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Crystallization behavior of an X-Ray Contrast Agent Intermediate at high Supersaturations and Temperatures
(Master thesis, 2016)This project comprises studies of crystallization of an aromatic amine, which is an intermediate in the production of the X-ray contrast agent Iohexol at GE Healthcare Lindesnes Site. Crystallizations from highly supersaturated ... -
Crystallization kinetics and growth of struvite crystals by seawater versus magnesium chloride as magnesium source: Towards enhancing sustainability and economics of struvite crystallization
(Peer reviewed; Journal article, 2020)The recycling of nutrients from wastewater and their recovery in the form of valuable products is an effective strategy to accelerate the circular economy concept. Phosphorus recovery from wastewater by struvite crystallization ... -
Cu-Promoted Fe-Based Catalyst for Biomass-Derived Synthesis Gas for the Fischer-Tropsch Synthesis
(Master thesis, 2015)Four alumina supported iron-based catalysts were prepared by incipient wetness impregnation. The Fe loading was kept constant at 15 wt.%, and the Cu loading was varied between 0-5 wt.. The catalyst samples were characterized ... -
Curing Kinetic and Dynamics of Alkoxysilane Binders
(Master thesis, 2023)Denne oppgaven undersøker herdingen av tre akryl kopolymerbindere (Ac1, Ac2 og Ac3) som in- neholder det reaktive alkoksysilanmonomeren metakryloksypropyltrimetoksysilan, γ-MPS. Alkok- sysilanet gjennomg ̊ar hydrolyse og ... -
Cuttings-bed Erodibility
(Master thesis, 2022)Transport av borekaks ut av brønnhullet er en viktig del av hver boreoperasjon for å sikre effektivitet og reduksjon av ikke-produktiv tid. Borevæsker fungerer som en rensestrøm eller sveipemiddel i brønnen, væskens ... -
Cuttings-Bed Erosion in Horizontal Wells: Biopolymers Impact and its Rheological Dependence
(Journal article, 2023)Efficient wellbore cleaning in highly deviated and horizontal wells is a challenge, as there are large areas where the cuttings tend to be deposited. Insufficient wellbore cleaning could cause major operational problems ... -
Data-Driven Control Strategies: From MPC to Reinforcement Learning
(Doctoral theses at NTNU;2024:42, Doctoral thesis, 2024)This thesis presents a comprehensive investigation into the integration of machine learning techniques to enhance the performance and applicability of Model Predictive Control (MPC). The main focus is on addressing challenging ... -
Data-driven modelling of subsea equipment degradation using simulated and experimental case studies
(Master thesis, 2021)I all industri finnes det visse essensielle komponenter som utsettes for slitasje fra flere ulike kilder. I denne oppgaven studeres spesifikt erosjonen fra sand i den sakalte stru- ˚ peventilen (”choke valve”) i et subsea ... -
Data-Driven Robust Optimal Operation of Thermal Energy Storage in Industrial Clusters
(Peer reviewed; Journal article, 2020)Industrial waste heat recovery is an attractive option having the simultaneous benefits of reducing energy costs as well as carbon emissions. In this context, thermal energy storage can be used along with an optimal operation ... -
Data-driven Scenario Selection for Multistage Robust Model Predictive Control
(Journal article; Peer reviewed, 2018)A main assumption in many works considering multistage model predictive control (MPC) is that discrete realizations of the uncertainty are chosen a-priori and that the scenario tree is given. In this work, we focus on ... -
Data-Driven Virtual Flow Metering using Neural Networks
(Master thesis, 2022)Forutsigelse av strømningshastighet er en avgjørende prosess i olje- og gassindustrien, spesielt der flerfasestrømmer er involvert. Det finnes noen få metoder for å vurdere flerfasestrømningshastigheter som imidlertid er ... -
Deactivation of Co-Based Fischer−Tropsch Catalyst by Aerosol Deposition of Potassium Salts
(Journal article; Peer reviewed, 2018)A 20%Co/0.5%Re/γAl2O3 Fischer−Tropsch catalyst was poisoned by four potassium salts (KNO3, K2SO4, KCl, and K2CO3) using the aerosol deposition technique, depositing up to 3500 ppm K as solid particles. Standard characterization ... -
Deactivation of cobalt based Fischer-Tropsch synthesis catalysts
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:304, Doctoral thesis, 2011) -
Decoding atomic-level structures of the interface between Pt sub-nanocrystals and nanostructured carbon
(Journal article; Peer reviewed, 2018)Gaining an insight into the interface structure resulting from the interaction between metal nanoparticles and their supports, particularly under relevant reaction conditions, has been an important topic in heterogeneous ... -
Decomposition of nitrosamines in aqueous monoethanolamine (MEA) and diethanolamine (DEA) solutions with UV-radiation
(Journal article; Peer reviewed, 2014)CO2 capture based on chemical absorption using amine solutions is considered to be the most feasible way to remove CO2 from low pressure sources. However, amines, when exposed to nitrous oxides, may form nitrosamines which ... -
Decoupling the effect of membrane thickness and CNC concentration in PVA based nanocomposite membranes for CO2/CH4 separation
(Journal article; Peer reviewed, 2018)The effect of the viscosity of the casting suspension on membrane morphology and thickness has been investigated for polyvinyl alcohol (PVA)/crystalline nanocellulose (CNC) nanocomposite membranes used for CO2/CH4 separation. ... -
Decrystallization of Lignocellulosic Biomass using Ionic Liquids
(Master thesis, 2012)This thesis is written in fulfilment of the requirements for a Master in Science at the Norwegian University of Science and Technology (NTNU), Department of Chemical Engineering. The work investigates the effectiveness of ... -
Deep Reinforcement Learning in Real-Time Optimization
(Master thesis, 2022)Forsterkningslæring er et område innen maskinlæring som tiltrekker seg oppmerksomhet grunnet egenskaper til å løse komplekse problemer. Læring gjennom å prøve-og-feile er den grunnleggende idéen, der problemet formuleres ... -
Degradation and corrosion inhibitors for MEA-based CO2 capture plants
(Journal article; Peer reviewed, 2016)In amine based post-combustion CO2 capture and storage, solvent degradation and corrosion of steel materials are the main operational challenges. In this paper the focus was on minimizing degradation and corrosion by ... -
Degradation behaviour of fresh and pre-used ethanolamine
(Peer reviewed; Journal article, 2023)The oxidative degradation of previously used ethanolamine from three different CO2 capture pilot plants was studied in a laboratory-scale degradation setup. Different solvents behave differently under the same experimental ...