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NMR as a tool to follow destabilization of water-in-oil emulsions
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:216, Doctoral thesis, 2011)Due to depletion of conventional sources and increasing demand for crude oil, the last years have shown a shift towards the exploitation of heavier and technologically more difficult feedstocks. This shift of focus means ... -
NMR Speciation of Aqueous MAPA, Tertiary Amines, and Their Blends in the Presence of CO2: Influence of pKa and Reaction Mechanisms
(Journal article; Peer reviewed, 2018)The diamine 3-(methylamino)propylamine (MAPA) and eight tertiary amines were studied as single and blended aqueous CO2 absorbents at different concentrations and ratios to investigate their reaction mechanisms. After ... -
NO oxidation catalyzed by high surface area perovskites
(Master thesis, 2018)The production of nitric acid is crucial for the production of fertilizer which is necessary to meet the world s demand for food. NO oxidation is one of three chemical steps in the nitric acid production, also called the ... -
NO til NO2 oksidasjon over koboltoksider på bærere
(Master thesis, 2019)Flertallet av salpetersyrebehovet går til produksjon av ammoniumnitrater, som brukes i produksjon av gjødsel. Produksjon av salpetersyre benytter Ostwald prosessen, hvor en av de tre reaksjonstrinnene er oksidasjonen av ... -
Noble Metal Promoted CoMn Catalysts for Fischer-Tropsch Synthesis
(Journal article; Peer reviewed, 2018)Noble metal (Pt, Re and Ru) promoters were investigated for Fischer–Tropsch synthesis at light olefin favouring conditions over Co–Mn catalysts. Characterisation and testing found promotion to increase catalyst activity ... -
A Non-Autonomous Relativistic Frame of Reference for Unit Operation Design
(Peer reviewed; Journal article, 2020)This contribution presents an efficient systematic algorithm for unit operation design that uses a newly developed non-autonomous relativistic frame of reference (NARF). The NARF is aimed towards the conceptual design of ... -
Non-linear dependency of wax appearance temperature on cooling rate
(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 ... -
Non-linear rheology and direct numerical simulation of pressure propagation in gel
(Dr. ingeniøravhandling, 0809-103X; 2014:175, Doctoral thesis, 2014)Complex fluids are expected to demonstrate rheological behavior intermediate between solids (completely elastic) and fluids (completely viscous). However, despite abundant existence of complex fluids their rheological ... -
Nonlinear Model Predictive Control and Dynamic Real-Time Optimization of Semi-Batch Reactors - A Case Study of Expandable Polystyrene Production
(Master thesis, 2018)The aim of this thesis was to develop an advanced two-layer control structure for the semi-batch polymerization of expandable polystyrene (EPS) that minimizes the batch time while still producing a set polymer quality and ... -
Nonlinear model predictive control of a multi-absorber CO2 capture plant
(Master thesis, 2021)I et etterforbrenning karbonfangstanlegg blir det brukt en aminløsning for å absorbere CO2. Aminløsningen blir regenerert i desorberkolonnen gjennom varme tilført i omkokeren. En stor driftskostnad ved et karbonfangstanlegg ... -
Nonlinear model predictive control of a semi-batch reactor for miniemulsion polymerization of vinyl chloride monomer
(Master thesis, 2023)Målet med denne avhandlingen var å implementere og teste ulineær modellbasert prediktiv regulering (NMPC) på en semi-batch reaktor for en miniemulsjonspolymerisasjonsprosess. Motivasjonen bak arbeidet i denne avhandlingen ... -
Nonlinear Model Predictive Control of Gravity Separators
(Master thesis, 2017)For economical reasons, it is necessary to operate separators such that the the purity specification is maximized while having the levels and the system pressure controlled. In this thesis, a nonlinear model predictive ... -
Nonlinear model-based control of two-phase flow in risers by feedback linearization
(Journal article, 2013)Active control of the production choke valve is the recommended solution to prevent severe slugging flow conditions at offshore oilfields. The slugging flow constitutes an unstable and highly nonlinear system; the gain of ... -
Nonlinear modeling and control for an evaporator unit
(Journal article; Peer reviewed, 2018)This article presents a nonlinear modeling approach describing the enthalpy dynamics between the inlet of the economizer and the outlet of the evaporator in a once-through boiler. The model is used to design an LQG controller ... -
Nonsmooth Modelling of Multiphase Multicomponent Heat Exchangers with Phase Changes
(Master thesis, 2018)Developing proper and consistent dynamic models of processes with phase changes can be challenging. Appearance and disappearance of phases result in changes in the system equations and is not known a priori. Dynamic models ... -
A Norwegian steam explosion biorefinery
(Chapter, 2023) -
Novel Alginate Complex-derived Fe Catalysts for Sustainable Lower Olefin Production: Fischer-Tropsch Synthesis Based on Renewable Feedstocks
(Doctoral theses at NTNU;2022:310, Doctoral thesis, 2022) -
Novel Approaches in Robust Multistage Nonlinear Model Predictive Control
(Doctoral theses at NTNU;2021:51, Doctoral thesis, 2021)A powerful tool that has been widely used for control and optimization in the chemical process industry is model predictive control (MPC), thanks to its capacity for handling multivariable constrained control problems. ... -
Novel Approaches to Online Process Optimization Under Uncertainty: Addressing the limitations of current industrial practice
(Doctoral theses at NTNU;2019:301, Doctoral thesis, 2019)In the face of growing competition and increased necessity to focus on sustainability and energy efficiency, there is a clear need to optimize the day-to-day operation of many industrial processes. This involves online ... -
A Novel CO2 Capture and Utilization Strategy by Enzyme Catalysis: Preliminary Assessment of Process Layout
(Peer reviewed; Journal article, 2022)Catalytic conversion of CO2 into fuels and valuable chemicals has gained large attention in the scientific and industrial research aimed at developing novel Carbon Capture and Utilization (CCU) processes. Among current ...