The Experts below are selected from a list of 1452 Experts worldwide ranked by ideXlab platform
Yun Whan Kang - One of the best experts on this subject based on the ideXlab platform.
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Isothermal Vapor−Liquid Equilibria for the Binary Systems of Chlorine with Difluoromethane, Chlorodifluoromethane, and Dichlorodifluoromethane at 10 °C
Journal of Chemical & Engineering Data, 1998Co-Authors: Yun Whan KangAbstract:Isothermal vapor-liquid equilibria for difluoromethane + chlorine, chlorodifluoromethane + chlorine, and Dichlorodifluoromethane + chlorine have been measured. The experimental data are correlated with the Peng-Robinson equation of state, and the relevant parameters are presented. All of the binary systems form minimum boiling homogeneous azeotropes at the experimental conditions. The correlation of the vapor-liquid equilibria was found to be in good agreement with the experimental data.
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isothermal vapor liquid equilibria for the binary systems of chlorine with difluoromethane chlorodifluoromethane and Dichlorodifluoromethane at 10 c
Journal of Chemical & Engineering Data, 1998Co-Authors: Yun Whan Kang, Sung Yong Cho, In Wook NahAbstract:Isothermal vapor-liquid equilibria for difluoromethane + chlorine, chlorodifluoromethane + chlorine, and Dichlorodifluoromethane + chlorine have been measured. The experimental data are correlated with the Peng-Robinson equation of state, and the relevant parameters are presented. All of the binary systems form minimum boiling homogeneous azeotropes at the experimental conditions. The correlation of the vapor-liquid equilibria was found to be in good agreement with the experimental data.
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Vapor−Liquid Equilibria for the Systems Difluoromethane + Hydrogen Fluoride, Dichlorodifluoromethane + Hydrogen Fluoride, and Chlorine + Hydrogen Fluoride
Journal of Chemical & Engineering Data, 1998Co-Authors: Yun Whan KangAbstract:Isothermal vapor-liquid equilibria for difluoromethane + hydrogen fluoride, Dichlorodifluoromethane + hydrogen fluoride, and chlorine + hydrogen fluoride have been measured. The experimental data for the binary systems are correlated with the NRTL equation with the vapor-phase association model for the mixtures containing hydrogen fluoride, and the relevant parameters are presented. The binary system difluoromethane + hydrogen fluoride forms a homogeneous liquid phase, and the others form minimum boiling heterogeneous azeotropes at the experimental conditions.
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vapor liquid equilibria for the systems difluoromethane hydrogen fluoride Dichlorodifluoromethane hydrogen fluoride and chlorine hydrogen fluoride
Journal of Chemical & Engineering Data, 1998Co-Authors: Yun Whan KangAbstract:Isothermal vapor-liquid equilibria for difluoromethane + hydrogen fluoride, Dichlorodifluoromethane + hydrogen fluoride, and chlorine + hydrogen fluoride have been measured. The experimental data for the binary systems are correlated with the NRTL equation with the vapor-phase association model for the mixtures containing hydrogen fluoride, and the relevant parameters are presented. The binary system difluoromethane + hydrogen fluoride forms a homogeneous liquid phase, and the others form minimum boiling heterogeneous azeotropes at the experimental conditions.
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vapor liquid equilibria for the systems difluoromethane chlorodifluoromethane difluoromethane Dichlorodifluoromethane and difluoromethane chloromethane at 10 0 c
Journal of Chemical & Engineering Data, 1996Co-Authors: Yun Whan Kang, Kun Yong ChungAbstract:Isothermal vapor−liquid equilibria for the three binary systems (difluoromethane + chlorodifluoromethane, difluoromethane + Dichlorodifluoromethane, and difluoromethane + chloromethane) have been measured at 10.0 °C. The experimental data for the binary systems are correlated with the Wilson equation and the relevant parameters are presented. The difluoromethane + Dichlorodifluoromethane system forms a minimum boiling azeotrope, but the others do not.
Kun Yong Chung - One of the best experts on this subject based on the ideXlab platform.
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vapor liquid equilibria for the systems difluoromethane chlorodifluoromethane difluoromethane Dichlorodifluoromethane and difluoromethane chloromethane at 10 0 c
Journal of Chemical & Engineering Data, 1996Co-Authors: Yun Whan Kang, Kun Yong ChungAbstract:Isothermal vapor−liquid equilibria for the three binary systems (difluoromethane + chlorodifluoromethane, difluoromethane + Dichlorodifluoromethane, and difluoromethane + chloromethane) have been measured at 10.0 °C. The experimental data for the binary systems are correlated with the Wilson equation and the relevant parameters are presented. The difluoromethane + Dichlorodifluoromethane system forms a minimum boiling azeotrope, but the others do not.
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Vapor−Liquid Equilibria for the Systems Difluoromethane + Chlorodifluoromethane, Difluoromethane + Dichlorodifluoromethane, and Difluoromethane + Chloromethane at 10.0 °C
Journal of Chemical & Engineering Data, 1996Co-Authors: Yun Whan Kang, Kun Yong ChungAbstract:Isothermal vapor−liquid equilibria for the three binary systems (difluoromethane + chlorodifluoromethane, difluoromethane + Dichlorodifluoromethane, and difluoromethane + chloromethane) have been measured at 10.0 °C. The experimental data for the binary systems are correlated with the Wilson equation and the relevant parameters are presented. The difluoromethane + Dichlorodifluoromethane system forms a minimum boiling azeotrope, but the others do not.
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Vapor-liquid equilibria for the systems difluoromethane + chlorodifluoromethane, difluoromethane + Dichlorodifluoromethane, and difluoromethane + chloromethane at 10.0 C
Journal of Chemical & Engineering Data, 1996Co-Authors: Yun Whan Kang, Kun Yong ChungAbstract:Isothermal vapor−liquid equilibria for the three binary systems (difluoromethane + chlorodifluoromethane, difluoromethane + Dichlorodifluoromethane, and difluoromethane + chloromethane) have been measured at 10.0 °C. The experimental data for the binary systems are correlated with the Wilson equation and the relevant parameters are presented. The difluoromethane + Dichlorodifluoromethane system forms a minimum boiling azeotrope, but the others do not.
Hitoshi Jindai - One of the best experts on this subject based on the ideXlab platform.
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Decomposition of Dichlorodifluoromethane of titania/silica
Industrial & Engineering Chemistry Research, 1990Co-Authors: Seiichiro Imamura, Toshihiko Shiomi, Shingo Ishida, Kazunori Utani, Hitoshi JindaiAbstract:Catalytic decomposition of Dichlorodifluoromethane was carried out on various metal oxides. Acid catalysts such as zeolite, silica-alumina, and titatnia-silica exhibited high decomposition activities, whereas the activities of transition-metal oxides and CaO were low. Titania-silica exhibited the best performance among the acid catalysts investigated. Its acid property correlated well with its activity ; the strong acid site with a Hammett acidity parameter H 0 of less than -5.6 was effective in decomposing Dichlorodifluoromethane. Deactivation, however, occurred rapidly due to an attack of fluorine on silicon in titatnia-silica. A combination of titania-silica with CaO, which reacted with fluorine more readily than did silicon, protected the titania-silica from corrosion by fluorine, and the lifetime of this catalyst was prolonged
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decomposition of Dichlorodifluoromethane of titania silica
Industrial & Engineering Chemistry Research, 1990Co-Authors: Seiichiro Imamura, Toshihiko Shiomi, Shingo Ishida, Kazunori Utani, Hitoshi JindaiAbstract:Catalytic decomposition of Dichlorodifluoromethane was carried out on various metal oxides. Acid catalysts such as zeolite, silica-alumina, and titatnia-silica exhibited high decomposition activities, whereas the activities of transition-metal oxides and CaO were low. Titania-silica exhibited the best performance among the acid catalysts investigated. Its acid property correlated well with its activity ; the strong acid site with a Hammett acidity parameter H 0 of less than -5.6 was effective in decomposing Dichlorodifluoromethane. Deactivation, however, occurred rapidly due to an attack of fluorine on silicon in titatnia-silica. A combination of titania-silica with CaO, which reacted with fluorine more readily than did silicon, protected the titania-silica from corrosion by fluorine, and the lifetime of this catalyst was prolonged
Seiichiro Imamura - One of the best experts on this subject based on the ideXlab platform.
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Decomposition of Dichlorodifluoromethane on phosphate group-impregnated zirconia (PO4-ZrO2) catalyst
Industrial & Engineering Chemistry Research, 1993Co-Authors: Seiichiro Imamura, Kazunori Utani, Hideaki Shimizu, Toshiki Haga, Seizaburo Tsuji, Makoto WatanabeAbstract:The activity and durability of phosphate-zirconia composite catalysts were examined in the decomposition of Dichlorodifluoromethane (Freon 12). Combination of phosphate group with zirconia produced acid sites which were effective for decomposing Freon 12: 100% conversion of Freon 12 was attained at a temperature as low as 300 C on the phosphate-zirconia catalyst which had a superacid nature. The phosphate group also protected the surface of zirconia from poisoning by inorganic fluorides produced during the reaction. An addition of water helped maintain the activity of the catalyst by eliminating inorganic fluorides accumulated on its surface.
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special articles on global and regional environment and chemistry catalytic decomposition of Dichlorodifluoromethane a study on the catalysts durable against fluorine
Nippon Kagaku Kaishi, 1991Co-Authors: Seiichiro Imamura, Kenichiro Imakubo, Yoshikazu FujimuraAbstract:Catalytic decomposition of Dichlorodifluoromethane was carried out on various catalysts. Metal oxide catalysts such as CeO2 and Nb2O5 exhibited high activity; however, they were deactivated rapidly due to an attack by inorganic fluorines produced during the reaction. Although sulfuric acid impregnated on supports was also active, the vaporization of sulfur in the form of sulfur oxides lead to the deactivation of this catalyst. The BPO4 was active and retained its activity for prolonged reaction time. It was assumed that phosphate-based catalysts were the only possible system which can be applied to the decomposition of chlorofluorocarbons.
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Decomposition of Dichlorodifluoromethane of titania/silica
Industrial & Engineering Chemistry Research, 1990Co-Authors: Seiichiro Imamura, Toshihiko Shiomi, Shingo Ishida, Kazunori Utani, Hitoshi JindaiAbstract:Catalytic decomposition of Dichlorodifluoromethane was carried out on various metal oxides. Acid catalysts such as zeolite, silica-alumina, and titatnia-silica exhibited high decomposition activities, whereas the activities of transition-metal oxides and CaO were low. Titania-silica exhibited the best performance among the acid catalysts investigated. Its acid property correlated well with its activity ; the strong acid site with a Hammett acidity parameter H 0 of less than -5.6 was effective in decomposing Dichlorodifluoromethane. Deactivation, however, occurred rapidly due to an attack of fluorine on silicon in titatnia-silica. A combination of titania-silica with CaO, which reacted with fluorine more readily than did silicon, protected the titania-silica from corrosion by fluorine, and the lifetime of this catalyst was prolonged
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decomposition of Dichlorodifluoromethane of titania silica
Industrial & Engineering Chemistry Research, 1990Co-Authors: Seiichiro Imamura, Toshihiko Shiomi, Shingo Ishida, Kazunori Utani, Hitoshi JindaiAbstract:Catalytic decomposition of Dichlorodifluoromethane was carried out on various metal oxides. Acid catalysts such as zeolite, silica-alumina, and titatnia-silica exhibited high decomposition activities, whereas the activities of transition-metal oxides and CaO were low. Titania-silica exhibited the best performance among the acid catalysts investigated. Its acid property correlated well with its activity ; the strong acid site with a Hammett acidity parameter H 0 of less than -5.6 was effective in decomposing Dichlorodifluoromethane. Deactivation, however, occurred rapidly due to an attack of fluorine on silicon in titatnia-silica. A combination of titania-silica with CaO, which reacted with fluorine more readily than did silicon, protected the titania-silica from corrosion by fluorine, and the lifetime of this catalyst was prolonged
In Wook Nah - One of the best experts on this subject based on the ideXlab platform.
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isothermal vapor liquid equilibria for the binary systems of chlorine with difluoromethane chlorodifluoromethane and Dichlorodifluoromethane at 10 c
Journal of Chemical & Engineering Data, 1998Co-Authors: Yun Whan Kang, Sung Yong Cho, In Wook NahAbstract:Isothermal vapor-liquid equilibria for difluoromethane + chlorine, chlorodifluoromethane + chlorine, and Dichlorodifluoromethane + chlorine have been measured. The experimental data are correlated with the Peng-Robinson equation of state, and the relevant parameters are presented. All of the binary systems form minimum boiling homogeneous azeotropes at the experimental conditions. The correlation of the vapor-liquid equilibria was found to be in good agreement with the experimental data.