Observation of Stepwise Association of Petroleum-derived Asphaltene and Maltene Components by Surface Tension Measurements

Zhang, Yan; Takanohashi, Toshimasa; Sato, Shinya; Saito, Ikuo; Tanaka, Ryuzo

doi:10.1627/jpi.47.32

Cited by 5 publications

(7 citation statements)

References 16 publications

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“…However, some limitations and assumptions must be acknowledged here. Most importantly, there may be a doubt about how much the Δ H mix estimated for asphaltenes reflects molecule−molecule interactions, because asphaltenes are known to aggregate at very low concentrations, as we and some other researchers have reported. ,, Our previous results suggested that the aggregation of asphaltenes in quinoline started from low concentrations near 10 mg/L. Therefore, the asphaltene concentration of 30 mg/20 cm 3 (1.5 g/L), which was used for microcalorimetry measurements in this study, was much higher than the initial aggregation concentration of asphaltene (10 mg/L).…”

Section: Resultsmentioning

confidence: 66%

Estimating the Interaction Energy of Asphaltene Aggregates with Aromatic Solvents

et al. 2005

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The molecular interactions between asphaltenes and solvents are an important parameter that dominates the processing behavior of asphaltenes. This study has developed a method for estimating the interaction energy of asphaltene (or resin) aggregates with aromatic solvent molecules. The thermal properties of three asphaltenes and one resin have been ascertained using differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA), and the heats of solution (∆H solu ) of the two species in quinoline, 1-methyl naphthalene (1-MN), and tetralin have been established using microcalorimetry. By combining the two techniques, the heat of mixing (∆H mix ) of the asphaltene or the resin with the solvents could be estimated. This not only evaluates the nature of interactions between asphaltene (or resin) aggregates and solvent but also provides a quantitative estimate of their magnitude.

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Section: Resultsmentioning

confidence: 66%

Estimating the Interaction Energy of Asphaltene Aggregates with Aromatic Solvents

et al. 2005

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“…No significant difference exists in the relationship found among the different asphaltenes, and there is a linear correlation between MWps and MWms, which differs from the polystyrene calibration curve. 16 New Calibration Standard. The results in Figure 4 indicate that a more-precise picture of MW distribution, as determined by GPC, is possible if the calibration curve were revised to bridge existing gaps.…”

Section: Resultsmentioning

confidence: 99%

“…Where suitable standards are available, other than polystyrene, GPC has the merit of providing data over the entire MW range without the limitations that are inherent in MS. We have studied the aggregation behavior of asphaltene using molecular modeling and molecular dynamic techniques, where the determination of the MW distribution is a primary consideration. [11][12][13][14][15][16][17] This paper investigates the correlation between the MW derived using polystyrene standards (MWps) and that determined using MS (MWms), over a small molecular range, and it compares the data obtained with the GPC/MS results.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, GPC is inexpensive and easy to maintain. Where suitable standards are available, other than polystyrene, GPC has the merit of providing data over the entire MW range without the limitations that are inherent in MS. We have studied the aggregation behavior of asphaltene using molecular modeling and molecular dynamic techniques, where the determination of the MW distribution is a primary consideration. − …”

Section: Introductionmentioning

confidence: 99%

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Molecular Weight Calibration of Asphaltenes Using Gel Permeation Chromatography/Mass Spectrometry

2005

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Molecular weight (MW) is one of the most important properties of asphaltene. To determine the precise average MW using gel permeation chromatography (GPC), the MWs obtained for three different asphaltenes using GPC (MWps) and GPC-MSD (MWms) were compared. MWms proved independent of asphaltene type and had values similar to MWps for a MW of ∼900 but was significantly different in the lower-MW range, with a linear correlation between MWms and MWps. More-precise average MW values can be obtained using a revised calibration curve based on three new chemicals to convert MWps to MWms.

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“…Other surface tension measurements [107] and micro-calorimetric studies [97] co firmed the prediction of the ASP structure at several length scales, as proposed by t Yen-Mullins structural model [48]. It is worth noting that with low aggregation numb (N < 10), the critical threshold of the transition from monomers to nanoaggregates is n so sharp in terms of concentration [108].…”

Section: Critical Micelle Critical Nanoaggregation and Critical Clust...mentioning

confidence: 64%

The Structure of Bitumen: Conceptual Models and Experimental Evidences

et al. 2022

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Bitumen, one of the by-products of petroleum industry processes, is the most common binder used in road pavements and in the construction industry in general. It is a complex organic mixture of a broad range of hydrocarbons classified into four chemical families, collectively known with the acronym SARA fractions, which include saturates, aromatics, resins and asphaltenes. Since the 1940s, researchers working on bitumen and the science behind its existence, nature and application have investigated the spatial organization and arrangement of several molecular species present in the binder. Therefore, several models have been proposed in the literature, and they are more or less corroborated by experimental studies, although most of them are model-dependent; for example, the structural investigations based on scattering techniques. One of the most popular models that has met with a wide consensus (both experimentally and of the modeling/computational type) is the one aiming at the colloidal description of bitumen’s microstructure. Other types of models have appeared in the literature that propose alternative views to the colloidal scheme, equally valid and capable of providing results that comply with experimental and theoretical evidence. Spurred by the constant advancement of research in the field of bitumen science, this literature review is aimed at providing a thorough, continuous and adept state of knowledge on the modeling efforts herein elaborated, in order to more precisely describe the intricacy of the bituminous microstructure. In this body of work, experimental evidence, along with details of bitumen’s microstructure (depicting the colloidal state of bitumen), is particularly emphasized. We will also try to shed light on the evolution of the experimental and theoretical results that have focused on the aspect of the association and aggregation properties of asphaltenes in various models and real systems.

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Observation of Stepwise Association of Petroleum-derived Asphaltene and Maltene Components by Surface Tension Measurements

Cited by 5 publications

References 16 publications

Estimating the Interaction Energy of Asphaltene Aggregates with Aromatic Solvents

Estimating the Interaction Energy of Asphaltene Aggregates with Aromatic Solvents

Molecular Weight Calibration of Asphaltenes Using Gel Permeation Chromatography/Mass Spectrometry

The Structure of Bitumen: Conceptual Models and Experimental Evidences

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