The Experts below are selected from a list of 495 Experts worldwide ranked by ideXlab platform
Wenjun Fang - One of the best experts on this subject based on the ideXlab platform.
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density and viscosity of ternary mixture of Cyclopentanol exo tetrahydrodicyclopentadiene 1 3 dimethyladamantane
Journal of Chemical & Engineering Data, 2019Co-Authors: Lu Zhao, Yongsheng Guo, Wenjun FangAbstract:Oxygenated additives have been proved to improve the property of an aviation fuel, such as reducing pernicious emissions and adjusting physical properties, and an appropriate alcohol is usually a typical candidate. To understand the properties of high-energy-density hydrocarbon fuels with alcohol, densities (ρ) and viscosities (η) of ternary system, Cyclopentanol + exo-tetrahydrodicyclopentadiene (JP-10) + 1,3-dimethyladamantane (1,3-DMA), and their corresponding binary systems, have been determined over the whole composition range at different temperatures, T = (293.15–333.15) K, and atmospheric pressure, p = 0.1 MPa. The excess molar volumes (VmE) and the viscosity deviations (Δη) of the binary systems mixtures were calculated and fitted to the Redlich–Kister equation, while those of the ternary systems were calculated and fitted to four different semiempirical equations. The results show that the addition of Cyclopentanol can lead to a little higher density and a lower viscosity, which are beneficial t...
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densities and viscosities for the ternary system of decalin methylcyclohexane Cyclopentanol and corresponding binaries at t 293 15 to 343 15 k
Journal of Chemical & Engineering Data, 2019Co-Authors: Xiaoyi Chen, Shenda Jin, Yitong Dai, Yongsheng Guo, Qunfang Lei, Wenjun FangAbstract:Densities (ρ) and viscosities (η) for the ternary system of decalin (1) + methylcyclohexane (2) + Cyclopentanol (3) and three corresponding binary systems have been measured over the whole composition range at 11 temperature points from 293.15 K to 343.15 K under atmospheric pressure (0.1 MPa). The excess molar volumes (VmE) and viscosity deviations (Δη) of binary systems have been calculated and further fitted with the Redlich–Kister equation, while corresponding physical data of the ternary system have been correlated via the Clibuka, Singh, Nagata-Tamura, and Redlich–Kister equations. The VmE values are negative for the binary system of decalin (1) + methylcyclohexane (2) with a minimum when the moles of the two components are similar. For the system of decalin (1) + Cyclopentanol (2), the VmE values are always positive with a maximun at about x1 = 0.6. At the same time, a sigmoid curve can be observed for the system of methylcyclohexane (1) + Cyclopentanol (2). The minimum and maximum appear around x1...
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Densities and Viscosities for the Ternary System of Decalin + Methylcyclohexane + Cyclopentanol and Corresponding Binaries at T = 293.15 to 343.15 K
2019Co-Authors: Xiaoyi Chen, Shenda Jin, Yitong Dai, Yongsheng Guo, Qunfang Lei, Wenjun FangAbstract:Densities (ρ) and viscosities (η) for the ternary system of decalin (1) + methylcyclohexane (2) + Cyclopentanol (3) and three corresponding binary systems have been measured over the whole composition range at 11 temperature points from 293.15 K to 343.15 K under atmospheric pressure (0.1 MPa). The excess molar volumes (VmE) and viscosity deviations (Δη) of binary systems have been calculated and further fitted with the Redlich–Kister equation, while corresponding physical data of the ternary system have been correlated via the Clibuka, Singh, Nagata-Tamura, and Redlich–Kister equations. The VmE values are negative for the binary system of decalin (1) + methylcyclohexane (2) with a minimum when the moles of the two components are similar. For the system of decalin (1) + Cyclopentanol (2), the VmE values are always positive with a maximun at about x1 = 0.6. At the same time, a sigmoid curve can be observed for the system of methylcyclohexane (1) + Cyclopentanol (2). The minimum and maximum appear around x1 = 0.2 and x1 = 0.9, respectively. The Δη values of the three binary systems are all negative and the absolute values decrease with increase in temperature. For the ternary system, the VmE values are partially negative and the Δη values are negative over the entire concentration range. The nonideal behaviors of the mixtures are discussed in the perspective of intermolecular interaction and structural effect
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Density and Viscosity of Ternary Mixture of Cyclopentanol + exo-Tetrahydrodicyclopentadiene + 1,3-Dimethyladamantane
2019Co-Authors: Lu Zhao, Yongsheng Guo, Wenjun FangAbstract:Oxygenated additives have been proved to improve the property of an aviation fuel, such as reducing pernicious emissions and adjusting physical properties, and an appropriate alcohol is usually a typical candidate. To understand the properties of high-energy-density hydrocarbon fuels with alcohol, densities (ρ) and viscosities (η) of ternary system, Cyclopentanol + exo-tetrahydrodicyclopentadiene (JP-10) + 1,3-dimethyladamantane (1,3-DMA), and their corresponding binary systems, have been determined over the whole composition range at different temperatures, T = (293.15–333.15) K, and atmospheric pressure, p = 0.1 MPa. The excess molar volumes (VmE) and the viscosity deviations (Δη) of the binary systems mixtures were calculated and fitted to the Redlich–Kister equation, while those of the ternary systems were calculated and fitted to four different semiempirical equations. The results show that the addition of Cyclopentanol can lead to a little higher density and a lower viscosity, which are beneficial to the design and performance of hydrocarbon fuels
Tao Zhang - One of the best experts on this subject based on the ideXlab platform.
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synthesis of high density aviation fuel with Cyclopentanol
ACS Sustainable Chemistry & Engineering, 2016Co-Authors: Fang Chen, Xiaofeng Yang, Wentao Wang, Aiqin Wang, Yu Cong, Xiaodong Wang, Tao ZhangAbstract:Decalin is the main component of JP-900, a thermally stable and high-energy density jet fuel. Decalin is also an important component of advanced jet fuels. Cyclopentanol is a platform compound that can be derived from lignocellulose. In this work, a mixture of C10 and C15 polycycloalkanes (with decalin as the major component) was first synthesized by the oligomerization/rearrangement of cyclopentene from the dehydration of Cyclopentanol, followed by hydrogenation. Among the investigated catalysts, Amberlyst-36 resin demonstrated the highest activity and excellent stability for Cyclopentanol dehydration and cyclopentene oligomerization/rearrangement. The influences of reaction temperature and reaction time on the catalytic performances of Amberlyst-36 resin for both reactions were investigated. Under the optimum conditions, 84.0% carbon yield of cyclopentene was obtained from Cyclopentanol dehydration, and 74.2% carbon yield of C10 and C15 polycycloalkenes was achieved by the oligomerization/rearrangement ...
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synthesis of high density aviation fuel with Cyclopentanol derived from lignocellulose
Scientific Reports, 2015Co-Authors: Xueru Sheng, Wentao Wang, Aiqin Wang, Yu Cong, Xiaodong Wang, Jinfan Yang, Tao ZhangAbstract:For the first time, renewable high density aviation fuels were synthesized at high overall yield (95.6%) by the Guerbet reaction of Cyclopentanol which can be derived from lignocellulose, followed by the hydrodeoxygenation (HDO). The solvent-free Guerbet reaction of Cyclopentanol was carried out under the co-catalysis of solid bases and Raney metals. Among the investigated catalyst systems, the combinations of magnesium-aluminium hydrotalcite (MgAl-HT) and Raney Ni (or Raney Co) exhibited the best performances. Over them, high carbon yield (96.7%) of C10 and C15 oxygenates was achieved. The Guerbet reaction products were further hydrodeoxygenated to bi(cyclopentane) and tri(cyclopentane) over a series of Ni catalysts. These alkanes have high densities (0.86 g mL−1 and 0.91 g mL−1) and can be used as high density aviation fuels or additives to bio-jet fuel. Among the investigated HDO catalysts, the 35 wt.% Ni-SiO2-DP prepared by deposition-precipitation method exhibited the highest activity.
Nitin V. Bhate - One of the best experts on this subject based on the ideXlab platform.
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Measurement and Correlation of Isobaric Vapor Liquid Equilibrium Data for Cyclopentyl Methyl Ether and Cyclopentanol
Journal of Chemical & Engineering Data, 2019Co-Authors: Akash Patel, Chintan Modi, M.h. Joshipura, Nitin V. BhateAbstract:Isobaric vapor–liquid equilibrium data for pure components cyclopentyl methyl ether (CPME) and Cyclopentanol (CP) and their binary mixtures was generated using a modified ebulliometer. This data has been reported for five different pressures in the range of 71.50 to 101.79 kPa. Pure component boiling points were correlated using the Antoine equation and compared with the literature data. Binary vapor–liquid equilibrium data was modeled using Wilson, NRTL, and UNIQUAC models. Deviation plots for experimental and predicted temperatures are given. UNIQUAC and NRTL model predictions showed a better fit with the experimental values relative to the Wilson model.
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Measurement and Correlation of Isobaric Vapor Liquid Equilibrium Data for Cyclopentyl Methyl Ether and Cyclopentanol
2019Co-Authors: Akash Patel, Chintan Modi, M.h. Joshipura, Nitin V. BhateAbstract:Isobaric vapor–liquid equilibrium data for pure components cyclopentyl methyl ether (CPME) and Cyclopentanol (CP) and their binary mixtures was generated using a modified ebulliometer. This data has been reported for five different pressures in the range of 71.50 to 101.79 kPa. Pure component boiling points were correlated using the Antoine equation and compared with the literature data. Binary vapor–liquid equilibrium data was modeled using Wilson, NRTL, and UNIQUAC models. Deviation plots for experimental and predicted temperatures are given. UNIQUAC and NRTL model predictions showed a better fit with the experimental values relative to the Wilson model
Heinz Pitsch - One of the best experts on this subject based on the ideXlab platform.
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exploring the combustion chemistry of a novel lignocellulose derived biofuel Cyclopentanol part ii experiment model validation and functional group analysis
Combustion and Flame, 2019Co-Authors: Liming Cai, Heiko Minwegen, Stephan Kruse, Rene Daniel Buttgen, Raik Hesse, Ajoy Ramalingam, Joachim Beeckmann, Kai Leonhard, Alexander K Heufer, Heinz PitschAbstract:Abstract In part I of this paper, the reaction kinetics and thermochemistry of Cyclopentanol have been studied numerically. In this part, the ignition and combustion behavior of Cyclopentanol are studied experimentally in a shock tube, a rapid compression machine, a combustion vessel, and a counterflow burner. Fundamental combustion properties, such as ignition delay times, laminar flame speeds, and extinction strain rates, are reported. All measurements probe a variety of initial conditions and provide an initial evaluation of the performance of Cyclopentanol under different combustion modes. The experimental results are compared with those computed using the chemical mechanism presented in Part I. Reasonable agreement is observed. The controlling kinetics of Cyclopentanol oxidation is explored considering various combustion modes. Moreover, Cyclopentanol is compared to a variety of C5 fuels including cyclopentane, n-pentanol, and n-pentane with respect to their combustion characteristics in order to evaluate the impact of functional groups. The auto-ignition propensity of Cyclopentanol is found to be lower than that of its paraffinic and linear counterparts, while the premixed flames of all these fuels propagate with approximately identical velocities at the investigated conditions.
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exploring the combustion chemistry of a novel lignocellulose derived biofuel Cyclopentanol part i quantum chemistry calculation and kinetic modeling
Combustion and Flame, 2019Co-Authors: Liming Cai, Kai Leonhard, Leif C Kroger, Malte Dontgen, Krithika Narayanaswamy, Mani S Sarathy, Karl Alexander Heufer, Heinz PitschAbstract:Abstract Biomass derived chemicals may offer sustainable alternatives to petroleum derived hydrocarbons, while also enhancing engine combustion performance with co-optimization of fuels and engines. This paper presents a numerical study on the oxidation and combustion of a novel biofuel compound, Cyclopentanol. Its reaction kinetics and thermochemistry are first explored using ab initio quantum chemistry methods. Thermochemical properties are calculated for Cyclopentanol and a set of its key oxidation intermediates. C-H bond dissociation energies of Cyclopentanol are computed for different carbon sites. For the fuel radicals, the energy barriers of their ring-opening reactions and the potential energy surfaces of their oxidation reactions are determined. Based on the theoretical results, a chemical kinetic mechanism is proposed to describe the oxidation of Cyclopentanol at low and high temperatures. The model is compared against data obtained from shock tube, rapid compression machine, combustion vessel, and counterflow burner experiments over a range of initial conditions. Furthermore, reaction pathway analysis is performed using the present mechanism to give insights into the underlying oxidation chemistry of Cyclopentanol. It is found that the α-radical of Cyclopentanol undergoes preferably an alcohol-specific HO2 elimination reaction to form stable cyclopentanone and this reaction can strongly retard reactivity. The major reaction pathways of β- and γ-radicals are similar to those of cyclopentyl radicals that are the sequential and formally direct reactions of fuel radicals with O2 to form cyclopentenols and HO2 radicals. The existence of the hydroxy moiety affects the bond dissociation energies and reaction barriers, slightly favoring the chain-branching channel for γ-radicals at low temperatures.
Takashi Tatsumi - One of the best experts on this subject based on the ideXlab platform.
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High selectivity of MCM-22 for Cyclopentanol formation in liquid-phase cyclopentene hydration
Journal of Catalysis, 2003Co-Authors: Duangamol Nuntasri, Takashi TatsumiAbstract:Highly effective formation of Cyclopentanol through the liquid-phase hydration of cyclopentene has been attempted on various zeolites catalysts. MCM-22 zeolite was the most selective catalyst, which actively converted cyclopentene to Cyclopentanol with a selectivity up to 99%. The effects on the hydration of catalyst preparation method, reaction atmosphere and temperature have been investigated for the MCM-22 catalysts. On the basis of the effect of reaction atmosphere, the mechanism of liquid-phase cyclopentene hydration was proposed. The thermodynamic equilibrium between cyclopentene and Cyclopentanol was suggested to control greatly the cyclopentene conversion. The cyclopentene conversion was increased to 10% by increasing the water/cyclopentene ratio. Poisoning using organic amines with different molecular sizes revealed that the hydration occurred mainly in the 10-membered ring channels of MWW structure, which had an elliptic aperture smaller than that of MFI structure, exhibiting a significant shape selectivity by suppressing the etherification Cyclopentanol.
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highly selective formation of Cyclopentanol through liquid phase cyclopentene hydration over mcm 22 catalysts
ChemInform, 2002Co-Authors: Duangamol Nuntasri, Takashi TatsumiAbstract:MCM-22 catalyst exhibits an extremely high shape selectivity not observed on other zeolites of MFI, MOR and BEA structures, in that it effectively catalyzes the liquid-phase hydration of cyclopentene at a conversion up to 10% and a Cyclopentanol selectivity as high as 99%.
