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Project Report Beneficiary No.17 ICPF Reporting period: Months 13 to 24 (01 June 2010 to 31 May 2011)
Křišťál, Jiří ; Stavárek, Petr ; Jiřičný, Vladimír
To assess the commercially available SO2 oxidation catalyst and select several for further testing we performed the extensive literature review. Based on that, we tested the selected catalysts for SO2 oxidation in experiments with the KIT lab microreactor, and started the detailed catalyst comparison based on the evaluation of the pre-exponential factor (A0) and activation energy (EA) calculated from the kinetic model by fitting the experimental data. To verify the possible design of a new sulph(on)ation reactor we performed the initial hydrodynamic experiments with gas-liquid two-phase flow in small channels.
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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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