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Hydrodynamic and Heat Transfer Model of a Gas-Liquid Microreactor
Křišťál, Jiří ; Stavárek, Petr ; Staněk, Vladimír ; Jiřičný, Vladimír ; Simoncelli, A. ; Vanhoutte, D. ; Tarchini, R. ; Talford, M. ; Hass-Santo, K. ; Benzinger, W.
In this contribution we present a hydrodynamic and heat transfer model of a microreactor for a gas-liquid reaction. In the course of formulation of the model, we considered the characteristic features of the studied system – the gas-liquid flow pattern and the change in physical properties induced by pressure and temperature variation along the microreactor. Based on the input information (gas and liquid flow rates, compositions, temperatures), the model calculates the two-phase pressure drop and outlet temperature as the principal result. These results serve as a basis for the design of an intensified pilot scale microreactor.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22012102413550 - PDF
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Liquidation of Brominated Flame Retardants from Waste Water
Vajglová, Zuzana ; Vychodilová, Hana ; Kotas, Petr ; Jiřičný, Vladimír
In this work we focused on the degradation method with a high potential for degradation of polybrominated diphenyl ethers from liquid waste. Very good results were achieved with the chemical degradation methods using nanostructured iron. Electrochemical method gave the best results of degradation of PBDE. Within the frame of this work we have used for the first time an electrochemical microreactor whose application in this context has not been described in the literature. The obtained original experimental results confirm the significantly higher efficiency and speed of degradation in comparison with the classic electrochemical reactor and chemical methods of PBDE degradation.
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Modular Microsystems for Novel Processes Research
Křišťál, Jiří ; Jiřičný, Vladimír ; Hanika, Jiří
Paper summarises results of ICPF AS CR team in application of micro-devices including microreactors for research of novel chemical processes. Experiences were reached during the international projects IMPULSE and F3 FACTORY solved in the 6th and 7th Framework Program EU. Novel chemical processes development for chemical specialties supports their higher purity. This trend represents great challenge for chemical engineers. The piece of knowledge was applied also during discussions on Strategic Research Agenda and Implementation Action Plan formulations by the Czech Technology Platform for Sustainable Chemistry founded at the Association of Chemical Industry of the Czech Republic.
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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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Development of Bipolar Electrochemical Microreactorfor Organic Synthesis
Jiřičný, Vladimír ; Vychodilová, Hana ; Melich, Z. ; Kodým, R. ; Bystroň, T. ; Bouzek, K.
Extensive theoretical and experimental study of electrochemical alkoxylation has been conducted in frame of large EU The new electrochemical project IMPULSE (2005-9). New high conversion high selectivity one pass bipolar electrochemical microreactor has been developed in cooperation with other partners: ICTP CR, IMM Germany, Solvent Innovation Germany and CNRS Nancy France. New design and process parameters enable significant reduction of expenses on separation of the product from reaction mixture. Experimental results and design of industrial reactor size has been presented in the contribution.
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