The Experts below are selected from a list of 618 Experts worldwide ranked by ideXlab platform
Nan Meng - One of the best experts on this subject based on the ideXlab platform.
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isobaric vapor liquid equilibrium for the binary system of hexamethyl Disiloxane isopropyl acetate at atmospheric pressure
Journal of Chemical & Engineering Data, 2013Co-Authors: Wenlin Zhang, Xiaowen Wang, Nan MengAbstract:Isobaric vapor–liquid equilibrium (VLE) data for the hexamethyl Disiloxane + isopropyl acetate system at atmospheric pressure (101.3 kPa) were measured. The thermodynamic consistency of experimental data was checked with the Herrington method. The experimental binary data were correlated with Wilson, nonrandom two-liquid (NRTL), and universal quasichemical (UNIQUAC) two-parameter models. All three models satisfactorily fitted with the experimental data and the Wilson model was the most suitable one to represent the VLE data. The result showed that the standard deviations of the Wilson model in temperature and vapor phase were 0.2279 and 0.0568, respectively. The system presents a minimum temperature azeotrope at 361.12 K with the mole fraction of hexamethyl Disiloxane as 0.1572.
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isobaric vapor liquid equilibrium of hexamethyl Disiloxane sec butyl acetate system at normal pressure
Energy Procedia, 2012Co-Authors: Wenlin Zhang, Nan Meng, Ruyi Sun, Yongjun ShaoAbstract:Abstract Vapor-liquid equilibrium data of hexamethyl Disiloxane + sec-butyl acetate system at 101.3 kPa was measured by using double circulating vapor-liquid equilibrium still. The thermodynamic consistency of the VLE data was examined by Herrington method. Experimental data was correlated by NRTL and UNIQUAC parameter models. Both of the models satisfactorily correlated with the VLE data. The result showed that the UNIQUAC model was the most suitable one to represent experimental data satisfactorily. The UNIQUAC standard deviation in temperature and in vapor phase composition were 0.3338, and 0.0114, respectively.
Oliver Weichold - One of the best experts on this subject based on the ideXlab platform.
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host guest chemistry in a urea matrix catalytic and selective oxidation of triorganosilanes to the corresponding silanols by methyltrioxorhenium and the urea hydrogen peroxide adduct
Journal of the American Chemical Society, 1999Co-Authors: Catherine M Mitchell, Chantu R Sahamoller, Oliver WeicholdAbstract:The oxidation of silanes to silanols, catalyzed by methyltrioxorhenium (MTO), proceeds in high conversions and excellent selectivities in favor of the silanol (no Disiloxane product) when the urea/...
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host guest chemistry in a urea matrix catalytic and selective oxidation of triorganosilanes to the corresponding silanols by methyltrioxorhenium and the urea hydrogen peroxide adduct
Journal of the American Chemical Society, 1999Co-Authors: Catherine M Mitchell, Chantu R Sahamoller, Oliver WeicholdAbstract:The oxidation of silanes to silanols, catalyzed by methyltrioxorhenium (MTO), proceeds in high conversions and excellent selectivities in favor of the silanol (no Disiloxane product) when the urea/hydrogen peroxide adduct (UHP) is used as oxygen source instead of 85% aqueous H2O2. It is proposed that this novel Si−H oxidation takes place in the helical urea channels, in which the urea matrix serves as host for the silane substrate, the H2O2 oxygen source, and the MTO metal catalyst as guests. In this confined environment, the metal catalyst is stabilized against decomposition, and this enhances higher conversions while condensation of the silanol to its Disiloxane is avoided for steric reasons. The oxidation of the optically active silane (S)-(α-Np)PhMeSiH proceeds with retention of configuration in excellent yield. To date, no catalytic Si−H oxygen insertion has been reported for the preparation of optically active silanols. In analogy with the stereoselectivity in the dioxirane oxidation of (+)-(α-Np)Ph...
Richard D Noble - One of the best experts on this subject based on the ideXlab platform.
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ideal co2 light gas separation performance of poly vinylimidazolium membranes and poly vinylimidazolium ionic liquid composite films
Industrial & Engineering Chemistry Research, 2013Co-Authors: Trevor K Carlisle, Erin F Wiesenauer, Garret D Nicodemus, Douglas L Gin, Richard D NobleAbstract:Six vinyl-based, imidazolium room-temperature ionic liquid (RTIL) monomers were synthesized and photopolymerized to form dense poly(RTIL) membranes. The effect of polymer backbone (i.e., poly(ethylene), poly(styrene), and poly(acrylate)) and functional cationic substituent (e.g., alkyl, fluoroalkyl, oligo(ethylene glycol), and Disiloxane) on ideal CO2/N2 and CO2/CH4 membrane separation performance was investigated. The vinyl-based poly(RTIL)s were found to be generally less CO2-selective compared to analogous styrene- and acrylate-based poly(RTIL)s. The CO2 permeability of n-hexyl- (69 barrers) and Disiloxane- (130 barrers) substituted vinyl-based poly(RTIL)s were found to be exceptionally larger than that of previously studied styrene and acrylate poly(RTIL)s. The CO2 selectivity of oligo(ethylene glycol)-functionalized vinyl poly(RTIL)s was enhanced, and the CO2 permeability was reduced when compared to the n-hexyl-substituted vinyl-based poly(RTIL). Nominal improvement in CO2/CH4 selectivity was observ...
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Ideal CO2/Light Gas Separation Performance of Poly(vinylimidazolium) Membranes and Poly(vinylimidazolium)-Ionic Liquid Composite Films
2013Co-Authors: Trevor K. Carlisle, Erin F Wiesenauer, Garret D Nicodemus, Douglas L Gin, Richard D NobleAbstract:Six vinyl-based, imidazolium room-temperature ionic liquid (RTIL) monomers were synthesized and photopolymerized to form dense poly(RTIL) membranes. The effect of polymer backbone (i.e., poly(ethylene), poly(styrene), and poly(acrylate)) and functional cationic substituent (e.g., alkyl, fluoroalkyl, oligo(ethylene glycol), and Disiloxane) on ideal CO2/N2 and CO2/CH4 membrane separation performance was investigated. The vinyl-based poly(RTIL)s were found to be generally less CO2-selective compared to analogous styrene- and acrylate-based poly(RTIL)s. The CO2 permeability of n-hexyl- (69 barrers) and Disiloxane- (130 barrers) substituted vinyl-based poly(RTIL)s were found to be exceptionally larger than that of previously studied styrene and acrylate poly(RTIL)s. The CO2 selectivity of oligo(ethylene glycol)-functionalized vinyl poly(RTIL)s was enhanced, and the CO2 permeability was reduced when compared to the n-hexyl-substituted vinyl-based poly(RTIL). Nominal improvement in CO2/CH4 selectivity was observed upon fluorination of the n-hexyl vinyl-based poly(RTIL), with no observed change in CO2 permeability. However, rather dramatic improvements in both CO2 permeability and selectivity were observed upon blending 20 mol % RTIL (emim Tf2N) into the n-hexyl- and Disiloxane-functionalized vinyl poly(RTIL)s to form solid–liquid composite films
Wenlin Zhang - One of the best experts on this subject based on the ideXlab platform.
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isobaric vapor liquid equilibrium for the binary system of hexamethyl Disiloxane isopropyl acetate at atmospheric pressure
Journal of Chemical & Engineering Data, 2013Co-Authors: Wenlin Zhang, Xiaowen Wang, Nan MengAbstract:Isobaric vapor–liquid equilibrium (VLE) data for the hexamethyl Disiloxane + isopropyl acetate system at atmospheric pressure (101.3 kPa) were measured. The thermodynamic consistency of experimental data was checked with the Herrington method. The experimental binary data were correlated with Wilson, nonrandom two-liquid (NRTL), and universal quasichemical (UNIQUAC) two-parameter models. All three models satisfactorily fitted with the experimental data and the Wilson model was the most suitable one to represent the VLE data. The result showed that the standard deviations of the Wilson model in temperature and vapor phase were 0.2279 and 0.0568, respectively. The system presents a minimum temperature azeotrope at 361.12 K with the mole fraction of hexamethyl Disiloxane as 0.1572.
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isobaric vapor liquid equilibrium of hexamethyl Disiloxane sec butyl acetate system at normal pressure
Energy Procedia, 2012Co-Authors: Wenlin Zhang, Nan Meng, Ruyi Sun, Yongjun ShaoAbstract:Abstract Vapor-liquid equilibrium data of hexamethyl Disiloxane + sec-butyl acetate system at 101.3 kPa was measured by using double circulating vapor-liquid equilibrium still. The thermodynamic consistency of the VLE data was examined by Herrington method. Experimental data was correlated by NRTL and UNIQUAC parameter models. Both of the models satisfactorily correlated with the VLE data. The result showed that the UNIQUAC model was the most suitable one to represent experimental data satisfactorily. The UNIQUAC standard deviation in temperature and in vapor phase composition were 0.3338, and 0.0114, respectively.
Catherine M Mitchell - One of the best experts on this subject based on the ideXlab platform.
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host guest chemistry in a urea matrix catalytic and selective oxidation of triorganosilanes to the corresponding silanols by methyltrioxorhenium and the urea hydrogen peroxide adduct
Journal of the American Chemical Society, 1999Co-Authors: Catherine M Mitchell, Chantu R Sahamoller, Oliver WeicholdAbstract:The oxidation of silanes to silanols, catalyzed by methyltrioxorhenium (MTO), proceeds in high conversions and excellent selectivities in favor of the silanol (no Disiloxane product) when the urea/...
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host guest chemistry in a urea matrix catalytic and selective oxidation of triorganosilanes to the corresponding silanols by methyltrioxorhenium and the urea hydrogen peroxide adduct
Journal of the American Chemical Society, 1999Co-Authors: Catherine M Mitchell, Chantu R Sahamoller, Oliver WeicholdAbstract:The oxidation of silanes to silanols, catalyzed by methyltrioxorhenium (MTO), proceeds in high conversions and excellent selectivities in favor of the silanol (no Disiloxane product) when the urea/hydrogen peroxide adduct (UHP) is used as oxygen source instead of 85% aqueous H2O2. It is proposed that this novel Si−H oxidation takes place in the helical urea channels, in which the urea matrix serves as host for the silane substrate, the H2O2 oxygen source, and the MTO metal catalyst as guests. In this confined environment, the metal catalyst is stabilized against decomposition, and this enhances higher conversions while condensation of the silanol to its Disiloxane is avoided for steric reasons. The oxidation of the optically active silane (S)-(α-Np)PhMeSiH proceeds with retention of configuration in excellent yield. To date, no catalytic Si−H oxygen insertion has been reported for the preparation of optically active silanols. In analogy with the stereoselectivity in the dioxirane oxidation of (+)-(α-Np)Ph...