Near critical and supercritical fluid extraction of Cu(II) from aqueous solutions using a hollow fiber contactor
The aim of this work is the experimental and theoretical characterization of the mass transfer in a membrane-based dense gas extraction of metal ions from aqueous solutions using a hollow fiber contactor. Extractions of Cu(II) were conducted in a single fiber membrane contactor operating under stead...
| Autor Principal: | Valdés-Riquelme, Hugo |
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| Otros Autores: | Sepúlveda, Rossana, Romero, Julio, Valenzuela, Fernando, Sánchez J, José |
| Formato: | Artículo |
| Idioma: | English |
| Publicado: |
2017
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| Acceso en línea: |
http://repositorio.ucm.cl:8080/handle/ucm/1374 |
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| Sumario: |
The aim of this work is the experimental and theoretical characterization of the mass transfer in a membrane-based dense gas extraction of metal ions from aqueous solutions using a hollow fiber contactor. Extractions of Cu(II) were conducted in a single fiber membrane contactor operating under steady state conditions. Aqueous CuSO4 solutions were treated using a CO2 phase containing 1,1,1-trifluoro- 2,4-pentanedione (TFA) or 1,1,1,5,5,5-hexafluoro-2,4-pentanedione (HFA) at 40 ◦C and pressures ranged between 70 and 90 bar. Experiments show that the use of dense CO2 as extraction solvent of Cu(II) ions reaches extraction efficiencies valued up to 98.7%. Simultaneously, a mass transfer model was proposed correlating an
effective rate function of the complex formation at the aqueous-CO2 interface. The highest extraction efficiencies were observed at higher pressures and lower pH values, which could confirm that a high content of protons is required to facilitate and stabilize the formation complex by means of keto-enol tautomerism. This work represents the first step in order to propose a novel intensified operation, which could be applied for high valued metals or hazardous materials. |
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