Blar i Institutt for kjemisk prosessteknologi på tittel
Viser treff 1469-1488 av 1767
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Shape selectivity in acidic zeolite catalyzed 2-pentene skeletal isomerization from first principles
(Journal article; Peer reviewed, 2018)Periodic density functional theory (DFT) calculations have been performed to examine the monomolecular reaction mechanism for 2-pentene skeletal isomerization catalyzed by acidic zeolite Beta, Mordenite, and ZSM-5. The use ... -
Should we forget the Smith Predictor?
(Journal article; Peer reviewed, 2019)The PI/PID controller is the most used controller in industry. However, for processes with large time delays, the common belief is that PI and PID controllers have sluggish performance, and that a Smith predictor or similar ... -
Shut in and Restart of Waxy Crude Oil Pipelines: Gelation, Rheology Model Development, and Application of Polymer/Ionic Liquid Based Additive
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:278, Doctoral thesis, 2013)The processes of shut in and restart of waxy crude oil pipelines are important for crude oil flow assurance strategies. During the flow shut in process at low temperature, strong gel may form in the waxy crude oil pipelines. ... -
SiC supported Co catalysts for the Fischer-Tropsch synthesis
(Master thesis, 2012)With rising crude oil prices and outlook of declining crude oil production, conversion of natural gas into liquid fuels is gaining worldwide interest. Fischer-Tropsch synthesis is an important tool in achieving this ... -
Significance of C3 Olefin to Paraffin Ratio in Cobalt Fischer–Tropsch Synthesis
(Peer reviewed; Journal article, 2020)The ratio between propene and propane (C3 o/p) during Fischer–Tropsch synthesis (FTS) has been analyzed based on both literature reports and experiments for five catalysts. The latter comprise four cobalt catalysts on ... -
Signs of alkylcarbonate formation in water-lean solvents: VLE-based understanding of pKa and pKs effects
(Peer reviewed; Journal article, 2021)Water-lean solvents are solvents for CO2 capture which contain at least one amine and one organic diluent. Carbamate-forming amines in nonaqueous water-lean solvents typically absorb CO2 through the formation of carbamate ... -
Silica-modified bismutite nanoparticles for enhanced adsorption and faster solar photocatalytic degradation of methylene blue
(Peer reviewed; Journal article, 2023)Herein, we report the synthesis of silica-modified self-assembled structures of bismutite (BSC) through a facile hydrothermal route. The incorporation of silica into the hybrid led to improved adsorption of cationic methylene ... -
Silver catalyst surface changes in structure and chemical intercation in various oxygen-containing reactive atmospheres.
(Master thesis, 2023)Formaldehyd kan produseres gjennom forskjellige ruter, med sølvprosessen som en av dem. Under denne prosessen produseres CO2, CO og H2 fra bireaksjoner. I tillegg gjennomgår overflatestrukturen til sølvkatalysatoren en ... -
Simple and Robust Formulations of the Unscented Kalman Filter and Model Predictive Control
(Doctoral theses at NTNU;2024:93, Doctoral thesis, 2024)This thesis focuses mainly on state estimation by the Unscented Kalman filter (UKF), and partly on robust nonlinear model predictive control (RNMPC). Our aim is to refine or develop algorithms which are simple to implement, ... -
A simple dynamic optimization-based approach for sizing thermal energy storage using process data
(Peer reviewed; Journal article, 2023)Thermal energy storage (TES) can increase waste heat utilization in district heating (DH) by storing excess energy to be used later to compensate for energy deficit. When sizing a TES tank for DH, incorporating operational ... -
Simple implementation of optimal control for process systems
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:217, Doctoral thesis, 2010)The main focus of this thesis is to find simple ways of implementing optimal operation of process plants. The work is in the spirit of “self-optimizing control”, which can be summarized as [Skogestad, 2000b]: “The goal ... -
Simple method for parameter identification of a nonlinear Greitzer compressor model
(Journal article; Peer reviewed, 2018)This work introduces a simple method to estimate state variables and identify parameters of a nonlinear dynamic Greitzer compressor model. The observer is based upon an extended Kalman filter, which estimates the dynamic ... -
The Simple Solution for Nonlinear State Estimation of Ill-Conditioned Systems: The Normalized Unscented Kalman Filter
(Journal article; Peer reviewed, 2023)An easy-to-implement method for nonlinear state estimation for ill-conditioned systems is proposed. By propagating standard deviations and correlations instead of the covariance in the unscented Kalman filter (UKF), the ... -
Simple Well-Model Based on Basic Physical Principles
(Master thesis, 2013)To reduce loss, real-time optimization (RTO) is today used in most petroleum industry. Minimizing loss is achieved by avoiding over- or underutilization of the production system, and keeping the process as close to the ... -
A Simplification Procedure for Distillation Tray Models
(Master thesis, 2018)The popularity of liquid separation by distillation in the industry has resulted in a wide range of distillation models. These models range from detailed flow models used in the design of trays and packings, to models ... -
Simplified First-Principles Model of a Compact Flotation Unit for Use in Optimization and Control
(Journal article; Peer reviewed, 2019)In this paper, we develop a simplified control-oriented model of a compact flotation unit (CFU), which removes residual oil from produced water in oil and gas production systems. CFU is a class of separators that exploits ... -
Simulation and Analysis of RNA Polymerase Motion on the DNA
(Master thesis, 2018)RNA Polymerase is an enzyme that is frequently used to clone genetic material. However, backtracking seems to turn the process remarkably inefficient, because it leads to a lot of waste of raw material, making the cost of ... -
Simulation and Model Verification of the Dynamic and Steady State Behavior of the CO2 Capture Plant at TCM.
(Master thesis, 2015)Post-combustion CO2 capture (PCC) with amines is the most mature technology for CO2 capture, and is considered to be an important part of future carbon capture and storage projects. A dynamic model of a PCC amine plant ... -
Simulation and modelling of hydrogen production by sorption enhanced steam methane reforming in fixed bed reactors
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:80, Doctoral thesis, 2010)An increased demand for hydrogen as energy-carrier and as fuel for clean power generation is expected during the 21st century. The Kyoto-protocol states that the world has to decrease it’s CO2-emissions to the atmosphere. ... -
Simulation of Chemical Reactors using the Least-Squares Spectral Element method
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:308, Doctoral thesis, 2011)The least–squares spectral element method is a relatively novel method that can be used to solve any well–posed problem. It has been extensively used in computational fluid dynamics, and in recent years has been applied ...