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Mingde Yang - One of the best experts on this subject based on the ideXlab platform.
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determination of Saturated Vapour Pressure of aniline hydrochloride and Vapour liquid equilibrium of the water aniline hydrochloride system
Fluid Phase Equilibria, 2016Co-Authors: Husheng Hu, Yulong Wu, Mingde YangAbstract:Abstract The Vapour–liquid equilibrium (VLE) data for water (A)-aniline hydrochloride (B) binary system is the basis for the design of distillation columns for recovery of aniline hydrochloride from condensate aqueous solution produced during the dehydration of bischofite by aniline hydrochloride composite salt method or from the wastewater containing aniline hydrochloride. In this study, a new dynamic condensate-circulation still was designed and used for the determination of Saturated Vapour Pressure of pure aniline hydrochloride and VLE and Vapour–liquid–solid equilibrium (VLSE) data for water (A)-aniline hydrochloride (B) binary system at 101.3 kPa. The phase diagrams of equilibrated Vapour-phase composition versus overall liquid-phase composition yB-xB (where subscript B denotes aniline hydrochloride) and equilibrated temperature versus overall liquid-phase or Vapour-phase composition T-xB(yB) were plotted by using the VLE and VLSE data and the data on solubility. The VLE data for this system were correlated with a binary non-electrolyte NRTL and an electrolyte-NRTL activity coefficient model respectively, and the results indicated that the use of electrolyte-NRTL gave satisfactory results (the root mean square deviations (RMSD) between predicted and measured are RMSD(ΔT) = 2.5 K, RMSD(ΔyB) = 0.0021).
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Determination of Saturated Vapour Pressure of aniline hydrochloride and Vapour–liquid equilibrium of the water- aniline hydrochloride system
Fluid Phase Equilibria, 2016Co-Authors: Husheng Hu, Yulong Wu, Mingde YangAbstract:Abstract The Vapour–liquid equilibrium (VLE) data for water (A)-aniline hydrochloride (B) binary system is the basis for the design of distillation columns for recovery of aniline hydrochloride from condensate aqueous solution produced during the dehydration of bischofite by aniline hydrochloride composite salt method or from the wastewater containing aniline hydrochloride. In this study, a new dynamic condensate-circulation still was designed and used for the determination of Saturated Vapour Pressure of pure aniline hydrochloride and VLE and Vapour–liquid–solid equilibrium (VLSE) data for water (A)-aniline hydrochloride (B) binary system at 101.3 kPa. The phase diagrams of equilibrated Vapour-phase composition versus overall liquid-phase composition yB-xB (where subscript B denotes aniline hydrochloride) and equilibrated temperature versus overall liquid-phase or Vapour-phase composition T-xB(yB) were plotted by using the VLE and VLSE data and the data on solubility. The VLE data for this system were correlated with a binary non-electrolyte NRTL and an electrolyte-NRTL activity coefficient model respectively, and the results indicated that the use of electrolyte-NRTL gave satisfactory results (the root mean square deviations (RMSD) between predicted and measured are RMSD(ΔT) = 2.5 K, RMSD(ΔyB) = 0.0021).
Husheng Hu - One of the best experts on this subject based on the ideXlab platform.
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determination of Saturated Vapour Pressure of aniline hydrochloride and Vapour liquid equilibrium of the water aniline hydrochloride system
Fluid Phase Equilibria, 2016Co-Authors: Husheng Hu, Yulong Wu, Mingde YangAbstract:Abstract The Vapour–liquid equilibrium (VLE) data for water (A)-aniline hydrochloride (B) binary system is the basis for the design of distillation columns for recovery of aniline hydrochloride from condensate aqueous solution produced during the dehydration of bischofite by aniline hydrochloride composite salt method or from the wastewater containing aniline hydrochloride. In this study, a new dynamic condensate-circulation still was designed and used for the determination of Saturated Vapour Pressure of pure aniline hydrochloride and VLE and Vapour–liquid–solid equilibrium (VLSE) data for water (A)-aniline hydrochloride (B) binary system at 101.3 kPa. The phase diagrams of equilibrated Vapour-phase composition versus overall liquid-phase composition yB-xB (where subscript B denotes aniline hydrochloride) and equilibrated temperature versus overall liquid-phase or Vapour-phase composition T-xB(yB) were plotted by using the VLE and VLSE data and the data on solubility. The VLE data for this system were correlated with a binary non-electrolyte NRTL and an electrolyte-NRTL activity coefficient model respectively, and the results indicated that the use of electrolyte-NRTL gave satisfactory results (the root mean square deviations (RMSD) between predicted and measured are RMSD(ΔT) = 2.5 K, RMSD(ΔyB) = 0.0021).
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Determination of Saturated Vapour Pressure of aniline hydrochloride and Vapour–liquid equilibrium of the water- aniline hydrochloride system
Fluid Phase Equilibria, 2016Co-Authors: Husheng Hu, Yulong Wu, Mingde YangAbstract:Abstract The Vapour–liquid equilibrium (VLE) data for water (A)-aniline hydrochloride (B) binary system is the basis for the design of distillation columns for recovery of aniline hydrochloride from condensate aqueous solution produced during the dehydration of bischofite by aniline hydrochloride composite salt method or from the wastewater containing aniline hydrochloride. In this study, a new dynamic condensate-circulation still was designed and used for the determination of Saturated Vapour Pressure of pure aniline hydrochloride and VLE and Vapour–liquid–solid equilibrium (VLSE) data for water (A)-aniline hydrochloride (B) binary system at 101.3 kPa. The phase diagrams of equilibrated Vapour-phase composition versus overall liquid-phase composition yB-xB (where subscript B denotes aniline hydrochloride) and equilibrated temperature versus overall liquid-phase or Vapour-phase composition T-xB(yB) were plotted by using the VLE and VLSE data and the data on solubility. The VLE data for this system were correlated with a binary non-electrolyte NRTL and an electrolyte-NRTL activity coefficient model respectively, and the results indicated that the use of electrolyte-NRTL gave satisfactory results (the root mean square deviations (RMSD) between predicted and measured are RMSD(ΔT) = 2.5 K, RMSD(ΔyB) = 0.0021).
Yulong Wu - One of the best experts on this subject based on the ideXlab platform.
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determination of Saturated Vapour Pressure of aniline hydrochloride and Vapour liquid equilibrium of the water aniline hydrochloride system
Fluid Phase Equilibria, 2016Co-Authors: Husheng Hu, Yulong Wu, Mingde YangAbstract:Abstract The Vapour–liquid equilibrium (VLE) data for water (A)-aniline hydrochloride (B) binary system is the basis for the design of distillation columns for recovery of aniline hydrochloride from condensate aqueous solution produced during the dehydration of bischofite by aniline hydrochloride composite salt method or from the wastewater containing aniline hydrochloride. In this study, a new dynamic condensate-circulation still was designed and used for the determination of Saturated Vapour Pressure of pure aniline hydrochloride and VLE and Vapour–liquid–solid equilibrium (VLSE) data for water (A)-aniline hydrochloride (B) binary system at 101.3 kPa. The phase diagrams of equilibrated Vapour-phase composition versus overall liquid-phase composition yB-xB (where subscript B denotes aniline hydrochloride) and equilibrated temperature versus overall liquid-phase or Vapour-phase composition T-xB(yB) were plotted by using the VLE and VLSE data and the data on solubility. The VLE data for this system were correlated with a binary non-electrolyte NRTL and an electrolyte-NRTL activity coefficient model respectively, and the results indicated that the use of electrolyte-NRTL gave satisfactory results (the root mean square deviations (RMSD) between predicted and measured are RMSD(ΔT) = 2.5 K, RMSD(ΔyB) = 0.0021).
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Determination of Saturated Vapour Pressure of aniline hydrochloride and Vapour–liquid equilibrium of the water- aniline hydrochloride system
Fluid Phase Equilibria, 2016Co-Authors: Husheng Hu, Yulong Wu, Mingde YangAbstract:Abstract The Vapour–liquid equilibrium (VLE) data for water (A)-aniline hydrochloride (B) binary system is the basis for the design of distillation columns for recovery of aniline hydrochloride from condensate aqueous solution produced during the dehydration of bischofite by aniline hydrochloride composite salt method or from the wastewater containing aniline hydrochloride. In this study, a new dynamic condensate-circulation still was designed and used for the determination of Saturated Vapour Pressure of pure aniline hydrochloride and VLE and Vapour–liquid–solid equilibrium (VLSE) data for water (A)-aniline hydrochloride (B) binary system at 101.3 kPa. The phase diagrams of equilibrated Vapour-phase composition versus overall liquid-phase composition yB-xB (where subscript B denotes aniline hydrochloride) and equilibrated temperature versus overall liquid-phase or Vapour-phase composition T-xB(yB) were plotted by using the VLE and VLSE data and the data on solubility. The VLE data for this system were correlated with a binary non-electrolyte NRTL and an electrolyte-NRTL activity coefficient model respectively, and the results indicated that the use of electrolyte-NRTL gave satisfactory results (the root mean square deviations (RMSD) between predicted and measured are RMSD(ΔT) = 2.5 K, RMSD(ΔyB) = 0.0021).
Andrée Voilley - One of the best experts on this subject based on the ideXlab platform.
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Saturated Vapour Pressure of aroma compounds at various temperatures
Food Chemistry, 2004Co-Authors: Marco Covarrubiascervantes, Dominique Champion, Ilham Mokbel, Jacques Jose, Andrée VoilleyAbstract:Abstract The aim of this study was to determine experimentally the Vapour Pressures of aroma compounds at various temperatures, especially at negative ones. The aroma compounds were: acetone, 2-butanone, 2-hexanone, 2-octanone, ethyl acetate, ethyl butanoate, ethyl hexanoate, n-hexanal, n-hexanol and γ-hexalactone. The technique used was a static device where Vapour Pressure was measured at equilibrium. The temperatures of analysis varied from −40 to 25 °C. Volatility of a pure compound depends on characteristics such as length of the aliphatic chain, the functional group and temperature. Among an homologous series, volatility increases when the aliphatic chain decreases and when temperature increases. For aroma compounds which have the same number of carbon atoms in their structure, volatility depends not only on either temperature or molecular weight, but also on the functional group of the molecule. At a given temperature volatility of compounds which have the same number of carbon atoms in their structure, decreases as follows: ester> ketone> aldehyde> alcohol> lactone.
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experimental and estimated Saturated Vapour Pressures of aroma compounds
Fluid Phase Equilibria, 1999Co-Authors: M Espinosa A Diaz, T Guetachew, Pascale Landy, Jacques Jose, Andrée VoilleyAbstract:Abstract The Saturated Vapour Pressure of d-linalool, 2-nonanone, d-limonene and isoamyl acetate were measured using a static method at different temperatures from 223 to 468 K. From the experimental values, Antoine's constants were determined to enable the calculations of the Saturated Vapour Pressures at a given temperature. The Saturated Vapour Pressure of the four aroma compounds at 298 K were respectively 27, 59, 200 and 733 Pa. These results were compared with those obtained using different estimation methods (Antoine–Grain, Watson, Lee–Kesler, Gomez–Thodos, Grain and Mackay). Gomez–Thodos' model was found to be the most accurate method for the estimation of the Saturated Vapour Pressure of these aroma compounds. The importance of accurate Saturated Vapour Pressures for the calculation of other thermodynamic properties used in the study of Vapour–liquid equilibria of aroma compounds is discussed.
Fadi Eskandar - One of the best experts on this subject based on the ideXlab platform.
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factors affecting aerosol performance during nebulization with jet and ultrasonic nebulizers
European Journal of Pharmaceutical Sciences, 2003Co-Authors: Hartwig Steckel, Fadi EskandarAbstract:Nebulization of aqueous solutions is a convenient delivery system to deliver drugs to the lungs because it can produce droplets small enough to reach the alveolar region. However, the droplet size might be affected by the changes in the temperature and the concentration of the nebulizing solution in the reservoir during nebulization. In this study, the changes in the droplet size over the nebulization time using a PariBoy® air-jet and a Multisonic® ultrasonic nebulizer have been studied. The findings were related to changes in the temperature, concentration, surface tension, viscosity and Saturated Vapour Pressure of the nebulizing solution. By using the jet nebulizer, an increase in the droplet size followed by a decrease has been observed. This observation could be attributed to the approx. 7 °C reduction of the temperature during the first 2 min in the jet nebulizer reservoir which increased the viscosity of the nebulizing solution. After this initial period of time, the increasing drug concentration induced a reduction of the surface tension and, consequently, a decrease in the droplet size. However, with the ultrasonic nebulizer a temperature increase of approx. 20 °C during the first 6 min in the nebulizing solution was observed leading to a decrease in droplet size, viscosity and surface tension and an increasing Saturated Vapour Pressure. This again led to smaller average droplet sizes.
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Factors affecting aerosol performance during nebulization with jet and ultrasonic nebulizers.
European Journal of Pharmaceutical Sciences, 2003Co-Authors: Hartwig Steckel, Fadi EskandarAbstract:Nebulization of aqueous solutions is a convenient delivery system to deliver drugs to the lungs because it can produce droplets small enough to reach the alveolar region. However, the droplet size might be affected by the changes in the temperature and the concentration of the nebulizing solution in the reservoir during nebulization. In this study, the changes in the droplet size over the nebulization time using a PariBoy air-jet and a Multisonic ultrasonic nebulizer have been studied. The findings were related to changes in the temperature, concentration, surface tension, viscosity and Saturated Vapour Pressure of the nebulizing solution. By using the jet nebulizer, an increase in the droplet size followed by a decrease has been observed. This observation could be attributed to the approx. 7 degrees C reduction of the temperature during the first 2 min in the jet nebulizer reservoir which increased the viscosity of the nebulizing solution. After this initial period of time, the increasing drug concentration induced a reduction of the surface tension and, consequently, a decrease in the droplet size. However, with the ultrasonic nebulizer a temperature increase of approx. 20 degrees C during the first 6 min in the nebulizing solution was observed leading to a decrease in droplet size, viscosity and surface tension and an increasing Saturated Vapour Pressure. This again led to smaller average droplet sizes.
