Browsing NTNU Open by Author "Oschmann, Hans-Jörg"
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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 ... -
Inhibitor-wax interactions and PPD effect on wax crystallization: New approaches for GC/MS and NMR, and comparison with DSC, CPM, and rheometry
Ruwoldt, Jost; Sørland, Geir; Simon, Sebastien Charles; Oschmann, Hans-Jörg; Sjøblom, Johan (Journal article; Peer reviewed, 2019)Three pour point depressants (PPDs) with different chemistries, and extracted asphaltenes were studied in their influence on wax crystallization in a model system. A new procedure for nuclear magnetic resonance (NMR) was ... -
Inhibitor-Wax Interactions and Wax Crystallization: New Experimental Approaches and Techniques
Ruwoldt, Jost (Doctoral theses at NTNU;2018:410, Doctoral thesis, 2018)Issues related to wax crystallization are one of the major challenges faced during crude oil production. Wax inhibitors and pour point depressants (PPD) are in common use for wax prevention, as they can delay gelling and ... -
Non-linear dependency of wax appearance temperature on cooling rate
Ruwoldt, Jost; Kurniawan, Muh; Oschmann, Hans-Jörg (Journal article, 2018)The Wax Appearance Temperature (WAT) is usually the first parameter to consider, when assessing whether paraffin wax contained in the crude oil can become an issue during production. As such, correct determination of the ... -
Wax-Inhibitor Interactions Studied by Isothermal Titration Calorimetry and Effect of Wax Inhibitor on Wax Crystallization
Ruwoldt, Jost; Simon, Sebastien Charles; Norrman, Jens; Oschmann, Hans-Jörg; Sjøblom, Johan (Journal article; Peer reviewed, 2017)Isothermal titration calorimetry is applied to investigate the interactions of polymeric pour-point depressants (PPDs) or asphaltenes with macrocrystalline wax in a model oil system. This represents a novel approach to ...