mass transfer

nassar's picture

Kinetics, Equilibrium and Thermodynamic Studies on the Adsorptive Removal of Nickel, Cadmium ‎and Cobalt from Wastewater by Superparamagnetic Iron Oxide Nanoadsorbents

Journal Title, Volume, Page: 
The Canadian Journal of Chemical Engineering Volume 90, Issue 5, pages 1231–1238
Year of Publication: 
2012
Authors: 
Nashaat N. Nassar
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada, T2N 1N4
Current Affiliation: 
Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 

Because of its unique properties, such as specific functionality and large specific surface area, iron oxide nanoadsorbents had showed potential for energy and environmental applications. This work investigated the adsorptive removal of different metal ions from wastewater by superparamagnetic iron oxide nanoadsorbents (Fe3O4). Batch-adsorption technique was employed to assess the kinetic behaviour and adsorption equilibrium of cadmium, cobalt and nickel. Accordingly, the effect of the following variables on the adsorption reaction was tested, namely: solution pH, contact time and temperature. Metal ion adsorption was found to be highly pH dependent with a maximum uptake achieved around pH 5.5. Kinetic studies showed that adsorption was fast and equilibrium was achieved in less than 60 min. The external mass transfer kinetic model was applied to the experimental results and provided reasonable overall volumetric mass transfer coefficients. Adsorption isotherms were determined and appropriately described by the Freundlich and Langmuir models, with a better fit to the Freundlich model. The amount of metal ion adsorbed increased as the temperature increased, suggesting an endothermic adsorption process. The thermodynamics studies indicated that the adsorption process was spontaneous and endothermic in nature. © 2011 Canadian Society for Chemical Engineering

Husni Odeh's picture

Hydrodynamics and Mass Transfer of Textile Vibrating-Valve Trays

Journal Title, Volume, Page: 
Chemical Engineering Research and Design Volume 77, Issue 7, Pages 627–632
Year of Publication: 
1999
Authors: 
H. Mustafa
Chemical Engineering Department, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemical Engineering, Faculty of Engineering and Informtation Technology, An-Najah National University, Nablus, Palestine
A. Elhamouz
Chemical Engineering Department, An-Najah National University, Nablus, Palestine
E. Békássy-Molnár
Department of Food Engineering, University of Horticulture and Food, Budapest, Hungary
Preferred Abstract (Original): 

New types of vibrating-valve trays with textile valves were investigated to determine their optimal construction. Hydrodynamic and mass transfer measurements were carried out in a pilot plant with different vibrating-valve and conventional valve trays under identical experimental conditions. The total tray pressure drop (ΔP), column efficiency (η), volumetric mass transfer coefficient (KGa) and pressure drop per theoretical tray (Δp/Nth) were measured and compared.The high mass transfer rate, the low investment and operating costs, the corrosion and heat resistance make the vibrating-valve trays attractive for gas absorption and air cleaning in environmental protection.

elhamouz's picture

Hydrodynamics and Mass Transfer of Textile Vibrating-Valve Trays

Journal Title, Volume, Page: 
Trans IChemE, vol. 77, part A, 627, (1999).
Year of Publication: 
1999
Authors: 
A. Elhamouz
Chemical Engineering Department, An-Najah National Uni V ersity, P.O. Box 7, Nablus, Palestine
Current Affiliation: 
Chemical Engineering Department, An-Najah National Uni V ersity, P.O. Box 7, Nablus, Palestine
H. Mustafa
Chemical Engineering Department, An-Najah National Uni V ersity, P.O. Box 7, Nablus, Palestine
E. Békássy-Molnár
Department of Food Engineering, University of Horticulture and Food, Budapest, Hungary
Preferred Abstract (Original): 
New types of vibrating-valve trays with textile valves were investigated to determine their optimal construction. Hydrodynamic and mass transfer measurements were carried out in a pilot plant with different vibrating-valve and conventional valve trays under identical experimental conditions. The total tray pressure drop (ΔP), column efficiency (η), volumetric mass transfer coefficient (KGa) and pressure drop per theoretical tray (Δp/Nth) were measured and compared. The high mass transfer rate, the low investment and operating costs, the corrosion and heat resistance make the vibrating-valve trays attractive for gas absorption and air cleaning in environmental protection.
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