Showing papers in "Journal of Chemical & Engineering Data in 2003"
TL;DR: In this paper, the authors present experimental results for the solubility of carbon dioxide in the ionic liquid 1-N-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) for temperatures from (293 to 393) K and pressures up to about 9.7 MPa.
Abstract: New experimental results are presented for the solubility of carbon dioxide in the ionic liquid 1-N-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) for temperatures from (293 to 393) K and pressures up to about 9.7 MPa. Solubility pressures are correlated by means of the extended Henry's law.
389 citations
TL;DR: In this paper, the authors measured the capacity of 1-butyl-3-methylimidazolium hexafluorophosphate (C4mim][PF6) in a range of temperatures from (5 to 550) K, based on measurements by calorimetry.
Abstract: Thermodynamic functions for 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim][PF6]) are reported in a range of temperatures from (5 to 550) K, based on new measurements by calorimetry. Heat capacities of the crystal, glass, and liquid phases for [C4mim][PF6] were measured with a pair of calorimeters. A vacuum-jacketed adiabatic calorimeter was used at temperatures between (5 and 310) K, and a heat bridge-scanning calorimeter was used from (300 to 550) K. With the adiabatic calorimeter, the fusion Tfus = 283.51 K, = 19.60 kJ·mol-1, and the glass transition Tg = 190.6 K were observed. The [C4mim][PF6] test sample was determined to have a mole fraction purity of 0.9956 by a fractional melting analysis. Densities of the liquid were measured in a range of temperatures from (298 to 353) K with a pycnometer equipped with a capillary neck. An unexpected endothermal transition, with a very small enthalpy change of 0.25 J·g-1 (0.071 kJ·mol-1), was observed in a range of temperatures from (394 to 412) K. He...
255 citations
TL;DR: In this paper, a general and fast method for the prediction of thermophysical data of liquids, called COSMO-RS, is used for the calculation of activity coefficients at infinite dilution for 38 compounds in the ionic liquids.
Abstract: COSMO-RS, a general and fast method for the prediction of thermophysical data of liquids, is used for the calculation of activity coefficients at infinite dilution for 38 compounds in the ionic liquids 1-methyl-3-ethylimidazolium bis((trifluoromethyl)sulfonyl)imide, 1,2-dimethyl-3-ethylimidazolium bis((trifluoromethyl)sulfonyl)imide, and 4-methyl-N-butylpyridinium tetrafluoroborate. Calculated values for (314 and 344) K are presented and compared with experimental data.
227 citations
TL;DR: The ThermoML as mentioned in this paper is an XML-based approach for storage and exchange of experimental and critically evaluated thermophysical and thermochemical property data, which covers essentially all experimentally determined thermodynamic and transport property data for pure compounds, multicomponent mixtures, and chemical reactions.
Abstract: ThermoML is an XML-based approach for storage and exchange of experimental and critically evaluated thermophysical and thermochemical property data. Extensions to the ThermoML schema for the expression of uncertainties are described. Basic principles, scope, and description of all new structural elements are discussed. Representation of upper and lower limits for property values is also addressed. ThermoML covers essentially all experimentally determined thermodynamic and transport property data (more than 120 properties) for pure compounds, multicomponent mixtures, and chemical reactions (including change-of-state and equilibrium). Properties of polymers and radicals and some properties of ionic systems are not represented at present. The present role of ThermoML in global data submission and dissemination is discussed with particular emphasis on cooperation between major journals in the field and the Thermodynamics Research Center (TRC) at the National Institute of Standards and Technology. The text of ...
202 citations
TL;DR: ThermoML as mentioned in this paper is an XML-based approach for storage and exchange of experimental and critically evaluated thermophysical and thermochemical property data, including change-of-state and equilibrium.
Abstract: ThermoML is an XML-based approach for storage and exchange of experimental and critically evaluated thermophysical and thermochemical property data. The basic principles, scope, and description of all structural elements of ThermoML are discussed. ThermoML covers essentially all experimentally determined thermodynamic and transport property data (more than 120 properties) for pure compounds, multicomponent mixtures, and chemical reactions (including change-of-state and equilibrium). The primary focus at present is molecular compounds. Although the focus of ThermoML is properties determined by direct experimental measurement, ThermoML does cover key derived property data such as azeotropic properties, Henry's Law constants, virial coefficients (for pure compounds and mixtures), activities and activity coefficients, fugacities and fugacity coefficients, and standard properties derived from high-precision adiabatic heat-capacity calorimetry. The role of ThermoML in global data submission and dissemination is...
194 citations
TL;DR: In this article, the measurements of the solubility of carbon dioxide and oxygen in a commonly used room temperature ionic liquid, butyl methyl imidazolium tetrafluoroborate ([bmim][BF4]), are reported as a function of temperature between 303 K and 343 K and at pressures close to atmospheric.
Abstract: The measurements of the solubility of carbon dioxide and oxygen in a commonly used room temperature ionic liquid, butyl methyl imidazolium tetrafluoroborate ([bmim][BF4]), are reported as a function of temperature between 303 K and 343 K and at pressures close to atmospheric. A new experimental apparatus, based on a saturation method, is presented. The solubility is expressed in terms of molarities, mole fractions, and Henry's law coefficients. From their variation with temperature, the partial molar thermodynamic functions of solvation such as the standard Gibbs energy, the enthalpy, and the entropy are calculated. The precision of the experimental data, considered as the average absolute deviation of the Henry's law coefficients from appropriate smoothing equations, is 4% for oxygen and 3% for carbon dioxide.
186 citations
TL;DR: In this article, phase diagrams determined by the cloud point method at 25 °C, including tie lines assigned from mass phase ratios according to the lever arm rule, are presented for several poly(ethylene glycol) (P...
Abstract: Phase diagrams determined by the cloud point method at 25 °C, including tie lines assigned from mass phase ratios according to the lever arm rule, are presented for several poly(ethylene glycol) (P...
183 citations
TL;DR: In this article, the melting point, enthalpy of fusion, and enthalpies of solid−solid phase transitions were determined by differential scanning calorimetry (DSC).
Abstract: The solubilities of 1-ethyl-3-methylimidazolium hexafluorophosphate, [emim][PF6], in aromatic hydrocarbons (benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene) and of 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], in the same aromatic hydrocarbons, in n-alkanes (pentane, hexane, heptane, octane), and in cyclohydrocarbons (cyclopentane, cyclohexane) have been measured by a dynamic method from 290 K to the melting point of the ionic liquid or to the boiling point of the solvent. The melting point, enthalpy of fusion, and enthalpies of solid−solid phase transitions were determined by differential scanning calorimetry (DSC). The solubilities of [emim][PF6] and [bmim][PF6] in aromatic hydrocarbons decrease with an increase of the molecular weight of the solvent. The differences of the solubilities in o-, m-, and p-xylene are not significant. The intermolecular solute−solvent interactions are very small. The liquidus curves were correlated by means of the UNIQUAC and NRTL equations, uti...
177 citations
TL;DR: In this article, the density, viscosity, and thermal conductivity properties of different types of glycol + water mixtures were measured at temperatures ranging from 290 K to 450 K and concentrations ranging from 25 mol % glycol to 100 mol% glycol.
Abstract: The density, viscosity, and thermal conductivity of ethylene glycol + water, diethylene glycol + water, and triethylene glycol + water mixtures were measured at temperatures ranging from 290 K to 450 K and concentrations ranging from 25 mol % glycol to 100 mol % glycol. Our data were generally in agreement with the limited data available in the literature and were correlated using simple empirical expressions and the generalized corresponding states principle (GCSP). The GCSP method, with two adjustable parameters for each property, offers the potential for judicious extrapolation of density and transport property data for all glycol + water mixtures.
177 citations
TL;DR: Experimental densities, dynamic viscosities, speeds of sound, and relative permittivities for six binary mixtures of water + alkanediols were measured across the whole composition range and in the temperature range (298.15 to 338.15) K as mentioned in this paper.
Abstract: Experimental densities, dynamic viscosities, speeds of sound, and relative permittivities for six binary mixtures of water + alkanediols (propane-1,2- and -1,3-diol and butane-1,2-, -1,3-, -1,4-, and -2,3-diol) were measured across the whole composition range and in the temperature range (298.15 to 338.15) K. The deviations in dynamic viscosities, excess isentropic compressibilities, and deviations in relative permittivities were also calculated and fitted to a Redlich−Kister type equation. The partial molar volumes at infinite dilution for the water in six binary mixtures and the differences in these values among various diol isomers were calculated and examined to ascertain structural information on the water molecules around various diols. The variation of the Kirkwood correlation factor was also examined across the whole composition range of the mixtures.
171 citations
TL;DR: In this article, an apparatus for measuring liquid−liquid equilibria of small samples of liquid mixtures with relatively high differences in density and viscosity was applied for studying mixtures of the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and the three alcohols propan-1-ol, butan-one-ol and pentan- 1-ol.
Abstract: An apparatus for measuring liquid−liquid equilibria of small samples of liquid mixtures with relatively high differences in density and viscosity was applied for studying mixtures of the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and the three alcohols propan-1-ol, butan-1-ol, and pentan-1-ol. The synthetic method has been applied where cloud points at a given composition were determined by varying the temperature. The point of phase splitting was detected by light scattering. Data in the temperature range 281 K to 340 K have been obtained for the three systems.
TL;DR: In this paper, the liquid−liquid phase equilibria of mixtures of room-temperature ionic liquids, 1-alkyl-3-methylimidazolium hexafluorophosphate, [Rnmim][PF6] (1) where Rn = butyl, pentyl, hexyl, heptyl, and octyl, with butan-1-ol (2) over a composition range have been measured.
Abstract: Room-temperature ionic liquids are salts that are liquid at room temperature. Their use as catalysts and catalytic support has been studied extensively. However, there are very few measurements on their solubility and phase equilibria in common organic solvents. In this work, the liquid−liquid phase equilibria of mixtures of room-temperature ionic liquids, 1-alkyl-3-methylimidazolium hexafluorophosphate, [Rnmim][PF6] (1) where Rn = butyl, pentyl, hexyl, heptyl, and octyl, with butan-1-ol (2) over a composition range have been measured. The binodal coexistence curves of the mixtures were found to have an upper critical solution temperature (USCT) at x2 ≈ 0.9. The UCST decreases with increase in the length of the alkyl chain of the ionic liquid, with the UCST of the butyl at 373 K and that of the octyl at 326 K. Both the UCST and the composition at the UCST as a function of the 1-alkyl group chain length can be reasonably well predicted from theory on the basis of unimolecular quantum chemical calculations.
TL;DR: In this article, the solubility of CO2 in NaCl solutions with mass fractions of 0.01 to 0.03 was measured at (30 to 60) °C and (10 to 20) MPa.
Abstract: The solubility of CO2 in NaCl solutions with mass fractions of 0.01 to 0.03 was measured at (30 to 60) °C and (10 to 20) MPa. The CO2 was dissolved in NaCl solution in a pressurized vessel, and a sample of the saturated solution was removed from the vessel. The solubility was then estimated by measuring the mass of the sample and the pressure of the dissolved gas. On the basis of this experimental data, an equation for predicting the CO2 mole fraction x1 in NaCl solution as a function of temperature t = (30 to 60) °C, pressure P = (10 to 20) MPa, and mass fraction, S, of NaCl = (0.01 to 0.03) was determined. H(P,T,S)/MPa = 36.1P/MPa + 3.87T/K − 1097.1 + (196P/MPa + 26.9T/K − 8810)S, where H is Henry's coefficient, H = Pc/x1, Pc is the partial pressure of carbon dioxide, T is the absolute temperature, and S is the mass fraction of NaCl in the aqueous solution.
TL;DR: Adsorption equilibria of single components for pure methane, ethane, ethylene, hydrogen, and nitrogen onto activated carbon adsorbent (Calgon Co) were measured with a static volumetric method at 293.15 K, 303.15 k, and 313.15k and at pressures up to 2 MPa as discussed by the authors.
Abstract: Adsorption equilibria of single components for pure methane, ethane, ethylene, hydrogen, and nitrogen onto activated carbon adsorbent (Calgon Co.) were measured. The results were obtained with a static volumetric method at 293.15 K, 303.15 K, and 313.15 K and at pressures up to 2 MPa. Experimental data were correlated by the Langmuir−Freundlich equation. Isosteric enthalpies of adsorption were calculated and shown according to surface loading.
TL;DR: In this article, the surface tension and density of toluene + heptane and N,N-dimethylformamide+toluene at atmospheric pressure were measured over a temperature range.
Abstract: The pendant drop method, combined with efficient temperature control of the measuring cell, allows high precision in surface tension measurements. The surface tensions of heptane, toluene, N,N-dimethylformamide, cyclohexane, N-methyl-2-pyrrolidone, and propanone were measured as a function of temperature using the pendant drop method. The results were compared with literature data. The surface tension and density of toluene + heptane and N,N-dimethylformamide + toluene at atmospheric pressure were measured over a temperature range. Gibbs excess surface concentrations are derived from the experimental surface tensions, and the influence of activity coefficients is discussed.
TL;DR: The densities and viscosities of aqueous blends of N-methyldiethanolamine (MDEA) and 2-amino-2-methyl-1-propanol with monoethanolamine (MEA) were measured at (25, 30, 35, 40, 45, and 50) °C as mentioned in this paper.
Abstract: The densities and viscosities of aqueous blends of N-methyldiethanolamine (MDEA) and 2-amino-2-methyl-1-propanol with monoethanolamine (MEA) and diethanolamine (DEA) have been measured at (25, 30, 35, 40, 45, and 50) °C. The total amine strength in the solution was kept at 30 mass % in view of recent interest in using concentrated amine solutions in gas treating. Correlations for the density and viscosity of the ternary mixtures are presented.
TL;DR: In this article, the authors measured experimental densities, viscosities, and heat capacities at different temperatures for the entire mole fraction range for the binary mixture of ethylene glycol + water.
Abstract: Experimental densities, viscosities, and heat capacities at different temperatures were measured over the entire mole fraction range for the binary mixture of ethylene glycol + water. Density values were used in the determination of excess molar volumes, VE. The excess volumes, VE, are fitted as a function of the mole fraction to a polynomial. Δη was fitted to the Redlich−Kister equation. The excess volumes are negative over the entire composition at the lower temperatures. They show a U-shaped concentration dependence and decrease in absolute value with increasing temperature. At high temperatures, the excess molar volume shows an S-shaped dependence. Δη values are negative over the entire range of mole fraction and have a very similar trend to that for VE. The heat capacities of mixtures have the maximum values at x1= 0.0312.
TL;DR: Results show that cellular wall breaking has an important effect on extraction efficiency for the astaxantine extraction, and the extraction yield is much below the expected lipid content in dry Hae.
Abstract: Astaxantine from the microalga Haematococcus pluvialis and phycocyanine from the microalga Spirulina maxima have been obtained by supercritical extraction using carbon dioxide. Prior to extraction, the samples of microalgae were crushed by cutting mills (coffee mill) and then manually ground with dry ice (solid carbon dioxide). The Haematococcus extracts were analyzed by liquid chromatography, using astaxantin (purity of 98%) as a standard. Phycocyanine, being insoluble in carbon dioxide, was indirectly separated. Thus, lipid-soluble substances from spirulina were extracted and analyzed by liquid chromatography, using as a standard a solution prepared on the base of reagent (purity of 40%). For the astaxantine extraction, the results show that cellular wall breaking has an important effect on extraction efficiency. The addition of a cosolvent (9.4 mass % of ethanol) has little effect, reaching an extraction yield of about 1.7 mass %. The extraction yield is much below the expected lipid content in dry Hae...
TL;DR: In this article, the activity coefficients at infinite dilution for both polar and nonpolar solutes in the ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate have been determined by gas−liquid chromatography at the temperatures (298.15, 313.15) K and the selectivity values were calculated from the values obtained over the temperature range.
Abstract: Ionic liquids, with their very low vapor pressures and unique solvent properties, are potentially useful solvents for separating organic liquid mixtures by solvent extraction or by extractive distillation. In this work, the activity coefficients at infinite dilution, , for both polar and nonpolar solutes in the ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate have been determined by gas−liquid chromatography at the temperatures (298.15, 313.15, 323.15) K. The partial molar excess enthalpies at infinite dilution and the selectivity values were calculated from the values obtained over the temperature range. The selectivity values have been determined and are used to predict the solvent potential of the ionic liquid for the separation of liquid mixtures by extractive distillation.
TL;DR: In this paper, measurements on densities, speeds of sound, viscosities, and relative permittivities for 21 binary mixtures of alkoxyethanols were reported.
Abstract: Measurements on densities, speeds of sound, viscosities, and relative permittivities for 21 binary mixtures of alkoxyethanols (2-methoxyethanol, 2-ethoxyethanol, and 2-butoxyethanol) + benzene, + toluene, + (o-, m-, and p-) xylenes, + ethylbenzene, and + cyclohexane at different temperatures are reported. The excess molar volumes, excess isentropic compressibilities, deviations in dynamic viscosities, speeds of sound, and relative permittivities have been calculated across the mole compositions. The compositional variation of excess and deviation functions has been expressed in terms of the Redlich−Kister equation.
TL;DR: In this article, the adsorption equilibria of water vapor on Al2O3, zeolite 13X, and a Zeolite X/activated carbon composite (Zeocarbon) were measured by a static volumetric method.
Abstract: The adsorption equilibria of water vapor on Al2O3, zeolite 13X, and a zeolite X/activated carbon composite (Zeocarbon) were measured by a static volumetric method. The equilibrium experiments were conducted at (293.2, 313.2, 333.1, and 353.1) K and pressures up to 2.1 kPa for Al2O3 and 2.3 kPa for zeolite 13X and Zeocarbon, respectively. The experimental data obtained were correlated by the Aranovich and Donohue (A−D) and n-layer BET models.
TL;DR: In this paper, the Redlich−Kister type equation has been used to calculate deviation functions, such as deviations in speeds of sound and deviations in relative permittivities, and excess functions such as excess molar volumes and excess isentropic compressibilities.
Abstract: New experimental data on densities at (298.15 to 313.15) K, viscosities, speeds of sound, and relative permittivities at (298.15 and 308.15) K for the 10 binary mixtures of alkyl (methyl, ethyl, butyl, and isoamyl) acetates + glycols (ethylene, diethylene, triethylene, and propylene) have been measured as a function of the composition. Deviation functions, such as deviations in speeds of sound and deviations in relative permittivities, and excess functions, such as excess molar volumes and excess isentropic compressibilities, were calculated and fitted to a Redlich−Kister type equation. Grunberg−Nissan, McAllister, and Auslander equations correlated the mixture viscosities adequately. The values of speeds of sound in these mixtures, as predicted by collision factor theory, matched well with experimental data. The variation of the Kirkwood correlation factor with the ester mole fraction was examined. A qualitative analysis of the deviation and excess functions was made to ascertain the nature and type of b...
TL;DR: In this paper, the effectiveness of extracting an alkanol from mixtures containing an alkane using the solvent 1-methyl-3-octylimidazolium chloride is discussed in terms of the ratio of the solubilities in the two phases.
Abstract: Ternary liquid−liquid equilibria for the mixtures (1-methyl-3-octylimidazolium chloride + an alkanol + an alkane) at 298.2 K are reported. The alkanes used were heptane, dodecane, and hexadecane, and the alkanols were methanol and ethanol. The solubility of the alkanol is higher in the ionic liquid rich phase than in the alkane rich phase. The effectiveness of extracting an alkanol from mixtures containing an alkane using the solvent 1-methyl-3-octylimidazolium chloride is discussed in terms of the ratio of the solubilities in the two phases. The NRTL equation was used to correlate the experimental tie lines. There are no data in the literature for the mixtures discussed in this paper.
TL;DR: In this article, the experimental data on methane, nitrogen, oxygen, and air hydrates were used in optimizing the Kihara potential parameters for oxygen hydrate, and the hydrate stability zone of oxygen and nitrogen was predicted.
Abstract: Air hydrates can form at high-pressure and low-temperature conditions found in deep ice sheets of Arctic and Antarctic regions. These hydrates can play a major role in analyzing the data gathered in these regions. However, there are limited experimental data and thermodynamic modeling on air hydrates. In this work, we present new experimental data on methane, nitrogen, oxygen, and air hydrates. An experimental setup based on a quartz crystal microbalance (QCM) has been used in measuring all the experimental data reported in this work. The QCM method needs much smaller samples, resulting in a significant reduction in the time required for each experiment. The available data on oxygen hydrates are used in optimizing the Kihara potential parameters for oxygen hydrates. Using the previously reported nitrogen Kihara potential parameters and the optimized Kihara potential parameters for oxygen, the hydrate stability zone of air hydrates (21 mol % oxygen and 79 mol % nitrogen) has been predicted. The predictions...
TL;DR: In this article, the activity coefficients at infinite dilution for both polar and nonpolar solutes in an ionic liquid, 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM+][BF4-]), have been determined by gas−liquid chromatography at T = (298.15 K and 323.15 k).
Abstract: The activity coefficients at infinite dilution, , for both polar and nonpolar solutes in an ionic liquid, 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM+][BF4-]), have been determined by gas−liquid chromatography at T = (298.15 K and 323.15 K). This work is part of our research focus on ionic liquids. The selectivity values have been calculated at T = 298.15 K, and the results indicate that the ionic liquid, [HMIM+][BF4-], should be a good solvent for separation of benzene and alkanes. The partial molar excess enthalpy values at infinite dilution have also been determined at T = 298.15 K and have been discussed in terms of intermolecular interactions. The results have been discussed in terms of measurements of , using other ionic liquids, taken from the recent literature.
TL;DR: In this article, the surface tension and refractive index for binary mixtures of {octane + ethanol, + 1-propanol,+ 1-butanol, + butanol, plus 1-pentanol, and + 1hexanol, respectively, were measured at T = 298.15 K.
Abstract: Surface tension and refractive index for binary mixtures of {octane + ethanol, + 1-propanol, + 1-butanol, + 1-pentanol, + 1-hexanol, + 1-heptanol, and + 1-octanol}, and density for {octane + ethanol} have been measured at T = 298.15 K for the whole composition range. From the experimental data we extract excess molar volumes, surface tension deviations, and changes of refractive index. All these experimental data are compared among them and with previous results of the binary mixtures hexane + 1-alkanol and dibutyl ether + 1-alkanol. Also we compare our present results with other published data when available.
TL;DR: In this paper, the surface tension data of binary mixtures of ethanol + ethylene glycol were measured over the entire concentration range at temperatures from 20 to 50 °C, and the experimental values were correlated with temperature and with mole fraction.
Abstract: Surface tension data of binary mixtures of ethanol + ethylene glycol were measured over the entire concentration range at temperatures from 20 to 50 °C. The experimental values were correlated with temperature and with mole fraction. The values of the excess surface tension for these mixtures were also calculated.
TL;DR: The conductivities and viscosities of the room-temperature ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) + water + ethanol and [bmim] + water+ acetone ternary mixtures were determined in this paper.
Abstract: The conductivities and viscosities of the room-temperature ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) + water + ethanol and [bmim][PF6] + water + acetone ternary mixtures were determined in the temperature range from 288.15 K to 308.15 K, and the mole fraction of the solvents in the mixtures was up to 0.48. The conductivities of the mixtures increased with increasing concentration of the solvents and temperature in the solvent concentration range studied. An increase in temperature or solvent concentration results in reduction in the viscosities of the mixtures.
TL;DR: In this article, the binodal curves were described using a three-parameter equation, and the tie lines were satisfactorily described using the Othmer−Tobias and Bancroft equations.
Abstract: Liquid−liquid equilibrium data of poly(ethylene glycol) 6000 + potassium citrate + water have been measured at (25, 30, and 35) °C. The binodal curves were described using a three-parameter equation, and the tie lines were satisfactorily described using the Othmer−Tobias and Bancroft equations.
TL;DR: In this article, the experimental data of kinematic viscosity and heat capacity were used to evaluate the predictive capability of some estimation methods of the literature, and experimental data were correlated with temperature using empirical polynomial equations.
Abstract: Liquid densities and heat capacities at 1 MPa, and kinematic viscosities at atmospheric pressure of monoethylene glycol diethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, triethylene glycol dibutyl ether, and dipropylene glycol dimethyl ether were measured in the temperature range (283.15 to 423.15) K. For each substance, experimental data were correlated with temperature using empirical polynomial equations. The experimental data of kinematic viscosity and heat capacity were used to evaluate the predictive capability of some estimation methods of the literature.