Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution Process
A mathematical model of sorption of Zirconium and Hafnium cations mixture and elution of these ions from a cation exchange resin bed is developed. Sulfuric acid is selected as the eluent for selective separation of Zr and Hf in a packed bed of Dowex cation exchange resin. The column model is a dispe...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
2007-09-01
|
| Series: | Iranian Journal of Chemistry & Chemical Engineering |
| Subjects: | |
| Online Access: | http://www.ijcce.ac.ir/article_7632_c8ab4db93e57dae4a04dbc4e3392551d.pdf |
| _version_ | 1811284057648005120 |
|---|---|
| author | Shohreh Fatemi Hamid Feizy Zarnagh Masoud Kalantari Zeynab Salehi |
| author_facet | Shohreh Fatemi Hamid Feizy Zarnagh Masoud Kalantari Zeynab Salehi |
| author_sort | Shohreh Fatemi |
| collection | DOAJ |
| description | A mathematical model of sorption of Zirconium and Hafnium cations mixture and elution of these ions from a cation exchange resin bed is developed. Sulfuric acid is selected as the eluent for selective separation of Zr and Hf in a packed bed of Dowex cation exchange resin. The column model is a dispersed plug flow model,and assumed to consist of randomly packed synthetic and spherical resin beads with constant diameter. The beads are assumed to be porous containing not only active sites on their solid structure but also solution-filled pores. The model incorporates mass transfer resistances including inter and intra-particle effects within the solid and fluid phases. Intra-particle diffusion is treated by employing pore diffusion model. The adsorption phenomena of the cations on the active sites is expressed by the equilibrium relationship characterized by a form of the extended Langmuir equation. The batch experiments are carried out in order to determine Langmuir parameters at equilibrium, and pore diffusivity at transitional conditions. These parameters are used in the dynamic model of adsorption and desorption of the mentioned cations. Unlike a number of earlier models the present mathematical model does not have assumptions such as the linearity of the sorption isotherms, uniform concentration profile in the resin particles and ideal plug liquid flow along the bed. It is found that the present model predicts the breakthrough and chromatographic curves with a fair degree of accuracy. It is concluded that the eluent acid concentration and flow rate of the liquid along the bed are the most two important variables which influence the efficiency of separation. |
| first_indexed | 2024-04-13T02:21:46Z |
| format | Article |
| id | doaj.art-3fc739d395fc46588a8d1c79dd8ca668 |
| institution | Directory Open Access Journal |
| issn | 1021-9986 1021-9986 |
| language | English |
| last_indexed | 2024-04-13T02:21:46Z |
| publishDate | 2007-09-01 |
| publisher | Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR |
| record_format | Article |
| series | Iranian Journal of Chemistry & Chemical Engineering |
| spelling | doaj.art-3fc739d395fc46588a8d1c79dd8ca6682022-12-22T03:06:55ZengIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry & Chemical Engineering1021-99861021-99862007-09-0126361717632Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution ProcessShohreh Fatemi0Hamid Feizy Zarnagh1Masoud Kalantari2Zeynab Salehi3Department of Chemical Engineering, Faculty of Engineering, University of Tehran, P.O. Box 11365-4563 Tehran, I.R. IRANDepartment of Chemical Engineering, Faculty of Engineering, University of Tehran, P.O. Box 11365-4563 Tehran, I.R. IRANDepartment of Chemical Engineering, Faculty of Engineering, University of Tehran, P.O. Box 11365-4563 Tehran, I.R. IRANDepartment of Chemical Engineering, Faculty of Engineering, University of Tehran, P.O. Box 11365-4563 Tehran, I.R. IRANA mathematical model of sorption of Zirconium and Hafnium cations mixture and elution of these ions from a cation exchange resin bed is developed. Sulfuric acid is selected as the eluent for selective separation of Zr and Hf in a packed bed of Dowex cation exchange resin. The column model is a dispersed plug flow model,and assumed to consist of randomly packed synthetic and spherical resin beads with constant diameter. The beads are assumed to be porous containing not only active sites on their solid structure but also solution-filled pores. The model incorporates mass transfer resistances including inter and intra-particle effects within the solid and fluid phases. Intra-particle diffusion is treated by employing pore diffusion model. The adsorption phenomena of the cations on the active sites is expressed by the equilibrium relationship characterized by a form of the extended Langmuir equation. The batch experiments are carried out in order to determine Langmuir parameters at equilibrium, and pore diffusivity at transitional conditions. These parameters are used in the dynamic model of adsorption and desorption of the mentioned cations. Unlike a number of earlier models the present mathematical model does not have assumptions such as the linearity of the sorption isotherms, uniform concentration profile in the resin particles and ideal plug liquid flow along the bed. It is found that the present model predicts the breakthrough and chromatographic curves with a fair degree of accuracy. It is concluded that the eluent acid concentration and flow rate of the liquid along the bed are the most two important variables which influence the efficiency of separation.http://www.ijcce.ac.ir/article_7632_c8ab4db93e57dae4a04dbc4e3392551d.pdfion exchange resinmathematical modelingelution processzirconiumhafnium |
| spellingShingle | Shohreh Fatemi Hamid Feizy Zarnagh Masoud Kalantari Zeynab Salehi Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution Process Iranian Journal of Chemistry & Chemical Engineering ion exchange resin mathematical modeling elution process zirconium hafnium |
| title | Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution Process |
| title_full | Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution Process |
| title_fullStr | Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution Process |
| title_full_unstemmed | Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution Process |
| title_short | Ion Exchange Column Performance Model for Separation of Zr(IV) and Hf(IV) in Elution Process |
| title_sort | ion exchange column performance model for separation of zr iv and hf iv in elution process |
| topic | ion exchange resin mathematical modeling elution process zirconium hafnium |
| url | http://www.ijcce.ac.ir/article_7632_c8ab4db93e57dae4a04dbc4e3392551d.pdf |
| work_keys_str_mv | AT shohrehfatemi ionexchangecolumnperformancemodelforseparationofzrivandhfivinelutionprocess AT hamidfeizyzarnagh ionexchangecolumnperformancemodelforseparationofzrivandhfivinelutionprocess AT masoudkalantari ionexchangecolumnperformancemodelforseparationofzrivandhfivinelutionprocess AT zeynabsalehi ionexchangecolumnperformancemodelforseparationofzrivandhfivinelutionprocess |