The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Terunori Fujita - One of the best experts on this subject based on the ideXlab platform.
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Trimerization of Ethylene to 1-Hexene with Titanium Complexes Bearing Phenoxy−Imine Ligands with Pendant Donors Combined with MAO
Organometallics, 2010Co-Authors: Yasuhiko Suzuki, Shinsuke Kinoshita, Atsushi Shibahara, Seiichi Ishii, Kazumori Kawamura, Yoshihisa Inoue, Terunori FujitaAbstract:New Ti complexes bearing phenoxy−imine ligands with pendant aryl−OMe donors have been developed for ethylene trimerization to produce 1-Hexene. These Ti complexes combined with methylaluminoxane selectively trimerize ethylene to form 1-Hexene with exceptionally high activity (e.g., 6.59 tons of 1-Hexene/((g of Ti) h)) .
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trimerization of ethylene to 1 Hexene with titanium complexes bearing phenoxy imine ligands with pendant donors combined with mao
Organometallics, 2010Co-Authors: Yasuhiko Suzuki, Shinsuke Kinoshita, Atsushi Shibahara, Seiichi Ishii, Kazumori Kawamura, Yoshihisa Inoue, Terunori FujitaAbstract:New Ti complexes bearing phenoxy−imine ligands with pendant aryl−OMe donors have been developed for ethylene trimerization to produce 1-Hexene. These Ti complexes combined with methylaluminoxane selectively trimerize ethylene to form 1-Hexene with exceptionally high activity (e.g., 6.59 tons of 1-Hexene/((g of Ti) h)) .
Yasuhiko Suzuki - One of the best experts on this subject based on the ideXlab platform.
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Trimerization of Ethylene to 1-Hexene with Titanium Complexes Bearing Phenoxy−Imine Ligands with Pendant Donors Combined with MAO
Organometallics, 2010Co-Authors: Yasuhiko Suzuki, Shinsuke Kinoshita, Atsushi Shibahara, Seiichi Ishii, Kazumori Kawamura, Yoshihisa Inoue, Terunori FujitaAbstract:New Ti complexes bearing phenoxy−imine ligands with pendant aryl−OMe donors have been developed for ethylene trimerization to produce 1-Hexene. These Ti complexes combined with methylaluminoxane selectively trimerize ethylene to form 1-Hexene with exceptionally high activity (e.g., 6.59 tons of 1-Hexene/((g of Ti) h)) .
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trimerization of ethylene to 1 Hexene with titanium complexes bearing phenoxy imine ligands with pendant donors combined with mao
Organometallics, 2010Co-Authors: Yasuhiko Suzuki, Shinsuke Kinoshita, Atsushi Shibahara, Seiichi Ishii, Kazumori Kawamura, Yoshihisa Inoue, Terunori FujitaAbstract:New Ti complexes bearing phenoxy−imine ligands with pendant aryl−OMe donors have been developed for ethylene trimerization to produce 1-Hexene. These Ti complexes combined with methylaluminoxane selectively trimerize ethylene to form 1-Hexene with exceptionally high activity (e.g., 6.59 tons of 1-Hexene/((g of Ti) h)) .
Ricardo Reich - One of the best experts on this subject based on the ideXlab platform.
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Phase Equilibria in the Systems 1-Hexene + Heptane and 1-Hexene + Ethyl 1,1-Dimethylethyl Ether + Heptane at 94.00 kPa
Physics and Chemistry of Liquids, 2002Co-Authors: Hugo Segura, Jaime Wisniak, Graciela Galindo, Ricardo ReichAbstract:Abstract Consistent vapor-liquid equilibrium data at 94.00 kPa have been determined for the ternary system 1-Hexene + ethyl 1,1-dimethylethyl ether + heptane and for its constituent binary I-Hexene + heptane, in the temperature range 334 to 369 K. According to the experimental results the ternary system 1-Hexene + ethyl 1,1-dimethylethyl ether + heptane exhibits moderate positive deviations from ideal behavior. The binary system I-Hexene + heptane exhibits slight negative deviations from ideal behavior. None of the systems present an azeotrope. The vapor liquid equilibrium data have been correlated with the mole fraction using the Redlich-Kister, Wilson, NRTL, UNIQUAC, and Tamir relations. These models, in addition to UNIFAC, allow good prediction of the VLE properties of the ternary system from those of the pertinent binary systems.
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Phase Equilibria in the Systems 1-Hexene + 2,2,4-Trimethylpentane and 1-Hexene + Ethyl 1,1-Dimethylethyl Ether + 2,2,4-Trimethylpentane at 94.00 kPa
Journal of Chemical & Engineering Data, 2001Co-Authors: Hugo Segura, Jaime Wisniak, And Graciela Galindo, Ricardo ReichAbstract:Isobaric vapor−liquid equilibrium (VLE) data at 94.00 kPa have been determined for the ternary system 1-Hexene + ethyl 1,1-dimethylethyl ether + benzene and for its constituent binary system 1-Hexene + 2,2,4-trimethylpentane (isooctane), in the temperature range 335 to 360 K. According to the experimental results, the system 1-Hexene + 2,2,4-trimethylpentane exhibits ideal behavior. The ternary system exhibits slight positive deviations from ideal behavior, and no azeotrope is present. The VLE data have been correlated with the mole fraction using the Redlich−Kister, Wilson, NRTL, UNIQUAC, and Wisniak−Tamir relations. These models, in addition to UNIFAC, allow good prediction of the VLE properties of the ternary system from those of the pertinent binary systems.
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Phase Equilibria in the Systems 1-Hexene + Benzene and 1-Hexene + Ethyl 1,1-Dimethylethyl Ether + Benzene at 94.00 kPa
Journal of Chemical & Engineering Data, 2001Co-Authors: Hugo Segura, Jaime Wisniak, And Graciela Galindo, Ricardo ReichAbstract:Consistent vapor−liquid equilibria data at 94.00 kPa have been determined for the ternary system 1-Hexene + ethyl 1,1-dimethylethyl ether + benzene and for its constituent binary 1-Hexene + benzene, in the temperature range 334−351 K. According to the experimental results, the systems exhibit slight positive deviations from ideal behavior and no azeotrope is present. The VLE data have been correlated with the mole fraction using the Redlich−Kister, Wilson, NRTL, UNIQUAC, and Tamir relations. These models, in addition to UNIFAC, allow good prediction of the VLE properties of the ternary system from those of the pertinent binary systems.
Zhiqiang Fan - One of the best experts on this subject based on the ideXlab platform.
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effects of comonomer on active center distribution of tcl4 mgcl2 alet3 catalyst in ethylene 1 Hexene copolymerization
Journal of Organometallic Chemistry, 2015Co-Authors: Hongrui Yang, Zhiqiang FanAbstract:Abstract Ethylene/1-Hexene copolymerization with MgCl2/TiCl4–AlEt3 catalyst has been conducted under different initial 1-Hexene concentration (0–0.5 mol/L). Number of polymerization active centers was determined by quenching the reaction with 2-thiophenecarbonyl chloride and measuring sulfur content of the quenched polymer. Each copolymer sample was fractionated into boiling n-heptane soluble and insoluble fractions, and active centers in these fractions were also counted. The rate constants of ethylene and 1-Hexene insertion in the active centers were calculated, respectively. Molecular weight distribution (MWD) curves of the polymers were deconvoluted with 4–5 Flory components, and changes of activity of the Flory components with [1-Hexene] were analyzed. The polymerization activity and the number of active centers were significantly enhanced by increasing [1-Hexene]. Large number of active centers were revived by small amount of 1-Hexene. With the increase of [1-Hexene], the number of active centers producing polymer chains with lower molecular weight and higher 1-Hexene content was increased more than those producing polymer chains with higher molecular weight and lower 1-Hexene content, and the MWD curve continuously inclined to the low molecular weight side. The active centers with higher 1-Hexene incorporation rate have relatively smaller rate constant of ethylene insertion. When [1-Hexene] was increased, the rate constant of ethylene insertion was only slightly changed, but the rate constant of 1-Hexene insertion was markedly lowered, meaning that the active centers revived by 1-Hexene have relatively lower ability of incorporating 1-Hexene.
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Effects of comonomer on active center distribution of TCl4/MgCl2–AlEt3 catalyst in ethylene/1-Hexene copolymerization
Journal of Organometallic Chemistry, 2015Co-Authors: Hongrui Yang, Zhiqiang FanAbstract:Abstract Ethylene/1-Hexene copolymerization with MgCl2/TiCl4–AlEt3 catalyst has been conducted under different initial 1-Hexene concentration (0–0.5 mol/L). Number of polymerization active centers was determined by quenching the reaction with 2-thiophenecarbonyl chloride and measuring sulfur content of the quenched polymer. Each copolymer sample was fractionated into boiling n-heptane soluble and insoluble fractions, and active centers in these fractions were also counted. The rate constants of ethylene and 1-Hexene insertion in the active centers were calculated, respectively. Molecular weight distribution (MWD) curves of the polymers were deconvoluted with 4–5 Flory components, and changes of activity of the Flory components with [1-Hexene] were analyzed. The polymerization activity and the number of active centers were significantly enhanced by increasing [1-Hexene]. Large number of active centers were revived by small amount of 1-Hexene. With the increase of [1-Hexene], the number of active centers producing polymer chains with lower molecular weight and higher 1-Hexene content was increased more than those producing polymer chains with higher molecular weight and lower 1-Hexene content, and the MWD curve continuously inclined to the low molecular weight side. The active centers with higher 1-Hexene incorporation rate have relatively smaller rate constant of ethylene insertion. When [1-Hexene] was increased, the rate constant of ethylene insertion was only slightly changed, but the rate constant of 1-Hexene insertion was markedly lowered, meaning that the active centers revived by 1-Hexene have relatively lower ability of incorporating 1-Hexene.
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COPOLYMERIZATION OF ETHYLENE AND 1-Hexene WITH TiCl4/MgCl2 CATALYSTS MODIFIED BY 2,6-DIISOPROPYLPHENOL *
Chinese Journal of Polymer Science, 2012Co-Authors: Shengjie Xia, Xiao-yan Liu, Zhiqiang FanAbstract:A supported TiCl4/MgCl2 catalyst without internal electron donor (O-cat) was prepared firstly. Then it was modified by 2,6-diisopropylphenol to make a novel modified catalyst (M-cat). These two catalysts were used to catalyze ethylene/1-Hexene copolymerization and 1-Hexene homopolymerization. The influence of cocatalyst and hydrogen on the catalytic behavior of these two catalysts was investigated. In ethylene/1-Hexene copolymerization, the introduction of 2,6- i Pr2C6H3O- groups did not deactivate the supported TiCl4/MgCl2 catalyst. Although the 1-Hexene incorporation in ethylene/1-Hexene copolymer prepared by M-cat was lower than that prepared by O-cat, the composition distribution of the former was narrower than that of the latter. Methylaluminoxane (MAO) was a more effective activator for M-cat than triisobutylaluminium (TIBA). MAO led to higher yield and more uniform chain structure. In 1-Hexene homopolymerization, the presence of 2,6- i Pr2C6H3O- groups lowered the propagation rate constants. Two types of active centers with a chemically bonded 2,6- i Pr2C6H3O- group were proposed to explain the observed phenomena in M-cat.
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Study on 1-Hexene polymerization based on Ziegler-Natta catalysts with doped support
Chinese Journal of Polymer Science, 2004Co-Authors: Xue Jiang, Zhiqiang FanAbstract:A series of Ti/Mg supported catalysts are prepared by using ball-milled mixtures of MgCl 2 -ethanol adducts and NaCI as supports, and 1-Hexene polymerizations catalyzed by the novel catalysts are studied. It is found that the molecular weight distribution of poly(1-Hexene) becomes apparently narrower when catalysts with doped supports are used, indicating that changing the structure of the support is an effective way to regulate the active center distribution of heterogeneous Ziegler-Natta catalyst.
Sonia Loras - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Diethyl Carbonate and Methyl Isobutyl Ketone as Entrainers for the Separation of 1-Hexene and n-Hexane
Journal of Chemical & Engineering Data, 2017Co-Authors: Beatriz Marrufo, Jordi Pla-franco, Estela Lladosa, Sonia LorasAbstract:Diethyl carbonate and methyl isobutyl ketone are tested as possible entrainers for separating 1-Hexene and n-hexane by extractive distillation. For this purpose, isobaric vapor–liquid equilibrium (VLE) data at 100 kPa have been obtained for the two ternary systems formed by the two hydrocarbons and one of the selected solvents: 1-Hexene + n-hexane + diethyl carbonate and 1-Hexene + n-hexane + methyl isobutyl ketone. VLE data for the following constituent binary systems have also been determined: 1-Hexene + diethyl carbonate, n-hexane + diethyl carbonate, 1-Hexene + methyl isobutyl ketone, and finally n-hexane + methyl isobutyl ketone. All binary systems present moderate positive deviations from Raoult’s law, and neither binary systems nor ternary systems show an azeotrope. The local composition models Wilson, UNIQUAC, and NRTL have been used for correlating VLE data and evaluating solvent effects.
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Solvent Effects on Vapor–Liquid Equilibria of the Binary System 1-Hexene + n-Hexane
Journal of Chemical & Engineering Data, 2012Co-Authors: Beatriz Marrufo, Jordi Pla-franco, Ben Rigby, Sonia LorasAbstract:In order to study the separation of 1-Hexene and n-hexane, two solvents, 2-pentanol and ethyl-butyrate, are tested as possible entrainers for an extractive distillation. In this way, isobaric vapor–liquid equilibrium (VLE) data at 100 kPa have been measured for the two ternary systems formed by the initial mixture and one of the mentioned solvents: 1-Hexene + n-hexane + ethyl butyrate and 1-Hexene + n-hexane + 2-pentanol. VLE data for the four constituent binary systems have also been measured. These systems are 1-Hexene + ethyl butyrate, n-hexane + ethyl butyrate, 1-Hexene + 2-pentanol, and finally n-hexane + 2-pentanol. All binary systems show moderate positive deviations from the ideal behavior and do not form an azeotrope. The well-known local composition models Wilson, UNIQUAC, and NRTL have been used for correlating VLE data. Prediction with the UNIFAC method has been also obtained.
