Chemical Engineering & Technology
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Recent Special Issues
CHISA: 21st International Congress of Chemical and Process Engineering - Part 2
Edited by: Jiri Kristal
8th CBM Workshop on Chemical and Biological Micro Laboratory Technologies
Edited by: Michael Köhler
Edited by: Gerard Coquerel, Nicolas Couvrat, Yohann Cartigny
CHISA: 21st International Congress of Chemical and Process Engineering
Edited by: Jiri Kristal
Recently Published Articles
- Time-Resolved Fluorescence HPLC Detection Using Semiconductor Light Sources: Principles and Applications
Article first published online: 31 AUG 2015 | DOI: 10.1002/ceat.201500152
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.
- 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
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.
- 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
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.
- 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
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.
- 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
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.