Cu (II) removal from tequila using an ion-exchange resin
2011; Elsevier BV; Volume: 127; Issue: 4 Linguagem: Inglês
10.1016/j.foodchem.2011.02.004
ISSN1873-7072
AutoresAlejandra Carreón-Álvarez, Azucena Herrera-González, Norberto Casillas, Rogelio Prado‐Ramírez, Mirna Estarrón‐Espinosa, Víctor Soto, W. de la Cruz, Maximiliano Bárcena-Soto, Sergio Gómez‐Salazar,
Tópico(s)Extraction and Separation Processes
ResumoAn ion-exchange resin was employed to remove copper from tequila. Elemental analysis, batch and column copper uptake measurements were performed to assess the extent of metal removal; FTIR and XPS were employed to elucidate the copper complexes formed on the surface of resin; GC was used to investigate resin fouling and the extent of methanol removal. A modified Langmuir isotherm was used to explain adsorption equilibrium data. A ligand density of 2.21 mmol/g as sulphonic group, was measured. Maximum copper uptake by resin was 0.59 mmol/g. GC results from column experiments revealed methanol changes from 311 mg/100 ml anhydrous alcohol (AA) to 212 mg/100 ml AA, complying with Mexican regulations. Tequila solution with copper (5.3 l, 7.3 mg/l) was treated to breakthrough point in column experiments reaching 0.5 mg/l of copper at effluent. These results comply with the Mexican regulation for copper concentration (⩽2 mg/l) showing the promise of resin for industrial applications in removal of copper and methanol from tequila.
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