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On the Mass Balance of Asphaltene Precipitation

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Authors:
  • Andersen, Simon Ivar ;
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    Center for Phase Equilibria and Separation Processes, Department of Chemical and Biochemical Engineering, Technical University of Denmark
  • Lira-Galeana, C. ;
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    unknown
  • Stenby, Erling Halfdan
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    Orcid logo0000-0002-2296-069X
    Center for Phase Equilibria and Separation Processes, Department of Chemical and Biochemical Engineering, Technical University of Denmark
DOI:
10.1081/lft-100000776
Abstract:
In the evaluation of experimental data as well as in calculation of phase equilibria the necessity of the application of mass balances is obvious. In the case of asphaltenes the colloidal nature of these compounds may highly affect the mass balance. In the present paper several experiments are performed in order to check the consistency of mass balances within asphaltene precipitation. Asphaltenes are precipitated in two step processes either by changing temperature or by changes in precipitant with increasing precipitation power. This has been performed for three different oils. The data indicates that in temperature experiments as well as in solvent series experiments the precipitation of heavy asphaltenes affects the following precipitation of lighter asphaltenes. In both cases the mass balance using standard separation techniques cannot be closed, as less material is precipitated in a two step process than in the direct process either at low temperature or by direct precipitation with one precipitant. The different fractions were subject to HPLC size exclusion chromtagraphy showing that the material remaining in solution in the stepwise process was of low molecular weight, and that the material in the second precipitation step was often of higher apparent molecular weight anti had an increased overall absorbance coefficient.
Type:
Journal article
Language:
English
Published in:
Petroleum Science and Technology, 2001, Vol 19, Issue 3-4, p. 457-467
Keywords:
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2001
Scientific Level:
Scientific
ID:
11672702

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