Results 281 to 290 of about 35,311 (304)
Some of the next articles are maybe not open access.
, 2018
Asphaltenes are polydisperse, compositionally complex solubility fractions of crude oil, with a range of structural motifs that contain two primary structural classes: molecules with single aromatic cores (island) and bridged aromatic moieties ...
D. Giraldo-Dávila +4 more
semanticscholar +1 more source
Asphaltenes are polydisperse, compositionally complex solubility fractions of crude oil, with a range of structural motifs that contain two primary structural classes: molecules with single aromatic cores (island) and bridged aromatic moieties ...
D. Giraldo-Dávila +4 more
semanticscholar +1 more source
, 2016
The main objective of this study is to investigate the effect of resin I on the adsorption behavior of n-C7 asphaltenes onto silica and hematite nanoparticles.
Camilo A. Franco +4 more
semanticscholar +1 more source
The main objective of this study is to investigate the effect of resin I on the adsorption behavior of n-C7 asphaltenes onto silica and hematite nanoparticles.
Camilo A. Franco +4 more
semanticscholar +1 more source
Nanoaggregates of Diverse Asphaltenes by Mass Spectrometry and Molecular Dynamics
, 2017Asphaltene nanoaggregates for three diverse source materials—coal-derived asphaltenes dominated by aromatic carbon, petroleum asphaltenes with comparable abundances of aromatic and aliphatic carbon, and immature source-rock asphaltenes dominated by ...
Weiguo Wang +16 more
semanticscholar +1 more source
1964
High-quality roofing asphalts are found to contain high-molecular-weight asphaltenes which exhibit a high tolerance for saturates and have a low carbon-to-hydrogen (C/H) ratio. These asphaltenes are believed to possess a few long, paraffinic side chains rather than many short chains or naphthenic groups. Evidence supporting this hypothesis was provided
T. Deahl, J. Illman
openaire +2 more sources
High-quality roofing asphalts are found to contain high-molecular-weight asphaltenes which exhibit a high tolerance for saturates and have a low carbon-to-hydrogen (C/H) ratio. These asphaltenes are believed to possess a few long, paraffinic side chains rather than many short chains or naphthenic groups. Evidence supporting this hypothesis was provided
T. Deahl, J. Illman
openaire +2 more sources
, 2017
Emulsions with interface-active components at the water/oil (w/o) interface are of fundamental and practical interest in many fields. Here we investigate the interfacial films of asphaltenes and asphaltenes/polyacrylamide (PAM) at the w/o interface of ...
Ming-shi Duan +6 more
semanticscholar +1 more source
Emulsions with interface-active components at the water/oil (w/o) interface are of fundamental and practical interest in many fields. Here we investigate the interfacial films of asphaltenes and asphaltenes/polyacrylamide (PAM) at the w/o interface of ...
Ming-shi Duan +6 more
semanticscholar +1 more source
Influence of Asphaltene Inhibitors on Wax and Asphaltene Deposition - Are Problems Associated?
Offshore Technology Conference Brasil, 2019Abstract Organic deposition formed at high temperatures in oil and gas production systems is commonly linked to instability of asphaltenes. Recent studies revealed that deposits collected in offshore production wells produced in Gulf of Mexico exhibited compositional variation pointing to a more complex fouling process than solely ...
Janaina I. S. Aguiar +2 more
openaire +2 more sources
, 2017
This work introduces a novel approach by use of high-energy collision-induced dissociation for fragmenting asphaltenes into their constituent stable aromatic cores as a means for determining the relative proportions of island-to-archipelago structures ...
Leonard Nyadong +7 more
semanticscholar +1 more source
This work introduces a novel approach by use of high-energy collision-induced dissociation for fragmenting asphaltenes into their constituent stable aromatic cores as a means for determining the relative proportions of island-to-archipelago structures ...
Leonard Nyadong +7 more
semanticscholar +1 more source
, 2017
Thermal cracking and catalytic (molybdenum naphthenate) hydrocracking processes in toluene solvent were carried out in a batch reactor for a typical Colombian heavy vacuum residue and its corresponding separated maltenes and asphaltenes fractions.
A. León +5 more
semanticscholar +1 more source
Thermal cracking and catalytic (molybdenum naphthenate) hydrocracking processes in toluene solvent were carried out in a batch reactor for a typical Colombian heavy vacuum residue and its corresponding separated maltenes and asphaltenes fractions.
A. León +5 more
semanticscholar +1 more source
Applied Clay Science, 1986
Abstract Asphaltene adsorption measurements with a well crystallized kaolin, a poorly crystallized kaolin, and a montmorillonite under anhydrous conditions and in the presence of water showed that the adsorption varied depending on the properties of the clay and the amount of water.
Kim Renea Dean, James L. McAtee
openaire +2 more sources
Abstract Asphaltene adsorption measurements with a well crystallized kaolin, a poorly crystallized kaolin, and a montmorillonite under anhydrous conditions and in the presence of water showed that the adsorption varied depending on the properties of the clay and the amount of water.
Kim Renea Dean, James L. McAtee
openaire +2 more sources
, 2017
Asphaltenes represent the heaviest and the most polar fraction of crude oil. The interaction of asphaltenes with other fractions of crude oil can affect its overall polarity and stability.
A. Punase, B. Hascakir
semanticscholar +1 more source
Asphaltenes represent the heaviest and the most polar fraction of crude oil. The interaction of asphaltenes with other fractions of crude oil can affect its overall polarity and stability.
A. Punase, B. Hascakir
semanticscholar +1 more source