Chemical Engineering & Technology

Cover image for Vol. 38 Issue 10

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. Mass Transfer from Single Taylor Bubbles in Minichannels

      Sven Kastens, Shogo Hosoda, Michael Schlüter and Akio Tomiyama

      Article first published online: 2 OCT 2015 | DOI: 10.1002/ceat.201500065

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      Insights into mass transfer processes are of great interest in the optimization of production processes. Therefore, mass transfers from single CO2 Taylor bubbles in a downward flow in minichannels with circular and square cross sections were measured. The mass transfer coefficients in the pipes were almost the same as those in the ducts in spite of a large difference in bubble rising velocities.

    2. Kinetics of Catalytic Oxidation of Sulfite in Diluted Aqueous Solutions

      Michal Opletal, Petr Novotný, František J. Rejl, Tomáš Moucha and Michal Kordač

      Article first published online: 2 OCT 2015 | DOI: 10.1002/ceat.201500064

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      A method of partial deoxygenation is developed to circumvent complex liquid recycling during mass transfer measurement in pilot-scale multiphase loop reactors. Apparent kinetic parameters of diluted sodium sulfite oxidation in aqueous solution at high oxygen-to-sulfite ratio are presented. The application of a rapid mixing apparatus for studying very fast reactions is described.

    3. Bubble Mobilization Pressure in a Small-Diameter Tube

      Hiroki Uchiyama, Akira Kariyasaki, Masazumi Kagawa, Yoshikazu Yamasaki, Yosuke Matsukuma and Shigeharu Morooka

      Article first published online: 2 OCT 2015 | DOI: 10.1002/ceat.201500012

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      The dependence of the bubble mobilization pressure in a capillary tube on various factors was experimentally determined for the two cases when the liquid film forming between the bubble surface and the inner surface of the duct covers or does not cover the bubble surface. The mechanism for the motion of the liquid film surrounding the bubbles was evaluated for visualization.

    4. Optimal Control Vector Parameterization Approach with a Hybrid Intelligent Algorithm for Nonlinear Chemical Dynamic Optimization Problems

      Panpan Zhang, Xinggao Liu and Liang Ma

      Article first published online: 2 OCT 2015 | DOI: 10.1002/ceat.201400796

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      An optimal approach that combines control vector parameterization (CVP) with an innovative hybrid algorithm, named HAPSODSA, is proposed for nonlinear chemical dynamic optimization problems. The HAPSODSA- CVP approach proved to be efficient and outperforms both adaptive particle swarm optimization-CVP and particle swarm optimization-CVP approaches.

    5. Comparison of Subgrid Closure Methods for Passive Scalar Variance at High Schmidt Number

      Krzysztof Wojtas, Łukasz Makowski, Wojciech Orciuch and Jerzy Bałdyga

      Article first published online: 2 OCT 2015 | DOI: 10.1002/ceat.201400646

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      The results of large eddy simulation predictions of the passive scalar variance distribution in a T-mixer are shown to be significantly dependent on the closure for the subgrid-scale variance. An additional coefficient for the dynamic model is proposed that takes into account the variation of the turbulence Reynolds number and depends on the Schmidt number and the numerical cell size.

    6. Improving O2/N2 Selective Filtration Using Carbon Nanotube-Modified Mixed-Matrix Membranes

      Sedigheh Zeinali and Mohammad Aryaeinezhad

      Article first published online: 2 OCT 2015 | DOI: 10.1002/ceat.201400538

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      Mixed-matrix membranes consisting of purified/functionalized multi-walled carbon nanotubes and polyethersulfone were designed to achieve O2/N2 selective filtration. The effects of solvent, carbon nanotube type, polymer dosage, casting method, and applied pressure on the membrane performance were investigated. Spin coating was found to be the best casting method for membrane fabrication.

    7. Experimental Study on the Ignition and Extinction Characteristics of the Hydrothermal Flame

      Fengming Zhang, Yong Zhang, Chunyan Xu, Shouyan Chen, Guifang Chen and Chunyuan Ma

      Article first published online: 2 OCT 2015 | DOI: 10.1002/ceat.201300571

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      Prerequisite for fuel injection into a transpiring-wall reactor at room temperature is the formation of the hydrothermal flame. The ignition and extinction characteristics of the hydrothermal flame inside an inner-preheating transpiring-wall reactor, e.g., the ignition and extinction temperatures, are studied. Lower velocities at the nozzle outlet are shown to favor hydrothermal flame stability.

    8. Influence of Bubble-Surface Contamination on Instantaneous Mass Transfer

      Jie Huang and Takayuki Saito

      Article first published online: 29 SEP 2015 | DOI: 10.1002/ceat.201500056

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      Influences of the Marangoni effect, which is induced by the non-uniform distribution of surfactants adsorbed on the bubble surface, on instantaneous mass transfer, bubble's centroid motion, and surface oscillation are discussed based on precise experiment results. The resulting changes in bubble and liquid motions led to a decrease in the mass transfer in contaminated water.

    9. Photodecarboxylations in an Advanced Meso-Scale Continuous-Flow Photoreactor

      Sam Josland, Saira Mumtaz and Michael Oelgemöller

      Article first published online: 29 SEP 2015 | DOI: 10.1002/ceat.201500285

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      Photodecarboxylation of phthalimides was realized under continuous-flow conditions in an advanced meso-scale photoreactor. The improved efficiency, yields and productivities of these photochemical reactions highlight the benefits of using flow versus conventional batch operation modes. Flow chemistry permits an easy combination of multiple reaction steps in series.

    10. Microwave Discharge Electrodeless Lamps. Part VIII: Continuous On-Site Solar Energy Remediation of Contaminated Water

      Satoshi Horikoshi, Tomoki Nishimura, Hideya Tsutsumi and Nick Serpone

      Article first published online: 29 SEP 2015 | DOI: 10.1002/ceat.201500164

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      Microwave discharge electrodeless lamps activated by microwaves from a semiconductor generator were used on-site to treat contaminated water with solar cells providing the electrical power. Such a system is able to degrade relatively high concentrations of organic pollutants and sterilize water contaminated with bacteria on-site in relatively short time.

    11. Photoelectrocatalytic Oxidation of Methyl Orange on a TiO2 Nanotubular Anode Using a Flow Cell

      María José Martín de Vidales, Laura Mais, Cristina Sáez, Pablo Cañizares, Frank C. Walsh, Manuel A. Rodrigo, Christiane de Arruda Rodrigues and Carlos Ponce de León

      Article first published online: 9 SEP 2015 | DOI: 10.1002/ceat.201500085

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      Methyl orange as a model organic dye is removed from wastewaters by photoelectrocatalytic oxidation on a TiO2 nanotubular array-coated anode in a flowing electrolyte cell. The photocatalytic titanium nanotubes produce hydroxyl radicals able to oxidize the organic molecules. Effects of flow rate and applied potential on the removal efficiency are investigated.

    12. Baseline Model for the Simulation of Bubbly Flows

      Roland Rzehak, Eckhard Krepper, Yixiang Liao, Thomas Ziegenhein, Sebastian Kriebitzsch and Dirk Lucas

      Article first published online: 8 SEP 2015 | DOI: 10.1002/ceat.201500118

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      Bubble coalescence and breakup processes are very complex, with so far poorly developed models. In the two-step validation procedure adopted here, measured values are first substituted for the bubble size distribution, and previously qualified models for bubble forces and bubble-induced turbulence are then used without change to assess their validity for bubble coalescence and breakup.

    13. 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.

    14. 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. 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.


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