Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/320046
Type: Artigo de periódico
Title: Role Of Asphaltenes And Additives On The Viscosity And Microscopic Structure Of Heavy Crude Oils
Author: Padula
L; Balestrin
LBD; Rocha
ND; de Carvalho
CHM; Westfahl
H; Cardoso
MB; Sabadini
E; Loh
W
Abstract: An attempt to understand the microscopic origin of the high viscosity of Brazilian heavy crude oils was made combining macroscopic (theological measurements) and microscopic [small-angle X-ray scattering (SAXS) measurements] techniques. A clear relationship between the asphaltene content and viscosity was found, while the removal of asphaltene via flocculation led to a large viscosity drop, confirming them as the origin of high viscosity. The SAXS analyses of crude oils confirmed the presence of asphaltene aggregates as fractal-like particles of colloidal dimensions. Afterward, a systematic investigation was performed on the effects of a series of additives and physical treatments on the crude oil viscosity. Physical methods did not cause any significant viscosity drop as well as more than 80 additives tested. SAXS measurements on oil samples containing toluene and heptane indicated little effect on the asphaltene nanoaggregates within the dimensions probed by SAXS, confirming a general mode of action based on aggregate dilution instead of disruption.
Subject: Alkylbenzene-derived Amphiphiles
Aggregation
Scattering
Solvents
Bitumen
Stabilization
Temperatures
Model
Ppa
Editor: AMER CHEMICAL SOC
Rights: fechado
Identifier DOI: 10.1021/acs.energyfuels.5b02103
Address: http://pubs-acs-org.ez88.periodicos.capes.gov.br/doi/abs/10.1021/acs.energyfuels.5b02103
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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