Browsing NTNU Open by Author "Subramanian, Sreedhar"
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Asphaltene fractionation based on adsorption onto calcium carbonate: Part 1. Characterization of sub-fractions and QCM-D measurements
Subramanian, Sreedhar; Simon, Sebastien Charles; Gao, Bicheng; Sjøblom, Johan (Journal article; Peer reviewed, 2016)A new fractionation procedure was developed based on adsorption of asphaltenes onto calcium carbonate. The fractions obtained were characterized by elemental analysis, Fourier Transform Infrared Spectroscopy (FTIR) and ... -
Asphaltene fractionation based on adsorption onto calcium carbonate: Part 2. Self-association and aggregation properties
Subramanian, Sreedhar; Sørland, Geir Humborstad; Simon, Sebastien Charles Roger; Xu, Zhenghe; Sjöblom, Johan (Journal article; Peer reviewed, 2017)The self-association and aggregation properties of asphaltene sub-fractions obtained by adsorption onto CaCO3 (doi:http://dx.doi.org/10.1016/j.colsurfa.2016.02.011) were investigated using a combination of near infrared ... -
Asphaltene fractionation based on adsorption onto calcium carbonate: Part 3. Effect of asphaltenes on wax crystallization
Ruwoldt, Jost; Subramanian, Sreedhar; Simon, Sebastien Charles; Oschmann, Hans-Jörg; Sjøblom, Johan (Journal article; Peer reviewed, 2018)Asphaltenes fractionation procedures were developed and tested in two preceding articles (doi: https://doi.org/10.1016/j.colsurfa.2016.02.011, doi: https://doi.org/10.1016/j.colsurfa.2016.11.035), and asphaltene fractions ... -
Asphaltene Precipitation Models: A Review
Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2016)Asphaltenes are the heaviest and the most polar fractions of crude oil and are defined as a solubility class (typically soluble in toluene but insoluble in n-alkanes like n-heptane). Precipitation and deposition of asphaltenes ... -
Asphaltenes subfractions characterization and calculation of their solubility parameter using ESI(-) FT-ICR MS: Part II
Pinto, Fernanda E.; Fonseca, Victor R.; Souza, Lindamara M.; Terra, Luciana A.; Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan; Pereira, Thieres M.; Lacerda, Valdemar Jr.; Romão, Wanderson (Peer reviewed; Journal article, 2022)Negative ion-mode electrospray (ESI(-)) technique coupled to Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) provides ionization of polar constituents with ultra-high resolution and mass accuracy. ... -
Influence of Fatty-Alkylamine Amphiphile on the Asphaltene Adsorption/Deposition at the Solid/Liquid Interface under Precipitating Conditions
Subramanian, Sreedhar; Buscetti, Lola; Simon, Sebastien Charles; Sacré, Marion; Sjøblom, Johan (Journal article; Peer reviewed, 2018)The ability of a fatty-alkylamine amphiphile to inhibit asphaltene adsorption/deposition, as well as its ability to disperse the asphaltene layers on stainless steel, was studied using a quartz crystal microbalance with ... -
Influence of Microcrystalline Wax on the Properties of Model Wax-Oil Gels
Kurniawan, Muh; Subramanian, Sreedhar; Norrman, Jens; Paso, Kristofer Gunnar (Journal article; Peer reviewed, 2018)The influence of microcrystalline wax addition upon the rheological properties of model wax-oil gels is investigated. Addition of less than 1 wt % microcrystalline wax to a model oil consisting of 5 wt % macrocrystalline ... -
Interaction between asphaltenes and fatty-alkylamine inhibitor in bulk solution
Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2018)In the present work, the mechanism of interaction between asphaltenes and a commercial fatty-alkylamine inhibitor was investigated by a combination of techniques. The “macro” properties, like the asphaltene precipitation ... -
Interfacial dilational rheology properties of films formed at the oil/water interface by reaction between tetrameric acid and calcium ion
Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2017)This article aims to determine the applicability of interfacial dilational rheology to study the formation of viscoelastic film at the oil/water interface by reaction between tetrameric acids ARN and calcium ions, and to ... -
Microcalorimetry Study of the Adsorption of Asphaltenes and Asphaltene Model Compounds at the Liquid–Solid Surface
Pradilla Ragua, Diego Camilo; Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan; Beurroies, Isabelle; Denoyel, Renaud (Journal article; Peer reviewed, 2016)The adsorption of an acidic polyaromatic asphaltene model compound (C5PeC11) and indigenous C6-asphaltenes onto the liquid–solid surface is studied. Model compound C5PeC11 exhibits a similar type of adsorption with a plateau ... -
Mitigation and remediation of asphaltene precipitation, deposition and plug formation: Importance of asphaltene subfractions
Subramanian, Sreedhar (Doctoral theses at NTNU;2017:110, Doctoral thesis, 2017)Asphaltenes represent the heaviest and most polar constituent of petroleum. They consist of a wide range of molecules differing in molecular weight and functional groups. Under reservoir conditions, the asphaltenes generally ... -
Solvent desorption of asphaltenes from solid surfaces
Tapio, Lene Katrin; Subramanian, Sreedhar; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2017)The main goal of this paper is to compare the ability of different organic solvents to desorb asphaltenes from stainless steel surfaces. The asphaltenes were extracted from a North Sea crude oil by precipitation. The organic ... -
Study of the mechanism of demulsification of petroleum crude oil emulsions by demulsifiers
Subramanian, Sreedhar (Master thesis, 2013)The formation of stable emulsions during the production of crude oil is an expensive problem faced by the oil industry. Stable emulsions can be encountered during recovery, treatment or transportation of crude oil. Asphaltenes ...