In several innovative application fields there is an increasing requirement for Solvent Resistant Nanofiltration Membranes (SRNF). In this work an innovative SRNF membrane is presented: the thin selective layer is made of cross-linked polyurethane cast on an Ultrafiltration (UF) membrane, which is made of a stable polymeric material. The thin selective layer is produced by a simultaneous in-situ polymerisation and casting on the UF support. After characterizing both the UF and the NF composite membrane through chemical and physical analyses, the NF membranes have been tested in a NF pilot plant: the permeate fluxes and the rejection of 4’,5’-Dinitrofluorescein have been measured with four different organic solvents. The solvent transport through the novel SRNF membranes has been discussed by introducing a new variable, the normalized flux, obtaining a satisfying predictive model.
Preparation and characterisation of novel solvent resistant nanofiltration composite membranes based on crosslinked polyurethanes
MODESTI, MICHELE;
2007
Abstract
In several innovative application fields there is an increasing requirement for Solvent Resistant Nanofiltration Membranes (SRNF). In this work an innovative SRNF membrane is presented: the thin selective layer is made of cross-linked polyurethane cast on an Ultrafiltration (UF) membrane, which is made of a stable polymeric material. The thin selective layer is produced by a simultaneous in-situ polymerisation and casting on the UF support. After characterizing both the UF and the NF composite membrane through chemical and physical analyses, the NF membranes have been tested in a NF pilot plant: the permeate fluxes and the rejection of 4’,5’-Dinitrofluorescein have been measured with four different organic solvents. The solvent transport through the novel SRNF membranes has been discussed by introducing a new variable, the normalized flux, obtaining a satisfying predictive model.Pubblicazioni consigliate
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