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Investigation of asphaltene molecular weights

✍ Scribed by Speros E. Moschopedis; John F. Fryer; James G. Speight

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
628 KB
Volume
55
Category
Article
ISSN
0016-2361

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✦ Synopsis

The molecular weights of asphaltenes, as determined by vapour-pressure osmometry, vary considerably and are dependent upon the nature of the solvent as well as the temperature. The data are interpreted in terms of association (of the asphaltene units) in solvents of low dielectric constant and dissociation in solvents of high dielectric constant. Data derived by means of a viscometric method yield inconsistent values for asphaltene molecular weights, and recognition of these inconsistencies causes some revision of the theory of the physical structure of petroleums, bitumens and asphalts.

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