Physical and Chemical Characterizations of Asphaltenes From Different Sources

Demırbas, Ayhan

doi:10.1081/lft-120003573

Cited by 27 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The composition of asphalts and other heavy fractions has been the subject of several investigations over the years and it is still currently receiving much attention (Gun, 1973;Marvillet, 1975;Hagen, 1989;Andersen and Speight, 2001;Demirba, 2002;Gawel, 1997, 2004;Cong et al, 2004;Trejo et al, 2004). This is because the chemical composition of asphalt determines its properties together with the end uses.…”

Section: Group Chemical Compositionmentioning

confidence: 97%

Influence of Chemical Composition on the Physical Characteristics of Paving Asphalts

Oyekunle

2007

Petroleum Science and Technology

View full text Add to dashboard Cite

The simplest general compositional model considers asphalt to be made up of asphaltenes, heavy oils, and resins. In the present study the extent of similarity between the properties and composition of various types of asphalt obtained from different sources has been carefully explored. It shows how ductility, penetration, and softening point are related to the chemical nature of paving asphalts in the range 41-58 softening points. Asphalt properties are found to be a direct function of its chemical constituents. The relationship between softening point and asphaltene content was found to be linear while asphalts of the same softening point are easily distinguished by the content of the resins. Evaluation of the two asphalt indices-the asphaltene index (I A ) and the Gaestel index (I C ), reveals that they both vary linearly with the composition of asphaltenes and resins thus confirming their suitability in the characterization of asphalts. Comparison of the two indices shows that IC is more suitable in estimating the colloidal stability of different groups of asphalts. The observed correlations can be found useful in the areas of asphalt blending and rejuvenating through the appropriate selection of asphalt components.

show abstract

Section: Group Chemical Compositionmentioning

confidence: 97%

Influence of Chemical Composition on the Physical Characteristics of Paving Asphalts

Oyekunle

2007

Petroleum Science and Technology

View full text Add to dashboard Cite

show abstract

“…Internal combustion engines burn gasoline in a controlled process called deflagration (Demirbas, 2002).…”

Section: Gasolinementioning

confidence: 99%

Octane Rating of Gasoline and Octane Booster Additives

Demırbas

Balubaid

Basahel

et al. 2015

Petroleum Science and Technology

View full text Add to dashboard Cite

Gasoline is a petroleum-derived liquid that is used primarily as a fuel in internal combustion engines (ICE), particularly spark ignition Otto Engine. Gasoline is a blend of hydrocarbons with some contaminants, including sulfur, nitrogen, oxygen, and certain metals. The four major constituent groups of gasoline are olefins, aromatics, paraffins, and napthenes. Octane number (ON) is measure of the ignition quality or flammability of gasoline. The ONs are Research Octane Number (RON) and Motor Octane Number (MON). RON is measured relative to a mixture of isooctane and n-heptane. Antiknock Index (AKI) is a measure of a fuel's ability to resist engine knock or octane quality. The AKI is an arithmetic average of RON and MON. The ON decreases with an increase chain length in the hydrocarbon molecule. The ONs increase with carbon chain branching. Another way of increasing the ON is used gasoline octane boosters as additives, such as tetraethyl lead (TEL), methyl tertiary-butyl ether (MTBE), and ferrocene. Aromatic alcohols, ethanol, and methanol also increase the ON of gasoline. The advantage to adding oxygenates, such as MTBE, methanol, and ethanol, to gasoline is that they cause very little pollution when they burn and are cleaner fuels.

show abstract

“…When assessing the colloidal stability of asphalts, the most important factor taken into account is the content of the asphaltenes. Recent studies have looked closely into the chemical composition and structure of asphaltenes [21,24,39,[40][41][42][43][44]. Thus, the two asphalt indices; I A and I C , which bear direct relationship to the content of asphaltenes can be conveniently used to estimate the extent of colloidal stability.…”

Section: The Colloidal Instability Of the Asphaltsmentioning

confidence: 99%

Certain Relationships between Chemical Composition and Properties of Petroleum Asphalts from Different Origin

Oyekunle¹

2006

Oil & Gas Science and Technology - Rev. IFP

View full text Add to dashboard Cite

Résumé -Des relations entre la composition chimique et les propriétés de bitumes d'origines différentes -Les bitumes sont habituellement classés selon trois propriétés physiques : ductilité, pénétration et point de ramollissement. L'étude présentée ici démontre à travers plusieurs exemples que ces traits physiques ne sont pas assez distinctifs. Il a été découvert que la composition chimique apporte davantage d'enseignements sur les différentes propriétés physiques des bitumes. On note des différences remarquables entre la composition chimique de bitumes de même point de ramollissement et de même origine. Une plus grande ductilité provient d'une plus forte teneur en résines alors qu'une pénétration moindre est la conséquence d'une plus grande teneur en asphaltènes. La corrélation de deux indices et de la composition de bitumes révèle que l'indice Gaestël (1 c ) est un meilleur paramètre de caractérisation de bitumes que l'indice d'asphaltène (1 A ). Ces deux indices peuvent être utilisés comparativement pour distinguer des bitumes ayant des points de ramollissement voisins. Abstract -Certain Relationships between Chemical Composition and Properties of Petroleum

show abstract

Physical and Chemical Characterizations of Asphaltenes From Different Sources

Cited by 27 publications

References 8 publications

Influence of Chemical Composition on the Physical Characteristics of Paving Asphalts

Influence of Chemical Composition on the Physical Characteristics of Paving Asphalts

Octane Rating of Gasoline and Octane Booster Additives

Certain Relationships between Chemical Composition and Properties of Petroleum Asphalts from Different Origin

Contact Info

Product

Resources

About