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Porovnání měření zádrže kapaliny ve zkrápěném reaktoru metodou vážení a metodou stopovací látky
Stavárek, Petr ; Staněk, Vladimír ; Jiřičný, Vladimír
This study compares experimental results of liquid holdup in the trickle bed reactor (TBR) measured by two different methods: The tracer method and the column weighting method. These methods were investigated in the trickle bed reactor irrigated by organic liquid. Residence time distribution in liquid phase was measured using a tracer monitored by digital refractometer. Values of the mean residence time necessary for liquid holdup evaluation were obtained from the first statistical moment of the residence time distribution curve. The evaluated liquid holdup data were compared with the liquid holdup data obtained by weighting method on the same laboratory apparatus.
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Studium promíchávání ve zkrápěném reaktoru
Bártová, D. ; Jakeš, B. ; Jiřičný, Vladimír ; Kukal, J. ; Staněk, Vladimír ; Stavárek, Petr
Evaluation of axial dispersion flow parameters in trickle bed reactor (TBR) is presented in this contribution. Four axial dispersion models were employed to identify principal flow parameters (mean residence time, Peclet number and transport delay) from experimental data. The impulse-response method was employed to measure the residence time distribution (RTD) in the liquid phase. Isobutanol was chosen as a suitable tracer for the selected liquid phase represented by toluene. Tracer concentration at the outlet from the reactor was continuously monitored by a digital refractometer. Optimal model and the best predictions of the parameters were obtained via non-linear regression and least square method.
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Liquid Holdup in Hydrogenation Trickle Bed Reactor
Stavárek, Petr ; Jiřičný, Vladimír ; Staněk, Vladimír ; Hanika, Jiří ; Lederer, J. ; Tukač, V.
Experimental study of liquid holdup in trickle bed reactor with organic liquid is presented. On-line column weighting method was employed for liquid holdup measurements. Liquid holdup was measured in wide range of gas and liquid flow rates covering film and pulse flow regime. Porous and nonporous bed packing was used. Measured liquid holdup values were in good agreement with the predictions of empirical correlation from literature. Presented results are a part of the project New operational methods of trickle bed reactors – intensification and safe control supported by Ministry of Industry and Trade of the Czech Republic (grant no. MPO FT-TA/039).
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Unsaturated Hydrocarbons Hydrogenation in Trickle Bed Reactor during Periodic Feed Rate Modulation.
Chyba, V. ; Tukač, V. ; Handlová, M. ; Hanika, Jiří ; Sazanov, Z. ; Lederer, J. ; Kolena, J. ; Jiřičný, Vladimír ; Stavárek, Petr ; Staněk, Vladimír ; Kubička, D. ; Kubičková, I.
Effects of following feed rate modulation parameters on styrene and dicyclopentadiene hydrogenation in toluene and pyrolysis gasoline were investigated in pilot plant experiments: period length, its split, liquid feed rate and liquid rich to liquid poor period parts ratio. The catalyst deactivation was investigated too. Pilot plant results indicated 10% higher trickle bed reactor throughput by application of periodic feed rate modulation in comparison to steady state operation regime.
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CFD Model of Pyrolysis Gasoline Hydrogenation in Trickle Bed Reactor.
Tukač, V. ; Handlová, M. ; Hanika, Jiří ; Chyba, V. ; Sazanov, Z. ; Lederer, J. ; Kolena, J. ; Jiřičný, Vladimír ; Stavárek, Petr ; Staněk, Vladimír
Paper proposes hierarchic structure of mathematical models of pyrolysis gasoline hydrogenation in trickle bed reactor using egg-shell type catalyst. Model dimensions cover an interval from 3 mm of catalyst pellet diameter over a string of several catalyst pellets trickled by reaction mixture to finaly pilot plant trickle bed reactor of diameter 100 mm. Hydrodynamics, transport phenomena and chemical reaction kinetics were desribed by differential balances which were solved by a finite difference method using COMSOL Multiphysics software.
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Pyrolysis Gasoline Hydrogenation in Trickle Bed Reactor with Periodically Modulated Feed Rate.
Tukač, V. ; Hanika, Jiří ; Chyba, V. ; Handlová, M. ; Sazanov, Z. ; Lederer, J. ; Kolena, J. ; Jiřičný, Vladimír ; Stavárek, Petr ; Staněk, Vladimír
The effect of feed rate modulation on efficiency of pilot plant trickle bed reactor during pyrolysis gasoline hydrogenation using palladium supported catalyst was investigated. Enhancement factors for unsaturated hydrocarbon components were evaluated from experiments made both in steady state and dynamic operation modes. Feed rate modulation mode prefered hydrogenation of minority components of the feed.
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