Molecular thermodynamics for prevention of asphaltene precipitation

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Description

Crude petroleum is a complex mixture of compounds with different chemical structures and molecular weights. Asphaltenes, the heaviest and most polar fraction of crude oil, are insoluble in normal alkanes such as n-heptane, but they are soluble in aromatic solvents such as toluene. The molecular nature of asphaltenes and their role in production and processing of crude oils have been the topic of numerous studies. Under some conditions, asphaltenes precipitate from a petroleum fluid, causing severe problems in production and transportation Our research objective is to develop a theoretically based, but engineering-oriented, molecular-thermodynamic model which can describe the phase behavior ... continued below

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29 p.

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Wu, Jianzhong & Prausnitz, J.M. June 1, 1996.

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Description

Crude petroleum is a complex mixture of compounds with different chemical structures and molecular weights. Asphaltenes, the heaviest and most polar fraction of crude oil, are insoluble in normal alkanes such as n-heptane, but they are soluble in aromatic solvents such as toluene. The molecular nature of asphaltenes and their role in production and processing of crude oils have been the topic of numerous studies. Under some conditions, asphaltenes precipitate from a petroleum fluid, causing severe problems in production and transportation Our research objective is to develop a theoretically based, but engineering-oriented, molecular-thermodynamic model which can describe the phase behavior of asphaltene precipitation in petroleum fluids, to provide guidance for petroleum-engineering design and production. In this progress report, particular attention is given to the potential of mean force between asphaltene molecules in a medium of asphaltene-free solvent. This potential of mean force is derived using the principles of colloid science. It depends on the properties of asphaltene and those of the solvent as well as on temperature and pressure. The effect of a solvent on interactions between asphaltenes is taken into account through its density and through its molecular dispersion properties.

Physical Description

29 p.

Notes

OSTI as DE96014983

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  • Other Information: PBD: Jun 1996

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  • Other: DE96014983
  • Report No.: LBNL--38991
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/374166 | External Link
  • Office of Scientific & Technical Information Report Number: 374166
  • Archival Resource Key: ark:/67531/metadc677586

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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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  • June 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 5, 2016, 10:21 a.m.

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Wu, Jianzhong & Prausnitz, J.M. Molecular thermodynamics for prevention of asphaltene precipitation, report, June 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc677586/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.