Characterization of asphaltenes from processed resids

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The current and future trend for petroleum processing is towards conversion of heavier and heavier fractions into useful products such as gasoline and diesel. Asphaltenes, the heptane insoluble fraction of heavy oils, are a solubility class and not a specific boiling range. They tend to be the hardest fraction to process in the refinery because of their high molecular mass, aromaticity and heteroatom and metal (S, N, Ni, V) content. Molecular characterization of asphaltenes is important since a more thorough understanding of the chemical nature of the constituents should lead to more efficient processing schemes. A major hurdle in the ... continued below

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5 p.

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Hunt, J.E.; Winans, R.E. & Miller, J.T. April 1, 1997.

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The current and future trend for petroleum processing is towards conversion of heavier and heavier fractions into useful products such as gasoline and diesel. Asphaltenes, the heptane insoluble fraction of heavy oils, are a solubility class and not a specific boiling range. They tend to be the hardest fraction to process in the refinery because of their high molecular mass, aromaticity and heteroatom and metal (S, N, Ni, V) content. Molecular characterization of asphaltenes is important since a more thorough understanding of the chemical nature of the constituents should lead to more efficient processing schemes. A major hurdle in the accurate representation of the molecular structure of asphaltenes has been the determination of the molecular weight. The main problem is the formation of molecular aggregates depending upon factors such as polarity of the solvent, temperature, concentration and others. Over the past 15 years or so, the apparent molecular weight of asphaltenes has dropped significantly lower as the cause and effect of aggregation on molecular weight was determined. Molecular weights as high as 500,000 have been reported for some asphaltenes in the past with weights as low as 600 appearing in the literature recently depending on the analytical method used. In this study, high resolution sector field mass spectrometry was used to determine the comparative speciation of the composition of the asphaltenes from resid subjected to processing conditions.

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5 p.

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OSTI as DE97004683

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  • 213. national meeting of the American Chemical Society, San Francisco, CA (United States), 13-17 Apr 1997

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  • Other: DE97004683
  • Report No.: ANL/CHM/CP--91840
  • Report No.: CONF-970443--14
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 505748
  • Archival Resource Key: ark:/67531/metadc695535

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 12:01 p.m.

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Hunt, J.E.; Winans, R.E. & Miller, J.T. Characterization of asphaltenes from processed resids, article, April 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc695535/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.