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Effect of n-alkanes on asphaltene structuring in petroleum oils

Christian Stachowiak1, Jean-Romain Viguié, Jean-Pierre E Grolier

  • 1Laboratoire de Thermodynamique des Solutions et des Polymères UMR 6003, Université Blaise Pascal, 24, Avenue des Landais, 63177 Aubière Cedex, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 18, 2005
PubMed

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Constitutional Isomers of Alkanes

Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism.
The linear isomer of an alkane is prefixed by the term “n”; hence a linear isomer of pentane is known as n-pentane. Based on the type of branching, some of the branched isomers are given...
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In the late 19th-century, the number of new chemical compounds discovered increased tremendously. Hence, the necessity arose to develop a naming system for the systematic nomenclature of these newly discovered compounds. IUPAC (International Union for Pure and Applied Chemistry), established in 1919, sets rules for the nomenclature.
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The formation of carbon-carbon bonds leading to the creation of the carbon chain is the basis of organic chemistry. August Kekulé and Archibald Scott Couper independently developed this idea of carbon chain formation.
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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
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Mass Spectrometry: Branched Alkane Fragmentation

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