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- W2277778885 abstract "The classic definition of asphaltenes is based on the solution properties of petroleum residua in various solvents. This generalized concept has been extended to fractions derived from other carbonaceous sources, such as coal and oil shale. With this extension, there has been much effort to define asphaltenes in terms of chemical structure and elemental analysis as well as by the carbonaceous source. Thus, there are petroleum asphaltenes, coal tar asphaltenes, shale oil asphaltenes, tar sands bitumen asphaltenes, and so on. This paper will attempt to show how these materials are special cases of an overall concept based directly on the physical chemistry of solutions. The concept of asphaltenes is rooted in the solubility behavior of high boiling hydrocarbonaceous materials in benzene and low molecular weight n-paraffin hydrocarbons. This behavior is a result of physical chemistry effects which are due to a spectrum of chemical properties. This paper has pointed out that by considering molecular weight and molecular polarity as separate properties of molecules, the solvent precipitation behavior of materials derived from various carbonaceous sources can be understood. Future quantification of this approach can probably be achieved by developing a polarity scale based on solubility parameter." @default.
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- W2277778885 date "1979-09-01" @default.
- W2277778885 modified "2023-09-23" @default.
- W2277778885 title "Concept of asphaltenes" @default.
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