Could anybody let me know the chemical and physical difference between asphaltene and resin, such as molecular weight, H/C ratio, number of aromatic rings, length of aliphatic chains and so forth.
Please express quantitative values.
Sincerely
Resins are soluble in the liquids that precipitate asphaltenes and can be separated from the residua in the maltene mixture by chromatography. They are coprecipitated with asphaltenes in propane deasphalting processes and are strongly adsorbed onto the asphaltenes. Resins can be released from asphaltene by exhaustive extraction with n-pentane. They are usually separated from the residue by desorption with chloroform after chromatography through a silica gel column containing methylcylcohexane as solvent. Resins are considered smaller analogues of asphaltenes with a much lower molecular weight. For this reason, the bulk of the resins can be preparatively separated by gel permeation chromatography as well as by centrifugal thin layer chromatography. The resins contain aromatic compounds substituted with longer alkyls and a higher number of side chains attached to the rings than asphaltenes. The combination of the saturated and the aromatic characteristics of the resins stabilizes the colloidal nature of the asphaltenes in the oil medium [1].
[1] Mullins OC, Sheu EY, editors. Structures and dynamics of asphaltenes. Springer Science & Business Media; 2013.
For more information on the chemical and physical properties of asphaltene and resin:
Speight, J. G. "Petroleum Asphaltenes-Part 1: Asphaltenes, resins and the structure of petroleum." Oil & gas science and technology 59.5 (2004): 467-477.
Buenrostro-Gonzalez, E., Espinosa-Pena, M., Andersen, S. I., & Lira-Galeana, C. (2001). Characterization of asphaltenes and resins from problematic Mexican crude oils. Petroleum science and technology, 19(3-4), 299-316.
Dear Amir Hossein.
Dr. Acevedo and al."Analysis of the Photo Conversion of Asphaltenes Using Laser Desorption Ionization Mass Spectrometry: Fragmentation, Ring Fusion, and Fullerene Formation Using Laser Desorption Ionizatio Mass Spectrometry". Journal of Petroleum Science and Technology. 2018, 8(2), 57-69.
Article Analysis of the Photo Conversion of Asphaltenes Using Laser ...
We found fullerene formation was observed in the case Asphaltene but no formation was observed in the case Resin the same LS range used.
Asphaltenes are defined as the fraction separated from crude oil or petroleum products upon addition of hydrocarbon solvents such as n-heptane but dissolve in aromatic solvents such as toluene. It is suggested that asphaltenes are a mixture of polynuclear aromatics, some of which are capable of self-association. Resins are defined as the fraction of the desasphalted oil that is rapidly adsorbed in surface-active materials and can only be desorbed by a solvent such as a mixture of toluene and methanol. Resins have a strong tendency to associate with asphaltenes. Such association determines, to a large extent, their solubility in crude oil. Therefore, thermodynamic models that are used to study association systems are useful to study asphaltenes and resins association and deposition phenomenon.
Asphaltene is more polar than resin
The molecular weight of asphaltene is usually higher than that of resin
Asphaltenes have more aromatic rings than resins
There are more aromatic rings in asphaltene than in resins
Aliphatic branches are longer in resins than in asphaltsins (in asphaltins the carbon number of aliphatic branches is less than 6 and in resins it reaches 12 carbon)
The solubility parameter in asphaltene is higher than in resins
The density of asphaltene is higher than resins
I agree with everything you say, but you have not said anything new, you are referring to the operational definition of Asphaltenes
That new property that we are finding is the most updated.
Our results agree with those found by Bava et al, Energy Fuels 2019, 33, 2950-2960.
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