Asphaltene is one of the most heavy components, asphaltene adsorption is a serious problem in oil production and processing. In this paper, the progress in the investigation of asphaltene adsorption from the aspects o...Asphaltene is one of the most heavy components, asphaltene adsorption is a serious problem in oil production and processing. In this paper, the progress in the investigation of asphaltene adsorption from the aspects of adsorption model and adsorption behavior is reviewed. Asphaltene of adsorption model include the Langmuir, Freundlich, Langmuir-Freundlich, Rcdlich-Pctcrson, BET adsorption isothcrm. The adsorption behavior of asphaltene was characterized by a variety of structure-probing methods such as N：-adsorption, X-ray diffraction （XRD）, small-angle X-ray scattering （SAXS） measurements, and FT-IR spectroscopy. To understand better the adsorption progress of petroleum, asphaltene must understand the whole adsorption behavior of asphaltene.展开更多
Elemental analysis, Fourier transform infrared （FTIR）, 1H-NMR, fluorescence spectroscopy, and surface tension methods have been used to characterize the molecular structure and the aggregation behaviors of two aspha...Elemental analysis, Fourier transform infrared （FTIR）, 1H-NMR, fluorescence spectroscopy, and surface tension methods have been used to characterize the molecular structure and the aggregation behaviors of two asphaltenic fractions derived, respectively, from an Alge- rian petroleum well and a corresponding storage tank deposit. Elemental analysis, FTIR, ~H-NMR, and fluores- cence spectroscopy were used to investigate the chemical composition and structural parameters of asphaltenes, while the surface tension method was used to measure the critical micelle concentration （CMC） in organic solvents with different solubility parameters and polarities in order to characterize the asphaltenes＇ aggregation behaviors. Results show that the unstable asphaltenes fraction extracted from the storage tank deposit possesses a higher polarity （higher heteroatoms content） and a lower aro- maticity than stable asphaltenes from the petroleum well. The CMC results indicate that asphaltenes with high polarity and low aromaticity have a high solubility in polar solvents such as nitrobenzene, whereas asphaltenes with low polarity and high aromaticity are more soluble in solvents with weak polarity, like toluene. It is concludedthat the difference of structure of asphaltene samples and polarity of solvents can lead to difference of aggregation behaviors.展开更多
文摘Asphaltene is one of the most heavy components, asphaltene adsorption is a serious problem in oil production and processing. In this paper, the progress in the investigation of asphaltene adsorption from the aspects of adsorption model and adsorption behavior is reviewed. Asphaltene of adsorption model include the Langmuir, Freundlich, Langmuir-Freundlich, Rcdlich-Pctcrson, BET adsorption isothcrm. The adsorption behavior of asphaltene was characterized by a variety of structure-probing methods such as N：-adsorption, X-ray diffraction （XRD）, small-angle X-ray scattering （SAXS） measurements, and FT-IR spectroscopy. To understand better the adsorption progress of petroleum, asphaltene must understand the whole adsorption behavior of asphaltene.
文摘Elemental analysis, Fourier transform infrared （FTIR）, 1H-NMR, fluorescence spectroscopy, and surface tension methods have been used to characterize the molecular structure and the aggregation behaviors of two asphaltenic fractions derived, respectively, from an Alge- rian petroleum well and a corresponding storage tank deposit. Elemental analysis, FTIR, ~H-NMR, and fluores- cence spectroscopy were used to investigate the chemical composition and structural parameters of asphaltenes, while the surface tension method was used to measure the critical micelle concentration （CMC） in organic solvents with different solubility parameters and polarities in order to characterize the asphaltenes＇ aggregation behaviors. Results show that the unstable asphaltenes fraction extracted from the storage tank deposit possesses a higher polarity （higher heteroatoms content） and a lower aro- maticity than stable asphaltenes from the petroleum well. The CMC results indicate that asphaltenes with high polarity and low aromaticity have a high solubility in polar solvents such as nitrobenzene, whereas asphaltenes with low polarity and high aromaticity are more soluble in solvents with weak polarity, like toluene. It is concludedthat the difference of structure of asphaltene samples and polarity of solvents can lead to difference of aggregation behaviors.
