JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yundi Huang,Fashe Li,Guirong Bao,Wenchao Wang,Hua Wang
Composition and kinematic viscosities of 16 biodiesels and 55 FAME–FAME binary blends were measured by following EN 14103 and ASTM D 445–88 standards. The effects of composition and temperature on viscosity were assessed, and two correlations are proposed to predict the viscosity of biodiesels. One correlation is derived through the MLR method for kinematic viscosity–composition relationship at 40 °C, giving a correlation coefficient of 0.996, and compared with well-known models previously reported in the literature. The AARD of predictions is 1.69%. The second composition-temperature-dependent viscosity correlation is achieved by Arrhenius kinetics evaluated with the Chavarria-Hernandez method against the viscosity data measured by Freitas. A global AARD of 0.94% is obtained.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Guanjia Zhao,Zemin Yuan,Jianguo Yin,Suxia Ma
For the investigation of injection characteristics of fuels in the internal combustion engines or turbines, thermophysical properties like liquid kinematic viscosity, surface tension, density, and refractive index are crucial and necessary. In this work, the liquid kinematic viscosity and surface tension were measured by surface light scattering (SLS) for the binary and ternary mixtures of n-dodecane with methyl butyrate and methyl decanoate, respectively, in the temperature ranges from (308.15 to 413.15) K for the mixtures and (298.15 to 423.15) K for methyl butyrate. Additionally, the liquid density was determined by a U-tube densimeter from (293.15 to 423.15) K, and refractive index was measured from (278.15 and 358.15) K. Furthermore, the experimental data of surface tension and kinematic viscosity for the mixtures were correlated with two proposed equations against the temperatures and mole fractions. The density and refractive index data were correlated by polynomial functions. This work provides essential data and correlation models for the crucial thermophysical properties of the binary model fuels for the bio-aviation kerosene in connection with the investigation of the fuel injection and combustion system.
研究领域:
能源科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yuzeng Zheng,Fashe Li,Huicong Zhang,Shuang Wang,Zhongjin Zhao,Wenchao Wang,Renyi Chen
The effects of light, ventilation and antioxidant on biodiesel performance and the corresponding influence mechanisms are investigated during long-term storage. The biodiesel exhibits slow autoxidation and its physical/chemical properties change during storage. Light and ventilation conditions can accelerate the oxidation of biodiesel, thereby aggravating its degradation. During the autoxidation process of biodiesel, the grinding spot diameter firstly decreases from 165.01 μm to 131.45 μm and then increases to 362.5 μm, similar to the shape of a fishhook. During the initial storage stage, the fatty acid methyl ester in biodiesel is decomposed into carboxylic acid and small molecular substances such as aldehydes and ketones, thereby improving the lubricity of biodiesel and reducing the grinding spot diameter. After long-term storage, insoluble resins and sediments are generated, causing an increase in the grinding spot diameter. Specifically, the kinematic viscosity of biodiesel is increased to 4.407 mm 2 /s even under dark and sealed storage conditions.
研究领域:
化学工程
·
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2019
·
IF 2.514
Guanjia Zhao,Xiaona Liu,Zemin Yuan,Jianguo Yin,Suxia Ma
To facilitate the application of clean alternative fuels or fuel additives in compression ignition engines and a better understanding of the characteristics of their combustion and emission, physical biofuel surrogates are necessary to be proposed in computation and the knowledge of their thermophysical properties, such as liquid density, surface tension and viscosity, are also crucial for the design and optimization of the fuel injection system. Therefore, the surface light scattering (SLS) method was adopted for the simultaneous determination of the liquid surface tension and kinematic viscosity of the binary mixtures containing n-hexadecane, methyl butyrate and methyl decanoate in the temperature range between (353.15 and 423.15) K in the present work. Additionally, a U-tube densimeter and refractometer were used to obtain the liquid density and refractive index of the binary mixtures in the temperature range from (293.15–423.15) K and (293.15–358.15) K, respectively. Correlations for all thermophysical properties against temperature and mole fraction were also proposed. The relative deviations of liquid density, refractive index, kinematic viscosity as well as surface tension data from those calculated by the proposed equations were within ±0.3%, ±0.20%, ±2% and ±1%, respectively for the binary systems.
研究领域:
能源科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Guanjia Zhao,Zemin Yuan,Xiaona Liu,Penglai Wang,Jianguo Yin,Suxia Ma
The thermophysical properties of biodiesel surrogates are of great importance for the development of the new and clean fuel substitutes or additives. Experimental investigation and molecular dynamic simulation of the related thermophysical properties such as the liquid density, kinematic viscosity and surface tension over a sufficient wide temperature range will facilitate the corresponding researches of selecting the proper fuel surrogates and designing the spray system of the internal combustion engine . Therefore, the present study investigated liquid surface tension and kinematic viscosity of the proposed physical biodiesel surrogates of n-hexadecane with ethyl hexanoate and ethyl heptanoate by the surface light scattering method at three mole fractions (0.25, 0.50 and 0.75) over the temperature range from (353.15 to 433.15) K. Additionally, the liquid density was also determined by a U-tube densimeter in the temperature range between (293.15 and 433.15) K. Meanwhile, three force fields including OPLS-AA, GROMOS and AMBER were selected and validated with n-hexadecane and ethyl heptanoate in a wide temperature range and the GROMOS force field was demonstrated to be the best one for the description of the three thermophysical properties of the two fluids. A further molecular dynamic simulation with GROMOS force field was applied to the proposed binary surrogates of n-hexadecane with ethyl hexanoate and ethyl heptanoate, and the results for the three properties agreed well with their experimental values over the entire temperature range.
研究领域:
能源科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Xiaojie Wang,Xiaopo Wang,Dongbo Wang
Densities and kinematic viscosities of binary mixtures for ethyl caprate with 1-propanol, 1-butanol, and 1-pentanol were measured at temperatures from 283.15 K to 318.15 K and at ambient pressure (0.1 MPa) over the entire composition range. Excess molar volumes and viscosity deviations of the mixtures were derived from the experimental data and correlated using the Redlich–Kister equation. In addition, viscosities were correlated using the McAllister three-body model, whereas densities were fitted to a third-order polynomial as a function of temperature and mole fraction.
研究领域:
物理化学
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热力学
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流体力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Guanjia Zhao,Zemin Yuan,Mingjing Fan,Jianguo Yin,Suxia Ma
In present study, surface light scattering (SLS) was used for the simultaneous determination of liquid surface tension and kinematic viscosity of the binary and ternary mixtures of three fatty acid ethyl esters (FAEEs) and n-dodecane. The SLS apparatus was firstly checked with n-dodecane and a good agreement between our data and those from literatures could be found. By utilizing this apparatus, both properties were investigated in the temperature ranges between (308 and 413) K. Additionally, the liquid density and refractive index were determined by a densimeter between (293 and 423) K and a refractometer from (278 to 358) K, respectively. The thermophysical property data obtained in this study were correlated as polynomial equations of temperature and mole fraction of the pure components. This work provided the crucial thermophysical properties and the corresponding models in connection with the application in the design and optimization of the injection system of internal combustion engine (ICE).
研究领域:
热力学
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化学工程
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材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5583-5601
·
IF 3.917
Zhang Linya,Xue Wei,Gu Limin
Abstract The paper presented a new, non-pollution macromolecule of adsorbing acid dyes, and developed the adsorption mechanism on the basis of effect between the modified groups of hyperbranched hemicellulose polymer and acid dyes. The modified hyperbranched hemicellulose polymer (HHP) with a large number of terminal carboxyl groups and hydroxyl groups was synthesized by hemicellulose maleate and dihydroxymethyl propionic acid. The degree of substitution, kinematic viscosity and thermal stability of HHP was determined. In SEM images, the HHP exhibited the pores and cross-linked structure which were good help for dye adsorption. When the HHP was applied in adsorbing Methyl red dye, Bromocresol green dye and Bromophenol blue dye, it exhibited higher adsorption capacity. The adsorption capacity changed with different adsorbent dosage, pH, temperature and ionic strength, and the optimal adsorption capacity for Methyl red dye, Bromocresol green dye and Bromophenol blue dye could reach 825 mg/g, 675 mg/g and 912 mg/g respectively. The adsorption mechanism, adsorption isotherm and adsorption diffusion mode were demonstrated by Pseudo-order model, Langmuir model, Intraparticle diffusion model and Memberance diffusion model respectively. The adsorption data possessed better correlation with Pseudo-second-order model, Langmuir model and Intraparticle diffusion model. The adsorption isotherms and thermodynamic date indicated the processes of HPP2 adsorbing three acid dyes were endothermic. The N 2 -adsorption/desorption isotherms of HPP2 revealed the hyperbranched hemicellulose polymer filled the pore in clusters, and its adsorption process met with monolayer adsorption. Graphical abstract
研究领域:
环境科学
·
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）