Results 221 to 230 of about 23,867 (262)
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1998
Asphaltenes have been studied extensively over the past 50–60 years.1–2 A number of experimental techniques have been employed. The simplest and most widely used technique is the measurement of the solubilities of isolated asphaltenes in various organic liquids, both aromatic solvents and flocculants like pentane.3–4 These studies yield valuable ...
Hilde Anfindsen, Per Fotland
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Asphaltenes have been studied extensively over the past 50–60 years.1–2 A number of experimental techniques have been employed. The simplest and most widely used technique is the measurement of the solubilities of isolated asphaltenes in various organic liquids, both aromatic solvents and flocculants like pentane.3–4 These studies yield valuable ...
Hilde Anfindsen, Per Fotland
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Fuel, 2016
Abstract Phosphopropoxylated asphaltenes were synthesized by functionalizing the Mexican VR asphaltenes with phosphorus trichloride and then reacting the product with different polypropylene oxides. Elemental analysis, and molecular weight characterization showed that in average one atom of phosphorus and one propoxyl moiety are incorporated to the ...
Estrella Rogel +3 more
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Abstract Phosphopropoxylated asphaltenes were synthesized by functionalizing the Mexican VR asphaltenes with phosphorus trichloride and then reacting the product with different polypropylene oxides. Elemental analysis, and molecular weight characterization showed that in average one atom of phosphorus and one propoxyl moiety are incorporated to the ...
Estrella Rogel +3 more
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, 2017
Advances in high-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) enable molecular-level characterization of ultracomplex asphaltene samples.
M. Chacón-Patiño +2 more
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Advances in high-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) enable molecular-level characterization of ultracomplex asphaltene samples.
M. Chacón-Patiño +2 more
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Effect of Asphaltene Polarity on Wax Precipitation and Deposition Characteristics of Waxy Oils
Energy & Fuels, 2019Asphaltenes are natural pour point depressants, and the effect of asphaltene polarity on the low-temperature rheology of waxy oils has been well studied.
Chuanxian Li +6 more
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SPE Western Regional Meeting, 2016
Abstract Significant effort has been dedicated to understand the variables affecting asphaltene precipitation. Based on years of research, it is well known how variables such as temperature and pressure can affect the deposition of asphaltenes.
Andreas Prakoso +5 more
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Abstract Significant effort has been dedicated to understand the variables affecting asphaltene precipitation. Based on years of research, it is well known how variables such as temperature and pressure can affect the deposition of asphaltenes.
Andreas Prakoso +5 more
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On Enthalpies of Solution of Athabasca Pentane Asphaltenes and Asphaltene Fractions
Energy & Fuels, 2012The analysis and prediction of asphaltene precipitation behaviors and asphaltene–diluent interactions are typically treated from either a solution thermodynamics or a colloid perspective. The polydispersity and multiphase nature of asphaltenes allows for portions of these materials to exhibit both behaviors concurrently at fixed global composition.
Kasra Nikooyeh, John M. Shaw
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Alkylation of Asphaltenes [PDF]
, 2015 This work investigated different acid catalysts and olefinic alkylating agents for the alkylation of an industrial asphaltenes feed. The working hypothesis was that alkylation would change the solubility parameter and increase the H/C ratio of asphaltenes sufficiently to cause some asphaltenes to maltenes conversion.
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Energy & Fuels, 2012
Asphaltenes extracted from seven different crude oils representing different geological formations from around the globe were analyzed using the Raman spectroscopic technique. Each spectrum is fitted with four main peaks using the Gaussian function. On the basis of D1 and G bands of the Raman spectrum, asphaltene indicated an ordered structure with the
Abdallah, Wael A., Yang, Yang
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Asphaltenes extracted from seven different crude oils representing different geological formations from around the globe were analyzed using the Raman spectroscopic technique. Each spectrum is fitted with four main peaks using the Gaussian function. On the basis of D1 and G bands of the Raman spectrum, asphaltene indicated an ordered structure with the
Abdallah, Wael A., Yang, Yang
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Interfacial Rheology and Heterogeneity of Aging Asphaltene Layers at the Water-Oil Interface.
Langmuir, 2018Surface-active asphaltene molecules are naturally found in crude oil, causing serious problems in the petroleum industry by stabilizing emulsion drops, thus hindering the separation of water and oil. Asphaltenes can adsorb at water-oil interfaces to form
Chih-Cheng Chang +8 more
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Asphaltene Prediction and Prevention: A Strategy to Control Asphaltene Precipitation
SPE/PAPG Annual Technical Conference, 2012ABSTRACT Asphaltene Precipitation and Deposition is a serious problem which can reduce the oil recovery by reducing reservoir permeability and altering the wettability. It can plug wells and flow lines through deposition and also cause separation difficulties at the separation facilities.
Muhammad Ali Buriro +1 more
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