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Removal of Cr^3^+ in fixed bed using zeolite NaY [An article from: Chemical Engineering Journal]
Book Details
PublisherElsevier
ISBN / ASINB000RR96LK
ISBN-13978B000RR96L9
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
In this work the chromium exchange mechanism in zeolite NaY was studied. The breakthrough data were determined in an up-flow fixed bed at 30^oC using three bed heights: 1.5, 3.0 and 4.5cm. It was seen that the bed height influenced the maximum chromium uptake as well as the mass transfer zone due to changes in pH during the ion exchange process. Changes in pH generated different chromium species with particular difficulties in diffusing towards the exchange sites of the zeolite. The linear driving force (LDF) model for breakthrough curves fitted well to the experimental data and the estimated overall mass transfer coefficient also changed with bed height, which is a consequence of different chromium speciation in the ion exchange mechanism. The axial dispersion coefficient can be considered as an average of 8.25x10^2, 1.04x10^2 and 3.36x10^2cm^2/min for the bed heights of 1.5, 3.0 and 4.5cm, respectively.
Description:
In this work the chromium exchange mechanism in zeolite NaY was studied. The breakthrough data were determined in an up-flow fixed bed at 30^oC using three bed heights: 1.5, 3.0 and 4.5cm. It was seen that the bed height influenced the maximum chromium uptake as well as the mass transfer zone due to changes in pH during the ion exchange process. Changes in pH generated different chromium species with particular difficulties in diffusing towards the exchange sites of the zeolite. The linear driving force (LDF) model for breakthrough curves fitted well to the experimental data and the estimated overall mass transfer coefficient also changed with bed height, which is a consequence of different chromium speciation in the ion exchange mechanism. The axial dispersion coefficient can be considered as an average of 8.25x10^2, 1.04x10^2 and 3.36x10^2cm^2/min for the bed heights of 1.5, 3.0 and 4.5cm, respectively.
