The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Baoquan Zhang - One of the best experts on this subject based on the ideXlab platform.
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liquid Hydrocarbon Fuels from catalytic cracking of rubber seed oil using usy as catalyst
Fuel, 2014Co-Authors: Kejing Quan, Shiwei Liu, Fusheng Liu, Congxia Xie, Baoquan ZhangAbstract:Abstract The catalytic cracking of rubber seed oil (RSO) to produce liquid Hydrocarbon Fuels using USY (ultrastable Y zeolite) as a heterogeneous catalyst has been studied. Under the optimum cracking conditions of RSO 10 g, m(USY)/m(RSO) = 1:50, and 420 °C for 90 min, the yield of liquid product reached 75.6%, and the chemical composition and properties of the liquid fuel were similar to those of gasoline-based Fuels (C8–C9 content >70%, low acid value, good cold-flow properties, and high calorific value). The stability of USY has been studied, and the results showed that it could be reused with negligible loss of activity over at least six cycles. USY appears to be a suitable heterogeneous catalyst for the production of liquid Hydrocarbon Fuels from RSO.
Ronald K Hanson - One of the best experts on this subject based on the ideXlab platform.
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a new strategy of characterizing Hydrocarbon Fuels using ftir spectra and generalized linear model with grouped lasso regularization
Fuel, 2021Co-Authors: Yu Wang, Wei Wei, Yue Zhang, Ronald K HansonAbstract:Abstract In previous studies, we have shown that gas-phase mid-infrared spectra can be used to estimate the properties of Hydrocarbon Fuels. Specifically, the spectrum around 3.4 μm and regularized linear models were utilized to estimate various physical and chemical properties of Hydrocarbon Fuels. In this study, we use a generalized linear model with grouped-Lasso regularization to characterize the average fuel structure in terms of the fractions of each functional group type and provide a new strategy to approach the property estimation problem. The robustness of this structure characterization method against low spectral resolution and high multiplicative noise in FTIR spectra are studied and presented. Two property estimation models, i.e. a linear and a nonlinear additive model, are presented as demonstrations of estimating properties from functional group numbers.
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on estimating physical and chemical properties of Hydrocarbon Fuels using mid infrared ftir spectra and regularized linear models
Fuel, 2019Co-Authors: Yu Wang, David F Davidson, Yiming Ding, Wei Wei, Yi Cao, Ronald K HansonAbstract:Abstract The concept of a compact, economical FTIR-based analyzer for estimating the properties of Hydrocarbon Fuels with small amounts of fuel is proposed. The high correlations between mid-IR FTIR absorption spectra of fuel vapor in the range 3300–3550 nm and 15 physical and chemical properties, such as density, initial boiling point, surface tension, kinematic viscosity, number of carbon and hydrogen per average molecule, and derived cetane number, for 64 Hydrocarbon Fuels are demonstrated. Lasso-regularized linear models based on linear combination of absorption cross sections at selected wavelengths are built for each of these physical and chemical properties, yielding accurate estimations.
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a new method of estimating derived cetane number for Hydrocarbon Fuels
Fuel, 2019Co-Authors: Yu Wang, David F Davidson, Ronald K HansonAbstract:Abstract A new spectroscopic predictor for estimating ignition characteristics including derived cetane number is proposed for Hydrocarbon Fuels. This spectroscopic predictor is the ratio of room temperature absorbance of unreacted fuel vapor at 3.41 and 3.39 μ m, termed here as the “3.41/3.39 absorption ratio.” Its wide availability and applicability are demonstrated for a range of pure Hydrocarbons, mixtures of pure Hydrocarbons, and distillate and synthetic jet Fuels. Quasi-linear calculation methods are provided for practical use. Spectroscopic and kinetic interpretations are provided based on the fraction of –CH2– hydrogen relative to all carbon-bonded hydrogen. In addition, the correlations between the proposed predictor and ignition delay time and C2H4 yield are presented and discussed to exhibit the predictor’s potential as a fuel screening tool.
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mid infrared absorption measurements of liquid Hydrocarbon Fuels near
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: Jason M Porter, Jay B Jeffries, Ronald K HansonAbstract:Abstract Quantitative absorption spectra for several Hydrocarbon Fuels in the liquid phase at 27 ∘ C are presented. Measurements of toluene, n-dodecane, n-decane, and three samples of gasoline were made over the spectral region 2700–3200 cm - 1 to support the development of mid-infrared laser-absorption diagnostics for measurements of fuel vapor in the presence of liquid films and aerosols. A procedure for quantitative Fourier transform infrared (FTIR) absorption measurements of strongly absorbing liquids is described and the resulting absorption spectra are compared with previously measured absorption spectra in the vapor phase. The measured absorption spectra for liquid gasoline are shown to scale with the volume percent of olefin, alkane, and aromatic Hydrocarbons in each sample. Finally, the observed frequency shift of ∼ 8 cm - 1 in the spectra of vapor and liquid Hydrocarbons is discussed, including the potential for measurements of fuel vapor in the presence of liquid films.
Li Jiang - One of the best experts on this subject based on the ideXlab platform.
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Review on the catalytic pyrolysis of waste oil for the production of renewable Hydrocarbon Fuels
Fuel, 2021Co-Authors: Wang Yunpu, Qi Yang, Yujie Peng, Yuhuan Liu, Wu Qiuhao, Xiaojie Tian, Leilei Dai, Roger Ruan, Li JiangAbstract:Abstract The deterioration of environment and the depletion of fossil Fuels have inspired the exploration for alternative Fuels based on renewable raw materials. This review presented the catalytic pyrolysis of waste oil for producing renewable Hydrocarbon Fuels. After the discussion of various process parameters, including waste oil characteristics, microwave absorbents, co-pyrolysis technology, catalysts, and reactor types, the best conditions for improving the yield and quality of Hydrocarbon Fuels were obtained. The advantages and limitations of microwave-assisted pyrolysis and conventional electric heating were discussed. Microwave-assisted pyrolysis is a relatively new technology compared with traditional electric heating pyrolysis, which has great development potential. In the future, the catalysts with low pressure drop and coking rate need to be developed and their microwave absorption characteristics in microwave-assisted pyrolysis must be fully investigated. Simultaneously, a continuous microwave-assisted pyrolysis system needs to be constructed to achieve the large-scale production of renewable Hydrocarbon Fuels from waste oil.
Wenjun Fang - One of the best experts on this subject based on the ideXlab platform.
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A Polyester-Based Initiation Strategy for Achieving High-Efficient Cracking of Hydrocarbon Fuels
Chemical Engineering Journal, 2020Co-Authors: Shuaishuai Bai, Lu Zhao, Yongsheng Guo, Hujun Xie, Wenjun FangAbstract:Abstract Active cooling of scramjets by endothermic Hydrocarbon Fuels is considered as an effective approach to addressing the thermal problem for hypersonic aircrafts. Herein, to accelerate the endothermic cracking reactions of these Fuels for a better cooling capability, a novel strategy for Hydrocarbon cracking using a polyester-based macromolecule as macromolecular initiator (MI) is designed. The results clarify that the MI features high-efficient thermal cracking of Hydrocarbon Fuels in a tubular reactor with an improved conversion ratio, gas yield, and alkene selectivity. The possible mechanism behind the macromolecular initiator is revealed by intermediate analyses and density functional theory (DFT) calculations, which show the radical fragments from MI decomposition are effective in accelerating JP-10 dehydrogenation. The successful implementation of polymer materials in Hydrocarbon Fuels holds immense promise for the optimal use of Hydrocarbon Fuels in hypersonic aircrafts.
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Strategically designed macromolecules as additives for high energy-density Hydrocarbon Fuels
Fuel, 2020Co-Authors: Yitong Dai, Yongsheng Guo, Hujun Xie, Haiyun Sun, Wenjun FangAbstract:Abstract To improve oxidative stability and heat sink of Hydrocarbon Fuels, a series of versatile macromolecular additives, BHPEI and CBHPEI, were synthesized by modification of hyperbranched poly(ethyleneimine) (HPEI). These macromolecules were used as circumstance-dependent additives in JP-10, a high energy–density Hydrocarbon fuel. Each strategically designed macromolecule serves not only as a radical scavenger to improve the thermal-oxidative stability of Hydrocarbon Fuels at relatively low temperature, but also as a cracking initiator for heat sink enhancement as the temperature rises. According to the ASTM E1858, with the addition of BHPEI-10K at 500 ppm, the oxidation induction time of JP-10 under 175 °C could increase from 9.3 min to 14.8 min. The insoluble deposits could be reduced by 73% with the addition of 500 ppm BHPEI-10K according to accelerated oxidation tests. The superior antioxidation capability of macromolecular antioxidants were further elucidated by density functional theory (DFT) calculations. Furthermore, the BHPEI-10K performed decently as a macromolecular initiator for supercritical cracking of JP-10, with a dosage of 0.1 wt%, the conversion of JP-10 at 675 °C can be elevated from 16.4% to 33.4% and the corresponding heat sink can be improved from 1.98 MJ/kg to 2.15 MJ/kg.
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Solubilization of the macroinitiator palmitoyl modified hyperbranched polyglycerol (PHPG) in Hydrocarbon Fuels
Fuel, 2017Co-Authors: Yanyu Shen, Lifeng Zhang, Guo Yongsheng, Dionysios D. Dionysiou, Wenjun FangAbstract:Abstract Palmitoyl-modified hyperbranched polyglycerol (PHPG), has been developed as a kind of “macroinitiator” for improving the endothermic capability of Hydrocarbon Fuels. As the solubilization of the macroinitiator in Hydrocarbon Fuels is essential to its application in practical operations, the solubility of PHPG in a series of n -alkane is evaluated theoretically via the change of Gibbs free energy in the mixing process, and is verified experimentally by the tests on the transmittance with a UV–vis spectrophotometer. The dissolution-aggregation behavior of PHPG with different molecular weights in tridecane solutions is investigated by the dynamic laser scattering (DLS) technique. n -Alcohols are applied as co-surfactants to improve the solubility of PHPG in Hydrocarbon Fuels. The upper critical solution temperatures (UCST) of PHPG in tridecane with the addition of alcohols are successfully lowered, and the particle sizes detected by DLS are much lower than those without alcohols. Then, the endothermic capabilities of a series of tridecane-based Fuels under supercritical conditions (3.5 MPa, and 600–720 °C) are investigated in a tube reactor which is heated by a direct current. The conversion, gas yield and heat sink of each fuel in the cracking process are obtained. It is showed that the PHPG can initiate the cracking of Hydrocarbon Fuels and enhance their endothermic capability significantly. With the addition of alcohols, not only the solubility of PHPG in Hydrocarbon Fuels is improved significantly, but also the heat sink of Hydrocarbons is further raised to a higher value.
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Impacts of hydrogen to carbon ratio (H/C) on fundamental properties and supercritical cracking performance of Hydrocarbon Fuels
Chemical Engineering Journal, 2016Co-Authors: Lei Yue, Yongsheng Guo, Wenjun FangAbstract:Abstract The precise investigations on modeling properties and performance of practical Fuels are usually complicated because of the multi-component nature. On the basis of hydrogen to carbon ratio (H/C), as a simple and overall characterization parameter for Hydrocarbon Fuels, this work provides a comprehensive insight into the study of kerosene-based Hydrocarbon Fuels (H/C = 1.6–2.3). The fundamental properties and supercritical cracking performance of Hydrocarbon Fuels are influenced intrinsically by their H/C values and molecular weights (M) due to the compositional and structural effects. Thus, a new combined parameter, (H/C)/Ma, is proposed to model the performance of Hydrocarbon Fuels. It is found that the Hydrocarbon fuel with a higher H/C has a higher net heating value, and that with a higher (H/C)/M0.1 has a lower density. The viscosity decreases with the increase of (H/C)/M0.5. The flash point shows a decreasing trend against the increase of (H/C)/M2. The densities, viscosities and net heating values of 23 Hydrocarbon Fuels are calculated by means of the regression equations with the H/C and M data, and they are in agreement with the corresponding experimental values with the relative errors less than 2.5%, 10% and 1.5%, respectively. As investigated in an electrically heated tube reactor, the Hydrocarbon fuel with a higher H/C performs thermal cracking more easily, absorb more heat and form fewer cokes. As a result, the cracking performance of Hydrocarbon Fuels can be predicted reasonably to a certain extent on the basis of H/C values.
Kejing Quan - One of the best experts on this subject based on the ideXlab platform.
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liquid Hydrocarbon Fuels from catalytic cracking of rubber seed oil using usy as catalyst
Fuel, 2014Co-Authors: Kejing Quan, Shiwei Liu, Fusheng Liu, Congxia Xie, Baoquan ZhangAbstract:Abstract The catalytic cracking of rubber seed oil (RSO) to produce liquid Hydrocarbon Fuels using USY (ultrastable Y zeolite) as a heterogeneous catalyst has been studied. Under the optimum cracking conditions of RSO 10 g, m(USY)/m(RSO) = 1:50, and 420 °C for 90 min, the yield of liquid product reached 75.6%, and the chemical composition and properties of the liquid fuel were similar to those of gasoline-based Fuels (C8–C9 content >70%, low acid value, good cold-flow properties, and high calorific value). The stability of USY has been studied, and the results showed that it could be reused with negligible loss of activity over at least six cycles. USY appears to be a suitable heterogeneous catalyst for the production of liquid Hydrocarbon Fuels from RSO.