Search results for: Albert Renken

Items from 1 to 20 out of 67 results

chapter

Microstructured Reactors for Heterogeneous Catalytic Processes

Albert Renken

Springer Series in Chemical Physics > Basic Principles in Applied Catalysis > Catalytic Reaction Engineering > 521-542

Microstructured reactors are mainly characterized by their very high surface to volume ratio compared to traditional chemical reactors. Multichannel microreactors having channel diameters in the order of ten to several hundred micrometers have specific surface areas up to 50’000 m²/m³. This value is roughly two orders of magnitude higher compared to conventional production vessels. Due to the...

chapter

Chemical Reaction Engineering Aspects for Heterogenized Molecular Catalysts

Albert Renken

Catalysis by Metal Complexes > Heterogenized Homogeneous Catalysts for Fine Chemicals Production > 247-282

Homogeneous catalysts are characterized by high selectivity and reactivity under mild operating conditions. But the separation of the molecular catalysts from the reaction medium is a serious drawback and hampers industrial applications. A promising way to facilitate the separation and the reuse of the catalysts is its immobilization in a second liquid phase or on a solid support. In any case a mass...

article

Activated carbon fibers for efficient VOC removal from diluted streams: the role of surface morphology

Guillaume B. Baur, Igor Yuranov, Albert Renken, Lioubov Kiwi-Minsker

Adsorption > 2015 > 21 > 6-7 > 479-488

The effect of the micropore structure of activated carbon fibers (ACFs) on the adsorption of toluene at low concentration (10–80 ppmv) was studied over two types of ACFs. Both adsorbents presented similar surface chemistry but different porous structure: one ACF was ultramicroporous (d _pore < 1 nm) and the other supermicroporous (d _pore ~1 to 2 nm). Toluene adsorption isotherms were determined...

article

Intensification of highly exothermic fast reaction by multi-injection microstructured reactor

Julien Haber, Bo Jiang, Thomas Maeder, Navid Borhani, more

Chemical Engineering & Processing: Process Intensification > 2014 > 84 > Complete > 14-23

Microstructured reactors (MSR) with characteristic dimensions below 100μm are warranted to maintain close to isothermal conditions when carrying out quasi-instantaneous highly exothermic reactions. Unfortunately, such small dimensions increase the risk of clogging, create high pressure drop and are costly to number-up. The multi-injection (MI) MSR, where one of the reactants is added stepwise along...

chapter

Heterogeneous Multiphase Reactions

Madhvanand N. Kashid, David W. Agar, Albert Renken, Lioubov Kiwi‐Minsker

Micro Process Engineering > Fuel Processing > 395 - 440

This chapter contains sections titled: Introduction General Criteria for Reactor Choice and Design Fluid–Solid Reactors Fluid–Fluid Reactors Three‐phase Reactions Conclusion References

book

Micro Process Engineering

Volker Hessel, Albert Renken, Jaap C. Schouten, Jun‐Ichi Yoshida, more

This three-volume handbook provides an overview of the key aspects of micro process engineering. Volume 1 covers the fundamentals, operations and catalysts, volume 2 examines devices, reactions and applications, with volume 3 rounding off the trilogy with system, process and plant engineering. Fluid dynamics, mixing, heat/mass transfer, purification and separation microstructured devices and microstructured...

article

Micro-batch reactor for catching intermediates and monitoring kinetics of rapid and exothermic homogeneous reactions

Madhvanand Kashid, Olivier Detraz, Mireia Santacana Moya, Igor Yuranov, more

Chemical Engineering Journal > 2013 > 214 > Complete > 149-156

The mechanism and kinetics of rapid and exothermic reactions is difficult to study using conventional offline techniques. This paper deals with experimental investigations of highly exothermic and fast model reaction (cyclisation of pseudoionone) using slug flow (micro-batches) microstructured reactor (MSR). The slug flow was obtained using a cross-junction and identifying suitable inert carrier fluid...

article

Kinetic and thermodynamic study of the aqueous Kolbe–Schmitt synthesis of beta-resorcylic acid

Anne-Laure Dessimoz, Charline Berguerand, Albert Renken, Lioubov Kiwi-Minsker

Chemical Engineering Journal > 2012 > 200-202 > Complete > 738-747

Detailed thermodynamic and kinetic study of the aqueous Kolbe–Schmitt synthesis of beta-resorcylic acid has been carried out in a laboratory-scale batch reactor operated under ambient pressure. The dependence of the conversion on partial pressure of carbon dioxide (4×10 ⁻⁴ −1bar), initial concentration of resorcinol (0.4–0.8M), initial concentration of potassium bicarbonate (0.4–6M) and temperature...

article

Gas–liquid and liquid–liquid mass transfer in microstructured reactors

Madhvanand N. Kashid, Albert Renken, Lioubov Kiwi-Minsker

Chemical Engineering Science > 2011 > 66 > 17 > 3876-3897

This article is a comprehensive overview of gas–liquid and liquid–liquid mass transfer in microstructured reactors (MSR). MSR are known to offer high heat and mass transfer rates for two phase systems due to high surface to volume ratio as compared to conventional reactors. The reactions with fast kinetics controlled by mass transfer have been successfully intensified using MSR. The first part of...

article

Cyclization of Pseudoionone to β-Ionone: Reaction Mechanism and Kinetics

Madhvanand N. Kashid, Igor Yuranov, Pauline Raspail, Petra Prechtl, more

Industrial & Engineering Chemistry Research > 2011 > 50 > 13 > 7920 - 7926

article

Influence of Flow Regime on Mass Transfer in Different Types of Microchannels

Madhvanand N. Kashid, Albert Renken, Lioubov Kiwi-Minsker

Industrial & Engineering Chemistry Research > 2011 > 50 > 11 > 6906 - 6914

article

Mixing efficiency and energy consumption for five generic microchannel designs

Madhvanand Kashid, Albert Renken, Lioubov Kiwi-Minsker

Chemical Engineering Journal > 2011 > 167 > 2-3 > 436-443

Mixing is an essential part of chemical processes. In the present work, homogeneous mixing at relatively high throughput for a single microchannel (of 1–18mL/min) was investigated in microchannels with different dimensions, cross sections and mixing elements (with and without structured internal surface). A method based on the Villermaux–Dushman reaction was employed and the intensity of segregation...

chapter

Intensification of Catalytic Process by Micro‐Structured Reactors

Lioubov Kiwi‐Minsker, Albert Renken

Microchemical Engineering in Practice > Applications > 403 - 430

This chapter contains sections titled: Introduction Characteristics of Microstructured Reactors Microstructured Reactors for Heterogeneous Catalytic Reactions Main Design Parameters of Catalytic MSR Conclusions

article

A novel compact reactor for three-phase hydrogenations

Martin Grasemann, Albert Renken, Madhvanand Kashid, Lioubov Kiwi-Minsker

Chemical Engineering Science > 2010 > 65 > 1 > 364-371

A novel reactor based on a bubble column staged by structured catalytic layers with integrated cross flow micro-heat-exchangers (HEX) was designed and tested in the solvent free hydrogenation of 2-methyl-3-butyn-2-ol (MBY) aiming on process intensification. The heat transfer performance of the HEX was determined for both single- and two-phase flow. The reaction side heat transfer coefficient was found...

article

Kinetics of the solvent-free hydrogenation of 2-methyl-3-butyn-2-ol over a structured Pd-based catalyst

Micaela Crespo-Quesada, Martin Grasemann, Natalia Semagina, Albert Renken, more

Catalysis Today > 2009 > 147 > 3-4 > 247-254

The solvent-free selective hydrogenation of 2-methyl-3-butyn-2-ol (MBY) to 2-methyl-3-buten-2-ol (MBE) was studied over a Pd/ZnO structured catalyst and compared to its behavior in water-assisted conditions. The catalytic behavior was correlated with the surface properties of the catalysts which were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The catalyst showed high...

article

Forced periodic temperature cycling of chemical reactions in microstructure devices

Martin Luther, Juergen J. Brandner, Lioubov Kiwi-Minsker, Albert Renken, more

Chemical Engineering Science > 2008 > 63 > 20 > 4955-4961

In this publication, several stainless steel microstructure reactors specially designed to obtain rapid and periodic temperature changes are presented. Different microstructure reactor designs have been manufactured and tested for their thermal behaviour and equally by running a test reaction under stationary and non-stationary temperature conditions. The devices were continuously electrically heated...

article

Three-Phase Catalytic Hydrogenation of a Functionalized Alkyne: Mass Transfer and Kinetic Studies with in Situ Hydrogen Monitoring

Andrea Bruehwiler, Natalia Semagina, Martin Grasemann, Albert Renken, more

Industrial & Engineering Chemistry Research > 2008 > 47 > 18 > 6862 - 6869

article

Liquid–liquid two-phase flow patterns and mass transfer characteristics in rectangular glass microreactors

Anne-Laure Dessimoz, Laurent Cavin, Albert Renken, Lioubov Kiwi-Minsker

Chemical Engineering Science > 2008 > 63 > 16 > 4035-4044

The flow of two immiscible fluids was investigated in rectangular glass microchannels with equivalent diameters of 269 and 400μm. Deionised water, dyed toluene and hexane were selected as probe fluids. Flow patterns were obtained for Y- and T-junction of two micro-channels and monitored by a photo-camera. Volumetric velocities of water and organic phase varied between 1 and 6ml/h. The formation mechanism...

article

Erratum to “Structured catalyst of Pd/ZnO on sintered metal fibers for 2-methyl-3-butyn-2-ol selective hydrogenation” [J. Catal. 251 (2007) 213–222]

Natalia Semagina, Martin Grasemann, Nicolas Xanthopoulos, Albert Renken, more

Journal of Catalysis > 2008 > 255 > 1 > 138

article

Hydrodynamics of a Bubble Column Reactor Staged with Sintered Metal Fiber Catalyst for Continuous Three-Phase Hydrogenation

Martin Grasemann, Natalia Semagina, Albert Renken, Lioubov Kiwi-Minsker

Industrial & Engineering Chemistry Research > 2007 > 46 > 25 > 8602 - 8606

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INFONA - science communication portal

Search results for: Albert Renken

Microstructured Reactors for Heterogeneous Catalytic Processes

Chemical Reaction Engineering Aspects for Heterogenized Molecular Catalysts

Activated carbon fibers for efficient VOC removal from diluted streams: the role of surface morphology

Intensification of highly exothermic fast reaction by multi-injection microstructured reactor

Heterogeneous Multiphase Reactions

Micro Process Engineering

Micro-batch reactor for catching intermediates and monitoring kinetics of rapid and exothermic homogeneous reactions

Kinetic and thermodynamic study of the aqueous Kolbe–Schmitt synthesis of beta-resorcylic acid

Gas–liquid and liquid–liquid mass transfer in microstructured reactors

Cyclization of Pseudoionone to β-Ionone: Reaction Mechanism and Kinetics

Influence of Flow Regime on Mass Transfer in Different Types of Microchannels

Mixing efficiency and energy consumption for five generic microchannel designs

Intensification of Catalytic Process by Micro‐Structured Reactors

A novel compact reactor for three-phase hydrogenations

Kinetics of the solvent-free hydrogenation of 2-methyl-3-butyn-2-ol over a structured Pd-based catalyst

Forced periodic temperature cycling of chemical reactions in microstructure devices

Three-Phase Catalytic Hydrogenation of a Functionalized Alkyne: Mass Transfer and Kinetic Studies with in Situ Hydrogen Monitoring

Liquid–liquid two-phase flow patterns and mass transfer characteristics in rectangular glass microreactors

Erratum to “Structured catalyst of Pd/ZnO on sintered metal fibers for 2-methyl-3-butyn-2-ol selective hydrogenation” [J. Catal. 251 (2007) 213–222]

Hydrodynamics of a Bubble Column Reactor Staged with Sintered Metal Fiber Catalyst for Continuous Three-Phase Hydrogenation

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