JOURNAL OF CHEMICAL THERMODYNAMICS
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2022
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IF 3.269
Ying Zhang,Songtao Cao,Yuqi Su,Maogang He
The mutual diffusion coefficients of ethanol + isooctane and n- butanol + isooctane mixtures were measured by digital holographic interferometry. The measurements were performed at atmospheric pressure with temperatures ranging from 288.15 K to 318.15 K and mass fractions ranging from 0.05 to 0.95, and the effects of changes in temperature and composition were discussed. Based on the local composition theory, a new model is proposed for predicting mutual diffusion coefficients. Modified from the Vignes model, this model can be used to predict the mutual diffusion coefficient in ideal or non-ideal mixtures within a given deviation range. A comparison of the prediction results for the new model and five other models shows that the new model is far superior to the Darken model and Vignes model, and also has some advantages over the other models.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
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IF 2.888
Taotao Zhan,Yuqi Su,Ying Zhang,Xiangyang Liu,Maogang He
The mutual diffusion coefficients of ethanol + n-heptane and diethyl carbonate (DEC) + n-heptane binary solutions were measured over the mass fraction from 0.05 to 0.95 at the pressure of 0.101 MPa, and at temperatures T = 288.15 K, 298.15 K, 308.15 K and 318.15 K. The expanded relative uncertainty ( k = 2) of the Mach-Zehnder digital holographic interferometry employed in the measurements was estimated to be less than 2.4% with the confidence level of 0.95. A semi-empirical correlation was used to fit the mutual diffusion coefficients as a function of concentration and temperature, which represents the experimental values with the absolute average relative deviations being 0.94% for ethanol + n-heptane and 0.90% for DEC + n-heptane. The temperature and concentration dependences of the mutual diffusion coefficients were investigated. The strongest non-ideal thermodynamic behaviors appear when the mass fraction of ethanol is within the limits of 0.45 to 0.65 or that of DEC is within the limits of 0.45 to 0.65. Besides, the mutual diffusion coefficients of ethanol + n-heptane and DEC + n-heptane binary solutions are found to be extremely sensitive to the solute concentration over the mass fraction of ethanol and DEC from 0.00 to 0.05, respectively.
研究领域:
物理化学
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热力学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
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2020
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IF 2.838
Junwei Cui,Shaomin Yan,Jiangtao Wu,Shengshan Bi
In this work, thermal and mutual diffusivity of n -heptane ( n -C 7 H 16 ) with dissolved carbon dioxide (CO 2 ) were simultaneously measured using dynamic light scattering (DLS) method from 298 to 473 K and saturation pressure up to 5.5 MPa. For this purpose, the DLS setup as well as temperature and pressure system were improved. Two hydrodynamic modes in connection with the statistical fluctuations of entropy and species were verified. The average expanded uncertainty of thermal and mutual diffusivity were 9.0% and 4.9% with a coverage factor of k = 2. The thermal and mutual diffusivity versus pressure under isothermal lines were briefly discussed and a comparison with literature was performed. The experimental thermal and mutual diffusivity measured in this work are in reasonable agreement with the literature data. This work is expected to provide fundamental data for engineering process .
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
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IF 3.178
Yuqi Su,Songtao Cao,Taotao Zhan,Maogang He,Ying Zhang
The mutual diffusion coefficients of dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary systems were measured at temperatures from 288.15 K to 318.15 K with the mass fraction of dimethyl carbonate from 0.05 to 0.95 under atmospheric pressure. All the mutual diffusion coefficients we reported are Fick diffusion coefficients, which were measured by the digital holographic interferometry. The expanded relative uncertainty for the measured mutual diffusion coefficients is estimated to 2.4% with the level of confidence of 0.95 (coverage factor k = 2). Moreover, a theoretical model (UNIDIF) of mutual diffusion coefficients for dimethyl carbonate + n -heptane and dimethyl carbonate + isooctane binary mixtures was given by fitting the experimental results, and the adjustable parameters and infinite dilution diffusion coefficients of these two solutions were given. The influences of temperature and composition on the mutual diffusion coefficients were discussed.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2017
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IF 2.726
Ying Zhang,Xinxin He,Yutian Chen,Maogang He
The mutual diffusion coefficients of n -butanol + n -heptane and n -pentanol + n -heptane were measured over the mass fraction of n -butanol or n -pentanol from 0.05 to 0.95 at intervals of 0.10 and the temperatures 288.15 K, 298.15 K, 308.15 K and 318.15 K at 0.101 MPa. The measurements were carried out using a digital holographic interferometry system. The expanded relative uncertainty of the mutual diffusion coefficients was estimated to be less than 2.4%. The influences of temperature and composition on the mutual diffusion coefficients were investigated. Moreover, equations for the mutual diffusion coefficients of the two binary mixtures were fitted to the data as functions of mass fraction and temperature. The correlations represent the data with the absolute average of relative deviations (AARDs) of 1.1% for n -butanol + n -heptane and 0.77% for n -pentanol + n -heptane, respectively.
研究领域:
物理化学
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热力学
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传递现象
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溶液化学
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流体混合物
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
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2015
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IF 2.184
Sanguo Peng,Shi Zhang,Ying Zhang,Xiangyang Liu,Maogang He
Mutual diffusion coefficients of several short chain alcohols (ethanol, n -propanol and n -butanol) + n -octane mixtures in the temperature range from 283.2 K to 313.2 K at different concentrations were measured using holographic interferometry. The relation between the mutual diffusion coefficient with temperature, viscosity, concentration and molecular weight is investigated, respectively. The Onsager–Fuoss model is applied to analyse the various influence factors. A new correlation taking into account the effect of the temperature and concentration on the mutual diffusion coefficient is proposed to fit well the experimental data.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2023
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IF 2.6
Weijie Jia,Yuqi Su,Songtao Cao,Ao Dong,Ying Zhang,Maogang He
Mutual diffusion coefficients of three alkanes (n-heptane, n-octane and isooctane) in cyclohexane were measured by digital holographic interferometry under atmospheric pressure. The measured temperature points were 288.15 K, 298.15 K and 308.15 K, respectively and the mass fraction of the measured solution range was from 0.05 to 0.95. The extended relative uncertainty of the measurement system was estimated to be less than 2.4%. The dependence of mutual diffusion coefficient on temperature and solution concentration was studied. The mutual diffusion coefficients of these three binary mixtures increase with the increase of temperature and have a nearly linear relationship with the solution concentration. And the image processing process of holographic interference image is introduced in detail. Zhang et al .’s model, Darken model and Vignes model were used to predict the mutual diffusion coefficients of the three binary mixtures, the absolute average of relative deviations (AARDs) are 2.97%, 3.89% and 6.18%, respectively and Zhang et al .’s model is the one with the best agreement among the three models.
研究领域:
化学工程
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物理化学
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热力学
✓ 已验证
产品关联
DOI
高影响因子
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