Structural Characterization of Asphaltenes and Ethyl Acetate Insoluble Fractions of Petroleum Vacuum Residues
IR@IIP: CSIR-Indian Institute of Petroleum, Dehradun
View Archive Info| Field | Value | |
| Creator |
Sharma,B.K
Sharma,C.D Tyagi,O.S Bhagat,S.D Erhan,S.Z |
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| Date |
2009-07-13T04:14:58Z
2009-07-13T04:14:58Z 2009-07-13T04:14:58Z |
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| Identifier |
Petroleum Science and Technology, 25:121–139, 2007
http://hdl.handle.net/123456789/325 |
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| Description |
Asphaltenes and insoluble fractions of vacuum residues (VRs) of two Indian
crude oils (viz. Heera and Jodhpur) of different specific gravity were obtained
by precipitation of VRs in n-hexane, n-heptane, and ethyl acetate, and also by subsequent
reprecipitation of n-heptane and ethyl acetate soluble fractions by n-pentane.
The effect of various solvents on average molecular structure of asphaltenes and insolubles
was studied using nuclear magnetic resonance spectroscopy (NMR), Fourier
transform infrared spectroscopy (FTIR), and size exclusion chromatography (SEC).
The asphaltenes and insolubles of Jodhpur VR have higher amounts of high molecular
weight species with a high concentration of condensed and substituted aromatic
rings, branched and/or short alkyl side chains, oxygen and nitrogen functionalities,
compared to that of Heera VR. Ethyl acetate insolubles comprise a higher number
of substituted aromatic structures, branched aliphatic structures, complex average unit
structures, nitrogen and oxygen functionalities, and high molecular weight (MW)
species as compared to hexane and heptane asphaltenes. Heptane insolubles consist
of more naphthenic rings condensed with aromatic rings than C6A and EAI.
Keywords: asphaltenes, FTIR, insolubles, NMR, petroleum, SEC, vacuum residue
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| Language |
en_US
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| Subject |
NMR
FTIR Asphaltenes |
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| Title |
Structural Characterization of Asphaltenes and Ethyl Acetate Insoluble Fractions of Petroleum Vacuum Residues
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| Type |
Article
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