Results 101 to 110 of about 6,753 (224)
Probing Asphaltenes Aggregation with Fluorescence Techniques [PDF]
, 2014 Asphaltenes correspond to the fraction of oil that is insoluble in heptane but is soluble in toluene. The aggregates of asphaltene are of interest because they cause serious problems in the production of oil.
Zhang, Hui Ting
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Study of hydrogenation of petroleum asphaltenes [PDF]
, 1981 Isolated petroleum asphaltenes were subjected to model thermal and catalytic hydrogenation experiments in the temperature region 300-450° C. The course of hydrogenation of the asphaltenes studied is discussed based on 1H-NMR type analysis of the starting
Gustav Šebor +4 more
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Journal of Chemistry, 2015 Several atmospheric residues (AR) of Kuwaiti crude, in the absence, or in the presence, of light cycle oil (LCO) as an aromatic additive, were hydrotreated in an experimental plant.
Yong-Jun Liu, Zhi-Feng Li
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The composition and thermal properties of waxes in oil asphaltenes [PDF]
, 2015 © 2015 Akadémiai Kiadó, Budapest, Hungary. Asphaltenes of four Russian and Kyrgyzstan crude oils were investigated with calorimetry, gas chromatography and X-ray diffraction analysis. It was established that asphaltenes contain waxes.
Samigullina A. +4 more
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Comparative reactivities of coal asphaltenes during hydropyrolysis [PDF]
, 1985 Comparisons have been drawn in the relative reactivities of three coal asphaltenes during hydropyrolysis. All were derived from hydrogen donor-solvent extracts of bituminous coal, but had different hydrotreatment histories and different carbon contents ...
Kemp, W. +3 more
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REVIEW OF STUDIES ON ASPHALTENE - WAX INTERACTION AND THE EFFECT THEREOF ON CRYSTALLIZATION
CT&F Ciencia, Tecnología & Futuro, 2014 This paper reviews the impact of asphaltenes on wax crystallization and on the properties of crude oils, and the consequences thereof on the flow assurance of waxy crude oil.
Emiliano Ariza-León +2 more
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Oil & Gas Science and Technology, 2006 The determination of asphaltene molecular weights is complicated by the tendency of asphaltene molecules to associate with each other and with other petroleum constituents, and reported molecular weights vary from 900 to 300 000.
Speight J. G. +4 more
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GEOCHEMISTRY OF PETROLEUM: ASPHALTENES AS A SOURCE OF GEOCHEMISTRY INFORMATION [PDF]
, 2016 Because of physical and geochemical similarity of asphaltenes with kerogen, the study of asphaltenes provides information for applications in geochemical petroleum.
Cerqueira, Jose Roberto +5 more
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AVALIAÇÃO DE ASFALTENOS PRECIPITADOS EM DIFERENTES CONDIÇÕES DE COMPOSIÇÃO, TEMPERATURA E PRESSÃO
Química NovaAsphaltenes 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 +1 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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