Browsing Institutt for kjemisk prosessteknologi by Title
Now showing items 1570-1589 of 1765
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Subsea Natural Gas Treatment Using Membranes: Experimental and Modeling Study
(Doctoral theses at NTNU;2020:367, Doctoral thesis, 2020)Subsea natural gas reservoirs are usually saturated with water vapor and impurities such as CO2 and H2S, which are the main contributors to the pipeline blockage, hydrate formation, and corrosion. Dehydration is usually ... -
Subsea regeneration of triethylene glycol (TEG) for natural gas dehydration.
(Master thesis, 2017)The scope of this thesis was to examine the use of pervaporation technology with membranes for the regeneration of triethylene glycol (TEG) in natural gas dehydration. To reduce the need for offshore installations, subsea ... -
Subsea Separation and Water Injection at Luno II - Conceptual Design and Control Assessment
(Master thesis, 2017)Subsea separation and water re-injection give rise to production from oil fields earlier considered economically unfit and give a longer production life to existing fields. This thesis addresses the design of a subsea ... -
Super selective ammonia separation through multiple-site interaction with ionic liquid-based hybrid membranes
(Peer reviewed; Journal article, 2021)Efficient separation and recovery of ammonia (NH3) is essential for environmental protection and resource utilization. In this work, hybrid membranes for NH3 separation through multiple-site interaction were developed by ... -
Superstructure Optimization of Early Stage Offshore Oil Field Development with Subsea Processing
(Master thesis, 2018)The oil and gas industry has been subject to a series of challenges during the last couple of decades, including increased water depths, step-out distances and harsher environmental and operational conditions. This has ... -
Superstructure optimization of subsea processing layouts
(Journal article; Peer reviewed, 2023)As the oil and gas industry expands the use of subsea processing, the complexity of subsea layouts increases, making manual design processes cumbersome and suboptimal. Here we propose a method to support subsea field design ... -
Supported Manganese Oxide Catalysts for NO Oxidation in Nitric Acid Production
(Master thesis, 2018)Nitric acid is an important bulk chemical in the petrochemical industry, and the main product is ammonium nitrate for fertilizers. It is produced by the Ostwald process, where one of three chemical steps is the oxidation ... -
Surface Modified γ-Alumina Supports For Cobalt Fischer-Tropsch Catalysts
(Master thesis, 2015)Fischer-Tropsch synthesis over cobalt based catalysts is an important route for the conversion of syngas, derived from natural gas, to liquid fuels. Fischer-Tropsch performance of cobalt catalysts depends on a number of ... -
Surface phase diagrams of La-based perovskites towards the O-rich limit from first principles
(Journal article; Peer reviewed, 2019)The exposed termination of transition-metal oxide surfaces plays a major role in determining the catalyst performance in redox reactions. In this contribution, the surface phase diagrams of LaMO3(001) (M = Sc–Fe) and ... -
Surrogate Model Development for an Ammonia Synthesis Process
(Master thesis, 2017)In this thesis, a surrogate model is aimed to be constructed for the separation-refrigeration (S-R) section in the ammonia plant. First, the variables defining the process are classified by input variables and output ... -
Surrogate model generation using self-optimizing variables
(Journal article; Peer reviewed, 2018)This paper presents the application of self-optimizing concepts for more efficient generation of steady-state surrogate models. Surrogate model generation generally has problems with a large number of independent variables ... -
Surrogate modelling of VLE: Integrating machine learning with thermodynamic constraints
(Peer reviewed; Journal article, 2020)An easy-to-implement methodology to develop accurate, fast and thermodynamically consistent surrogate machine learning (ML) models for multicomponent phase equilibria is proposed. The methodology is successfully applied ... -
Sustainable and Atomically Dispersed Iron Electrocatalysts Derived from Nitrogen- and Phosphorus-Modified Woody Biomass for Efficient Oxygen Reduction
(Journal article; Peer reviewed, 2019)Development of low‐cost, efficient, and robust electrocatalysts to replace precious platinum catalysts for oxygen reduction reaction (ORR) is urgent to boost the applications of green energy devices such as fuel cells and ... -
Sustainable electrocatalysts for oxygen reduction reaction: M-N-P (M: transition metals) doped mesoporous carbon from biomass
(Doctoral theses at NTNU;2018:72, Doctoral thesis, 2018) -
Swelling and Free-Volume Characteristics of TEMPO-Oxidized Cellulose Nanofibril Films
(Journal article; Peer reviewed, 2018) -
Swelling of individual cellulose nanofibrils in water, role of crystallinity: an AFM study
(Peer reviewed; Journal article, 2020)Atomic force microscopy (AFM) can be used to quantitatively study nanomaterials in different media, e.g. vacuum, air, or submerged in a liquid. A technique was developed to study swelling of individual cellulose nanofibrils ... -
Symbolic Differentiation of Multivariable Functions to Arbitrary Order
(Master thesis, 2013)Thermodynamic properties, like pressure, volume and temperature can be calculated as partial derivatives of energy functions. Obtaining analytic partial derivatives can be tedious work. Computer algebra systems can be used ... -
Symplectic integration of a one-dimensional Hamiltonian system of permanent magnets oscillating in a gravitational field. - A mechanical analogue to a thermodynamic system.
(Master thesis, 2014)The objective of this work was to analyze a mechanical analogue to a thermodynamic system. The main goal was to investigate the temperature distribution in a vertical system of oscillating magnets in a gravitational field ... -
Synergistic Adsorption of Polyaromatic Compounds on Silica Surfaces Studied by Molecular Dynamics Simulation
(Journal article; Peer reviewed, 2018)Adsorption on silica surfaces of polyaromatic compounds, N-(1-hexylhepyl)-N′-(5-carboxylicpentyl)-perylene-3,4,9,10-tetracarboxylic bisimide (C5Pe) and N-(1-undecyldodecyl)-N′-(5-carboxylicpentyl)-perylene-3,4,9,10-tetracarboxylic ... -
Synergistic Effect of Bimetallic MOF Modified Separator for Long Cycle Life Lithium-Sulfur Batteries
(Journal article; Peer reviewed, 2023)Severe polysulfide dissolution and shuttling are the main challenges that plague the long cycle life and capacity retention of lithium-sulfur (Li-S) batteries. To address these challenges, efficient separators are designed ...