Artículos de revistas
Separation of potassium clavulanate and potassium chloride by nanofiltration Transport and evaluation of membranes
Registro en:
Separation And Purification Technology. Elsevier Science Bv, v. 83, n. 23, n. 30, 2011.
1383-5866
WOS:000297444900004
10.1016/j.seppur.2011.07.019
Autor
Carvalho, AL
Maugeri, F
Pradanos, P
Silva, V
Hernandez, A
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) In this work, four commercial nanoporous membranes (NF and NF90 from Filmtec (TM), and NP010 and NP030 from Microdyn Nadir) have been characterized and evaluated in order to use them to separate potassium clavulanate and potassium chloride. Their charge density has been investigated by Tangential Streaming Potential measurements for several concentrations of KCl and pH. The isoelectric point of the membranes has been found to be between pH 5.0 and 6.0. Their rejection for KCl has also been measured and the corresponding concentration polarization effect has been taken into account. Nanofiltration modeling, that considers the steric, electric and dielectric exclusion and the charge variation along the pores (SEDE-VCh model), satisfactorily describes the retention of KCl by using the dielectric constant inside the pores, epsilon(p), as the only fitting parameter. Although all the studied membranes are highly retentive for the potassium clavulanate, KCA, the most suitable membranes for KCA purification, attending to the KCl/KCA selectivity are NF or NF90 membranes at all pH. Lower pH values give higher selectivity for all the membranes. (C) 2011 Elsevier B.V. All rights reserved. 83 23 30 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Spanish Ministerio de Ciencia e Innovacion (MCINN) [CTQ2009-07666, MAT2008-00619] Grupos de Excelencia [GR18] Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Spanish Ministerio de Ciencia e Innovacion (MCINN) [CTQ2009-07666, MAT2008-00619] Grupos de Excelencia [GR18]