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Clean (“Green”) Ion-Exchange Technologies. 4. High-Ca-Selectivity Ion-Exchange Material for Self-Sustaining Decalcification of Mineralized Waters Process

AuthorsMuraviev, Dmitri; Khamizov, Ruslan Kh.; Tikhonov, Nikolai A.; Gómez-Morales, J.
KeywordsDecalcification of seawater
Ion-exchange sorbents
Isothermal supersaturation
Issue Date20-Mar-2004
PublisherAmerican Chemical Society
CitationIndustrial and Engineering Chemistry Research 43 (8): 1868–1874 (2004)
AbstractThis paper (the fourth in a series) reports the results of a theoretical and experimental study of the decalcification of seawater on different ion-exchange sorbents by simultaneous use of electroselectivity reversal and ion-exchange isothermal supersaturation (IXISS) effects. A detailed evaluation of the influence of the sorbent properties on the efficiency of the IXISS-based self-sustaining seawater decalcification process was carried out through a series of computer experiments using a mathematical model of the dynamics of ion exchange. It was found that the best sorbent to be used in the process is a modified A-type zeolite. The modification of the zeolite includes sequential treatment of the initial ion exchanger with dilute magnesium-containing solution (or seawater) and concentrated sodium salt solution. The first treatment was carried out at elevated temperature [15−20 °C higher than the temperature at which the modified zeolite (MZ) is expected to be used, Tex], and the second was performed at Tex. The complete regeneration of the MZ after the calcium sorption cycle was carried out with the calcium-free brine produced by the seawater desalination unit. The process is continuous and operates in the closed-cycle mode.
Publisher version (URL)http://dx.doi.org/10.1021/ie030460b
Appears in Collections:(IACT) Artículos
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