The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Ming-shan Zhu - One of the best experts on this subject based on the ideXlab platform.
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Vapor Pressure of 1,1,1,2,3,3,3-heptafluoropropane
Fluid Phase Equilibria, 1999Co-Authors: Lin Shi, Ming-shan Zhu, Yuan-yuan Duan, Li-zhong Han, Xia LeiAbstract:Abstract A total of 84 Vapor Pressure data points for 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) have been measured in the temperature range from 243 to 375 K. The maximum total Pressure uncertainty of these data is estimated to be within ±1 kPa. The purity of the sample used in this work is 99.9 mol%. Based on this data set, a Vapor Pressure equation for HFC-227ea has been developed. The root-mean-square (RMS) deviation of the experimental data from the Vapor Pressure equation is 0.057%. The normal boiling point of HFC-227ea was also determined.
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Experimental Vapor Pressure data and a Vapor Pressure equation for trifluoroiodomethane (CF3I)
Fluid Phase Equilibria, 1996Co-Authors: Yuan-yuan Duan, Ming-shan Zhu, Li-zhong HanAbstract:Abstract Sixty four Vapor Pressure data points for trifluoroiodomethane (CF3I) have been measured for the temperature range from 243.15 to 393.15 K. The maximum total Pressure uncertainty of these data is estimated to be within ± 1.0 kPa. The purity of the sample used in this work is 99.95% with 3.4 ppm of water. Based on this data set, a Vapor Pressure equation for CF3I has been developed. This equation contains four coefficients and correlates the measured Vapor Pressures within ± 0.03%.
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New experimental Vapor Pressure data and a new Vapor Pressure equation for HFC134a
Fluid Phase Equilibria, 1992Co-Authors: Ming-shan ZhuAbstract:Abstract The Vapor Pressure of HFC134a has been measured for the temperature range from 279.15K to 363.15K. The measured Vapor Pressure data and data reported by other investigators have been evaluated, and a Vapor Pressure data set with reasonable accuracy has been obtained. Based on this consistent and reliable data set, a Wagner type equation has been determined. This equation contains four coefficients and correlates the measured Vapor Pressures with high accuracy (0.05350%).
Edward F. Crawford - One of the best experts on this subject based on the ideXlab platform.
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Membrane and Vapor Pressure osmometry.
Methods in Enzymology, 2004Co-Authors: E.t. Adams, Edward F. CrawfordAbstract:Publisher Summary Osmotic Pressure, along with freezing point depression (cryoscopy), boiling point elevation (ebulliometry), Vapor Pressure lowering, dew point depression, and elasto-osmometry, is one of the colligative properties of solutions. This chapter is concerned with two of these colligative properties: membrane osmometry and Vapor Pressure osmometry. These techniques are useful for evaluating molecular weights or number average molecular weights and activity coefficients or osmotic Pressure second virial coefficients for nonassociating solutes. For associating solutes, these techniques can be used to establish the type of association present, if that is not known beforehand, as well as nonideal terms. Vapor Pressure osmometry is most useful for studying lower molecular weight solutes: solutes having molecular weights between 0 and 20,000 (grams/mole). Membrane osmometry, on the other hand, is more useful for the study of larger molecular weight solutes: macromolecules having molecular weights between 10,000 and 1,000,000.
Luís Paulo N. Rebelo - One of the best experts on this subject based on the ideXlab platform.
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Vapor Pressure of partially deuterated methanes (CH3D, CH2D2, and CHD3)
The Journal of Chemical Physics, 1997Co-Authors: Jorge C. G. Calado, José N. Canongia Lopes, M. Nunes Da Ponte, Luís Paulo N. RebeloAbstract:The difference between the Vapor Pressure of completely protiated or deuterated methane (CH4 or CD4) and partially deuterated methanes (CH3D, CH2D2, or CHD3) has been measured over the 96–121 K temperature range. The Vapor Pressure data obtained were fitted to equations of the type T ln(p/p)=A/T+B, where the prime always refers to the lighter molecule. Within the studied temperature range, the Vapor Pressure isotope effect was found to be “inverse” (p>p) for all the systems, except in the low-temperature range of the (CH4/CH3D) system. Our data agrees with other results found in the literature, both experimental and theoretical. Differences in the enthalpy of Vaporization were calculated from the experimental results. In the case of the (CH4/CHD3) system, our Vapor Pressure isotope effect (VPIE) results were also compared with liquid–Vapor isotope fractionation factor (LVIFF) data from other authors.
Li-sheng Wang - One of the best experts on this subject based on the ideXlab platform.
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Vapor Pressure of Dimethyl Phosphite and Dimethyl Methylphosphonate
Journal of Chemical & Engineering Data, 2010Co-Authors: Chuan-lei Fan, Li-sheng WangAbstract:The Vapor Pressures of dimethyl phosphite in the range of (352.9 to 443.4) K and dimethyl methylphosphonate in the range of (358.2 to 453.5) K were measured by a static method. The Vapor Pressure data were fitted to the Antoine equation. The Vapor Pressure data of dimethyl phosphate and dimethyl methylphosphonate were compared with literature values. The average relative deviations of Vapor Pressure fitting for dimethyl phosphate and dimethyl methylphosphonate are 0.52 % and 0.68 %, respectively.
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Density, Viscosity, and Vapor Pressure of Phenyl Dichlorophosphite
Journal of Chemical & Engineering Data, 2008Co-Authors: Xian-zhao Shao, Gai-qing Zhang, Li-sheng WangAbstract:The density and viscosity of phenyl dichlorophosphite (C6H5Cl2OP) over a temperature range of (293.27 to 423.25) K were measured. The Vapor Pressure of phenyl dichlorophosphite in the range of (363.25 to 480.79) K was measured by a static method. The density data were fitted to a second-order polynomial, and the viscosity data were fitted to the Andrade equation. The results of Vapor Pressure data were fitted to the Antoine equation. The density data and Vapor Pressure data of phenyl dichlorophosphite were compared with literature values. The absolute average deviations of density, viscosity, and Vapor Pressure fitting for phenyl dichlorophosphite are (0.16, 1.16, and 0.60) %, respectively.
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Density, Viscosity, and Vapor Pressure of Phenylphosphorus Dichloride and Phenylphosphonic Dichloride
Journal of Chemical & Engineering Data, 2004Co-Authors: Li-sheng WangAbstract:The density of phenylphosphonic dichloride (C6H5POCl2) over a temperature range from 293.17 K to 342.85 K and viscosity over a temperature range from 293.21 K to 341.85 K were measured. The Vapor Pressure of phenylphosphorus dichloride (C6H5PCl2) and phenylphosphonic dichloride in the ranges from 349.26 K to 426.06 K and from 377.15 K to 457.65 K, respectively, were measured by a static method. The density data were fitted to a second-order polynomial, and the viscosity data were fitted to the Andrade equation. The results of Vapor Pressure of phenylphosphorus dichloride and phenylphosphonic dichloride were fitted to the Antoine equation. The density data of phenylphosphonic dichloride and Vapor Pressure data of phenylphosphorus dichloride and phenylphosphonic dichloride were compared with literature values.
Enrique A. Campanella - One of the best experts on this subject based on the ideXlab platform.
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A Vapor Pressure equation for heavy compounds
Chemical Engineering & Technology, 1997Co-Authors: Enrique A. CampanellaAbstract:A Vapor Pressure calculation procedure based on a lattice equation is applied to several compounds. Originally, the method was used to predict low Vapor Pressures of heavy hydrocarbons. In this work, the method is used at low Vapor Pressure for nonhydrocarbons, and a modified version is employed at high Vapor Pressure for n-alkanes. As the procedures require the knowledge of one Vapor Pressure datum only, they work in a predictive mode. Prediction for hydrocarbons is good and for nonhydrocarbons is poor. Prediction of n-alkanes high Vapor Pressure is good with an overall average relative absolute deviation under 6 percent.
