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2 Diethylaminoethanol

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Lemeng Wang – One of the best experts on this subject based on the ideXlab platform.

Isabel M. S. Lampreia – One of the best experts on this subject based on the ideXlab platform.

  • Ultrasound Speeds and Molar Isentropic Compressions of Aqueous 2-(Ethylamino)ethanol Mixtures from 283.15 to 303.15 K
    Journal of Solution Chemistry, 2010
    Co-Authors: Isabel M. S. Lampreia, Ângela F. S. Santos
    Abstract:

    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 + 2Diethylaminoethanol (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.

  • Ultrasound Speeds and Molar Isentropic Compressions of Aqueous 2-(Ethylamino)ethanol Mixtures from 283.15 to 303.15 K
    Journal of Solution Chemistry, 2010
    Co-Authors: Isabel M. S. Lampreia, Ângela F. S. Santos
    Abstract:

    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 + 2Diethylaminoethanol (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.

  • Ultrasound Speeds and Molar Isentropic Compressions of Aqueous Binary Mixtures of Diethylamine from 278.15 to 308.15 K
    Journal of Solution Chemistry, 2007
    Co-Authors: Angela F. S. S. Mendonça, Florbela A. Dias, Isabel M. S. Lampreia
    Abstract:

    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 + 2Diethylaminoethanol (DEEA), are also analyzed and interpreted in terms of changes in the solute configuration, the degree of hydrolysis and solute-solvent interactions.

Pan Zhang – One of the best experts on this subject based on the ideXlab platform.

  • Effect of partial pressure on CO2 absorption performance in piperazine promoted 2Diethylaminoethanol and 1-dimethylamino-2-propanol aqueous solutions
    The Journal of Chemical Thermodynamics, 2020
    Co-Authors: Pan Zhang, Yanjie Zhang, Lemeng Wang
    Abstract:

    Abstract Piperazine (PZ) was used to enhance the absorption of CO2 in 2Diethylaminoethanol (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.

  • 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, 2019
    Co-Authors: Pan Zhang, Lemeng Wang
    Abstract:

    Abstract The surface tensions of 2Diethylaminoethanol (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.

  • Experiment and model for surface tensions of 2Diethylaminoethanol‑N‑(2‑aminoethyl)ethanolamine, 2Diethylaminoethanol‑N‑methyl‑1,3‑propane‑diamine and 2Diethylaminoethanol‑1,4‑butanediamine aqueous solutions
    Journal of Molecular Liquids, 2019
    Co-Authors: Pan Zhang, Lemeng Wang
    Abstract:

    Abstract The surface tensions of 2Diethylaminoethanol (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.

Angela F. S. S. Mendonça – One of the best experts on this subject based on the ideXlab platform.

  • Ultrasound Speeds and Molar Isentropic Compressions of Aqueous Binary Mixtures of Diethylamine from 278.15 to 308.15 K
    Journal of Solution Chemistry, 2007
    Co-Authors: Angela F. S. S. Mendonça, Florbela A. Dias, Isabel M. S. Lampreia
    Abstract:

    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 + 2Diethylaminoethanol (DEEA), are also analyzed and interpreted in terms of changes in the solute configuration, the degree of hydrolysis and solute-solvent interactions.

  • 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, 2006
    Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. Reis
    Abstract:

    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 2Diethylaminoethanol 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.

  • New tools for the analysis of refractive index measurements in liquid mixtures. Application to 2Diethylaminoethanol + water mixtures from 283.15 to 303.15 K
    New Journal of Chemistry, 2006
    Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. Reis
    Abstract:

    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 2Diethylaminoethanol 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.

João Carlos R. Reis – One of the best experts on this subject based on the ideXlab platform.

  • 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, 2006
    Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. Reis
    Abstract:

    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 2Diethylaminoethanol 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.

  • New tools for the analysis of refractive index measurements in liquid mixtures. Application to 2Diethylaminoethanol + water mixtures from 283.15 to 303.15 K
    New Journal of Chemistry, 2006
    Co-Authors: Isabel M. S. Lampreia, Angela F. S. S. Mendonça, Sara M. A. Dias, João Carlos R. Reis
    Abstract:

    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 2Diethylaminoethanol 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.