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Nov 15, 2021· Two bitumen samples, coded as B25 and B26, respectively, were investigated. The bitumen samples have an identical penetration grade of 160/220, but they differ in chemical compositions and structures .The samples were aged by Rolling Thin Film Oven Test (RTFOT, EN 12607-1) followed by Pressure Aging Vessel (PAV, EN 14769) …
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Jun 08, 2004· In this work, the onset and amount of asphaltene precipitation from Athabasca bitumen were investigated in a PVT cell using three different methods over a range of temperatures and pressures. Results are presented for the precipitation of asphaltenes from the bitumen diluted with nalkanes, including n-heptane, n-pentane, n …
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Aug 19, 2022· In this paper, the rheological behavior of bitumen as a function of asphaltene concentration has been studied. Several bitumen samples having distinctly different amounts of asphaltene were prepared and characterized using differential scanning calorimetry and rheological measurements. ... Luo and Y. Gu, " Effects of …
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Asphaltenes from bitumen are abundant resource to be transformed into carbon as promising supercapacitor electrodes, while there is a lack of understanding the impact from different fractions of bitumen and asphaltenes, as well as the presence of transition ...
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an asphaltene content of 26.71 %. It is noticeable that there is an abrupt increase in stiffness, when only low Torque M DSR base plate DSR spindle Cover Bitumen sample Fig. 2 CR test using DSR experimental equipment Table 1 Experimental program for CR tests on artificially mixed bitumen Asphaltene content Test temperature - 5 C?15 0 0 vol
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asphaltene content increases from 0% to 40%, the oil's viscosity and density increase dramatically and its color changes from clear to dark brown. Viscosity is a critical rheological property of reservoir fluids; it affects fluid mobility from the reservoir and through production systems. Viscosity
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Deasphalting bitumen using paraffinic solvent injection is a commonly used technique to reduce both its viscosity and density and ease its flow through pipelines. Common modeling approaches for asphaltene precipitation prediction such as population balance model (PBM) contains complex mathematical relation and require conducting precise experiments to …
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Sep 20, 2011· Asphaltenes in bitumen and crude oil are generally defined as the fraction which is insoluble in n-heptane. There is also a perceived definition which describes asphaltenes as a very polar, high molecular weight fraction in bitumen. The standard definition and the perceived definition are not identical and thus a lot of confusion has …
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Bitumen and heavy oils produced in Alberta frequently contain asphaltenes. These asphaltenes may play a significant role in the primary upgrading or visbreaking of the bitumen and heavy oils. This paper describes an experimental study of the effect of asphaltene content on the viscosity of bitumen.
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The proportion of asphaltenes present in any particular bitumen, or the asphaltene content (by mass), remains the most useful parameter for describing the compositional characteristics of the bitumen. The asphaltene content has been shown to be related to …
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The organic solvent separates the resids into demetallized oil with lower metal and asphaltene content than the feed, and asphalt with high metal content. Figure 3-2 shows the IFP deasphalting process and Table 3-2 shows the analysis of feed before and after solvent treatment. Solvent extraction is used extensively in the petroleum refining ...
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Jan 01, 2006· ABSTRACT The definition of asphaltenes and some of its chemical properties like polarity and molecular weight is discussed, based on available knowledge. A critical examination of the currently common claim that asphaltenes is dispersed in bitumen in the shape of micelles is made. It is concluded that it is not likely that any micelles exist in …
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Nov 11, 2022· As the most complex and heaviest component in bitumen, asphaltene precipitation induced by solvent dilution is important in oil sands extraction to remove solids and water from bitumen froth through dilution by paraffinic solvents. This review will compare asphaltene precipitation to dilution-induced solvent shifting in aqueous systems …
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Apr 14, 2016· Different strategies for solvent injection are tested (coinjection and cyclic injection) to examine the impact of the deposition of the asphaltene fraction of the bitumen on porous media and the behavior of the asphaltene fraction in produced oil. Toluene is used as asphaltene-soluble solvent, and n-hexane is selected as asphaltene-insoluble ...
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Sep 01, 1986· Abstract. The ability to transport bitumen, in solutions of low viscosity solvents, can be seriously affected by asphaltene precipitation. Solvents differ dramatically in their ability to dissolve asphaltenes and often those which are inexpensive and readily available have poor solvating properties. Titrating a solution of bitumen in the solvent of …
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Jul 29, 2022· In this paper, the rheological behavior of bitumen as a function of asphaltene concentration has been studied. Several bitumen samples having distinctly different amount of asphaltene were prepared and characterized using scanning calorimetry and rheological measurements. The glass transition temperature of bitumen increases with increase of …
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Aug 02, 2016· As asphaltene content increases from 0% to 40%, the oil's viscosity and density increase dramatically and its color changes from clear to dark brown. ... In addition, the terms tar and bitumen are loosely used to refer to materials that have a high asphaltene content. Sometimes black oilfield solids, including waxy deposits that have …
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A sufficient number of static creep tests on artificially composed bitumen samples with asphaltene contents from 0 to 30 wt% served both as identification as well as validation experiments for the developed micromechanical model. An excellent agreement between experimental results and model predictions indicates that the model is able to ...
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As a consequence of its high asphaltene content, bitumen is substantially denser and more viscous than conventional oil, and thus, it gives rise to challenges in the forms of sedimentation, deposition, precipitation, fouling, coke formation, and catalyst deactivation in both upstream and downstream processes.
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CLSM was able to show the distribution of maltene and asphaltene components in bitumen. The asphaltene aggregates in the bitumen were observed to be 2-7 micro m in size and formed a dispersed 'sol' structure in the continuous maltene matrix rather than a network 'gel' structure. Surprisingly, the structure and fluorescence of the asphaltene ...
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