Chemical Engineering & Technology

Cover image for Vol. 38 Issue 9

Early View (Online Version of Record published before inclusion in an issue)

Impact Factor: 2.442

ISI Journal Citation Reports © Ranking: 2014: 33/134 (Engineering Chemical)

Online ISSN: 1521-4125

Associated Title(s): Chemie Ingenieur Technik, ChemBioEng Reviews, Energy Technology

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  1. Research Articles

    1. Microwave-Assisted Methyl Ester Production from Palm Fatty Acid Distillate over a Heterogeneous Carbon-Based Solid Acid Catalyst

      Ibrahim M. Lokman, Umer Rashid and Yun Hin Taufiq-Yap

      Article first published online: 4 SEP 2015 | DOI: 10.1002/ceat.201500265

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      For biodiesel production from palm fatty acid distillate as feedstock a microwave-pulse width modulation batch reactor with controlled temperature and power was constructed. Under optimized conditions, microwave irradiation enabled an eight-fold faster esterification rate compared to the conventional heating techniques, a higher yield of fatty acid methyl esters, and reduced production cost.

    2. Metallic Honeycombs as Catalyst Supports for Methanation of Carbon Dioxide

      David Schlereth, Philipp J. Donaubauer and Olaf Hinrichsen

      Article first published online: 4 SEP 2015 | DOI: 10.1002/ceat.201400717

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      Preferable heat transfer properties make metallic honeycombs an attractive catalyst support for highly exothermic reactions. By reactor modeling, the methanation of carbon dioxide is studied and model predictions are compared to the ones of fixed-bed reactors. Influencing parameters on the reactor performance are elucidated and limiting transport processes are assessed.

    3. ReDrop – A Simulation Tool for the Design of Extraction Columns Based on Single-Drop Experiments

      José Ayesterán, Nicole Kopriwa, Florian Buchbender, Murat Kalem and Andreas Pfennig

      Article first published online: 4 SEP 2015 | DOI: 10.1002/ceat.201500097

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      The design of extraction columns can be greatly enhanced in ease and accuracy with the introduction of Monte-Carlo simulations to solve drop-population balances using models with system-specific parameters, which can be obtained through single-drop lab cells. The program ReDrop was developed based on this principle and it has already been validated for several column types.

    4. Sequential Modeling of Heavy Liquid Fuel Combustion in a Fluidized Bed

      Azadeh Yousefifar, Rahmat Sotudeh-Gharebagh, Navid Mostoufi and Seyed Saeid Mohtasebi

      Article first published online: 3 SEP 2015 | DOI: 10.1002/ceat.201400464

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      A simple sequential and multisection model combines several ideal reactors to provide a realistic model for combustion of heavy liquid fuel in a fluidized-bed reactor. The model takes into account reactions and hydrodynamic phenomena occurring inside the fluidized bed and is applicable for simulation of nonideal fluidized-bed combustors in industrial process simulators.

    5. Time-Resolved Fluorescence HPLC Detection Using Semiconductor Light Sources: Principles and Applications

      Stephan Landgraf

      Article first published online: 31 AUG 2015 | DOI: 10.1002/ceat.201500152

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      Commercial systems for simultaneous static and time-resolved fluorescence detection in HPLC systems to date employ simple intensity detection in fluorescence systems with very low sensitivity. A first prototype with a nearly practical setup for use with commercial HPLC systems has been built with a laser diode as excitation source. The application is patent-pending.

    6. Fluid Dynamics of Droplets as a Useful Tool to Determine Coverage and Adsorption Kinetics of Surfactants

      Niklas Paul, Joschka M. Schulz and Matthias Kraume

      Article first published online: 31 AUG 2015 | DOI: 10.1002/ceat.201500137

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      In many industrial applications, interfacially active substances like surfactants may adsorb at the liquid-liquid interface and interfere with transport processes. The fluid dynamic behavior of single droplets was evaluated for the determination of interfacial coverages and as a qualitative and highly reproducible tool to measure the adsorption kinetics of surfactants.

  2. Communications

    1. Determination of Particle Size Distributions in Multiphase Systems Containing Nonspherical Fluid Particles

      Robert P. Panckow, Giorgio Comandè, Sebastian Maaß and Matthias Kraume

      Article first published online: 28 AUG 2015 | DOI: 10.1002/ceat.201500123

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      The effect of operating conditions on the bubble size distribution in an aerated stirred vessel measured by a photo-optical device was studied. Approaching the in situ detection of complexly shaped particles with motile boundaries, a variation of the amount of surface-active auxiliaries was performed to show capabilities and limitations by increasing the complexity of the situation.

  3. Research Articles

    1. Power Draw and Gas-Liquid Mass Transfer Characteristics of a Stirred-Tank Reactor with Draft Tube Configuration

      Juergen Lueske, Kishore Kar, Luciano Piras and Jim Pressler

      Article first published online: 28 AUG 2015 | DOI: 10.1002/ceat.201500071

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      Power draw, mixing, liquid circulation, and gas-liquid oxygen transfer were characterized in a large vessel equipped with a draft tube and a mechanical agitation system. The draft tube agitation system is shown to provide a better volumetric mass transfer coefficient compared to the conventional down-pumping system, in addition to a lower holdup, a lower k-factor, and lower-vibration operation.

    2. Effects of Surfactants on Mass Transfer from Single Carbon Dioxide Bubbles in Vertical Pipes

      Jiro Aoki, Kosuke Hayashi, Shigeo Hosokawa and Akio Tomiyama

      Article first published online: 28 AUG 2015 | DOI: 10.1002/ceat.201500063

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      To investigate the effects of surfactants, mass transfer rates, kL, of single CO2 bubbles rising through contaminated water in vertical pipes are measured. The Hatta number plays a key role in interfacial distribution of surfactant, on which kL strongly depends. A kL correlation applicable to fully contaminated ellipsoidal and Taylor bubbles is proposed.

    3. Continuous Synthesis and Thermal Elimination of Sulfinyl-Route Poly(p-Phenylene Vinylene) in Consecutive Flow Reactions

      Neomy Zaquen, Evelien Baeten, Joke Vandenbergh, Laurence Lutsen, Dirk Vanderzande and Thomas Junkers

      Article first published online: 28 AUG 2015 | DOI: 10.1002/ceat.201400754

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      Direct synthesis of conjugated poly(p-phenylene) vinylene materials in microfluidic reactors is targeted. Continuous synthesis of multistep polymerizations is achieved by coupling two microstructured chip reactors in a single reactor setup. This approach marks a significant step in the evolution of polymer reaction design in microstructured flow reactors in general.

    4. Numerical Simulation of Wetting Phenomena with a Phase-Field Method Using OpenFOAM®

      Xuan Cai, Holger Marschall, Martin Wörner and Olaf Deutschmann

      Article first published online: 17 AUG 2015 | DOI: 10.1002/ceat.201500089

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      A phase-field method for interface resolving numerical simulations of two-phase flows is presented and implemented in OpenFOAM®. The method is validated for several capillary flows with moving contact lines and is used to study dynamic droplet spreading on a flat surface by three-dimensional simulations with adaptive mesh refinement near the interface.

    5. Process Intensification Tools in the Small-Scale Pharmaceutical Manufacturing of Small Molecules

      Aleksandar Mitic and Krist V. Gernaey

      Article first published online: 29 MAY 2015 | DOI: 10.1002/ceat.201400765

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      Promising tools for accelerating slow chemical reactions in organic synthesis in order to achieve process intensification are reviewed with the focus on microwave radiation, meso-scale tubular reactors, microreactors, and ultrasounds. Applications of such tools for producing small molecules in the pharmaceutical industry are discussed and illustrated with examples.

    6. Nafion-H-Catalyzed High-Temperature/High-Pressure Synthesis of a Triarylmethane in Continuous-Flow Mode

      Stephan Hayden, Toma Glasnov and C. Oliver Kappe

      Article first published online: 10 MAR 2015 | DOI: 10.1002/ceat.201400581

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      Friedel-Craft reactions are important types of C–C bond-forming reactions. Here, the synthesis of triarylmethanes from aromatic aldehydes and benzene using the super acid Nafion-H as the catalyst is evaluated under both batch and continuous-flow conditions. Using high-temperature/high-pressure conditions, excellent reaction yields are obtained within a few minutes reaction time.

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