Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers

The removal of cane sugar solution colorant by packed-bed ion exchangers was modeled using a linear driving force (LDF) adsorption model. Adsorption of colorant is of interest to the developers of the White Sugar Mill (WSM) process as it is a complex subject. The problem is that color is an indiscre...

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Main Author: Broadhurst, Hugh Anthony
Other Authors: K.E.Thompson
Format: Others
Language:en
Published: LSU 2002
Subjects:
Online Access:http://etd.lsu.edu/docs/available/etd-0708102-145931/
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spelling ndltd-LSU-oai-etd.lsu.edu-etd-0708102-1459312013-01-07T22:48:00Z Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers Broadhurst, Hugh Anthony Chemical Engineering The removal of cane sugar solution colorant by packed-bed ion exchangers was modeled using a linear driving force (LDF) adsorption model. Adsorption of colorant is of interest to the developers of the White Sugar Mill (WSM) process as it is a complex subject. The problem is that color is an indiscrete mixture of many components making it difficult to measure and even more challenging to model. Colorant formation was investigated using gel permeation chromatography (GPC) with the objective of developing a method to define pseudo-components representative of cane sugar solution colorants. WSM is a process for producing white sugar directly from sugarcane in the raw sugar mill by using ultrafiltration and continuous ion exchange technology. The ion exchange resins employed were a strong acid cation (SAC) resin in the hydrogen form, a weak base anion (WBA) resin in the hydroxide form and a decolorizing resin in the chloride form. Decolorization using the three resins was then analyzed using the GPC pseudo-component technique. Batch testing of the resin allowed the development of equilibrium isotherms that could be substituted into a standard LDF model. Column testing was then performed to investigate the dynamics of adsorption of colorant in packed-beds. Linear isotherms were measured for each of the three resins, indicating that the colorant is dilute. Results indicated that a plug-flow model with a constant linear isotherm was sufficient in all cases except the SAC resin. The SAC adsorption parameter decreased sharply as the pH increased, causing colorant to be desorbed from the resin. This situation must be avoided if optimal decolorization is to be achieved. The adsorption models can be utilized in the design of a WSM process to optimize the decolorizing capacity of the resins. K.E.Thompson K.T.Valsaraj P.W.Rein LSU 2002-07-09 text application/pdf http://etd.lsu.edu/docs/available/etd-0708102-145931/ http://etd.lsu.edu/docs/available/etd-0708102-145931/ en unrestricted I hereby grant to LSU or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.
collection NDLTD
language en
format Others
sources NDLTD
topic Chemical Engineering
spellingShingle Chemical Engineering
Broadhurst, Hugh Anthony
Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers
description The removal of cane sugar solution colorant by packed-bed ion exchangers was modeled using a linear driving force (LDF) adsorption model. Adsorption of colorant is of interest to the developers of the White Sugar Mill (WSM) process as it is a complex subject. The problem is that color is an indiscrete mixture of many components making it difficult to measure and even more challenging to model. Colorant formation was investigated using gel permeation chromatography (GPC) with the objective of developing a method to define pseudo-components representative of cane sugar solution colorants. WSM is a process for producing white sugar directly from sugarcane in the raw sugar mill by using ultrafiltration and continuous ion exchange technology. The ion exchange resins employed were a strong acid cation (SAC) resin in the hydrogen form, a weak base anion (WBA) resin in the hydroxide form and a decolorizing resin in the chloride form. Decolorization using the three resins was then analyzed using the GPC pseudo-component technique. Batch testing of the resin allowed the development of equilibrium isotherms that could be substituted into a standard LDF model. Column testing was then performed to investigate the dynamics of adsorption of colorant in packed-beds. Linear isotherms were measured for each of the three resins, indicating that the colorant is dilute. Results indicated that a plug-flow model with a constant linear isotherm was sufficient in all cases except the SAC resin. The SAC adsorption parameter decreased sharply as the pH increased, causing colorant to be desorbed from the resin. This situation must be avoided if optimal decolorization is to be achieved. The adsorption models can be utilized in the design of a WSM process to optimize the decolorizing capacity of the resins.
author2 K.E.Thompson
author_facet K.E.Thompson
Broadhurst, Hugh Anthony
author Broadhurst, Hugh Anthony
author_sort Broadhurst, Hugh Anthony
title Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers
title_short Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers
title_full Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers
title_fullStr Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers
title_full_unstemmed Modeling Adsorption of Cane Sugar Colorant in Packed-Bed Ion Exchangers
title_sort modeling adsorption of cane sugar colorant in packed-bed ion exchangers
publisher LSU
publishDate 2002
url http://etd.lsu.edu/docs/available/etd-0708102-145931/
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