Browsing Institutt for kjemisk prosessteknologi by Issue Date
Now showing items 21-40 of 1777
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Coalescence and Break-Up of Drops and Bubbles
(Dr. ingeniøravhandling, 0809-103X; 2002:25, Doctoral thesis, 2002)Fluid particle break-up and coalescence are important phenomena in a number of industrial processes. A Lagrangian momentum balance model for the collision process between two fluid particles has been developed and tested ... -
Kinetic and Deactivation Studies of Hydrodesulfurization Catalysts
(Dr. ingeniøravhandling, 0809-103X; 2002:148, Doctoral thesis, 2002)Hydrodesulfurization is an important part of the hydrotreating process. More stringent regulations on the quality of fuels bring new requirements to the catalytic processes. The removal of sulfur has become a key issue in ... -
Formation of calcium naphthenate in water/oil systems, naphthenic acid chemistry and emulsion stability
(Dr. ingeniøravhandling, 0809-103X; 2002:127, Doctoral thesis, 2002)In recent years the production of crude oils with high amounts of naphthenic acids has increased. Certain problems are related to this type of crudes and a better understanding of the chemistry of the naphthenic acids is ... -
Oxygen-assisted conversion of propane over metal and metal oxide catalysts
(Dr. ingeniøravhandling, 0809-103X; 2002:48, Doctoral thesis, 2002) -
Structural studies of LWC paper coating layers using SEM and image analysis techniques
(Dr. ingeniøravhandling, 0809-103X; 2002:14, Doctoral thesis, 2002)The ever rising need for detailed knowledge of the structure of paper coating urges the improvement and development of new techniques for gaining new and valuable information. The assessment, study and characterisation of ... -
Characterisation of crude oil components, asphaltene aggregation and emulsion stability by means of near infrared spectroscopy and multivariate analysis
(Doctoral thesis, 2002)Effective separation of water-in-crude oil emulsions is a central challenge for the oil industry on the Norwegian Continental Shelf, especially with the future increase in subsea and even down-hole processing of well-fluids. ... -
Influence of asphaltene aggregation and pressure on crudeoil emulsion stability
(Doktoravhandlinger ved NTNU, 1503-8181; 81, Doctoral thesis, 2002)Water-in-crude oil emulsions stabilised by various surface-active components are one of the major problems in relation to petroleum production. This thesis presents results from high-pressure separation experiments on ... -
Synergy Effects between Polyethylene and high Density Papers in Gas Barrier Materials - a Morphological Study
(Dr. ingeniøravhandling, 0809-103X; 2002:39, Doctoral thesis, 2002)This work has its origin in efforts to optimise the barrier properties of packaging materials in which polyethylene extrusion coated high-density paper constitute the oxygen barrier. Examples of applications where this ... -
Migration of Plasticizers from Flexible Poly/(Vinyl Chloride)
(Dr. ingeniøravhandling, 0809-103X; 2002:117, Doctoral thesis, 2002)The migration of plasticizers from flexible PVC products has caused raising concern over the last decades. Phthalates are shown to induce certain types of cancer and damages to the reproductive system in rodents. It is ... -
Gasskraftverk med CO2-håndtering - Studie av alternative teknologier
(Research report, 2002)Rapporten dokumenterer en studie som beskriver og sammenligner 12 ulike teknologier for gasskraftverk med CO2-håndtering. Merkostnaden for å fjerne CO2 i forbindelse med elektrisitetproduksjon er i studien beregnet til ... -
Modeling and Experimental Study of Carbon Dioxide Absorption in a Membrane Contactor
(Dr. ingeniøravhandling, 0809-103X; 2003:27, Doctoral thesis, 2003)Membrane gas absorption is a new way of contacting gas and liquid for industrial scale gas purification and offers significant advantages compared to conventional absorption towers. Due to the separation of the phases by ... -
Oxidative Dehydrogenation of Ethane and Propane at Short Contact Time
(Dr. ingeniøravhandling, 0809-103X; 2003:4, Doctoral thesis, 2003)Olefins are important intermediates for many industrial processes and the demand for olefins is forecasted to grow for the next years. One of the promising alternative routes for the production of olefins is oxidative ... -
Model studies of secondary hydrogenation in Fischer-Tropsch synthesis studied by cobalt catalysts
(Doktoravhandlinger ved NTNU, 1503-8181; 2003:29, Doctoral thesis, 2003)Mass transfer effects are very important in Fischer-Tropsch (FT) synthesis. In order to study the FT synthesis without the influence of any transport limitations, cobalt foils have been used as model catalysts. The effect ... -
Process Integration Applied to the Design and Operation of Distillation Columns
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:24, Doctoral thesis, 2004)Process integration of distillation columns with focus on multi-effect distillation is studied in this thesis. Columns are integrated by using different pressures, so that the condensing duty of one column can be used to ... -
Operation and feasibility of batch hetero-azeotropic distillation
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:47, Doctoral thesis, 2004)Separation of azeotropic mixtures is of great industrial importance and distillation is the dominating unit operation for such separations. However, the presence of azeotropes and non-idealities in the phase behaviour of ... -
Methods for Paper Structure Characterisation by Means of Image Analysis
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:98, Doctoral thesis, 2004)Paper is a complex, disordered porous media. The complexity makes it difficult to obtain more than empirical knowledge of the relationship between papermaking variables and the resulting paper structural properties. It is ... -
Preparation and Characterization of Nanosized Structures with Applications in Bioscience and Materials
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:82, Doctoral thesis, 2004)The so-called bottom-up approach to the fabrication of nanostructures from stable building blocks has become a popular theme in current science and engineering. This construction principle mimics e.g. biological systems ... -
Towards Tailoring of Ethene/1-Hexene Copolymers by Dual-Site Metallocene Catalysis
(Dr. ingeniøravhandling, 0809-103X; 2003:108, Doctoral thesis, 2004)Mixing of different metallocene catalysts is a method that can be used to tailor the polymer properties in one reactor. This work deals with the tailoring of ethene/1-hexene copolymers by use of dual-site metallocene ... -
Absorption of Carbon Dioxide - Modeling and Experimental Characterization
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:16, Doctoral thesis, 2004)Recent studies on the costs of different processes for CO2 capture from power plants show that post-combustion CO2 removal by absorption with chemical solvents has the potential to remain the most important process also ... -
Catalytic isomerization of light alkanes
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:160, Doctoral thesis, 2004)In recent years the levels of sulfur and benzene in the gasoline pool have been reduced, and in the future there may also be new regulations on vapor pressure and the level of aromatics and olefins as well. The limitations ...