Results 271 to 280 of about 35,311 (304)
Some of the next articles are maybe not open access.
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
openaire +2 more sources
, 2018
In part 1 (10.1021/acs.energyfuels.7b03657), the synergistic effect of ethylene–vinyl acetate copolymer (EVA) pour point depressant (PPD) and rensin-stabilized asphaltenes on improving the flowability of synthetic waxy oil has been verified.
Bo Yao +7 more
semanticscholar +1 more source
In part 1 (10.1021/acs.energyfuels.7b03657), the synergistic effect of ethylene–vinyl acetate copolymer (EVA) pour point depressant (PPD) and rensin-stabilized asphaltenes on improving the flowability of synthetic waxy oil has been verified.
Bo Yao +7 more
semanticscholar +1 more source
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.
openaire +1 more source
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
openaire +3 more sources
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
openaire +3 more sources
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
openaire +2 more sources
Langmuir, 2016
The behaviors and molecular interactions of asphaltenes are related to many challenging issues in oil production. In this study, the molecular interaction mechanism of asphaltenes in Heptol solvents of varying toluene/n-heptane ratio were directly ...
Ling Zhang +4 more
semanticscholar +1 more source
The behaviors and molecular interactions of asphaltenes are related to many challenging issues in oil production. In this study, the molecular interaction mechanism of asphaltenes in Heptol solvents of varying toluene/n-heptane ratio were directly ...
Ling Zhang +4 more
semanticscholar +1 more source
, 2018
Here, the concept of suppression of phase separation is proposed to account for the solubility behavior of asphaltenes at high dilution in toluene under ambient conditions.
S. Acevedo +7 more
semanticscholar +1 more source
Here, the concept of suppression of phase separation is proposed to account for the solubility behavior of asphaltenes at high dilution in toluene under ambient conditions.
S. Acevedo +7 more
semanticscholar +1 more source
Mixture Effect on the Dilatation Rheology of Asphaltenes-Laden Interfaces.
Langmuir, 2017Asphaltenes are a solubility class of crude oils comprising polyaromatic and heterocyclic molecules with different interfacial activities. The previously neglected effects of compositional mixture on dilatational rheology are discussed in the light of ...
Fang Liu +5 more
semanticscholar +1 more source
2017
Asphaltenes are the heaviest constituents of crude oil. The bottom of the bottom of the barrel is a complex mixture of macromolecules containing heteroatomic moieties. Although exhibiting high molecular weight, these molecules do not form a continuum as other hydrocarbon classes do.
openaire +2 more sources
Asphaltenes are the heaviest constituents of crude oil. The bottom of the bottom of the barrel is a complex mixture of macromolecules containing heteroatomic moieties. Although exhibiting high molecular weight, these molecules do not form a continuum as other hydrocarbon classes do.
openaire +2 more sources
The Role of Asphaltene Solubility and Chemical Composition on Asphaltene Aggregation
Petroleum Science and Technology, 2003Abstract Asphaltenes from four different crude oils (Arab Heavy, B6, Canadon Seco, and Hondo) were fractionated in mixtures of heptane and toluene and analyzed by small angle neutron scattering (SANS). Fractionation appeared to concentrate the most polar species into the least soluble sub-fraction as indicated by elemental analysis.
Keith L. Gawrys +2 more
openaire +2 more sources