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Deresh Ramjugernath - One of the best experts on this subject based on the ideXlab platform.
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Isothermal Vapor–Liquid Equilibrium Data for the 1,1,2,2-Tetrafluoroethene + 1,1,2,2,3,3,4,4-Octafluorocyclobutane Binary System: Measurement and Modeling from (248 to 283) K
Journal of Chemical & Engineering Data, 2012Co-Authors: Francois Jacobus Conradie, Philippus L. Crouse, Xavier Courtial, Izak J. Van Der Walt, Deresh RamjugernathAbstract:High pressure vapor–liquid equilibrium data are presented for the 1,1,2,2-Tetrafluoroethene + 1,1,2,2,3,3,4,4-octafluorocyclobutane binary system. The isothermal measurements were undertaken at (248.3, 263.0, and 282.9) K, with pressures ranging from (0.040 to 2.340) MPa. A static–analytical apparatus was used to carry out the measurements. The liquid and vapor phases were sampled at equilibrium using a movable rapid on-line sampler–injector (ROLSI). The uncertainties in the measurements are less than 0.1 K, 1.5 kPa, and 0.007 for the temperature, pressure, and equilibrium phase mole fractions, respectively. The experimental data were correlated with the Peng–Robinson equation of state incorporating the Mathias–Copeman alpha function, with the Wong–Sandler mixing rule utilizing the nonrandom two-liquid (NRTL) activity coefficient model. The model accurately describes the experimental data.
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isothermal vapor liquid equilibrium data for the 1 1 2 2 Tetrafluoroethene 1 1 2 2 3 3 4 4 octafluorocyclobutane binary system measurement and modeling from 248 to 283 k
Journal of Chemical & Engineering Data, 2012Co-Authors: Francois Jacobus Conradie, Philippus L. Crouse, Xavier Courtial, Izak J. Van Der Walt, Deresh RamjugernathAbstract:High pressure vapor–liquid equilibrium data are presented for the 1,1,2,2-Tetrafluoroethene + 1,1,2,2,3,3,4,4-octafluorocyclobutane binary system. The isothermal measurements were undertaken at (248.3, 263.0, and 282.9) K, with pressures ranging from (0.040 to 2.340) MPa. A static–analytical apparatus was used to carry out the measurements. The liquid and vapor phases were sampled at equilibrium using a movable rapid on-line sampler–injector (ROLSI). The uncertainties in the measurements are less than 0.1 K, 1.5 kPa, and 0.007 for the temperature, pressure, and equilibrium phase mole fractions, respectively. The experimental data were correlated with the Peng–Robinson equation of state incorporating the Mathias–Copeman alpha function, with the Wong–Sandler mixing rule utilizing the nonrandom two-liquid (NRTL) activity coefficient model. The model accurately describes the experimental data.
Francois Jacobus Conradie - One of the best experts on this subject based on the ideXlab platform.
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Isothermal Vapor–Liquid Equilibrium Data for the 1,1,2,2-Tetrafluoroethene + 1,1,2,2,3,3,4,4-Octafluorocyclobutane Binary System: Measurement and Modeling from (248 to 283) K
Journal of Chemical & Engineering Data, 2012Co-Authors: Francois Jacobus Conradie, Philippus L. Crouse, Xavier Courtial, Izak J. Van Der Walt, Deresh RamjugernathAbstract:High pressure vapor–liquid equilibrium data are presented for the 1,1,2,2-Tetrafluoroethene + 1,1,2,2,3,3,4,4-octafluorocyclobutane binary system. The isothermal measurements were undertaken at (248.3, 263.0, and 282.9) K, with pressures ranging from (0.040 to 2.340) MPa. A static–analytical apparatus was used to carry out the measurements. The liquid and vapor phases were sampled at equilibrium using a movable rapid on-line sampler–injector (ROLSI). The uncertainties in the measurements are less than 0.1 K, 1.5 kPa, and 0.007 for the temperature, pressure, and equilibrium phase mole fractions, respectively. The experimental data were correlated with the Peng–Robinson equation of state incorporating the Mathias–Copeman alpha function, with the Wong–Sandler mixing rule utilizing the nonrandom two-liquid (NRTL) activity coefficient model. The model accurately describes the experimental data.
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isothermal vapor liquid equilibrium data for the 1 1 2 2 Tetrafluoroethene 1 1 2 2 3 3 4 4 octafluorocyclobutane binary system measurement and modeling from 248 to 283 k
Journal of Chemical & Engineering Data, 2012Co-Authors: Francois Jacobus Conradie, Philippus L. Crouse, Xavier Courtial, Izak J. Van Der Walt, Deresh RamjugernathAbstract:High pressure vapor–liquid equilibrium data are presented for the 1,1,2,2-Tetrafluoroethene + 1,1,2,2,3,3,4,4-octafluorocyclobutane binary system. The isothermal measurements were undertaken at (248.3, 263.0, and 282.9) K, with pressures ranging from (0.040 to 2.340) MPa. A static–analytical apparatus was used to carry out the measurements. The liquid and vapor phases were sampled at equilibrium using a movable rapid on-line sampler–injector (ROLSI). The uncertainties in the measurements are less than 0.1 K, 1.5 kPa, and 0.007 for the temperature, pressure, and equilibrium phase mole fractions, respectively. The experimental data were correlated with the Peng–Robinson equation of state incorporating the Mathias–Copeman alpha function, with the Wong–Sandler mixing rule utilizing the nonrandom two-liquid (NRTL) activity coefficient model. The model accurately describes the experimental data.
Dominique Richon - One of the best experts on this subject based on the ideXlab platform.
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Vapor-liquid equilibrium data for the (hexafluoroethane +1,1,1,2-tetrafluoroethane) system at temperatures from 263 to 353 K and pressures up to 4.16 MPa
Fluid Phase Equilibria, 2008Co-Authors: Hakim Madani, Alain Valtz, Christophe Coquelet, Abdeslam-hassen Meniai, Dominique RichonAbstract:Isothermal vapor-liquid equilibrium data are reported for the binary system of hexafluoroethane and 1,1,1,2-tetrafluoroethane in the temperature range 263-353 K and in the pressure range 0.2-4.2 MPa. Areliable "static- analytic" method taking advantage of two online micro-capillary ROLSI™ samplers is used for all the measurements. The data are correlated using our in-house (ThermoSoft) thermodynamic software based on the Peng-Robinson equation of state, the Mathias-Copeman alpha function, the Wong-Sandier mixing rules, and the NRTL model.
Heng-dao Quan - One of the best experts on this subject based on the ideXlab platform.
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The disproportionation of CF2 carbene in vapor-phase pyrolysis reaction over activated carbon and porous aluminum fluoride
Journal of Molecular Catalysis A-chemical, 2009Co-Authors: Guang-cheng Yang, Xiao-qing Jia, Renming Pan, Heng-dao QuanAbstract:Abstract During the process of pyrolysis of chlorodifluormethane, trifluoromethane and hexafluoropropylene oxide in the presence of supporters, like activated carbon (AC) and porous aluminum fluoride (PAF), no Tetrafluoroethene (TFE) was detected at early time-on-stream (TOS), and some compounds containing CF 3 group were generated instead of the formation of TFE. The pyrolysis process is much different from that without supporters. It is proposed that the disproportionation reaction of CF 2 carbene may take place on the surface of supporters to produce CF 3 radical and carbon.
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Preparation of 1,1,1,2-tetrafluoroethane by the vapor-phase catalytic reaction of 1,1,1-trifluoro-2-chloroethane with anhydrous hydrogen fluoride
Journal of Fluorine Chemistry, 2001Co-Authors: Heng-dao Quan, Hui-e Yang, Li Zhong, Jian-zhang RenAbstract:Abstract 1,1,1,2-Tetrafluoroethane was prepared in 97% selectivity by the vapor-phase catalytic reaction of 1,1,1-trifluoro-2-chloroethane with anhydrous hydrogen fluoride (AHF) over a metal fluoride catalyst (CrF 3 and CoF 2 ) supported on porous aluminum fluoride (PAF). The relationship between the crystalline phase transition of porous aluminum fluoride and temperature from 100 to 640°C was investigated by X-ray diffraction.
Lars Öhrström - One of the best experts on this subject based on the ideXlab platform.
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X-ray Structures and DFT Calculations on Rhodium−Olefin Complexes: Comments on the 103Rh NMR Shift−Stability Correlation
Organometallics, 2000Co-Authors: Michael Bühl, Mikael Håkansson, And Amir H. Mahmoudkhani, Lars ÖhrströmAbstract:The low-temperature X-ray structures of bis(eta (2)-ethene)(2,4-pentanedionato)rhodium(I) (1)- and bis(eta (2)-ethene)(1,1,1,5,5,5-hexafluoro-2,4-pentanedionato)rhodium(I) (2) were determined. Very similar Rh-ethene coordination geometries are found in the solid state, i.e., 1, Rh-C = 2.127(5) Angstrom, and 2, Rh-C = 2.121(3) Angstrom, in good accord with DFT calculations, i.e., 1, RB-C = 2.132 Angstrom and 2, Rh-C = 2.136 Angstrom. The calculated Rh-103 NMR chemical shifts (GIAO-B3LYP/II level) for a range of bis(eta (2)-alkene)(2,4-pentanedionato)rhodium(I) complexes also agree well with solution NMR data. The empirical correlation between transition-metal shifts and stability constants (Ohrstrom, L. Comm. Inorg. Chem. 1996, 18, 305) could be confirmed for simple alkenes, since the computed relative Rh-alkene binding energies were found to correlate with delta(Rh-103). I, contrast, chelating or fluorinated alkenes showed large deviations from this correlation. The steric and electronic effects on the Rh-alkene bond are discussed and analyzed in terms of Bader's atoms-in-molecules theory, which revealed qualitatively different binding modes of ethene and Tetrafluoroethene to rhodium: ethene forms typical pi -complexes in the Dewar-Chatt-Duncanson model, whereas Tetrafluoroethene complexes are on the borderline to metallacyclopropanes.