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Thèses sur le sujet « Mehrphasensystem »

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Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 12 février 2022

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1

Häberle, Stefan. « Multiphase microfluidics on a centrifugal platform / ». Aachen : Shaker, 2008. http://d-nb.info/988194627/04.

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2

Zayed, Firas [Verfasser]. « Friedel-Crafts-Acylierung im Mehrphasensystem ionische Flüssigkeit und überkritisches Kohlendioxid / Firas Zayed ». Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2011. http://d-nb.info/101624391X/34.

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3

Stauch, Rainer. « Detaillierte Simulation von Verbrennungsprozessen in Mehrphasensystemen ». Berlin dissertation.de, 2007. http://www.dissertation.de/buch.php3?buch=5305.

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4

Zaitone, Belal Ali al. « Drying of multiphase single droplets in ultrasonic levitator ». Aachen Shaker, 2009. http://d-nb.info/996545611/04.

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5

Kükrek, Murhat Verfasser], Regina [Akademischer Betreuer] [Palkovits et Markus [Akademischer Betreuer] Rose. « Dehydratisierung von D-Fructose sowie Oxidation von 5-HMF : Möglichkeiten der Prozessintensivierung durch Mehrphasensystem / Murhat Kükrek ; Regina Palkovits, Markus Rose ». Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1187346497/34.

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6

Kükrek, Murhat [Verfasser], Regina [Akademischer Betreuer] Palkovits et Markus [Akademischer Betreuer] Rose. « Dehydratisierung von D-Fructose sowie Oxidation von 5-HMF : Möglichkeiten der Prozessintensivierung durch Mehrphasensystem / Murhat Kükrek ; Regina Palkovits, Markus Rose ». Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1187346497/34.

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7

Stauch, Rainer. « Detaillierte Simulation von Verbrennungsprozessen in Mehrphasensysteme ». Berlin : dissertation.de, 2007. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000007374.

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8

Grenner, Andreas. « Thermodynamische Untersuchungen von Phasengleichgewichten in komplexen Systemen mit assoziierenden Komponenten ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1159379739386-68745.

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The knowledge of phase equilibrium is essential for the planning and realisation of separation processes in chemical engineering. In this work an equipment for measurement of precise isothermal vapour–liquid equilibria (VLE) using the dynamic method was developed. The pool of experimental data for cyclohexylamine was extended significantly. Isothermal VLE were measured in 3 binary and 4 ternary systems, liquid-liquid equilibria (LLE) were measured in 4 ternary systems and in one quarternary system, in each case for two temperatures, whereas in 2 ternary systems and in the quarternary system even liquid-liquid-liquid equilibria (LLLE) occur. Furthermore, activity coefficients at infinite dilution in 4 binary systems and excess molar volumes in 7 binary systems have been estimated. Binary VLE and LLE data of the components water, octane, cyclohexylamine and aniline of this work and data from literature were fitted with the activity coefficient models NRTL and UNIQUAC, as well as with the equations of state Elliott-Suresh-Donohue (ESD) and Perturbed-Chain-Statistical Associating Fluid Theory (PC-SAFT) which contain both a term to consider explicit hydrogen bonds. In addition, the predictive capabilities of the equations of state (EoS) were investigated. With parameters obtained by simultaneous fitting of VLE and, if available, LLE data similar results with the models NRTL and UNIQUAC could be obtained. Each time the deviations for the vapour pressure were lower than 3 % and lower than 2 % in vapour phase composition. The deviations, in three out of the six systems for vapour pressure and vapour phase composition, were larger with the ESD-EoS than with the activity coefficient models. NRTL, UNIQUAC and ESD delivered similar results with the simultaneously fitted parameters for the LLE, whereas the deviations were lower than 5 %. Comparable results were delivered by the ESD-EoS and PC-SAFT for the fitting and the prediction in the investigated binary systems. Also a fitting for NRTL, UNIQUAC and ESD was carried out, but only to one data set. The intention was to show the effect of parameterization on prediction in ternary systems. Predictions were made for VLE and LLE in ternary systems of the above mentioned components, solely with interaction parameters fitted to binary data. For the models NRTL, UNIQUAC und ESD predictions of simultaneously and separately fitted parameters are presented. It is shown that with parameters simultaneously fitted to several data sets significantly better results could be obtained compared to the parameters separately fitted to a single data set. Additionally, for the equations of state ESD and PC-SAFT predictions for the LL(L)E in ternary systems are compared, but here only with separately fitted parameters. For three out of the four investigated ternary systems a too large miscibility gap is calculated with the models NRTL, UNIQUAC and ESD. In the system water+octane+aniline good results could be obtained for the prediction of the LLLE. In summary the equations of state deliver similar results. In the systems water+octane+CHA and octane+CHA+aniline also too large two phase regions were delivered. Better predictions could be obtained in the systems water+octane+aniline and water+CHA+aniline. The forecasts of the VLE in the ternary systems are good with the simultaneously fitted parameters. The deviations for the vapour phase compositions are as for the vapour pressures under 6 %. Larger deviations occur for the system water+octane+aniline only. As evaluation result for the thermodynamic models can be mentioned that the activity coefficient models NRTL and UNIQUAC deliver somewhat better results for the fitting of the binary data than the equations of state ESD and PC-SAFT however, with a larger number of adjustable parameters. The prediction of the VLE is satisfactorily in the ternary systems and with similar quality of all considered models. Larger deviations occur for the prediction of the LL(L)E in the ternary systems. The results of the ESD-EoS were, with one exception, each time better than those of the activity coefficient models. There is no significant difference between the prediction of the ternary systems for the ESD-EoS and the PC-SAFT.
9

Brüggmann, Jan [Verfasser], Heinrich [Akademischer Betreuer] Brakelmann et István [Akademischer Betreuer] Erlich. « Wechselspannungstechnologiebasierte bipolare Mehrphasensysteme / Jan Brüggmann. Gutachter : István Erlich. Betreuer : Heinrich Brakelmann ». Duisburg, 2013. http://d-nb.info/1034029843/34.

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10

Stauch, Rainer [Verfasser], et U. [Akademischer Betreuer] Maas. « Detaillierte Simulation von Verbrennungsprozessen in Mehrphasensystemen / Rainer Stauch ; Betreuer : U. Maas ». Karlsruhe : KIT-Bibliothek, 2007. http://d-nb.info/1186010584/34.

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11

Breitling, Michael [Verfasser]. « Populationsdynamische Modellierung und Simulation von Partikelwechselwirkungen in rotierenden Mehrphasensystemen bei verschiedenen Strömungszuständen / Michael Breitling ». Aachen : Shaker, 2005. http://d-nb.info/118161113X/34.

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12

Hermanns, Thomas [Verfasser], Walter [Akademischer Betreuer] Leitner et Jürgen [Akademischer Betreuer] Klankermayer. « Olefinmetathese von Ölsäuremethylester in Mehrphasensystemen aus ionischen Flüssigkeiten und überkritischem Kohlendioxid / Thomas Hermanns ; Walter Leitner, Jürgen Klankermayer ». Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1127143727/34.

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13

Sawiec, Joanna [Verfasser]. « Darstellung und galenische Eigenschaften von Ein- und Mehrphasensystemen unter Einsatz hypoallergener Emulgatoren aus der Kohlenhydrattensidreihe / Joanna Sawiec ». Aachen : Shaker, 2007. http://d-nb.info/1164340158/34.

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14

Scott, Martin Verfasser], Walter [Akademischer Betreuer] Leitner et André [Akademischer Betreuer] [Bardow. « Homogenkatalysierte Hydrierung von CO₂ zu Ameisensäure und Ameisensäurederivaten in Mehrphasensystemen ‒ Katalysator- und Systementwicklung / Martin Scott ; Walter Leitner, André Bardow ». Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195151594/34.

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15

Westhues, Christian Gerhard [Verfasser], Walter [Akademischer Betreuer] Leitner et Sonja [Akademischer Betreuer] Herres-Pawlis. « Semikontinuierliche homogenkatalysierte Hydrierung von CO$_2}$ und organischen Carbonaten in Mehrphasensystemen : Prozessentwicklung und Anlagendesign / Christian Gerhard Westhues ; Walter Leitner, Sonja Herres-Pawlis ». Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1228432953/34.

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16

Kome, Melvin Njumbe. « Well testing in gas hydrate reservoirs ». Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2015. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-160567.

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Reservoir testing and analysis are fundamental tools in understanding reservoir hydraulics and hence forecasting reservoir responses. The quality of the analysis is very dependent on the conceptual model used in investigating the responses under different flowing conditions. The use of reservoir testing in the characterization and derivation of reservoir parameters is widely established, especially in conventional oil and gas reservoirs. However, with depleting conventional reserves, the quest for unconventional reservoirs to secure the increasing demand for energy is increasing; which has triggered intensive research in the fields of reservoir characterization. Gas hydrate reservoirs, being one of the unconventional gas reservoirs with huge energy potential, is still in the juvenile stage with reservoir testing as compared to the other unconventional reservoirs. The endothermic dissociation hydrates to gas and water requires addressing multiphase flow and heat energy balance, which has made efforts to develop reservoir testing models in this field difficult. As of now, analytically quantifying the effect on hydrate dissociation on rate and pressure transient responses are till date a huge challenge. During depressurization, the heat energy stored in the reservoir is used up and due to the endothermic nature of the dissociation; heat flux begins from the confining layers. For Class 3 gas hydrates, just heat conduction would be responsible for the heat influx and further hydrate dissociation; however, the moving boundary problem could also be an issue to address in this reservoir, depending on the equilibrium pressure. To address heat flux problem, a proper definition of the inner boundary condition for temperature propagation using a Clausius-Clapeyron type hydrate equilibrium model is required. In Class 1 and 2, crossflow problems would occur and depending on the layer of production, convective heat influx from the free fluid layer and heat conduction from the cap rock of the hydrate layer would be further issues to address. All these phenomena make the derivation of a suitable reservoir testing model very complex. However, with a strong combination of heat energy and mass balance techniques, a representative diffusivity equation can be derived. Reservoir testing models have been developed and responses investigated for different boundary conditions in normally pressured Class 3 gas hydrates, over-pressured Class 3 gas hydrates (moving boundary problem) and Class 1 and 2 gas hydrates (crossflow problem). The effects of heat flux on the reservoir responses have been addressed in detail.
17

Wache, Wieland [Verfasser]. « Zur verbesserten Reaktionstechnik von Mehrphasensystemen durch den Einsatz gasgesättigter Flüssigkeiten : Untersuchungen am Beispiel der Fischer-Tropsch-Synthese und der hydrierenden Tiefentschwefelung von leichtem Heizöl / Wieland Wache ». Aachen : Shaker, 2007. http://d-nb.info/1166507785/34.

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18

Höfener, Tobias [Verfasser]. « Katalytische Hydrierung in Mehrphasensystemen auf Basis von Ionischen Flüssigkeiten und Kohlendioxid / vorgelegt von Tobias Höfener ». 2008. http://d-nb.info/992709407/34.

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19

Kome, Melvin Njumbe. « Well testing in gas hydrate reservoirs ». Doctoral thesis, 2014. https://tubaf.qucosa.de/id/qucosa%3A22964.

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Reservoir testing and analysis are fundamental tools in understanding reservoir hydraulics and hence forecasting reservoir responses. The quality of the analysis is very dependent on the conceptual model used in investigating the responses under different flowing conditions. The use of reservoir testing in the characterization and derivation of reservoir parameters is widely established, especially in conventional oil and gas reservoirs. However, with depleting conventional reserves, the quest for unconventional reservoirs to secure the increasing demand for energy is increasing; which has triggered intensive research in the fields of reservoir characterization. Gas hydrate reservoirs, being one of the unconventional gas reservoirs with huge energy potential, is still in the juvenile stage with reservoir testing as compared to the other unconventional reservoirs. The endothermic dissociation hydrates to gas and water requires addressing multiphase flow and heat energy balance, which has made efforts to develop reservoir testing models in this field difficult. As of now, analytically quantifying the effect on hydrate dissociation on rate and pressure transient responses are till date a huge challenge. During depressurization, the heat energy stored in the reservoir is used up and due to the endothermic nature of the dissociation; heat flux begins from the confining layers. For Class 3 gas hydrates, just heat conduction would be responsible for the heat influx and further hydrate dissociation; however, the moving boundary problem could also be an issue to address in this reservoir, depending on the equilibrium pressure. To address heat flux problem, a proper definition of the inner boundary condition for temperature propagation using a Clausius-Clapeyron type hydrate equilibrium model is required. In Class 1 and 2, crossflow problems would occur and depending on the layer of production, convective heat influx from the free fluid layer and heat conduction from the cap rock of the hydrate layer would be further issues to address. All these phenomena make the derivation of a suitable reservoir testing model very complex. However, with a strong combination of heat energy and mass balance techniques, a representative diffusivity equation can be derived. Reservoir testing models have been developed and responses investigated for different boundary conditions in normally pressured Class 3 gas hydrates, over-pressured Class 3 gas hydrates (moving boundary problem) and Class 1 and 2 gas hydrates (crossflow problem). The effects of heat flux on the reservoir responses have been addressed in detail.
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