| Título: | Measurements by holographic interferometry of concentration profiles in dead-end ultrafiltration of polyethylene glycol solutions |
| Autores: |
Fernández Sempere, Julio Ruiz Beviá, Francisco Salcedo Díaz, Raquel |
| Fecha: |
2007-11-03 2007-11-03 2004-02-01 |
| Publicador: | RUA Docencia |
| Fuente: |
 |
| Tipo: | info:eu-repo/semantics/article |
| Tema: |
Ultrafiltration Holographic interferometry Concentration profiles Polyethylene glycol Concentration polarization Modelling Ingeniería Química |
| Descripción: |
Anoptical method (microscopic holographic interferometry) has been used to visualize concentration changes in the vicinity of the membrane
surface while a polyethylene glycol 2000 (PEG) solution was ultrafiltered with a cellulose acetate membrane. This interferometric technique
is based on the fact that changes of refractive index, which are associated to changes of concentration, can be visualized as interference fringes.
Interferograms obtained in different experimental conditions (initial PEG 2000 concentration range from 1 to 10 kg/m3 and transmembrane
pressure range from 1 × 105 to 3 × 105 Pa) as well as permeate flux are presented. Concentration profiles in the polarized layer near the
membrane surface have been determined from these interferograms. In all cases, after about 20 min of ultrafiltration process, the profiles
remained stable and a “pseudo-steady state” seemed to be reached. Moreover, solute concentration in the vicinity of the membrane did not
reach much higher values than the initial concentration. This research was sponsored by the Plan Nacional de I+ D+I BQU2000-0456 (Ministerio de Educación y Cultura). Holographic interferometry equipment was financed by the Conselleria d’Educació i Ciencia (Generalitat Valenciana). |
| Idioma: | Inglés |
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