Journal ArticleDOI
The cocurrent downflow contactor (CDC) reactor-chemically enhanced mass transfer & reaction studies for slurry & fixed bed catalytic hydrogenation
A.P. Boyes,A. Chughtai,X. X. Lu,S. Raymahasay,S. Sarmento,M. W. Tilston,John M. Winterbottom +6 more
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TLDR
The CDC has been shown to be a mass transfer device of high efficiency (100% gas utilization, 97% approach to equilibrium) giving overall mass transfer coefficient (k L a) which are very high (0.2-1.5 s −1 for O 2 /H 2 O) and when used as a slurry reactor for the catalytic hydrogenation of various unsaturated compounds, the reactions were shown to mostly surface reaction rate controlled as discussed by the authors.About:
This article is published in Chemical Engineering Science.The article was published on 1992-09-01. It has received 22 citations till now. The article focuses on the topics: Mass transfer coefficient & Reaction rate.read more
Citations
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Journal ArticleDOI
Alternative multiphase reactors for fine chemicals: A world beyond stirred tanks?
TL;DR: There are many reactor designs now available for multiphase contacting and reaction as discussed by the authors, some of which are a proprietary improvement on the simple stirred pot while others are significantly different, such as trickle beds, bubble columns and the use eductors and loop reactors for intense gas/liquid mixing.
Journal ArticleDOI
Novel supported Pd hydrogenation bionanocatalyst for hybrid homogeneous/heterogeneous catalysis
N.J. Creamer,I.P. Mikheenko,Ping Yong,Kevin Deplanche,D. Sanyahumbi,Joseph Wood,Katrin Pollmann,Mohamed L. Merroun,Sonja Selenska-Pobell,Lynne E. Macaskie +9 more
TL;DR: In this paper, a biologically supported nano-Pd contains particles of size ∼5nm and below, as determined using magnetic measurements (SQUID) and EXAFS spectroscopy.
Journal ArticleDOI
Dynamic MRI visualization of two‐phase flow in a ceramic monolith
Mick D. Mantle,Andrew J. Sederman,Lynn F. Gladden,S. Raymahasay,John M. Winterbottom,E.H. Stitt +5 more
TL;DR: In this article, the capabilities of this technique are illustrated with application to gas-liquid flow (more commonly referred to as Taylor flow or bubble-train flow) through a ceramic square-channel monolith system, for which it is demonstrated that bubble size distributions, phase volume fractions, and bubble-velocity distribution can be obtained.
Journal ArticleDOI
Three-phase photocatalysis using suspended titania and titania supported on a reticulated foam monolith for water purification
Idoko J. Ochuma,Oluwapomile O. Osibo,Robert P. Fishwick,Steve Pollington,Alison Mary Wagland,Joseph Wood,J. Mike Winterbottom +6 more
TL;DR: In this article, the first results on the performance of a pilot-scale photocatalytic oxidation reactor having a TiO2-coated 15 pores-per-inch (15 PPI) alumina reticulated foam monolith installed in the annular space between a centrally installed 1kW UV lamp and the internal wall of the reactor were presented.
Journal ArticleDOI
Optimisation of degradation conditions of 1,8-diazabicyclo[5.4.0]undec-7-ene in water and reaction kinetics analysis using a cocurrent downflow contactor photocatalytic reactor
TL;DR: In this article, the photocatalytic degradation of 1,8-diazabicyclo[5.0]undec-7-ene (DBU, a non-biodegradable nitrogenous organic compound) in water was optimised under UV radiation using titanium dioxide photocatalyst.
References
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Journal ArticleDOI
Chemical Engineering Use of Catalyzed Sulfite Oxidation Kinetics for the Determination of Mass Transfer Characteristics of Gas-Liquid Contactors
V. Linek,Václav Vacek +1 more
Journal ArticleDOI
The oxidation of aqueous sodium sulphite solutions
K.J.A. de Waal,J.C. Okeson +1 more
TL;DR: In this article, a method for the determination of the interfacial area between a gas and a liquid and of the surface renewal rate of this interface was proposed based on the oxidation of a concentrated aqueous sulphite solution with gaseous oxygen in the presence of cobaltous sulphate as a catalyst.
Journal ArticleDOI
Kinetics of hydrogenation of rapeseed oil: I. Influence of transport steps in kinetic study
L. Bern,M. Hell,N. H. Schöön +2 more
TL;DR: The influence of mass transfer steps in the kinetic study of rapeseed oil hydrogenation in a laboratory reactor was estimated in this paper, where hydrogenations were carried out at 140-200 C and at 0.3-10 atm hydrogen pressure in the presence of 0.087% of commercial nickel-on-kieselguhr catalyst.
Journal ArticleDOI
Mass transfer and scale-up in fat hydrogenation
TL;DR: In this paper, the mass transfer of hydrogen in fat hydrogenation was studied in two geometrically similar reactors of 30 and 500 liter capacity equipped for hydrogen recirculation, and a scale-up rule was formulated on the basis of the experiments and checked in industrial hydrogenations with a 24 m3 reactor.
Patent
Gas-liquid contacting
TL;DR: In this paper, a gas-liquid contacting system featuring, in an SO 2 scrubbing embodiment, reduced liquid entrainment which, in various aspects, eliminates the need for liquid recirculation, and permits spray regime operation increasing the ratio of SO 2 absorption to sulfite oxidation.
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