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Multilevel Screening of Ionic Liquid Absorbents for Simultaneous Removal of CO2 and H2S from Natural Gas
(Peer reviewed; Journal article, 2020)For the selection of practically attractive ionic liquids (ILs) as absorbents for simultaneous CO2 and H2S removal from natural gas (NG), a multilevel screening method combining Henry′s law constant (H) and vapor–liquid ... -
Multiple shooting for training neural differential equations on time series
(Peer reviewed; Journal article, 2021)Neural differential equations have recently emerged as a flexible data-driven/hybrid approach to model time-series data. This work experimentally demonstrates that if the data contains oscillations, then standard fitting ... -
Multiple-Input Single-Output Control for Extending the Steady-State Operating Range—Use of Controllers with Different Setpoints
(Journal article; Peer reviewed, 2019)This paper deals with a case when multiple inputs are needed to cover the steady-state operating range. The most common implementation is to use split range control with a single controller. However, this approach has some ... -
Multiscale Modeling of Interfacial Mass Transport in Liquid-Liquid Dispersions
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:142, Doctoral thesis, 2014)Crude oil is a complex system which consists of many different compounds and substantial amounts of naphthenic acids which can create naphthenate deposits. This can cause significant fouling in the petroleum transport and ... -
Multiscale modeling of mass transfer and adsorption in liquid-liquid dispersions. 1. Molecular dynamics simulations and interfacial tension prediction for a mixed monolayer of mono- and tetracarboxylic acids
(Journal article; Peer reviewed, 2014)Phase space trajectories of protonated and deprotonated mono- and tetracarboxylic acid surfactants at an oil/water interface are obtained from molecular dynamics (MD) simulations and are employed to calculate the interfacial ... -
Multiscale modeling of mass transfer and adsorption in liquid-liquid dispersions. 2. application to calcium naphthenate precipitation in oils containing mono- and tetracarboxylic acids
(Journal article; Peer reviewed, 2014)A dynamic multicomponent mass transport model is constructed and solved to determine the interfacial composition and bulk phase concentrations of surfactant mixtures containing a synthetic tetracarboxylic acid (BP10) and ... -
Multiscale Modelling of the Calcium Naphthenate Precipitation Reaction in Petroleum Processing
(Doctoral thesis at NTNU;2016:53, Doctoral thesis, 2016)The formation of calcium naphthenate precipitates occurring in the petroleum industry is both an undesirable side reaction and can introduce costly shutdowns and cleaning processes. Although the reaction has been studied ... -
Multivariate curve resolution applied to in situ X-ray absorption spectroscopy data: An efficient tool for data processing and analysis
(Journal article; Peer reviewed, 2014)Large datasets containing many spectra commonly associated with in situ or operando experiments call for new data treatment strategies as conventional scan by scan data analysis methods have become a time-consuming bottleneck. ... -
Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO2 separation: effects of ionic liquid and water vapor
(Journal article; Peer reviewed, 2018)Polyelectrolytes have been reported to display gas permeation properties that can be of significant interest for CO2 capture applications, especially when they are fully hydrated. In this work, hybrid membranes prepared ... -
Nafion/PEG hybrid membrane for CO 2 separation: Effect of PEG on membrane micro-structure and performance
(Journal article; Peer reviewed, 2018)In the present work, PEGDME with different molecular weight (Mn ∼ 250 and 500 g/mol) was added into Nafion-based membranes as CO2-philic additive, aiming at improving their CO2 capture performance. The physical, chemical ... -
Nanocellulose Crystal-Enhanced Hybrid Membrane for CO2 Capture
(Peer reviewed; Journal article, 2022)Developing a membrane material with both high CO2 permeability and high CO2/N2 selectivity is always desired for CO2 capture, while improving the sustainability of the membrane preparation process is of equal importance. ... -
Nanocellulose-enriched hydrocolloid-based hydrogels designed using a Ca2+ free strategy based on citric acid
(Peer reviewed; Journal article, 2021)In this work fully biomass-based hydrogels were developed using a naturally occurring vegetable hydrocolloid co-mingled with wood-derived nanocellulose fibrils. Two distinct types of hydrocolloids have been considered: a ... -
Nanocomposite Membranes containing Bio-nanofibers and Mimic Enzyme for Biogas upgrading
(Doctoral theses at NTNU;2018:64, Doctoral thesis, 2018)CO2 is the most dominating anthropogenic greenhouse gas. Combustion of fossil fuels, to meet energy demands is one of the major sources of CO2 emission. Release of CO2 from burning fossil fuel and cement industry has ... -
Nanocomposite membranes with high-charge and size-screened phosphorylated nanocellulose fibrils for CO2 separation
(Peer reviewed; Journal article, 2020)In this study, cellulose nanofibrils (CNF) of high charge (H-P-CNF) and screened size (H-P-CNF-S) were fabricated by increasing the charge of phosphorylated cellulose nanofibrils (P-CNFs) during the pre-treatment step of ... -
Nanomaterials Enhanced Membranes for Carbon Capture
(Doctoral theses at NTNU;2020:253, Doctoral thesis, 2020)Alarming increase in global CO2 emissions has led to climate change. An acceleration in the development of CO2 capture technologies is therefore necessary to facilitate the large-scale implementation of Carbon Capture and ... -
Nanoparticle-stabilized microbubbles for multimodal imaging and drug delivery
(Journal article, 2015)Microbubbles (MBs) are routinely used as contrast agents for ultrasound imaging. The use of ultrasound in combination with MBs has also attracted attention as a method to enhance drug delivery. We have developed a technology ... -
Nanosized Cellulose Fibrils as Stabilizer of Emulsions
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:7, Doctoral thesis, 2011)Pickering emulsions have been a subject of research for many years due to their practical applications not only in everyday life products but also in industry. The stability of these emulsions is due to the irreversible ... -
Nanostructural Analysis of Co-Re/γ-Al2O3 Fischer-Tropsch Catalyst by TEM and XRD
(Journal article; Peer reviewed, 2022)A rhenium promoted Fischer-Tropsch (FT) cobalt catalyst supported on γ-Al2O3 has been investigated by Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD), before and after reduction. Electron diffraction, ... -
Naphthenic acid solubility in produced water and their interactions with divalent cations
(Doctoral theses at NTNU;2018:259, Doctoral thesis, 2018)To keep up with the growing energy demands, the production of high acid crudes is increasing worldwide. This acidity is mainly caused by a subgroup of resins called naphthenic acids. With the increased production and ... -
Natural Gas Dehydration Using Membrane Contactor
(Master thesis, 2022)Natural gas is the cleanest and most preferred energy source due to its high accessibility, low cost, and energy efficiency. Subsea processing aims for underwater natural gas purification at high pressures, enabling the ...