The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform
Lemeng Wang - One of the best experts on this subject based on the ideXlab platform.
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Effect of partial pressure on CO2 absorption performance in piperazine promoted 2-Diethylaminoethanol and 1-dimethylamino-2-propanol aqueous solutions
The Journal of Chemical Thermodynamics, 2020Co-Authors: Pan Zhang, Yanjie Zhang, Lemeng WangAbstract:Abstract Piperazine (PZ) was used to enhance the absorption of CO2 in 2-Diethylaminoethanol (DEAE) and 1-dimethylamino-2-propanol (DMA2P) aqueous solutions. The mole fraction of CO2 in N2-balanced gas mixtures ranged from 0.1 to 0.8. The mass fractions of amine and PZ ranged from 0.300 to 0.500 and from 0.050 to 0.075, respectively. The experiments were performed at 313.2 K. The absorption capacity and absorption rate under a series of conditions were illustrated, and the effect of CO2 partial pressure on the absorption performance was demonstrated. At a given CO2 partial pressure, the CO2 absorbed by the PZ promoted DEAE and DMA2P aqueous solutions increases with the mass fraction of the mixed aqueous solutions, and it increases with the CO2 partial pressure at a given mass fraction. The absorption capacity of the DMA2P-PZ aqueous solution is slightly higher than that of the DEAE-PZ aqueous solution. In addition, the absorption rate depends on the competitive effects of the mass fractions, solution viscosity and the partial pressure of CO2.
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experiment and model for surface tensions of 2 Diethylaminoethanol n 2 aminoethyl ethanolamine 2 Diethylaminoethanol n methyl 1 3 propane diamine and 2 Diethylaminoethanol 1 4 butanediamine aqueous solutions
Journal of Molecular Liquids, 2019Co-Authors: Pan Zhang, Lemeng WangAbstract:Abstract The surface tensions of 2‑Diethylaminoethanol (DEAE)‑N‑(2‑aminoethyl)ethanolamine (AEEA), DEAE‑N‑methyl‑1,3‑propane‑diamine (MAPA) and DEAE‑1,4‑butanediamine (BDA) aqueous solutions have been measured by using the BZY-1 surface tension meter. The mass fractions of DEAE and AEEA/MAPA/BDA respectively ranged from 0.300 to 0.500 and 0.050 to 0.150. The temperature ranged from 303.2 K to 323.2 K. A thermodynamic equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The effects of temperature and mass fraction of amines on the surface tension were demonstrated on the basis of experiments and calculations. The surface thermodynamics including surface enthalpy and surface entropy of blended amine aqueous solutions were also determined, and their temperature and mass fraction dependences were analyzed.
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Experiment and model for surface tensions of 2‑Diethylaminoethanol‑N‑(2‑aminoethyl)ethanolamine, 2‑Diethylaminoethanol‑N‑methyl‑1,3‑propane‑diamine and 2‑Diethylaminoethanol‑1,4‑butanediamine aqueous solutions
Journal of Molecular Liquids, 2019Co-Authors: Pan Zhang, Lemeng WangAbstract:Abstract The surface tensions of 2‑Diethylaminoethanol (DEAE)‑N‑(2‑aminoethyl)ethanolamine (AEEA), DEAE‑N‑methyl‑1,3‑propane‑diamine (MAPA) and DEAE‑1,4‑butanediamine (BDA) aqueous solutions have been measured by using the BZY-1 surface tension meter. The mass fractions of DEAE and AEEA/MAPA/BDA respectively ranged from 0.300 to 0.500 and 0.050 to 0.150. The temperature ranged from 303.2 K to 323.2 K. A thermodynamic equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The effects of temperature and mass fraction of amines on the surface tension were demonstrated on the basis of experiments and calculations. The surface thermodynamics including surface enthalpy and surface entropy of blended amine aqueous solutions were also determined, and their temperature and mass fraction dependences were analyzed.
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Experiments and model for the surface tension of DEAE-PZ and DEAE-MEA aqueous solutions
The Journal of Chemical Thermodynamics, 2017Co-Authors: Lemeng Wang, Xiangfeng TianAbstract:Abstract The surface tension (γ) of 2-Diethylaminoethanol (DEAE), DEAE-monoethanolamine (MEA), and DEAE-piperazine (PZ) aqueous solutions was measured by using the BZY-1 surface tension meter. The temperature ranged from 303.2 K to 323.2 K. The mass fraction of DEAE, MEA and PZ respectively ranged from 0.30 to 0.50, 0.05 to 0.15 and 0.025 to 0.075. An equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The effects of temperature and mass fraction of amines on the surface tension were demonstrated on the basis of experiments and calculations.
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absorption capacity and viscosity for co 2 capture process using high concentrated pz deae aqueous solution
The Journal of Chemical Thermodynamics, 2016Co-Authors: Lemeng Wang, Pan ZhangAbstract:Abstract The absorption capacity of CO2 in piperazine (PZ) promoted 2-Diethylaminoethanol (DEAE) aqueous solution was measured. The viscosities of both CO2-unloaded and CO2-loaded PZ-DEAE aqueous solutions were measured and then modelled. The temperatures ranged from 303.2 K to 323.2 K. The mass fraction of PZ and DEAE respectively ranged from 0 to 0.075 and 0.3 to 0.5. The temperature and concentration dependences of absorption capacity were determined. The effects of temperature, mass fraction and CO2 loading on viscosities are demonstrated.
Isabel M. S. Lampreia - One of the best experts on this subject based on the ideXlab platform.
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Ultrasound Speeds and Molar Isentropic Compressions of Aqueous 2-(Ethylamino)ethanol Mixtures from 283.15 to 303.15 K
Journal of Solution Chemistry, 2010Co-Authors: Isabel M. S. Lampreia, Ângela F. S. SantosAbstract:Ultrasound speeds in 31 aqueous binary mixtures of 2-(ethylamino)ethanol (EEA) were experimentally determined over the entire composition range at 283.15, 288.15 and 303.15 K. Isentropic compressibilities, κS, were calculated by combining the ultrasound speed with density data. Excess molar isentropic compressions, \(K_{S,\mathrm{m}}^{\mathrm{E}}\), referred to a thermodynamically-defined ideal liquid mixture, were estimated. Excess partial molar isentropic compressions, \(K_{S,i}^{\mathrm{E}}\), of both components and their respective limits at infinite dilution, \(K_{S,i}^{\mathrm{E,}\infty}\), were analytically obtained using Redlich-Kister type equations. The temperature and composition dependences of \(K_{S,i}^{\mathrm{E}}\) were analyzed, especially in the water and EEA rich regions. The present \(K_{S,i}^{\mathrm{E,}\infty}\) values are compared with those for water + 2-Diethylaminoethanol (DEEA) and water + diethylamine (DEA) mixtures, as a function of temperature. Although the \(K_{S,2}^{\mathrm{E,}\infty}\) values for EEA and DEEA increase with temperature, the opposite trend is observed for DEA. Results for aqueous EEA and aqueous DEEA seem to support the idea that the driving force for hydrophobic hydration relies on solute-solvent hydrophilic interaction rather than on enhancing the water structure. On the other hand, different temperature dependent behavior is observed for the differential volumetric properties \(K_{S,i}^{\mathrm{E,}\infty}\) and limiting excess partial molar isobaric expansion, \(E_{P,i}^{\mathrm{E,}\infty}\), which are attributed to the different sensitivity of these properties to hydration.
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Ultrasound Speeds and Molar Isentropic Compressions of Aqueous 2-(Ethylamino)ethanol Mixtures from 283.15 to 303.15 K
Journal of Solution Chemistry, 2010Co-Authors: Isabel M. S. Lampreia, Ângela F. S. SantosAbstract:Ultrasound speeds in 31 aqueous binary mixtures of 2-(ethylamino)ethanol (EEA) were experimentally determined over the entire composition range at 283.15, 288.15 and 303.15 K. Isentropic compressibilities, κ _ S , were calculated by combining the ultrasound speed with density data. Excess molar isentropic compressions, $K_{S,\mathrm{m}}^{\mathrm{E}}$ , referred to a thermodynamically-defined ideal liquid mixture, were estimated. Excess partial molar isentropic compressions, $K_{S,i}^{\mathrm{E}}$ , of both components and their respective limits at infinite dilution, $K_{S,i}^{\mathrm{E,}\infty}$ , were analytically obtained using Redlich-Kister type equations. The temperature and composition dependences of $K_{S,i}^{\mathrm{E}}$ were analyzed, especially in the water and EEA rich regions. The present $K_{S,i}^{\mathrm{E,}\infty}$ values are compared with those for water + 2-Diethylaminoethanol (DEEA) and water + diethylamine (DEA) mixtures, as a function of temperature. Although the $K_{S,2}^{\mathrm{E,}\infty}$ values for EEA and DEEA increase with temperature, the opposite trend is observed for DEA. Results for aqueous EEA and aqueous DEEA seem to support the idea that the driving force for hydrophobic hydration relies on solute-solvent hydrophilic interaction rather than on enhancing the water structure. On the other hand, different temperature dependent behavior is observed for the differential volumetric properties $K_{S,i}^{\mathrm{E,}\infty}$ and limiting excess partial molar isobaric expansion, $E_{P,i}^{\mathrm{E,}\infty}$ , which are attributed to the different sensitivity of these properties to hydration.
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Ultrasound Speeds and Molar Isentropic Compressions of Aqueous Binary Mixtures of Diethylamine from 278.15 to 308.15 K
Journal of Solution Chemistry, 2007Co-Authors: Angela F. S. S. Mendonça, Florbela A. Dias, Isabel M. S. LampreiaAbstract:Ultrasound speeds in aqueous binary mixtures of diethylamine (DEA) were measured across the entire composition range at five temperatures between 278.15 and 308.15 K. Isentropic compressibilities, κ_ S , were calculated from the ultrasound speed and density data. The excess molar isentropic compressions, K _ S ,m ^E, were estimated and their variation with the mole fraction of the amine were fitted by the Redlich–Kister equation. Excess partial molar isentropic compressions, K _ S , i ^E, were then obtained, allowing separation of the role of each component in the mixing process. Interesting insights are gained from the analysis of the temperature and composition dependence of K _ S , i ^E, principally in the water-rich region. A comparison of the limiting values of this property with those of the limiting excess partial molar isobaric expansion, E _ P , i ^E,∞, previously published, clearly shows the different sensitivity of these two differential thermodynamic properties to the mixing process. The different behavior of the temperature dependence of K _ S , i ^E,∞ in the systems, water + DEA, and water + 2-Diethylaminoethanol (DEEA), are also analyzed and interpreted in terms of changes in the solute configuration, the degree of hydrolysis and solute-solvent interactions.
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new tools for the analysis of refractive index measurements in liquid mixtures application to 2 Diethylaminoethanol water mixtures from 283 15 to 303 15 k
New Journal of Chemistry, 2006Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. ReisAbstract:Drawing on methods currently used in chemical thermodynamics, apparent and partial molar refractions of mixing for the components of a liquid mixture are defined. These optical properties are calculated from the experimentally measured refractive index and density of aqueous 2-Diethylaminoethanol mixtures at five different temperatures between 283.15 and 303.15 K and at least at 37 different mole fractions spanning the entire composition range at each temperature. The new optical properties, partial molar refractions of mixing, are discussed in terms of their composition dependence and the effect of temperature on the limiting apparent molar refraction of mixing of the organic component dispersed in water is examined. These profiles are compared with the corresponding profiles obtained for volumetric excess partial molar properties using literature data. This advanced analysis shows that optical properties are able to give new insights into the mixing process.
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New tools for the analysis of refractive index measurements in liquid mixtures. Application to 2-Diethylaminoethanol + water mixtures from 283.15 to 303.15 K
New Journal of Chemistry, 2006Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. ReisAbstract:Drawing on methods currently used in chemical thermodynamics, apparent and partial molar refractions of mixing for the components of a liquid mixture are defined. These optical properties are calculated from the experimentally measured refractive index and density of aqueous 2-Diethylaminoethanol mixtures at five different temperatures between 283.15 and 303.15 K and at least at 37 different mole fractions spanning the entire composition range at each temperature. The new optical properties, partial molar refractions of mixing, are discussed in terms of their composition dependence and the effect of temperature on the limiting apparent molar refraction of mixing of the organic component dispersed in water is examined. These profiles are compared with the corresponding profiles obtained for volumetric excess partial molar properties using literature data. This advanced analysis shows that optical properties are able to give new insights into the mixing process.
Pan Zhang - One of the best experts on this subject based on the ideXlab platform.
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Effect of partial pressure on CO2 absorption performance in piperazine promoted 2-Diethylaminoethanol and 1-dimethylamino-2-propanol aqueous solutions
The Journal of Chemical Thermodynamics, 2020Co-Authors: Pan Zhang, Yanjie Zhang, Lemeng WangAbstract:Abstract Piperazine (PZ) was used to enhance the absorption of CO2 in 2-Diethylaminoethanol (DEAE) and 1-dimethylamino-2-propanol (DMA2P) aqueous solutions. The mole fraction of CO2 in N2-balanced gas mixtures ranged from 0.1 to 0.8. The mass fractions of amine and PZ ranged from 0.300 to 0.500 and from 0.050 to 0.075, respectively. The experiments were performed at 313.2 K. The absorption capacity and absorption rate under a series of conditions were illustrated, and the effect of CO2 partial pressure on the absorption performance was demonstrated. At a given CO2 partial pressure, the CO2 absorbed by the PZ promoted DEAE and DMA2P aqueous solutions increases with the mass fraction of the mixed aqueous solutions, and it increases with the CO2 partial pressure at a given mass fraction. The absorption capacity of the DMA2P-PZ aqueous solution is slightly higher than that of the DEAE-PZ aqueous solution. In addition, the absorption rate depends on the competitive effects of the mass fractions, solution viscosity and the partial pressure of CO2.
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experiment and model for surface tensions of 2 Diethylaminoethanol n 2 aminoethyl ethanolamine 2 Diethylaminoethanol n methyl 1 3 propane diamine and 2 Diethylaminoethanol 1 4 butanediamine aqueous solutions
Journal of Molecular Liquids, 2019Co-Authors: Pan Zhang, Lemeng WangAbstract:Abstract The surface tensions of 2‑Diethylaminoethanol (DEAE)‑N‑(2‑aminoethyl)ethanolamine (AEEA), DEAE‑N‑methyl‑1,3‑propane‑diamine (MAPA) and DEAE‑1,4‑butanediamine (BDA) aqueous solutions have been measured by using the BZY-1 surface tension meter. The mass fractions of DEAE and AEEA/MAPA/BDA respectively ranged from 0.300 to 0.500 and 0.050 to 0.150. The temperature ranged from 303.2 K to 323.2 K. A thermodynamic equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The effects of temperature and mass fraction of amines on the surface tension were demonstrated on the basis of experiments and calculations. The surface thermodynamics including surface enthalpy and surface entropy of blended amine aqueous solutions were also determined, and their temperature and mass fraction dependences were analyzed.
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Experiment and model for surface tensions of 2‑Diethylaminoethanol‑N‑(2‑aminoethyl)ethanolamine, 2‑Diethylaminoethanol‑N‑methyl‑1,3‑propane‑diamine and 2‑Diethylaminoethanol‑1,4‑butanediamine aqueous solutions
Journal of Molecular Liquids, 2019Co-Authors: Pan Zhang, Lemeng WangAbstract:Abstract The surface tensions of 2‑Diethylaminoethanol (DEAE)‑N‑(2‑aminoethyl)ethanolamine (AEEA), DEAE‑N‑methyl‑1,3‑propane‑diamine (MAPA) and DEAE‑1,4‑butanediamine (BDA) aqueous solutions have been measured by using the BZY-1 surface tension meter. The mass fractions of DEAE and AEEA/MAPA/BDA respectively ranged from 0.300 to 0.500 and 0.050 to 0.150. The temperature ranged from 303.2 K to 323.2 K. A thermodynamic equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The effects of temperature and mass fraction of amines on the surface tension were demonstrated on the basis of experiments and calculations. The surface thermodynamics including surface enthalpy and surface entropy of blended amine aqueous solutions were also determined, and their temperature and mass fraction dependences were analyzed.
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absorption capacity and viscosity for co 2 capture process using high concentrated pz deae aqueous solution
The Journal of Chemical Thermodynamics, 2016Co-Authors: Lemeng Wang, Pan ZhangAbstract:Abstract The absorption capacity of CO2 in piperazine (PZ) promoted 2-Diethylaminoethanol (DEAE) aqueous solution was measured. The viscosities of both CO2-unloaded and CO2-loaded PZ-DEAE aqueous solutions were measured and then modelled. The temperatures ranged from 303.2 K to 323.2 K. The mass fraction of PZ and DEAE respectively ranged from 0 to 0.075 and 0.3 to 0.5. The temperature and concentration dependences of absorption capacity were determined. The effects of temperature, mass fraction and CO2 loading on viscosities are demonstrated.
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solubility and viscosity for co2 capture process using mea promoted deae aqueous solution
The Journal of Chemical Thermodynamics, 2016Co-Authors: Lemeng Wang, Pan ZhangAbstract:Abstract The saturated solubility of CO2 in monoethanolamine (MEA) promoted 2-Diethylaminoethanol (DEAE) aqueous solution was investigated at temperatures ranging from (303.2 to 323.2) K. The mass fraction and temperature dependences of the saturated solubility and CO2 loading are illustrated. The viscosities of both CO2-unloaded and CO2-loaded DEAE–MEA aqueous solutions were measured and then calculated by using the Weiland equation. The effects of temperature, mass fraction and CO2 loading on viscosities are demonstrated.
Angela F. S. S. Mendonça - One of the best experts on this subject based on the ideXlab platform.
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Ultrasound Speeds and Molar Isentropic Compressions of Aqueous Binary Mixtures of Diethylamine from 278.15 to 308.15 K
Journal of Solution Chemistry, 2007Co-Authors: Angela F. S. S. Mendonça, Florbela A. Dias, Isabel M. S. LampreiaAbstract:Ultrasound speeds in aqueous binary mixtures of diethylamine (DEA) were measured across the entire composition range at five temperatures between 278.15 and 308.15 K. Isentropic compressibilities, κ_ S , were calculated from the ultrasound speed and density data. The excess molar isentropic compressions, K _ S ,m ^E, were estimated and their variation with the mole fraction of the amine were fitted by the Redlich–Kister equation. Excess partial molar isentropic compressions, K _ S , i ^E, were then obtained, allowing separation of the role of each component in the mixing process. Interesting insights are gained from the analysis of the temperature and composition dependence of K _ S , i ^E, principally in the water-rich region. A comparison of the limiting values of this property with those of the limiting excess partial molar isobaric expansion, E _ P , i ^E,∞, previously published, clearly shows the different sensitivity of these two differential thermodynamic properties to the mixing process. The different behavior of the temperature dependence of K _ S , i ^E,∞ in the systems, water + DEA, and water + 2-Diethylaminoethanol (DEEA), are also analyzed and interpreted in terms of changes in the solute configuration, the degree of hydrolysis and solute-solvent interactions.
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new tools for the analysis of refractive index measurements in liquid mixtures application to 2 Diethylaminoethanol water mixtures from 283 15 to 303 15 k
New Journal of Chemistry, 2006Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. ReisAbstract:Drawing on methods currently used in chemical thermodynamics, apparent and partial molar refractions of mixing for the components of a liquid mixture are defined. These optical properties are calculated from the experimentally measured refractive index and density of aqueous 2-Diethylaminoethanol mixtures at five different temperatures between 283.15 and 303.15 K and at least at 37 different mole fractions spanning the entire composition range at each temperature. The new optical properties, partial molar refractions of mixing, are discussed in terms of their composition dependence and the effect of temperature on the limiting apparent molar refraction of mixing of the organic component dispersed in water is examined. These profiles are compared with the corresponding profiles obtained for volumetric excess partial molar properties using literature data. This advanced analysis shows that optical properties are able to give new insights into the mixing process.
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New tools for the analysis of refractive index measurements in liquid mixtures. Application to 2-Diethylaminoethanol + water mixtures from 283.15 to 303.15 K
New Journal of Chemistry, 2006Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. ReisAbstract:Drawing on methods currently used in chemical thermodynamics, apparent and partial molar refractions of mixing for the components of a liquid mixture are defined. These optical properties are calculated from the experimentally measured refractive index and density of aqueous 2-Diethylaminoethanol mixtures at five different temperatures between 283.15 and 303.15 K and at least at 37 different mole fractions spanning the entire composition range at each temperature. The new optical properties, partial molar refractions of mixing, are discussed in terms of their composition dependence and the effect of temperature on the limiting apparent molar refraction of mixing of the organic component dispersed in water is examined. These profiles are compared with the corresponding profiles obtained for volumetric excess partial molar properties using literature data. This advanced analysis shows that optical properties are able to give new insights into the mixing process.
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Isobaric expansions and isentropic compressions of aqueous binary mixtures of 2-Diethylaminoethanol from 283 to 303 K
Physical Chemistry Chemical Physics, 2003Co-Authors: Isabel M. S. Lampreia, Maria João A. Barbas, Florbela A. Dias, Angela F. S. S. MendonçaAbstract:Densities and ultrasound speeds were determined in aqueous binary mixtures of 2-Diethylaminoethanol over the whole composition range at intervals of 5 K in the temperature range between 283 and 303 K. Thermal expansibility effects on this amphiphile/water mixture are analysed in terms of excess molar isobaric expansions EEP,m for the mixture and of excess apparent molar isobaric expansions EEP,ϕ,i for both chemical substances in the mixture. Different strategies are used and discussed for obtaining limiting (infinite dilution) excess partial molar isobaric expansions. Compressibility effects are described in terms of excess molar isentropic compressions KES,m and excess partial molar isentropic compressions KES,i. The latter properties are analytically calculated from the fit of experimental KES,m data to a Redlich–Kister equation. A method based on this equation yields limiting excess partial molar isentropic compressions. Additionally, excess ultrasound speeds uE are also examined. All these excess properties are referred to a thermodynamically defined ideal liquid mixture. Interesting insights into the mixing process are gained from the visual impact of plots showing the composition and temperature dependence of different excess molar thermodynamic properties. Comparison of expansibility- and compressibility-related quantities shows that these two types of thermodynamic properties probe different aspects of intermolecular and packing effects on the process of mixing amphiphiles and water.
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Volumetric properties of aqueous binary mixtures of 2-Diethylaminoethanol from 283.15 to 303.15 K
Physical Chemistry Chemical Physics, 2000Co-Authors: Maria João A. Barbas, Florbela A. Dias, Angela F. S. S. Mendonça, Isabel M. S. LampreiaAbstract:We report volumetric properties of the binary mixture of 2-Diethylaminoethanol (DEEA) with water. Density values were determined as a function of composition in the temperature range 283.15 to 303.15 K. For the DEEA at 298.15 K (molar volume, 133.2 cm3 mol−1) the measurements have given a limiting partial molar volume of 123.3 cm3 mol−1. To gain some insight into the several aggregation patterns present in the mixtures studied, calculation of excess molar volumes of the mixture, apparent molar volumes of DEEA, as well as excess partial molar volumes of both components were made over the entire composition and temperature ranges. As expected the whole set of results reveals strong deviations from ideality. The excess molar volumes exhibit negative deviations while apparent molar volumes of DEEA and excess partial molar volumes show a complex dependence on composition and temperature.
João Carlos R. Reis - One of the best experts on this subject based on the ideXlab platform.
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new tools for the analysis of refractive index measurements in liquid mixtures application to 2 Diethylaminoethanol water mixtures from 283 15 to 303 15 k
New Journal of Chemistry, 2006Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. ReisAbstract:Drawing on methods currently used in chemical thermodynamics, apparent and partial molar refractions of mixing for the components of a liquid mixture are defined. These optical properties are calculated from the experimentally measured refractive index and density of aqueous 2-Diethylaminoethanol mixtures at five different temperatures between 283.15 and 303.15 K and at least at 37 different mole fractions spanning the entire composition range at each temperature. The new optical properties, partial molar refractions of mixing, are discussed in terms of their composition dependence and the effect of temperature on the limiting apparent molar refraction of mixing of the organic component dispersed in water is examined. These profiles are compared with the corresponding profiles obtained for volumetric excess partial molar properties using literature data. This advanced analysis shows that optical properties are able to give new insights into the mixing process.
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New tools for the analysis of refractive index measurements in liquid mixtures. Application to 2-Diethylaminoethanol + water mixtures from 283.15 to 303.15 K
New Journal of Chemistry, 2006Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. ReisAbstract:Drawing on methods currently used in chemical thermodynamics, apparent and partial molar refractions of mixing for the components of a liquid mixture are defined. These optical properties are calculated from the experimentally measured refractive index and density of aqueous 2-Diethylaminoethanol mixtures at five different temperatures between 283.15 and 303.15 K and at least at 37 different mole fractions spanning the entire composition range at each temperature. The new optical properties, partial molar refractions of mixing, are discussed in terms of their composition dependence and the effect of temperature on the limiting apparent molar refraction of mixing of the organic component dispersed in water is examined. These profiles are compared with the corresponding profiles obtained for volumetric excess partial molar properties using literature data. This advanced analysis shows that optical properties are able to give new insights into the mixing process.
