Solvent recovery in solvent deasphalting process for economical vacuum residue upgrading
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Type
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Journal
Article
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Author
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Seonju
Ahn
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Author
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Sangcheol
Shin
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URL
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Volume
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33
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Issue
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1
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Pages
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265-270
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Publication
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Korean
Journal of Chemical Engineering
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Date
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2015/10/22
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Abstract
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The
solvent deasphalting (SDA) process is a heavy oil upgrading process, used to
separate asphaltene, using density differences, to obtain deasphalted oil
(DAO). The SDA process consists of two main stages: asphaltene separation and
solvent recovery. Solvent recovery is a key procedure for determining the
operating cost of the SDA process, because it uses a considerable amount of costly
solvent, the recovery of which consumes huge amounts of energy. Researchers
simulated the SDA process using three distinct solvents: propane, n-butane,
and isobutane, to examine their effect on the DAO extraction and the effect
of the operating temperature and pressure on solvent recovery.
The process was designed to contain one extractor, two flash drums, and two steam strippers. The VR was characterized by identifying 15 pseudo-components based on the boiling point distribution, obtained by performing a SIMDIS analysis, and the API gravity of the components. When n-butane was used, the yield of DAO was higher than in the other cases, whereas isobutane showed a similar extraction performance as propane. Researchers observed solvent recovery to increase with temperature and decrease with pressure for all the solvents that were tested. The best results were obtained for propane. |
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