Showing papers in "Journal of Chemical & Engineering Data in 1993"
TL;DR: In this paper, the Taylor dispersion technique was applied for the determination of diffusion coefficients of various systems and correlations for the diffusion coefficient as a function of temperature at different concentrations are given.
Abstract: The Taylor dispersion technique was applied for the determination of diffusion coefficients of various systems. Experiments with the system KCl in water showed that the experimental setup provides accurate data. For the alkanolamines monoethanolamine (MEA), diethanolamine (DEA), methyldiethanolamine (MDEA), and di-2-propanolamine (DIPA), correlations for the diffusion coefficient as a function of temperature at different concentrations are given. A single relation for every amine has been derived which correlates the diffusion coefficients as a function of temperature and concentration. The temperature was varied between 298 and 348 K, and the concentration between 0 and 4000-5000 mol/m3. Furthermore, a modified Stokes-Einstein relation is presented for the prediction of the diffusion coefficients in the alkanolamines in relation to the viscosity of the solvent and the diffusion coefficient at infinite dilution. The diffusion coefficients at low concentrations are compared with some available relations for the estimation of diffusion coefficients at infinite dilution, and it appears that the agreement is fairly good.
217 citations
TL;DR: In this article, the authors measured the viscosities, refractive indices, and speeds of sound of binary mixtures of methyl acetoacetate with methyl alcohol, ethyl alcohol, 1-propanol, 2-pro panol, two-methyl-1-polypropanol, one-butanol, 1 -pentanol, and 1-heptanol.
Abstract: Densities, viscosities, refractive indices, and speeds of sound have been measured at 298.15, 303.15, and 308.15 K for the binary mixtures of methyl acetoacetate with methyl alcohol, ethyl alcohol, 1-propanol, 2-propanol, 2-methyl-1-propanol, 1-butanol, 1-pentanol, 1-heptanol, 1-heptanol, and 2-octanol. From these results, excess molar volumes, excess molar refractions, viscosity deviations, and isentropic compressibility deviations have been calculated. These results are further Pitted to the polynomial relation to estimate the coefficients and standard errors
190 citations
TL;DR: In this paper, a flow calorimeter is described and excess enthalpy data are given for the test systems n-hexane + cyclohexane, benzene + cycloencane, and methanol + water at 298.15 K as well as for 1,1,1-trichloroethane+ n-pentane, + n-heptane, etc.
Abstract: Excess enthalpies provide quantitative information about the temperature dependence of the excess Gibbs energy G[sup E]. This information should therefore be used together with other results (vapor-liquid equilibria, liquid-liquid equilibria, limiting activity coefficients, and azeotropic data) for fitting simultaneously temperature-dependent G[sup E] model parameters or interaction parameters of group contribution methods. Although a large number of H[sup E] measurements have been published, results at temperatures other than 298.15 K are scarce. In this paper a flow calorimeter is described, and excess enthalpy data are given for the test systems n-hexane + cyclohexane, benzene + cyclohexane, and methanol + water at 298.15 K as well as for 1,1,1-trichloroethane + n-pentane, + n-heptane, + acetone, + 2-butanone, + methyl acetate, and + ethyl acetate at 363.15 K. These results were used for the systematic development of the group contribution method (modified UNIFAC) developed at Dortmund.
149 citations
TL;DR: In this paper, three-phase equilibrium conditions of carbon dioxide in electrolyte solutions containing NaCl, KCl, CaCl[sub 2], and their binary mixtures and in a synthetic sea water were experimentally obtained in the temperature range of 259-281 K and in the pressure range of 0.9-4.1 MPa using a pressure search'' method.
Abstract: Information on the hydrate-forming conditions for natural gas components and their mixtures is vital to the oil and gas industry. Formation of hydrates in gas pipelines and processing equipment could lead to catastrophic consequences. This information is also essential to the industry for the exploitation of the huge naturally occurring gas reserves in the form of hydrates and for drilling through the hydrate zones. Three-phase equilibrium conditions (aqueous solution + vapor + hydrate) of carbon dioxide in electrolyte solutions containing NaCl, KCl, CaCl[sub 2], and their binary mixtures and in a synthetic sea water were experimentally obtained in the temperature range of 259--281 K and in the pressure range of 0.9--4.1 MPa using a pressure search'' method. The ionic strengths of the solutions ranged from 0.41 to 6.74 m.
135 citations
TL;DR: In this paper, the experimental binary data were correlated by the NRTL equation and the ternary system methanol+ethanol+water was predicted by means of the binary parameters with good accuracy.
Abstract: Vapor-liquid equilibrium data for methanol+ethanol+water and its three constituent binary systems methanol+ethanol, ethanol+water, and methanol+water were measured at 101.3 kPa using a liquid-vapor ebullition-type equilibrium still. The experimental binary data were correlated by the NRTL equation. The ternary system methanol+ethanol+water was predicted by means of the binary NRTL parameters with good accuracy
134 citations
TL;DR: In this article, the authors used the Korea Science and Engineering Foundation and University Awards Program of the Korea Advanced Institute of Science and Technology (KAISTE) to support the study.
Abstract: This work was supported by the Korea
Science and Engineering Foundation and University Awards Program
of the Korea Advanced Institute of Science and Technology
115 citations
TL;DR: In this article, experimental measurements were reported for the dynamic viscosity and the density of four binary mixtures of n-butylamine with methanol, ethanol, 1-propanol, and 1-butanol.
Abstract: Experimental measurements are reported for the dynamic viscosity and the density of the four binary mixtures of n-butylamine with methanol, ethanol, 1-propanol, and 1-butanol. The measurements were conducted at 25 o C and in a pressure range from atmospheric to 720 bar for the dynamic viscosity and from atmospheric to 300 bar for the density. The self-centering falling body viscometer used is described in detail. Calculated excess volumes, compressibilities, and excess viscosities are also reported. The systems studied, besides self-association, exhibit very strong cross-association due to the strong hydrogen bonding between the hydroxyl and the amine groups
113 citations
TL;DR: In this paper, a linear relationship between the logarithm of the solubility of octacosane and triacontane in supercritical carbon dioxide at temperatures between 35 and 45 o C and pressures between 80 and 275 bar was obtained.
Abstract: Solubilities of solid octacosane and triacontane in supercritical carbon dioxide at temperatures between 35 and 45 o C and pressures between 80 and 275 bar have been measured. The results are correlated using the model proposed by Chrastil, and as predicted by this model, a linear relationship between the logarithm of the solubility and the logarithm of the density of carbon dioxide was obtained
100 citations
TL;DR: In this article, the solubility and diffusivity of N[sub 2]O in 0.5, 1, 1.5 and 2 mol/l 2amino-2-methyl-1-propanol in water were measured over a range of temperatures and at atmospheric pressure and correlated.
Abstract: Alkanolamines have become one of the most important classes of chemicals for the removal of acid gas components, H[sub 2]S and CO[sub 2], from natural gases and synthesis gas streams. The solubility and diffusivity of N[sub 2]O in 0.5, 1, 1.5, and 2 mol/l 2-amino-2-methyl-1-propanol in water were measured over a range of temperatures and at atmospheric pressure and correlated. The N[sub 2]O analogy was used to estimate the solubility and diffusivity of CO[sub 2] in aqueous solutions of 2-amino-2-methyl-1-propanol.
98 citations
TL;DR: In this article, the coexistence curve and physical property data (densities, viscosities, surface tensions, and interfacial tensions of the equilibrated coexisting phases) for 2,6-lutidine+water have been determined over the range 34-60 o C, and the density and viscosity differences calculated.
Abstract: The coexistence curve and physical property data (densities, viscosities, surface tensions, and interfacial tensions of the equilibrated coexisting phases) for 2,6-lutidine+water have been determined over the range 34-60 o C, and the density and viscosity differences calculated. The compositions were determined through the refractive index at 22 o C, densities by a commercial electronic oscillating U-tube, viscosities by a U-tube viscometer, surface tensions by a du Nouy ring method, and interfacial tensions by a spinning drop interfacial tensiometer
91 citations
TL;DR: The first phase equilibrium data for mixtures of heavier liquid hydrocarbons+methane forming structure H hydrates were reported in this paper, which suggests the possibility of the natural occurrence of structure H hyddrates in such natural and artificial environments.
Abstract: The first phase equilibrium data are reported for mixtures of heavier liquid hydrocarbons+methane forming structure H hydrates. Four-phase equilibrium conditions (water, liquid hydrocarbon, vapor, and structure H hydrate) were measured for three systems: methane+2,2-dimethylbutane, methane+2-methylbutane, and methane+methylcyclohexane. These hydrocarbons constitute a small fraction of crude of reservoirs where they coexist with various gases, including methane. Consequently this work suggests the possibility of the natural occurrence of structure H hydrates in such natural and artificial environments, and these initial phase equilibrium data have the potential to impact industrial perspectives about hydrates
TL;DR: A Dvorak-Boublik recirculating still has been used to measure isothermal vapor-liquid equilibrium data for 1,2-ethanediol+water and for five different glycol ether+water systems as mentioned in this paper.
Abstract: A Dvorak-Boublik recirculating still has been used to measure isothermal vapor-liquid equilibrium data for 1,2-ethanediol+water and for five different glycol ether+water systems. The glycol ethers are 2-methoxyethanol, 2-ethoxyethanol, 1-methoxy-2-propanol, 2-isoproporyethanol, and 2-butoxyethanol. Each system has been measured at two temperatures in the range 343.15-368.15 K. The reliability of the data has been checked by using a maximum likelihood data reduction
TL;DR: In this paper, the viscosity of six saturated liquids and three mixtures of these liquids over a temperature range from 250 to 330 K were reported for a set of halogenated compounds.
Abstract: Data are reported for the viscosity of six saturated liquids and three mixtures of these liquids over a temperature range from 250 to 330 K. The liquids studied are the halogenated compounds 1,1,1,2 tetrafluoroethane (R134a), bis(difluoromethyl) ether (RE134), 2-(difluoromethoxy)-1,1,1-trifluoroethane (RE245), pentafluoroethane (R125), 1-chloro-1,2,2,2-tetrafluoroethane (R124), and difluoromethane (R32). The mixtures studied are R125+R134a, R32+R134a, and R32+R124, all at approximatively 50% mole fraction
TL;DR: In this paper, the Ostwald coefficients L 2,1 of He, Ne, Ar, Kr, Xe, N 2, O 2, CH 2, CF 4, and SF 6 were determined in several homologous alkan-1-ols, n-C l H 2l+1 OH, 1≤l≤11.
Abstract: The Ostwald coefficients L 2,1 of He, Ne, Ar, Kr, Xe, N 2 , O 2 , CH 2 , CF 4 , and SF 6 dissolved in several homologous alkan-1-ols, n-C l H 2l+1 OH, 1≤l≤11, have been determined at 298.15 K and atmospheric pressure. Altogether, 102 gas/liquid systems were investigated. The medium precision apparatus (about ±0.5%) was of the BenNaim/Baer type, similar to our recently published design. 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 is shown, and several correlations between L 2,1 (and/or the derived Henry fugacity H 2,1 ) and appropriate molecular and/or bulk properties of the gases and solvents are discussed
TL;DR: In this article, the reliability of experimental tie-line data was ascertained through an Othmer-Tobias plot and distribution coefficients and separation factors were evaluated over the immiscibility region.
Abstract: Experimental liquid-liquid equilibria of water+acetic acid+dimethyl phthalate and water+acetic acid+diethyl phthalate systems were investigated at 293.16±0.20 K. The reliability of experimental tie-line data was ascertained through an Othmer-Tobias plot. Distribution coefficients and separation factors were evaluated over the immiscibility region. It is concluded that the high-boiling solvents dimethyl phthalate and diethyl phthalate are suitable separating agents for dilute aqueous acetic acid solutions
TL;DR: In this paper, the solubilities of 2,6-dimethylnaphthalene and 2,7-dimethylamine were measured by a flow-type apparatus.
Abstract: Separation methods for coal liquefaction products have received considerable attention recently for use as the raw materials of fine chemicals. The solubilities of 2,6-dimethylnaphthalene and 2,7-dimethylnaphthalene at 308.2 and 328.2 K and the solubilities of the binary mixture at 308.2 and 318.2 K in supercritical carbon dioxide were measured by a flow-type apparatus. The pressure range of measurement was about 8--25 MPa. The solubilities were correlated by a three-constant cubic equation of state with two characteristic parameters.
TL;DR: In this paper, the Taylor-Aris dispersion technique was used to determine the supercritical fluid phase linear velocity dependence in all systems, and the tendency of the dependence of the diffusivity on the molecular size and shape was quantitatively discussed.
Abstract: Binary diffusion coefficients of benzene, toluene, ethylbenzene, n-propylbenzene, isopropylbenzene, o-xylene, m-xylene, p-xylene, cumene, and mesitylene in CO 2 as a supercritical solvent were determined using the Taylor-Aris dispersion technique. The supercritical fluid phase linear velocity dependence was confirmed in all systems, and the tendency of the dependence of the diffusivity on the molecular size and shape is quantitatively discussed. The influence of pressure and temperature for benzene was extensively studied
TL;DR: In this article, the NRTL and UNIQUAC equations have been fitted to the experimental data by optimizing their system-specific parameters; the goodness of fit is satisfactory in both cases.
Abstract: Liquid-liquid equilibrium data are reported for the binary system water + methyl isobutyl ketone over the range 20–55 °C and for the ternary system water + propanoic acid + methyl isobutyl ketone at 25, 35, 45, and 55 °C. The NRTL and UNIQUAC equations have been fitted to the experimental data by optimizing their system-specific parameters; the goodness of fit is satisfactory in both cases. © 1993, American Chemical Society. All rights reserved.
TL;DR: In this article, entrainers can be used to tailor supercritical fluid solvents for specific applications, such as carbon dioxide supercritical extraction, which is a novel separation technique of great versatility.
Abstract: Although supercritical extraction has been widely publicized as a novel separation technique of great versatility, it now appears that its applications will be in a number of specialized situations, each characterized by a rather specific set of requirements To develop such applications, one requires a rather thorough understanding of the chemistry and physics of the supercritical fluid state at the molecular level New experimental data are presented for the solubility of several solid solutes and solute mixtures in entrainer-doped supercritical fluid carbon dioxide These results, along with others from the literature, are used to demonstrate the effects of solute size (appreciable) and solute polarity (small) in pure supercritical fluids Solvent effects appear to be far more important than solute structure, and polar and hydrogen-bonding entrainers exhibit large effects on both solute loading and selectivity Thus, it appears that entrainers can be used to tailor supercritical fluid solvents for specific applications
TL;DR: The measured solubilities and saturated liquid densities were correlated with an equation of state as discussed by the authors, which was correlated with the solubility and saturated densities of carbon dioxide.
Abstract: Solubilities and saturated densities of carbon dioxide in pentadecane, hexadecane, and an equimolar mixture of pentadecane+hexadecane were measured at 313.15 K without analysis of the phase compositions. The measured solubilities and saturated liquid densities were correlated with an equation of state
TL;DR: In this paper, the excess molar volumes (V E ) for binary mixtures containing cyclic ethers and 1-alkanols were measured at atmospheric pressure and 298.15 K by using a vibrating-tube densimeter.
Abstract: Excess molar volumes (V E ) for binary mixtures containing cyclic ethers and 1-alkanols (C 6 -C 9 ) have been measured at atmospheric pressure and 298.15 K by using a vibrating-tube densimeter. The experimental data were correlated by means of a polynomial function. The results are discussed in terms of molecular interactions between the components and the ring size of the ethers
TL;DR: In this article, experimental data for propane hydrate formation in pure water and aqueous single, binary, and ternary solutions of NaCl, KCl, and CaCl[sub 2] were obtained.
Abstract: Incipient equilibrium experimental data for propane hydrate formation in pure water and aqueous single, binary, and ternary solutions of NaCl, KCl, and CaCl[sub 2] were obtained. Forty experiments were performed in the temperature range of 261.9-278.3 K using a new apparatus which was constructed in the authors' laboratory. The apparatus was found to provide measurements which are reproducible and consistent with values reported in the literature. The results were compared with the predictions from a hydrate equilibrium calculation method. The agreement between the data and the predictions was found to be good.
TL;DR: In this paper, the authors measured the Henry's law constants of 15 volatile organic compounds in dilute aqueous solutions by the procedure of equilibrium partitioning in a closed system, based upon the measurement of the headspace concentration by gas chromatography.
Abstract: Accurate knowledge of Henry's law constants, H, or air/water partitioning coefficients are required to predict the behavior of organic compounds in the environment. In particular, when the compounds are relatively volatile and exhibit low solubility in water, air stripping may be a viable method for above-ground treatment. Henry's law constants of 15 volatile organic compounds in dilute aqueous solutions were measured by the procedure of equilibrium partitioning in a closed system. The method is based upon the measurement of the headspace concentration by gas chromatography. The compounds investigated included six halogenated hydrocarbons, four aromatic hydrocarbons, and five alkanes. The measurements were made at three temperatures between 25 and 45 C. The measured Henry's law constants compared well with the literature data of some liquids. The temperature dependence of Henry's law constant was also studied from the van't Hoff relation.
TL;DR: The densities, refractive indices, and excess molar volumes of the ternary systems water + methanol + 1-octanol and water + ethanol + 1 octanol have been determined at 298.15 K as discussed by the authors.
Abstract: The densities, refractive indices, and excess molar volumes of the ternary systems water + methanol + 1-octanol and water + ethanol + 1-octanol have been determined at 298.15 K. The excess volumes have been correlated using Redlich-Kister functions. © 1993, American Chemical Society. All rights reserved.
TL;DR: In this paper, the solubilities of stearic acid, stearyl alcohol, and arachidyl alcohol in supercritical carbon dioxide were measured by using a flow-type apparatus at 35 C up to 23.7 MPa.
Abstract: The solubilities of stearic acid (octadecanoic acid), stearyl alcohol (1-octadecanol), and arachidyl alcohol (1-eicosanol) in supercritical carbon dioxide were measured by using a flow-type apparatus at 35 C up to 23.7 MPa. The solubilities of those substances and other fatty acids and higher alcohols in supercritical carbon dioxide at 35 C were correlated by a solution model based on the regular solution model coupled with the Flory-Huggins theory.
TL;DR: In this article, the solubilities of mixtures of hydrogen sulfide and carbon dioxide in a 35 wt% (3.04 kmol/m[sup 3]) aqueous solution of N-methyldiethanolamine at 40 and 100C have been measured.
Abstract: Aqueous solutions of alkanolamines are commonly used to strip acid gases (H[sub 2]S and CO[sub 2]) from streams contaminated with these components. The two most widely used amines are monoethanolamine (MEA) and diethanolamine (DEA). The solubilities of mixtures of hydrogen sulfide and carbon dioxide in a 35 wt% (3.04 kmol/m[sup 3]) aqueous solution of N-methyldiethanolamine at 40 and 100C have been measured. Partial pressures of the acid gases ranged from 0.006 to 101 kPa at 40C and from 4 to 530 kPa at 100C.
TL;DR: In this article, the authors measured mutual binary solubilities for 29 aldehydes ranging from C 3 to C 12, and found that the solubility of aldehyde in water decreased very rapidly with increases in molecular weight.
Abstract: Mutual binary solubilities were measured for 29 aldehydes ranging from C 3 to C 12 . Of this total, 7 were unsaturated aldehydes such as acrolein and crotonaldehyde, 5 were cyclic aldehydes such as benzaldehyde and 2-furaldehyde, and the remaining 17 were alkanecarbaldehydes. The solubility of aldehyde in water decreased very rapidly with increases in molecular weight; the solubility of water in aldehyde decreased less rapidly with molecular weight. No major differences were noted between the solubilities of unsaturated aldehydes such as acrolein and saturated aldehydes such as propionaldehyde. In some cases, the solubility increased with increases in temperature; in others, the solubility decreased with increases in temperature
TL;DR: In this paper, the authors measured the mutual binary solubilities in water for aliphatic amines up to C 12, and found that all amines are miscible with water in all proportions up to the boiling point of the amine.
Abstract: Mutual binary solubilities in water have been experimentally measured for aliphatic amines up to C 12 . Data are given for 51 water-organic pairs at temperatures of 0-90 o C. It was found that 19 binary systems are miscible in all proportions, 19 are only partially miscible over the entire temperature range, and 13 are partially miscible at higher temperatures but have lower critical solution temperatures and are completely miscible at lower temperatures. The characteristic feature of the solubility is the strong dependence on molecular weight. All amines up to C 4 are miscible with water in all proportions up to the boiling point of the amine
TL;DR: In this paper, the experimental results were successfully correlated with the Peng-Robinson equation of state, and used to predict the vapor-liquid equilibrium (VLE) values for the binary system.
Abstract: Vapor-liquid equilibrium (VLE) values are required in technological applications and are fundamental to separation operations. In this work the authors report VLE data on the three binary mixtures and the ternary system of nitrogen, argon, and methane at 122.89 K. The experimental VLE values on the binary mixtures were correlated with the Peng-Robinson equation of state, and used to predict the VLE values for the binary system. The predicted values were than compared with the experimental results. Calculated pressure and vapor composition from the equation are compared with the ternary mixture data. The experimental results are successfully correlated with the Peng-Robinson equation of state.
TL;DR: In this article, the authors presented the solubility data for methane in four normal paraffins at temperatures from 323 to 423 K and pressures up to 107 MPa, and the results were in good agreement with the earlier measurements of Chao and co-workers.
Abstract: Solubility data are presented for methane in four heavy normal paraffins at temperatures from 323 to 423 K and pressures up to 107 MPa The paraffins studied are eicosane (n-C[sub 20]), octacosane(n-C[sub 28]), hexatriacontane (n-C[sub 36]), and tetratetracontane (n-C[sub 44]) The data obtained for the solubility of methane in n-C[sub 20], n-C[sub 28], and n-C[sub 36] are in good agreement with the earlier measurements of Chao and co-workers The new data can be described with RMS errors of about 0001 in mole fraction by the Soave-Redlich-Kwong (SRK) or Peng-Robinson (PR) equation of state when two interaction parameters per isotherm are used Henry's constants and partial molar volumes at infinite dilution for methane have also been evaluated from the data