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  • TP155-156  (16)
  • KIT Scientific Publishing  (16)
  • English  (16)
  • 2020-2024  (16)
  • 1955-1959
  • 1950-1954
Collection
Keywords
Publisher
Language
Years
  • 2020-2024  (16)
  • 1955-1959
  • 1950-1954
Year
  • 1
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    Coating and drying processes for functional films in polymer solar cells - from laboratory to pilot scale (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Polymer solar cells can be produced by a continuous low cost coating and drying process. This work details a specialized experimental set-up to enable large scale roll to roll processing. Material properties such as surface energy, surface tension, and viscosity are presented and modelled. The impact of coating method, as well as process parameters (e.g. coating speed, shear rate, solvent composition) on process stability and film properties, is discussed.
    Keywords: TP155-156 ; Viscosity ; ViskositätPolymer solar cell ; Polymersolarzelle ; Organic Electronic ; Beschichtung ; Organische Elektronik ; Prozess ; Process ; Coating ; Trocknung ; Drying ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 2
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    Catalytic soot oxidation by platinum on sintered metal filters. Influence of the platinum quantity, particle size and location, and investigation of the platinum-soot contact (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The great challenge for next years concerning the emission of diesel engines is to develop diesel particle filters (DPF) with catalytic regeneration systems. This work is focused on the global understanding of the diesel soot oxidation on sintered metal filters (SMF). Platinum is studied as reference catalyst. The first objective is to determine which of platinum quantity, platinum particle size, or platinum location exhibits the preponderant influence on the catalytic.
    Keywords: TP155-156 ; platinum ; soot ; catalytic oxidation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 3
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    Combining Fischer-Tropsch Synthesis (FTS) and Hydrocarbon Reactions in one Reactor (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The present study addresses the combination of low-temperature Fischer-Tropsch synthesis (FTS) and hydrocarbon modification reactions (hydroprocessing) in one reactor. The objective of the present investigation was to study the influence of CO during hydroprocessing reactions of hydrocarbon model compounds on two different bifunctional catalysts. In addition, the influence of the catalyst-bed configuration for the combination FTS and hydrocarbon reactions was investigated.
    Keywords: TP155-156 ; Pt/Beta ; Fischer-Tropsch synthesis ; catalyst-bed configuration ; hydroprocessing ; physical mixture ; bifunctional catalysts ; dual layer ; Pt/ZSM-5 ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 4
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    Partial oxidation of Raffinate II and other mixtures of n-Butane and n-Butenes to maleic anhydride in a fixed-bed reactor (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The utilisation of the C4 streams of steamcrackers by converting raffinate II to maleic anhydride was studied. The oxidation reactions were investigated in a laboratory-scale fixed-bed reactor to determine reaction kinetics. The effects of pore diffusional resistance were investigated and explained. A two-dimensional pseudo-homogeneous reactor model was used for the simulation of a production-scale fixed-bed reactor. A flow scheme of the reactor section including a recycle was proposed.
    Keywords: TP155-156 ; Reaction Kinetics ; Partial Oxidation ; Raffinate II ; Reactor Simulation ; Maleic Anhydride ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 5
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    Screening and description of novel hydantoinases from distinct environmental sources (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Various bacteria with hydantoinase activity were recovered from terrestrial soil samples of different geographic origins (Antarctica, South Africa, China). Based on these findings it is shown that microorganisms with hydantoinase activity are (i) distributed in various geographically distinct environmental habitats (ii) distributed worldwide (iii) found in certain bacterial genera.
    Keywords: TP155-156 ; Delftia ; Bacillus ; enzyme characterisation ; hydantoinase ; halophile ; Ochrobactrum ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 6
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    Influence of fully miscible lubrication oil on flow boiling of CO? inside horizontal evaporator tubes (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Flow boiling heat transfer, pressure drop and flow pattern of CO?-POE oil mixtures were experimentally investigated in smooth and micro-fin tubes. The POE oil used features full miscibility in the range of operation investigated. The experimental data was evaluated based on mixture properties, used to evaluate and improve established predictive methods. The knowledge obtained contributes to understanding the influence of oil, which is essential for achieving an efficient evaporator design.
    Keywords: TP155-156 ; Strömungssieden CO? Kältemaschinenöl ; flow boiling CO? lubricant ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 7
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    Vacuum gas carburizing - fate of hydrocarbons (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: This work focuses on gaseous reactive flows in ideal and non-ideal reactors. The objective of this research is the development of models for the numerical simulation of homogeneous reactive flows under vacuum carburizing conditions of steel with propane and acetylene. These models can be used for further investigations of heterogeneous reactions during vacuum carburizing of steel to predict the carbon flux on the complex shaped steel parts to understand and, eventually, optimize the behavior of the whole reactor.arburizing is the case-hardening process in which carbon is added to the surface of low-carbon steels at temperatures generally between 850 and 1050 °C. In the conventional gas carburizing at atmospheric pressure, the carbon potential is controlled by adjusting the flow rate of the carburizing gas. Carbon potential of the furnace atmosphere can be related to partial pressure of CO2 or O2 or vapour pressure of water by equilibrium relationships and a sensor can be used to measure it. This method of carbon-potential control cannot be used for vacuum gas carburizing due to the absence of thermodynamic equilibrium which is one of the main difficulties of the vacuum carburizing process. The formation of soot during carburization isalso undesirable and the process parameters should be selected such that the formation of soot is minimized. The amount of carbon available for carburizing the steel depends on the partial pressure of the carburizing gas, carbon content in the carburizing gas and the pyrolysis reactions of the carburizing gas. The pyrolysis reactions of the carburizing gas are also affected by the contacting pattern or how the gas flows through and contacts with the steel parts being carburized. This work focuses on gaseous reactive flows in ideal and non-ideal reactors. The objective of this research is the development of models for the numerical simulation of homogeneous reactive flows under vacuum carburizing conditions of steel with ropane and acetylene. These models can be used for further investigations of heterogeneous reactions during vacuum carburizing of steel to predict the carbon flux on the complex shaped steel parts to understand and, eventually, optimize the behavior of the whole reactor. Two different approaches have been used to model the pyrolysis of propane and acetylene under vacuum carburizing conditions of steel. One approach is based on formal or global kinetic mechanisms together with the computational fluid dynamics (CFD) tool. The other approach is based on detailed chemistry with simplified or ideal flow models. Two global mechanisms developed at the Engler-Bunte-Institut for pyrolysis of propane and acetylene respectively were used in this work. One detailed mechanism developed at the Institute of Chemical Technology by the research group of Professor Deutschmann was used for modeling the pyrolysis of both the propane and acetylene. Experimental data from investigations on vacuum carburizing conducted at the Engler-Bunte-Institut were used to validate the modeling results.
    Keywords: TP155-156 ; carburizing ; gaseous reactive flows ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 8
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    In-situ H2O removal via hydorphilic membranes during Fischer-Tropsch and other fuel-related synthesis reactions (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The general objective of this thesis was to explore the potential of in-situ H2O removal during fuel-related synthesis reactions with focus on in-situ H2O removal by hydrophilic membranes and by chemical reaction. It is demonstrated that in-situ H2O removal through vapour permeation during CO2 hydrogenation to Fischer-Tropsch hydrocarbons and during DME/DEE synthesis leads to increased conversion and yield levels, which are directly linked to the degree of H2O recovery.
    Keywords: TP155-156 ; Fischer-Tropsch synthesis ; H2O removal ; membrane reactor ; water gas shift reaction ; CO2 hydrogenation ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 9
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    Enzyme reaction engineering for the conversion of emulsified di-rhamnolipid by free and immobilized Naringinase (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: Process optimization was conducted for the conversion of the aggragate-building substrate di-rhamnolipid to mono-rhamnolipid by Alpha-L-rhamnosidase from Penicillium decumbens and resulting in: (I) selection of optimal reaction conditions for enzyme activity and stability, (II) modeling of the reaction time course assuming mixed aggregates as a second phase, and (III) high mass diffusion resistances were completely overcome by the use of non-porous magnetic enzyme micro-carriers.
    Keywords: TP155-156 ; mixed aggregates ; aggregate-building substrate ; Naringinase ; magnetic microbeads ; rhamnolipids ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 10
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    Electrofiltration of Biopolymers : Spatially Distributed Process Analysis (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: In biotechnology the current downstream processing trends are directed towards integrated, faster and more effective processes. Electrofiltration is a hybrid method which is a combination of membrane filtration and electrophoresis in a dead-end process. Spatially distributed process analysis together with the applicability of electrofiltration for technically important biopolymers such as PHB, chitosan and hyaluronic acid enables the implementation of the technology into industry.
    Keywords: TP155-156 ; separation ; process analysis ; biopolymers ; electrofiltration ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 11
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    Sulfur-tolerant natural gas reforming for fuel-cell applications (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: An attractive simplification of PEM-FC systems operated with natural gas would be the use of a sulfur tolerant reforming catalyst, but such a catalyst has not been available thus far. In this work it is demonstrated that a tailor made rhodium catalyst retains useful activity for typical sulfur levels in the feed. A brief economic comparison showed however that this alternative process is still less economical than the traditional process employing removal of sulfur components by adsorption.
    Keywords: TP155-156 ; natural gas ; reforming ; fuel cells ; sulfur ; hydrogen ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 12
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    Process Simulation of Technical Precipitation Processes - The Influence of Mixing (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: This work develops and shows up methods to tackle multi-scale challenges in particle formation during precipitation crystallization. Firstly, molecular, micro- and meso-scale interactions in confined impinging jet mixers are investigated and simulatively predicted. Secondly, to build up on developed methods, macroscale as present for instance in stirred tank reactors is added to the considerations.
    Keywords: TP155-156 ; precipitation ; Vermischung ; Simulation ; computational fluid dynamics ; Fluiddynamik ; mixing ; simulation ; Populationsbilanz ; Fällung ; population balance ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 13
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    Slot die coating of lithium-ion battery electrodes (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The Li-ion battery technology could help to accelerate the transition towards renewable energy sources. In the manufacturing chain, the electrode processing by slot die coating is one of the most crucial steps. Increased line speeds and reduced scrap rates could help decrease these costs. The scope of this work is therefore the scientific elaboration of the process limits of single and subdivided, simultaneous coated multilayer films, a minimizing of edge effects and intermittent coatings.
    Keywords: TP155-156 ; process windows ; coating ; lithium-ion batteries ; Dünnfilmtechnik ; Prozessfenster ; thin film technology ; Beschichtung ; Schlitzguss ; Lithium-ionen BatterienSlot die ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 14
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    Drying, film formation and open time of aqueous polymer dispersions : an investigation of different aspects by rheometry and inverse-micro-raman-spectroscopy (IMRS) (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The application properties and the final coating properties of waterborne polymer dispersions are poor compared to the ones of polymer solutions with organic solvents. This is expressed by a short open time and by inhomogeneities and defects that are visible in the final dry coating.Aim of this work is an investigation and discussion of the different aspects that are responsible for the poor application and coating properties of aqueous latex dispersions by experiments and model calculations.
    Keywords: TP155-156 ; open time ; polymer dispersions ; film formation ; drying ; Raman spectroscopy ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 15
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    Simulation of Turbulent Flows with and without Combustion with Emphasis on the Impact of Coherent Structures on the Turbulent Mixing (2021)
    KIT Scientific Publishing
    Details
    Publication Date: 2024-04-11
    Description: The analysis of turbulent mixing in complex turbulent flows is a challenging task. The effective mixing of entrained fluids to a molecular level is a vital part of the dynamics of turbulent flows, especially when combustion is involved. The work has shown the limitations of the steady-state simulations and acknowledged the need of applying high-fidelity unsteady methods for the calculation of flows with pronounced unsteadiness promoted by large-scale coherent structures or other sources.
    Keywords: TP155-156 ; turbulente Strömungen ; Kohärente Strukturen ; combustion ; turbulent mixing ; coherent structures ; LES ; turbulente Mischung ; Verbrennungturbulent flows ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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  • 16
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    Mass and momentum transfer upon flow through solid sponges (2021)
    KIT Scientific Publishing
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    Publication Date: 2024-04-11
    Keywords: TP155-156 ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TC Biochemical engineering::TCB Biotechnology
    Language: English
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