Asphaltenes in Bitumen, What They Are and What They Are Not
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Abstract
ABSTRACT ABSTRACT 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 been created. In this paper we conclude that the asphaltenes consist of a very heterogeneous fraction with molecular weights from about 250 g/mol up to 2000 g/mol, with an average of about 750 g/mol. The amount of the hetero atoms nitrogen and oxygen is not enough to make asphaltenes particular polar. A careful examination of the chemistry of asphaltenes reveals that they consist basically of three types of molecules, polycyclic aromatic compounds, n-alkanes with a chain length larger than 40 carbons and metal containing porphyrines. KEYWORDS: BitumenAsphaltenesSolubilityPorphyrinesPolyaromaticStructure
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Research context
OpenAlex topics: Petroleum Processing and Analysis · Hydrocarbon exploration and reservoir analysis · Enhanced Oil Recovery Techniques
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