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Separation and characterization of asphaltenes from Saudi Arabian crudes

✍ Scribed by Misbah-ul-Hasan; M.Nahid Siddiqui; M. Arab

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
407 KB
Volume
67
Category
Article
ISSN
0016-2361

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✦ Synopsis

The separation and characterization of asphaltenes from the four marketable Saudi Arabian crudes have been carried out by various analytical techniques. The asphaltenes were precipitated by addition of excess npentane to the heavy ends of each crude; Arab heavy crude gave the greatest yield. Elemental analysis showed the greatest amount of nitrogen, indicating the presence of basic functional groups, in Arab heavy crude and the greatest amount of oxygen, indicating the presence of acidic functional groups, in Arab Berri crude. Arab heavy asphaltenes also showed the highest molecular weight and phenol interaction value. In a spot test the amount of n-pentane or n-heptane required for the precipitation of asphaltenes was greatest for Arab Berri crude. Infrared spectra showed characteristic frequencies indicating the presence of several types of functional groups.

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