Abstract
Polyether-block amides (PEBA) membranes incorporating polyester substrates, textile or nonwoven fabrics which can suppress the swelling were prepared by melt pressurization. Swelling and permeation of phenol in the membranes were investigated using phenol-water mixtures. The fabrics in the membranes were not wetted by PEBA before and after swelling tests. The sorption isotherm of phenol is linear up to an external concentration of 5×104 mg/kg. Water sorption was not influenced by the presence of phenol for phenol concentrations of less than about 5×104 mg/kg. The permeation rate could be correlated to the swelling of the membrane. Phenol concentration in the swollen PEBA membrane became higher compared with that in the feed solution and decreased in the permeate. The experiments confirmed that the separation was performed by selective sorption of phenol in the swollen PEBA membrane.In comparison with textiles, nonwoven fabrics suppressed the swelling in the PEBA membranes and the membranes showed high phenol/water selectivity.
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