Results 111 to 120 of about 6,753 (224)

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
doaj   +1 more source

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

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
doaj  

Destabilization and Aggregation Kinetics of Asphaltenes. [PDF]

Asphaltenes are the heaviest fraction of crude oil and can precipitate due to changes in temperature, pressure or composition. It was previously shown that the precipitation and aggregation of asphaltenes is a kinetic phenomenon.
Haji Akbari Balou, Nasim
core  

REACTIVITY OF ASPHALTENES IN DIRECT COAL LIQUEFACTION. [PDF]

, 1985
Analytical data for four asphaltenes isolated from different stages of a direct coal liquefaction process are reported. Long contact times under hydrocracking conditions produce asphaltenes of lower H:C ratio, lower heteroatom content and higher ...
Kemp, W., Steedman, W., Thomson, M. A., Scott, D. A.   +3 more
core  

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 ...
doaj  

Wax Adsorption on Carbonaceous Materials Including Asphaltenes [PDF]

In this work, the adsorption of waxes on different carbonaceous materials is studied to help in the understanding of the wax–asphaltene association that can lead to the possible deposition of these crude oil components.
Carlo Syliangco (12468613), Estrella Rogel (1302993), James Hudson (3057867)   +2 more
core   +1 more source

PYROLYSIS AND HYDROPYROLYSIS OF COAL ASPHALTENES. [PDF]

, 1984
Coal asphaltenes and their behaviour under typical coal liquefaction conditions have attracted considerable attention in recent years because of both their proposed role as intermediates in liquefaction processes and the potential problem presented by ...
Kemp, W., Thomson, M. A., Steedman, W.
core  

Shale Asphaltene Nanostructure and Gas Preservation: A Molecular-Level Structure-Function Relationship and Predictive Modeling. [PDF]

ACS Omega
Wang L, Gao S, Peng Q, Deng C, Yang J, Yuan P, Feng D, Li S, Peng Y.   +8 more
europepmc   +1 more source

Asphaltene biodegradation and transcriptome responses of hydrocarbon degradation genes in soil by a novel tolerant fungal consortium. [PDF]

Environ Sci Pollut Res Int
Barrera MS, Marín C, Cortés-Espinosa DV, Zafra G.   +3 more
europepmc   +1 more source