• Formation of calcium naphthenate in water/oil systems, naphthenic acid chemistry and emulsion stability 

      Havre, Trond Erik (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 ...
    • Structural studies of LWC paper coating layers using SEM and image analysis techniques 

      Chinga, Gary (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 ...
    • Coalescence and Break-Up of Drops and Bubbles 

      Hagesæther, Lars (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 ...
    • Modeling and Experimental Study of Carbon Dioxide Absorption in a Membrane Contactor 

      Hoff, Karl Anders (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 ...
    • Absorption of Carbon Dioxide - Modeling and Experimental Characterization 

      Poplsteinova, Jana (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 ...
    • Operation and feasibility of batch hetero-azeotropic distillation 

      Skouras-Iliopoulos, Efstathios (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 ...
    • Preparation and Characterization of Nanosized Structures with Applications in Bioscience and Materials 

      Glomm, Wilhelm Robert (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 

      Bruaseth, Ingvild (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 ...
    • Catalytic isomerization of light alkanes 

      Løften, Thomas (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 ...
    • Methods for Paper Structure Characterisation by Means of Image Analysis 

      Holmstad, Rune (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 ...
    • Process Integration Applied to the Design and Operation of Distillation Columns 

      Engelien, Hilde Kathrine (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 ...
    • Interfacial (o/w) Properties of Naphthenic Acids and Metal Naphthenates, Naphthenic Acid Characterization and Metal Naphthenate Inhibition 

      Brandal, Øystein (Doktoravhandlinger ved NTNU, 1503-8181; 2005:119, Doctoral thesis, 2005)
      Deposition of metal naphthenates in process facilities is becoming a huge problem for petroleum companies producing highly acidic crudes. In this thesis, the main focus has been towards the oil-water (o/w) interfacial ...
    • Stabilizing control and controllability. Control solutions to avoid slug flow in pipeline-riser systems 

      Storkaas, Espen (Doktoravhandlinger ved NTNU, 1503-8181; 2005:97, Doctoral thesis, 2005)
      Riser slugging is a flow regime that can occur in multiphase pipeline-riser systems, and is characterized by severe flow and pressure oscillations. The irregular flow caused by riser slugging can cause large operational ...
    • Fischer-Tropsch synthesis over cobalt supported catalysts 

      Storsæter, Sølvi (Doktoravhandlinger ved NTNU, 1503-8181; 2005:134, Doctoral thesis, 2005)
      The following catalysts have been studied by different characterization techniques and by kinetic experiments at FT conditions: 12 % Co/γ-Al2O3, 12 % Co - 0.5 % Re/γ-Al2O3, 12 % Co/SiO2, 12 % Co - 0.5 % Re/SiO2, 12 % Co/TiO2 ...
    • Microstructured reactors for hydrogen production 

      Aartun, Ingrid (Doktoravhandlinger ved NTNU, 1503-8181, Doctoral thesis, 2005)
      Small scale hydrogen production by partial oxidation (POX) and oxidative steam reforming (OSR) have been studied over Rh-impregnated microchannel Fecralloy reactors and alumina foams. Trying to establish whether metallic ...
    • Steam Reforming of Methane on Different Nickel Catalysts 

      Christensen, Kjersti Omdahl (Doktoravhandlinger ved NTNU, 1503-8181; 2005:46, Doctoral thesis, 2005)
      The effect of crystal size on carbon formation and sintering was studied on nickel catalysts at steam reforming conditions. Different nickel supported catalysts were examined. As support three commercial hydrotalcites were ...
    • Synthesis of Carbon Nanofibers and Carbon Nanotubes 

      Yu, Zhixin (Doktoravhandlinger ved NTNU, 1503-8181; 2005:18, Doctoral thesis, 2005)
      Carbon nanofibers (CNFs) and carbon nanotubes (CNTs) have attracted intense research efforts with the expectation that these materials may have many unique properties and potential applications. The most promising way for ...
    • Studies on selection of controlled variables 

      Alstad, Vidar (Doktoravhandlinger ved NTNU, 1503-8181; 2005:91, Doctoral thesis, 2005)
      Increased competition in the process industries requires optimal operation and better utilization of raw materials and energy. One strategy for achieving improved production is to use real-time optimization (RTO), based ...
    • Selection and Characterization of New Absorbents for Carbon Dioxide Capture 

      Ma'mun, Sholeh (Doktoravhandlinger ved NTNU, 1503-8181; 2005:156, Doctoral thesis, 2005)
      Removal of acidic gases, in particular CO2, is an important industrial operation. Carbon dioxide is produced in large quantities by fossil–fuel–fired power plants, steel production, the production of petrochemicals, cement ...
    • Gas Heated Steam Reformer Modelling 

      Wesenberg, Margrete Hånes (Doktoravhandlinger ved NTNU, 1503-8181; 2006:77, Doctoral thesis, 2006)
      Conversion of natural gas is becoming increasingly relevant in the future as the world energy market will demand cleaner fuels, cleaner production of fuels and better utilization of the large, remote, and still undiscovered ...