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Refractive index measurements of diluted bitumen solutions

✍ Scribed by Shawn D. Taylor; Jan Czarnecki; Jacob Masliyah

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
128 KB
Volume
80
Category
Article
ISSN
0016-2361

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✦ Synopsis

The objective of this study was to obtain estimates for the refractive indices of bitumen, maltenes, and asphaltenes. Refractive index measurements performed on various bitumenΒ±solvent mixtures were analyzed using a mixing model that related the refractive index of an ideal mixture to the refractive indices of the pure components of the mixture. Measurements could only be obtained for bitumenΒ±solvent mixtures ranging in bitumen volume fraction from 0 to about 0.50. Extrapolation to a volume fraction of unity provided estimates of 1.584, 1.571 and 1.708 for the refractive indices of bitumen, maltenes, and asphaltenes, respectively. A precipitating solvent was also used to show that the onset of asphaltene precipitation could be detected from refractive index measurements. For a mixture of heptane and bitumen, the onset of asphaltene precipitation appeared to occur at a bitumen volume fraction of about 0.32.

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