Results 61 to 70 of about 18,552 (210)

Optimization of the Load of Transition Metal Oxides (Fe2O3, Co3O4, NiO and/or PdO) onto CeO2 Nanoparticles in Catalytic Steam Decomposition of n-C7 Asphaltenes at Low Temperatures

Nanomaterials, 2019
The main objective of this work is the catalyst optimization of Fe2O3-, Co3O4-, NiO- and/or PdO- (transition element oxides—TEO) functionalized CeO2 nanoparticles to maximize the conversion of asphaltenes under isothermal conditions at low ...
Oscar E. Medina, Jaime Gallego, Daniela Arias-Madrid, Farid B. Cortés, Camilo A. Franco   +4 more
doaj   +1 more source

Evaluation of the Influence of Antifoam Formulations on Asphaltene Aggregates Using AFM and SEM‐EDS

Journal of Applied Polymer Science, Volume 143, Issue 3, January 15, 2026.
ABSTRACT Asphaltenes, naturally occurring surfactants in crude oil play a pivotal role in stabilizing oily foams during primary oil processing. Accordingly, understanding how antifoam formulations influence asphaltene aggregation is essential. This study investigates the effect of polydimethylsiloxane (PDMS) with varying molar masses on asphaltene ...
Mariana Teixeira Mendes, Andressa Oliveira dos Santos, Rafael Farias Perez, Osvaldo Karnitz Junior, Claudia Regina Elias Mansur   +4 more
wiley   +1 more source

Effect of Asphaltenes and Asphaltene Dispersants on Wax Precipitation and Treatment

Colloids and Interfaces
A detailed understanding of the interactions between wax and asphaltenes with other components of crude oils and the effect of treatments with paraffin inhibitors (PIs) and asphaltene dispersants (ADs), with a focus on identifying specific structure ...
Oualid M’barki, John Clements, Quoc P. Nguyen   +2 more
doaj   +1 more source

An Evaluation of the Delayed-Coking Product Yield of Heavy Feedstocks Using Asphaltene Content and Carbon Residue Évaluation du rendement en produit de cokéfaction différée de pétrole lourd à l'aide de la teneur an asphaltènes et du résidu de coke

Oil & Gas Science and Technology, 2006
Six residua from different crude oils were evaluated for composition and carbon residue forming tendencies. The whole residua were evaluated for elemental composition, trace metals content, carbon residue, and specific gravity.
Schabron J. F., Speight J. G.
doaj   +1 more source

Waxes in asphaltenes of crude oils and wax deposits

Petroleum Science, 2016
Composition and molecular mass distribution of n-alkanes in asphaltenes of crude oils of different ages and in wax deposits formed in the borehole equipment were studied. In asphaltenes, n-alkanes from C12 to C60 were detected.
Yulia M. Ganeeva, Tatiana N. Yusupova, Gennady V. Romanov   +2 more
doaj   +1 more source

Structural Characterisation of Asphaltenes during Residue Hydrotreatment with Light Cycle Oil as an Additive

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
doaj   +1 more source

Role of oxidative pretreatment on asphaltenes enhancement for carbon fiber precursor production from vacuum residue (VR)

Next Materials
There is growing interest in utilizing petroleum residue to useful carbon materials for economic diversification of low-value petroleum byproducts. Due to chemical complexity and the presence of impurities, it requires pretreatment which traditionally ...
Mustafa M. Amin, Ajay Sharma, Mohammad M. Hossain, Muhammad N. Siddiquee   +3 more
doaj   +1 more source

Molecular Weight and Association of Asphaltenes: a Critical Review Masse moléculaire et association des asphaltènes : une revue critique

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., Wernick D. L., Gould K. A., Overfield R. E., Rao B. M. L.   +4 more
doaj   +1 more source

Analysis of asphaltenes and maltenes before and after long-term aging of bitumen

, 2021
Xiaohu Lu, H. Soenen, P. Sjövall, Georgios Pipintakos   +3 more
semanticscholar   +1 more source

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, Daniel-Ricardo Molina-Velasco, Arlex Chaves-Guerrero   +2 more
doaj