Partially Oxidized Asphaltene as a Bitumen Viscosity Reducer

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Heavy oil/bitumen with asphaltene requires high energy consumption for transportation, because of its high viscosity. This often causes serious pipeline problems; therefore, it is necessary to reduce the viscosity to resolve these issues. In this paper, we propose a new simple method to reduce the viscosity of diluted bitumen using partially oxidized asphaltene without removing asphaltene. This partially oxidized asphaltene, modified by exposing asphaltene to ozone, has a strong affinity to nonoxidized asphaltene via pi-pi stacking, hydrogen bonding, and acid-base interaction. The added oxidized asphaltene thus facilitated the agglomeration of asphaltene, so that the hydrophilic part can be hidden, and a small amount (1250 ppm) decreased the viscosity of diluted bitumen by up to 45%. We investigated the change in rheological properties of the diluted bitumen for various oxidized fractions of asphaltene and for various fractions of oxidized asphaltene to asphaltene. We showed that the decreased shear viscosity is likely to originate with the increased particle size of the asphaltene, that is, not the change in interactions between the asphaltene particles, but rather from their nonuniform distribution in size.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-09
Language
English
Article Type
Article
Keywords

PHYSICAL-PROPERTY MEASUREMENTS; PARTICLE-SIZE DISTRIBUTION; HEAVY CRUDE OILS; ATHABASCA BITUMEN; RHEOLOGICAL PROPERTIES; NEWTONIAN SUSPENSIONS; PHASE-BEHAVIOR; TEMPERATURE; NANOFLUIDS; TRANSPORT

Citation

ENERGY & FUELS, v.31, no.9, pp.9240 - 9246

ISSN
0887-0624
DOI
10.1021/acs.energyfuels.7b01639
URI
http://hdl.handle.net/10203/226625
Appears in Collection
CBE-Journal Papers(저널논문)
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