Contributions of aromatic conjunction and aromatic inner carbons to molar volume of polyaromatic hydrocarbons

Satou, Masaaki; Nakamura, Takatoshi; Hattori, Hideshi; Chiba, Tadatoshi

doi:10.1016/s0016-2361(99)00245-8

Cited by 10 publications

(17 citation statements)

References 10 publications

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“…Density measurement is the simplest way to estimate the cohesive forces and, therefore, the interaction energies of a particular material. The density is also a measurement of the molecular packing of the solid, and in the case of aromatic compounds, this packing strongly depends on the structural molecular topology of the molecules . For instance, it has been found that the asphaltene density varies linearly with the hydrogen-to-carbon ratio…”

Section: Resultsmentioning

confidence: 99%

Assessment of Asphaltene Stability in Crude Oils Using Conventional Techniques

et al. 2003

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Fundamental physicochemical factors involved in asphaltene precipitation under ambient conditions are studied in an effort to correlate them with the precipitation behavior observed in the oilfields. Asphaltene stabilization was evaluated by flocculation onset determination in titration experiments. The reversibility of asphaltene precipitation at ambient conditions was also explored with the proposed titration technique. It was found that the flocculation onsets of recombined long distillation residua are usually lower than the ones of the original samples.This finding suggests an irreversible nature of the process; this irreversibility is particularly observed for crude oils deemed stable from their field production records. Physicochemical characterization of crude oil hydrocarbon group-types was carried out and their influence on asphaltene stability was evaluated. Stable crude oils are characterized by possessing asphaltenes with lower density and lower aromaticity, compared with asphaltenes from unstable crude oils. Their resins show a higher stabilizing activity than the ones from unstable crude oils, and their maltenes also exhibit higher asphaltene stabilization effectiveness. Flocculation onsets of stable crude oils are higher than the flocculation onsets of unstable oils, at the same asphaltene content in the sample to be titrated. On the basis of this finding, a simple method is proposed for the evaluation of the possible risk of asphaltene precipitation in the oilfields.

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Section: Resultsmentioning

confidence: 99%

Assessment of Asphaltene Stability in Crude Oils Using Conventional Techniques

et al. 2003

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“…According to Satou and coworkers (Satou et al, 2000), the expression (4) estimates the total volume of aliphatic plus naphtenic structures. The severely hydrocracked sample (HCKGU) was barely observed to swell in alkanes, result that clearly correlates with the small aliphatic volume calculated for this sample.…”

Section: Carbognani and Rogelmentioning

confidence: 99%

“…According to Satou and coworkers (Satou et al, 2000), the expression (4) estimates the total volume of aliphatic plus naphtenic structures. (Details can be found elsewhere for swelling determination (Carbognani and Rogel, 2002a) and volume calculation (Satou et al, 2000). 11.…”

Section: Carbognani and Rogelmentioning

confidence: 99%

Solid Petroleum Asphaltenes Seem Surrounded by Alkyl Layers

Carbognani

Rogel

2003

Petroleum Science and Technology

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In this review, a comprehensive analysis of recent results obtained in our laboratory and published in the literature is presented, which points toward the existence of alkyl layers surrounding precipitated asphaltene solids. A micellar model for asphaltenes has been proposed, which explains many of the experimental determinations carried out to date with these compounds. The model considers the existence of alkyl moieties surrounding the inner aromatic cores. Faster dissolution kinetics of asphaltenes modified by coprecipitated waxes has been explained by the enhanced incorporation of alkanesurrounded particles into the eluent employed in the dissolution experiments. Finally, asphaltene volumetric changes brought by organic solvents have recently been studied, and can be explained by the existence of an alkyl layer prone to the incorporation of solvent molecules. This paper will discuss these aspects that seem to support the model long time ago postulated by Yen and coworkers.

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“…The extremes observed on the concentration dependences of the partial molar volumes of naphtha lene in mixtures of methanol-octane-naphthalene can be explained by the effects of packaging. Additives of naphthalene do not produce monotonic depen dences of these characteristics as does the mole frac tion of octane in the mixtures, due most likely to the molar volumes of the molecules of naphthalene and octane being similar, as was noted by Sato [23].…”

Section: Resultsmentioning

confidence: 63%

“…One possible cause of the observed nonlinear dependence was studied by Sato et al in [23]. The authors showed that the molar volumes of PAHs are substantially less than those of alkanes at the same number of carbon atoms in the molecular composi tions of both components.…”

Section: Resultsmentioning

confidence: 98%

Dependence of the volume characteristics and viscosity of solutions of methanol-octane-naphthalene on composition at 25°C

Dyshin

Eliseeva

Киселев

2014

Russ. J. Phys. Chem.

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The limiting solubility of naphthalene in a mixture of methanol-octane at 25°C is determined via isothermal saturation. The kinematic viscosity of a mixture of methanol-octane-naphthalene is measured at 25°C. Data on the density of triple mixtures of methanol-octane-naphthalene, used to calculate the par tial and apparent molar volumes of naphthalene, are obtained with a high degree of accuracy. The obtained results are discussed in terms of the interactions that occur in solution.

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Contributions of aromatic conjunction and aromatic inner carbons to molar volume of polyaromatic hydrocarbons

Cited by 10 publications

References 10 publications

Assessment of Asphaltene Stability in Crude Oils Using Conventional Techniques

Assessment of Asphaltene Stability in Crude Oils Using Conventional Techniques

Solid Petroleum Asphaltenes Seem Surrounded by Alkyl Layers

Dependence of the volume characteristics and viscosity of solutions of methanol-octane-naphthalene on composition at 25°C

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