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Three Phase Catalytic Hydrogenation in Falling Film Microreactor
Stavárek, Petr ; de Bellefon, C.
This study is dedicated to experimental study and modeling of the Falling Film Microreactor Large (FFMR-Large) which has been developed by the Institut für Mikrotechnik in Mainz (IMM). FFMR-Large was tested by performing catalytic hydrogenation of nitrobenzene on Pd/Al2O3 wall coated catalyst to give information about overall reactor performance. The effect of different operation conditions as pressure and liquid feed rate was studied. The reactor performance is compared with results of reactor mathematical model, and results of nitrobenzene hydrogenation in FFMR-Standard published in literature. Reactor modeling is focused on three possible operating regimes with different rate limiting step: 1. chemical reaction is rate limiting, 2. hydrogen diffusion in liquid film is rate limiting and 3. competitive hydrogen diffusion and chemical reaction control.
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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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Bed Reactor, Part IV, Final Research Report, Task C and G, Project FT-TA/039, 2007
Jiřičný, Vladimír ; Staněk, Vladimír ; Stavárek, Petr ; Vychodilová, Hana ; Vlček, Dalibor ; Karfík, David ; Tukač, V. ; Chyba, V. ; Lederer, J. ; Kolena, J. ; Kubička, D. ; Hanika, Jiří
The results of the research of hydrogenation reaction running in Trickle bed reactor (TBR) under condition of steady state or periodic pulse modulation of liquid feed are presented in the report. The effect od pulse period and split on reaction conversion including optimal operation conditions was determined. Yhe extensive hydrodynamic study of TBR was conducted and judged in terms of pressure drop profiles along the catalytic layer, liquid hold up and residence time distribution. Results of hydrodynamic study confirm determination of optimal operating conditions related to maximum conversion.
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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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Transition Phenomena in Trickle Bed Reactor, Part IV, Intermediate Research Report, Task C, Project FT-TA/039, 2007
Jiřičný, Vladimír ; Staněk, Vladimír ; Hanika, Jiří ; Vychodilová, Hana ; Stavárek, Petr ; Vlček, Dalibor ; Karfík, David ; Tukač, V. ; Chyba, V. ; Lederer, J. ; Kubička, D.
This report sumarizes project results obtained from December 10th 2006 to July 31st 2007. Working team effort was concentraced on residence time distribution measurement by refractometric method in laboratory trickle bed reactor with organic liquid. Method was tested giving reproducible results.
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