Binary ion exchange of metal ions in Y and X zeolites
Document title: Binary ion exchange of metal ions in Y and X zeolites
Journal: Brazilian journal of chemical engineering
Database: PERIÓDICA
System number: 000308885
ISSN: 0104-6632
Authors: 1


2
3
Institutions: 1Universidade Estadual de Maringa, Departamento de Engenharia Quimica, Maringa, Parana. Brasil
2Universidade Federal do Rio de Janeiro, Escola de Quimica, Rio de Janeiro. Brasil
3Petroleo Brasileiro S.A., Centro de Pesquisa, Rio de Janeiro. Brasil
Year:
Season: Dic
Volumen: 20
Number: 4
Pages: 413-421
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract The ion exchange of Na for Cr/K, Cr/Mg and Cr/Ca in Y and X zeolites was studied using breakthrough curves. It was observed that Cr3+ ions were able to remove some competitive ions that had already been exchanged at the zeolitic sites, producing a sequential ion exchange. Some mass transfer parameters such as length of unused bed, overall mass transfer coefficient, operational ratio and dimensionless variance were studied. Chromium uptake was influenced much more by the competing ion in the NaX zeolite columns. The dimensionless variance indicated that Cr/K solution produced a greater axial dispersion than the Cr/Mg and Cr/Ca systems, probably due to some interaction between Cr3+ and K+ ions. The order of dynamic selectivity, provided by the cation uptake, was Cr3+ > Ca2+, Cr3+ > Mg2+ and Cr3+ > K+ for NaY zeolite and Ca2+ ~Cr3+, Mg2+ > Cr3+ and Cr3+ > K+ for NaX zeolite. Due to the more favorable mass transfer parameters and higher affinity for Cr3+, it was concluded that NaY zeolite was more efficient at chromium uptake in competitive systems
Disciplines: Química
Keyword: Ingeniería química,
Control de la contaminación,
Zeolitas,
Metales pesados,
Intercambio iónico,
Cromo
Keyword: Chemistry,
Chemical engineering,
Pollution control,
Zeolites,
Heavy metals,
Ion exchange,
Chromium
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