Institutt for kjemisk prosessteknologi
Recent Submissions
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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 ... -
Water-lean solvents for biogas upgrading
(Doctoral theses at NTNU;2020:298, Conference object, 2020)Biogas upgrading consists in the removal of CO2 from biogas, a process which produces a highly purified biomethane stream. As such, biogas upgrading has a double positive impact when considering climate change mitigation ... -
Carbon hollow fiber membranes for a molecular sieve with precise-cutoff ultramicropores for superior hydrogen separation
(Peer reviewed; Journal article, 2021)Carbon molecular sieve (CMS) membranes with rigid and uniform pore structures are ideal candidates for high temperature- and pressure-demanded separations, such as hydrogen purification from the steam methane reforming ... -
Cellulose nanofibrils as rheology modifiers and stabilizers in food systems
(Doctoral theses at NTNU;2020:291, Doctoral thesis, 2020)Food additives are components used in many food products to improve qualities such as flavor, appearance or texture. In low-fat and non-fat food products, food additives called fat-replacers are added to the food products ... -
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 ... -
Effect of Low-Molecular-Weight Alcohols on Emulsion Stabilization with Lignosulfonates
(Peer reviewed; Journal article, 2020)Lignosulfonates are biobased surfactants and specialty chemicals, which are described as water-soluble polyelectrolyte macromolecules that are generated during the sulfite pulping of lignocellulose biomass. Due to their ... -
Lignosulfonate Salt Tolerance and the Effect on Emulsion Stability
(Peer reviewed; Journal article, 2020)In this article, we adapted and compared methods to assess lignosulfonates for technical applications. Salt-induced agglomeration and precipitation were studied via mechanical separation and subsequent UV spectrometry. The ... -
Effect of Hydrophobic Iron Oxide Nanoparticles on the Properties of Oil-Based Drilling Fluid
(Peer reviewed; Journal article, 2020)Lately, nanoparticles (NPs) have shown the potential to improve the performance of oil well fluids significantly. Several studies have reported the ability of NPs to produce improved properties of both water and oil-based ... -
Solubility of Carbon Dioxide, Hydrogen Sulfide, Methane, and Nitrogen in Monoethylene Glycol; Experiments and Molecular Simulation
(Peer reviewed; Journal article, 2020)Knowledge on the solubility of gases, especially carbon dioxide (CO2), in monoethylene glycol (MEG) is relevant for a number of industrial applications such as separation processes and gas hydrate prevention. In this study, ... -
Preparation of Carbon Molecular Sieve Membranes with Remarkable CO2/CH4 Selectivity for High-pressure Natural Gas Sweetening
(Peer reviewed; Journal article, 2020)Carbon hollow fiber membranes (CHFMs) were fabricated based on cellulose hollow fiber precursors spun from a cellulose/ionic liquid system. By a thermal treatment on the precursors using a preheating process before ... -
Single Drop Breakage in Turbulent Flow: Statistical Data Analysis
(Peer reviewed; Journal article, 2020)To improve breakage models in the population balance framework, single octanol droplet experiments have been performed in a channel flow and recorded by high-speed camera. The study investigates impact of mother drop size ... -
Lignosulfonates in Crude Oil Processing: Interactions with Asphaltenes at the Oil/Water Interface and Screening of Potential Applications
(Peer reviewed; Journal article, 2020)The goal of this article is to test the potential application of lignosulfonates (LSs) in crude oil production and processing. Three LS samples of varying hydrophobicity and average molecular weight were considered. First, ... -
Microfluidic testing of flocculants for produced water treatment: Comparison with other methodologies
(Peer reviewed; Journal article, 2020)Flocculants are often added during produced water treatment to improve the crude oil droplet growth and separation from the water phase. Prior to use in the field, their performance is tested in laboratory conditions, ... -
Active sites for the oxygen reduction reaction in nitrogen-doped carbon nanofibers
(Journal article; Peer reviewed, 2019)Understanding the role of iron and the nature of the active sites in nitrogen-doped carbon nanomaterials is vital for their future application as oxygen reduction electrocatalysts in fuel cells. In this paper, porphyrin-like ... -
Systematic design of active constraint switching using se-lectors.
(Peer reviewed; Journal article, 2020)Selector logic is a simple and effective tool to switch between different controlled variables associated with change in active constraints. Selector blocks have been extensively used in the process control industry for ... -
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 ... -
Synergy between chemical demulsification and electrocoalescence: From bench to large scale
(Doctoral theses at NTNU;2020:64, Doctoral thesis, 2020)Production of crude oil from reservoirs always contain additional fluids, namely formation water and gas that occur naturally below the surface or seabed. Especially problematic is the water that becomes dispersed within ... -
Viscoelastic properties of interfacial lignosulfonate films and the effect of added electrolytes
(Peer reviewed; Journal article, 2020)New evidence is presented, which confirmed interfacial gelling of lignosulfonates in presence of di- and trivalent cations. In this article, the viscoelastic properties of lignosulfonate films at the water-xylene interface ... -
Fundamental properties of nanocelluloses, and teir application in membranes for CO2 Separation
(Doctoral theses at NTNU;2019:146, Doctoral thesis, 2019) -
Spectroscopic study of partially oxidized BN nanoscrolls induced by low frequency ultrasonic radiation
(Journal article; Peer reviewed, 2020)In comparison to carbon nanostructures, hexagonal boron nitride (hBN) nanostructures show better biocompatibility and lower cytotoxicity. However, research studies on hBN nanostructures for biomedical applications are still ...
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