Results 31 to 40 of about 8,294 (210)
, 2016 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 ...
Mao, Xiaohui
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Stability and demulsification of emulsions stabilized by asphaltenes or resins
, 2004 Experimental data are presented to show the influence of asphaltenes and resins on the stability and demulsification of emulsions. It was found that emulsion stability was related to the concentrations of the asphaltene and resin in the crude oil, and ...
Lu, SW, Xia, LX, Cao, GY
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Carbon Energy, EarlyView.A dual‐phase flash Joule heating strategy converts pre‐pyrolyzed biomass into structurally tunable carbon materials from waste feedstocks. By decoupling current‐driven thermodynamic input and duration‐dependent kinetic relaxation, the process maps the transition from amorphous carbon to few‐layer turbostratic graphene and turbostratic nanographite ...
Jiawen Zeng +9 more
wiley +1 more source
, 2012 International audienceAsphaltenes are the polar macromolecules with complex structures in oils, usually existing as aggregates. Inside the macromolecular structures of asphaltenes, some other fractions can be adsorbed/occluded, and the occluded compounds
Liao, Zewen +10 more
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Characterisation of an algerian asphaltene by 1H and 13C CPMAS NMR, DEPT and ESI mass spectroscopy
Egyptian Journal of Petroleum, 2021 Quantitative liquid 1H and solid 13C CPMAS NMR spectroscopy were used in combination with qualitative DEPT (Distortionless Enhancement by Polarization Transfer) and liquid 13C NMR to investigate the molecular structural parameters of an Algerian ...
A.C. Djendara +4 more
doaj +1 more source
Hydrogen donor‐assisted visbreaking of Canadian oil sands bitumen
The Canadian Journal of Chemical Engineering, EarlyView.Abstract High‐viscosity Canadian oil sands bitumen requires processing for efficient transportation and refining. Partial upgrading technologies, primarily based on thermal processing, can effectively reduce, or even eliminate, the use of costly diluent, increase bitumen quality and market value, potentially decrease greenhouse gas (GHG) emissions, and
Yi Zhang, Mohamed Ali, Jinwen Chen
wiley +1 more source
Известия Томского политехнического университета: Инжиниринг георесурсов, 2017 The relevance of the discussed issue is caused by the practical significance of studying aggregation of asphaltenes in oil film and determining the dimensional parameters of micro- and nanostructures of the deposited components.
Yuriy Vladimirovich Korzhov +1 more
doaj +2 more sources
Petroleum ResearchThis study presents analysis of asphaltenes isolated from two crude oils: naphthenic-aromatic biodegraded oil and paraffin-naphthenic oil, which have been used as precursors for carbon materials synthesis.
Andrey Grinko +10 more
doaj +1 more source
Demulsifying agent simplified model for offshore oil wells
The Canadian Journal of Chemical Engineering, EarlyView.Abstract This article addresses key challenges in offshore petroleum production caused by multiphase flow instabilities, such as slug flow and emulsion formation. Traditionally, severe slugging is mitigated by increasing wellhead backpressure through partial choke valve closure. In this context, a simplified dynamic model—the fast offshore wells model (
Fernanda Bernardi de Souza +5 more
wiley +1 more source
Oil & Gas Science and Technology, 2016 Asphaltenes are shown to be amphoteric, containing acidic and basic species that can ionize at low and high pH respectively when they come in contact with water.
Hutin Anthony +2 more
doaj +1 more source