Results 91 to 100 of about 6,740 (225)

AVALIAÇÃO DE ASFALTENOS PRECIPITADOS EM DIFERENTES CONDIÇÕES DE COMPOSIÇÃO, TEMPERATURA E PRESSÃO

Química Nova
Asphaltenes are a heavy fraction of petroleum with the ability for self-association, a phenomenon that can occur spontaneously in the reservoirs or in any of the various stages of production and processing, depending on variations in pressure ...
Lyzette Gonçalves Moraes de Moura, Paulo de Tarso Vieira e Rosa   +1 more
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Chemical modification of cobalt ferrite nanoparticles with possible application as asphaltene flocculant agent

Materials Research, 2013
Asphaltenes can cause enormous losses in the oil industry, because they are soluble only in aromatic solvents. Therefore, they must be removed from the petroleum before it is refined, using flocculant agents. Aiming to find new materials that can work as
G. E. Oliveira, J. E. S. Clarindo, K. S. E. Santo, F. G. Souza Jr.   +3 more
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The molecular composition and geochemical applications of asphaltenes [PDF]

, 2010
PhD ThesisAsphaltenes are the heaviest components of petroleum and bitumen consisting of a complex mixture of heteroaromatic substances that have been associated with various deposition problems in both upstream and downstream sectors of the petroleum ...
Muhammad, Aminu Bayawa
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Study of asphaltene reaggregation in toluene/heptane mixture by dynamic and static light scattering

Petroleum Research
This paper presents the study of the effect of multiple ultrasonic impacts on submicron asphaltene aggregates in a toluene/heptane solution, conducted with dynamic light scattering technique.
Vladimir N. Kuryakov
doaj   +1 more source

Precipitation and characterization of petroleum asphaltenes.

, 2004
The goal of this work is to obtain a better understanding of the properties of petroleum asphaltenes and their stability in term of asphaltene precipitating tendency.
Wattana, Piyarat
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A Review of Asphaltenes: Composition, Structure, Properties, Behavior, and Applications

Engineered Science
Asphaltenes are the highly aromatic and polar fractions of crude oil defined by their insolubility in n-alkanes and solubility in aromatics. They exhibit complex molecular compositions, broad molecular weight distributions, and a strong tendency to self ...
Yerbol Tileuberdi, Ulan Kuoshiken, Yerdos Ongarbayev, Marat Tulepov, Nurgul Shadin, Dinara Sadirbekova, Laila Zhussupova, Yerzhan Imanbayev, Ainur Zhambolova   +8 more
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Oxidation of Petroleum Asphaltenes Coupled with Iodination

, 2020
© 2020, Springer Science+Business Media, LLC, part of Springer Nature. Oxidation of petroleum asphaltenes by potassium iodide (KI) is described. Oxidation under mild conditions is shown to be accompanied by iodination of the asphaltene aromatic core. The
Saifina A.F., Borisov D.N., Shabalin K.V., Khannanov A.A., Musin L.I., Vakhitov I.R., Foss L.E., Gubaidullin A.T., Nagornova O.A.   +8 more
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Modeling of asphaltenes: Assessment of sensitivity of 13C SSNMR to molecular structure

, 2012
journal articleAsphaltenes are an important constituent of many oils and one of the major components in heavy oils sources for liquid hydrocarbon fuels.
Badu, Shyam; Pimienta, Ian S. O.; Orendt, Anita M.; Pugmire, Ronald J.; Facelli, Julio C.
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The Critical Micelle Concentration of Asphaltenes as Measured by Calorimetry

, 1999
Micellization of asphaltenes in solution has been investigated using a micro calorimetric titration procedure (Andersen, S. I.; Birdi, K. S. J Colloid Interface Sci. 1991, 142, 497).
Christensen, S.D., Christensen, S. D., Andersen, Simon Ivar   +2 more
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Investigation of Asphaltene Stability in the Iranian Crude Oils [PDF]

Iranian Journal of Chemical Engineering, 2008
The influence of different factors on the asphaltene stability in three iranian crude oils was evaluated. Compositional studies and structural characterization of resins and asphaltenes were carried out in order to study a possible relationship between ...
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