theory was used to calculate the interfacial tensions of these two systems.
Abstract: Interfacial tension data of (CH4 + N2) + H2O and (CO2 + N2) + H2O systems were measured using a pendant-drop method. The temperature and pressure ranges were 298−373 K and 1−30 MPa, respectively. The effects of gas composition, temperature, and pressure on the interfacial tension of the systems studied have been investigated. The linear gradient theory (LGT) was used to calculate the interfacial tensions of these two systems. The results show good agreement between the calculated and experimental interfacial tension data for the (CH4 + N2) + H2O system. However, it was found that the LGT model with one adjustable parameter is inadequate to give accurate predictions for the CO2 + H2O system and thus is not suitable for the description of the (CO2 + N2) + H2O system.
122 citations
TL;DR: The supercooled liquid vapor pressures of 23 polybrominated diphenyl ether congeners were determined as a function of temperature with a gas chromatographic retention time technique.
Abstract: The supercooled liquid vapor pressures PL of 23 polybrominated diphenyl ether congeners were determined as a function of temperature with a gas chromatographic retention time technique PL at 29815 K ranged from 01 Pa for monobrominated diphenyl ethers to 10-6 Pa for heptabrominated diphenyl ethers The halogen substitution pattern was found to influence PBDE vapor pressure, indicating that congeners with bromine substitutions in the ortho positions to the ether-link have higher vapor pressures The enthalpy of vaporization ΔvapH for the 23 PBDE congeners ranged from (−67 to −116) kJ/mol, decreasing with each additional bromine substitution by about (7 to 8) kJ·mol-1 ΔvapH was also found to be influenced by the number of ortho bromines Using a Junge−Pankow approach, the fraction of chemical adsorbed to aerosols as a function of temperature was estimated for three congeners and used to speculate on the likely environmental behavior of these chemicals
120 citations
TL;DR: In this paper, three-phase equilibria for the carbon dioxide + methane + water system were obtained by employing the isobaric temperature search method, where the ternary hydrate, water-rich liquid, and vapor equilibrium lines generated at different compositions of carbon dioxide and methane were all located between two threephase equilibrium lines of simple hydrates formed by a single guest component.
Abstract: Three-phase equilibria for the carbon dioxide + methane + water system were obtained by employing the isobaric temperature search method. Based on these isobaric hydrate equilibrium studies, the ternary hydrate, water-rich liquid, and vapor equilibrium lines generated at different compositions of carbon dioxide and methane were all located between two three-phase equilibrium lines of simple hydrates formed by a single guest component. The upper quadruple points where the four phases hydrate, water-rich liquid, CO2-rich liquid, and vapor coexist were measured for the composition range of 100−82.50 mol % carbon dioxide. Below 82.50 mol % carbon dioxide, the upper quadruple points do not exist because none of the components in the vapor phase, neither methane nor carbon dioxide, is able to liquefy at these conditions. In addition, two-phase equilibria of vapor and hydrate were also determined at the three different pressures 20, 26, and 35 bar. Judging from the resulting T−x diagram, the concentration of car...
120 citations
TL;DR: In this article, the diffusivities of N2O in aqueous alkanolamine solutions have been measured at (30, 35, and 40) °C, and a simple correlation was used to correlate the diffusion of N 2O in amine solutions.
Abstract: The diffusivities of nitrous oxide (N2O) in aqueous alkanolamine solutions have been measured at (30, 35, and 40) °C. The systems studied are aqueous monoethanolamine, diethanolamine, diisopropanolamine, triethanolamine, and 2-amino-2-methyl-1-propanol solutions. The concentration of amine for monoethanolamine ranges from (1 to 5) kmol·m-3 and for other amines from (0.5 to 2.5) kmol·m-3. The viscosities of diisopropanolamine and triethanolamine and the densities and viscosities of aqueous diisopropanolamine and triethanolamine solutions were also measured at (30, 35, and 40) °C. A simple correlation was used to correlate the diffusivity of N2O in amine solutions. The parameters of the correlation were determined from the measured diffusivity data and the available data in the open literature. The correlation has been shown to represent reasonably the diffusivity of N2O in six aqueous amine solutions: MEA, DEA, DIPA, MDEA, TEA, and AMP. The correlations are, in general, satisfactory for estimating the dif...
TL;DR: In this paper, the authors measured the viscosity of aqueous solutions of α-amino acids (Glycine, dl-alanine, Dl-αamino-n-butyric acid, and dlα-valine) + sodium butyrate + electrolyte at 298.15 K. The data have been used to calculate apparent molar volumes and B-coefficients of the amino acids.
Abstract: Densities and viscosities of aqueous solutions of α-amino acids (glycine, dl-alanine, dl-α-amino-n-butyric acid, dl-α-valine, and dl-α-leucine) + sodium butyrate have been measured as a function of concentrations of amino acid and electrolyte at 298.15 K. These data have been used to calculate apparent molar volumes and viscosity B-coefficients of the amino acids. The standard partial molar volumes, V°2,φ, standard volumes of transfer, ΔtV°, and hydration numbers of the amino acids have been determined. It has been shown that V°2,φ, ΔtV°, and the B-coefficient vary linearly with increasing number of carbon atoms in the alkyl chain of the amino acids, and they were split into contributions from the charged end group (NH3+, COO-) and CH2 groups of the amino acids. From the volumetric data, we found that sodium butyrate interacts strongly with the charged center of the zwitterion of the amino acids and has a strong dehydration effect on the amino acids.
TL;DR: Aqueous solubilities and dissolution rates were reported and examined for 2,4,6,trinitrotoluene (TNT), hexahydro-1,3,5-trinitro- 1, 3, 5-triazine (RDX), and octahydroid-1.3, 5, 7-tetranitro (TTE), 1.3.5, 7.7tetrazocine (HMX) over the pH range of (4.2−6.2) and the temperature range of
Abstract: Aqueous solubilities and dissolution rates are reported and examined for 2,4,6-trinitrotoluene (TNT), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) over the pH range of (4.2−6.2) and the temperature range of (3.1−33.3) °C. Measurements were performed using high-pressure liquid chromatography with ultraviolet detection. Solubilities and dissolution rates were not statistically affected by pH within the experimental design limits. Correlations are proposed to estimate the aqueous solubility of these high explosives as a function of temperature.
TL;DR: In this article, a linear correlation of enthalpies of vaporization of secondary alcohols with the number of C atoms has been found, and the effect of self-association of aliphatic alcohols in the liquid phase is discussed in terms of the difference of (298.15 K) between associating alcohols and their nonassociating alkane homomorphs.
Abstract: The standard molar enthalpies of vaporization of the 14 branched C5 and C6 alkanols 2,2-dimethyl-1-propanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol, 3,3-dimethyl-1-butanol, 2-hexanol, 3-hexanol, 3-methyl-2-pentanol, 4-methyl-2-pentanol, 2-methyl-3-pentanol, 3,3-dimethyl-2-butanol, 2-methyl-2-butanol, 3-methyl-3-pentanol, and 2,3-dimethyl-2-butanol have been determined. The data were obtained from the temperature dependence of the vapor pressure measured by the transpiration method. A linear correlation of enthalpies of vaporization of the secondary alcohols with the number of C atoms has been found. The effect of self-association of aliphatic alcohols in the liquid phase is discussed in terms of the difference of (298.15 K) between associating alcohols and their nonassociating alkane homomorphs.
TL;DR: In this article, the Redlich−Kister equation has been used to estimate the binary fitting parameters, and root-mean-square deviations from the regression lines are shown, and excess molar volumes were fitted as a function of the mole fraction and temperature to a polynomial equation.
Abstract: Density, refractive index on mixing, and speed of sound at 293.15 K, 298.15 K, 303.15 K, and 313.15 K and atmospheric pressure have been measured over the whole composition range for dimethyl carbonate (DMC) + methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, and 1-pentanol. Excess molar volumes, changes of refractive index on mixing, and deviations in isentropic compressibility for the above systems have been calculated. The Redlich−Kister equation has been used to estimate the binary fitting parameters, and root-mean-square deviations from the regression lines are shown. The excess molar volumes were fitted as a function of the mole fraction and temperature to a polynomial equation.
TL;DR: In this paper, the ternary system methane−carbon dioxide−propan... was measured at 230 K and 270 K for the binary systems of carbon dioxide, carbon dioxide−propane, and carbon dioxide-propane.
Abstract: Vapor−liquid equilibria were measured for the binary systems methane−carbon dioxide, methane−propane, and carbon dioxide−propane at 230 K and 270 K. The ternary system methane−carbon dioxide−propan...
TL;DR: In this paper, the development of a large database, and associated computer software, for thermodynamic parameters of chemical reactions in aqueous solution is described, and a computer package is now available that can be informed progressively of new experimental data, critical data evaluations, and established chemical trends so that sound and up to date thermodynamic calculations can be quickly and conveniently performed.
Abstract: The development of a large database, and associated computer software, for thermodynamic parameters of chemical reactions in aqueous solution is described. The aim has been to tackle some of the uncertainties that currently restrict the chemical modeling of aqueous, multicomponent mixtures. A computer package is now available that can be informed progressively of new experimental data, critical data evaluations, and established chemical trends so that sound and up-to-date thermodynamic calculations can be quickly and conveniently performed. This has been accomplished by storing a large amount of (inherently inconsistent) chemical data from the literature and, from this, producing a consistent set of mass balance equations by automatic means. The basis of the chemical and numerical judgments made during this process is briefly outlined. The criteria for selection of the best thermodynamic values and of the best linear combinations of reactions are given particular attention.
TL;DR: In this paper, measurements of the aqueous solubility of 2,4-dinitrotoluene (DNT) and 2.4,6-trinitrotorluene (TNT) are reported.
Abstract: Measurements of the aqueous solubility of 2,4-dinitrotoluene (DNT) and 2,4,6-trinitrotoluene (TNT) are reported. Previous data reported for DNT is sparse, and the values are inconsistent with those reported herein. Data for TNT compare very well with previously reported values, which provides confidence in the methods used.
TL;DR: In this paper, the diffusivity of N2O in aqueous solutions of potassium taurate is investigated over a wide range of concentration and temperature, and a modified Stokes−Einstein relationship is proposed for diffusivities.
Abstract: Solubility and diffusivity of N2O in aqueous solutions of potassium taurate are reported over a wide range of concentration and temperature. Also, the solubility of N2O in aqueous potassium glycinate solution is reported at 295 K. The ion specific constants, based on the model of Schumpe,5,6 are reported for taurate and glycinate anions. A modified Stokes−Einstein relationship is proposed for the diffusivity of N2O in aqueous potassium taurate solution in the temperature range 293−308 K.
TL;DR: In this paper, density, viscosity, and refractive index measurements of pure formamide and of formic, acetic, and propionic acids in the temperature range (298.15 to 313.15) K were made.
Abstract: Density, viscosity, and refractive index measurements of pure formamide and of formic, acetic, and propionic acids in the temperature range (298.15 to 313.15) K were made. Additionally, measurements of the same properties and in the same temperature range were made on the following mixtures: formamide + (formic acid, or + acetic acid, or + propionic acid). The results were fitted to empirical equations, whose calculated values are in agreement with the experimental ones.
TL;DR: This paper measured densities and viscosities for binary mixtures of methanol, ethanol, propan-1-ol, butan-2-ol with nitromethane at temperatures from 293.15 K to 295 K.
Abstract: Densities and viscosities were measured for the binary mixtures of methanol, ethanol, propan-1-ol, propan-2-ol, butan-2-ol, and 2-methyl-propan-2-ol with nitromethane at temperatures from 293.15 K ...
TL;DR: In this article, the authors presented liquid−liquid equilibrium data of butyric acid in the systems water + solvent with tri-n-octylamine as extractant and n-alkanes as diluent, and water + pure nalkanes are presented.
Abstract: Liquid−liquid equilibrium data of butyric acid in the systems water + solvent with tri-n-octylamine as extractant and n-alkanes as diluent, and water + pure n-alkanes are presented. The distribution coefficient is a linear function of the aqueous concentration of butyric acid for pure n-alkanes. For solvents containing trioctylamine, the dependence of the distribution coefficient of butyric acid goes through a maximum at a concentration of butyric acid of about 0.2 kmol·m-3. An overloading of the extractant reaching the value of almost 6 was observed. The loading is independent of the extractant concentration. The experimental data were interpreted by a chemical reaction mechanism and a related model in which the existence of (1,1) to (7,1) acid−amine complexes and a monomer and a dimer of butyric acid in the solvent was supposed. The equilibrium constants of formation of these complexes and the distribution of individual species in the solvent were estimated. This model fits experimental equilibrium data...
TL;DR: In this article, the authors measured the densities and viscosities of 1,4-dioxane with 1,propanol and 2-prolpol mixtures at atmospheric pressure at (25, 30, 35, and 40) °C. The calculated excess volumes (VE) are positive over the whole range of composition in both systems.
Abstract: Densities and viscosities for 1,4-dioxane with 1-propanol and 2-propanol mixtures have been measured as a function of mole fraction at atmospheric pressure at (25, 30, 35, and 40) °C. The calculated excess volumes (VE) are positive over the whole range of composition in both systems. The VE data were fitted by means of a Redlich−Kister type equation. Furthermore, McAllister's three-body-interaction model was used to correlate the kinematic viscosities of these systems.
TL;DR: Using a laser monitoring observation technique, the solubilities of terephthalaldehydic acid, p-toluic acid and isophthalic acid in N-methyl-2-pyrrolidone were determined by the synthetic method from (295.65 to 371.35) K as discussed by the authors.
Abstract: Using a laser monitoring observation technique, the solubilities of terephthalaldehydic acid, p-toluic acid, benzoic acid, terephthalic acid, and isophthalic acid in N-methyl-2-pyrrolidone were determined by the synthetic method from (295.65 to 371.35) K. The experimental results were correlated by an empirical equation.
TL;DR: In this paper, the authors present all known experimental data for the critical constants of oxygen compounds other than alkanols and cycloalkanols, together with their uncertainties, and where appropriate, critical temperatures have been converted to the ITS-90 scale.
Abstract: This is part 7 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 oxygen compounds other than alkanols and cycloalkanols. Experimental data and recommended values are given together with their uncertainties. The uncertainties are relatively small for the compounds of low molar mass that are stable at the critical temperature but are greater for many of the compounds, particularly those of higher molar mass, because they are unstable at the critical temperature. Where appropriate, critical temperatures have been converted to the ITS-90 scale.
TL;DR: In this article, the equilibrium solubilities of five nitrogen-containing drugs carbamazepine, diazepam, codeine, atropine, and lorazepam were measured in supercritical carbon dioxide using a simple and reliable static method.
Abstract: The equilibrium solubilities of five nitrogen-containing drugs carbamazepine, diazepam, codeine, atropine, and lorazepam have been measured in supercritical carbon dioxide using a simple and reliable static method. The measurements were performed in the pressure range (122 to 355) bar at the temperatures (308, 318, 328, 338, and 348) K. The measured solubilities were correlated using a semiempirical model. The calculated results show satisfactory agreement with experimental data.
TL;DR: In this article, the liquid phase adsorption of benzene and toluene on granular activated carbon TOG 20 × 50 has been studied at (303.15, 313.15 and 323.15) K. The temperature dependent forms of the Toth and Sips equations were used to correlate the experimental data.
Abstract: The liquid-phase adsorption of benzene and toluene on granular activated carbon TOG 20 × 50 has been studied at (303.15, 313.15, and 323.15) K. The temperature dependent forms of the Toth and Sips equations were used to correlate the experimental data. Excellent agreement between the experimental data and those two equations are observed.
TL;DR: In this article, the adsorption isotherms for HFC-134a on activated charcoal, in the temperature range of 273-353 K and for pressures up to 0.65 MPa, measured using the volumetric method.
Abstract: This paper presents adsorption isotherms for HFC-134a on activated charcoal, in the temperature range of 273-353 K and for pressures up to 0.65 MPa, measured using the volumetric method. Three samples of charcoals with widely varying surface areas were chosen. The shapes of the isotherms,obtained from the experimental data were similar in all cases and comparable to those reported in the literature. Adsorption parameters were evaluated from the isotherms using the Dubinin-Astakhov (DA) equation. The concentration dependence of the isosteric enthalpies of adsorption is extracted from the data.
TL;DR: In this paper, the gas−liquid solubility of hydrogen in methanol, ethanol, 1-propanol, and 1-butanol at pressures in the range 3.6 to 10 MPa and at temperatures of 298.15 to 525.15 K has been measured in an autoclave type phase equilibrium apparatus using the total pressure method.
Abstract: The gas−liquid solubility of hydrogen in methanol, ethanol, 1-propanol, and 1-butanol at pressures in the range 3.6 to 10 MPa and at temperatures in the range 298.15 to 525.15 K has been measured in an autoclave type phase equilibrium apparatus using the total pressure method. Pseudo-Henry's law constants, , were calculated. The solubility of hydrogen increases with increasing temperature and pressure for all solvents used, and it also increases as the carbon chain length of the alcohol molecule increases.
TL;DR: In this article, the solubilities of phenol and pyrocatechol (1,2-dihydroxybenzene) in supercritical carbon dioxide were measured over the temperature range from 333.15 k to 363.15 K and the pressure range from 100 bar to 350 bar.
Abstract: The solubilities of phenol and pyrocatechol (1,2-dihydroxybenzene) in supercritical carbon dioxide were measured over the temperature range from 333.15 K to 363.15 K and the pressure range from 100 bar to 350 bar. The data were obtained using a recirculating equilibrium apparatus, which was tested by measuring the solubility of naphthalene in supercritical carbon dioxide. The measured solubilities were correlated using a semiempirical model proposed by Bartle.