Abstract:
La presente solicitud se refiere a una fibra de intercambio iónico que incluye: una fibra de núcleo y una capa de intercambio iónico que está dispuesta próxima a la fibra de núcleo e incluye un compuesto polimérico reticulado que tiene un grupo de intercambio iónico, en la que, en una sección transversal perpendicular a una dirección longitudinal de la fibra de intercambio iónico, un área de la capa de intercambio iónico ocupa el 50% o más y el 90% o menos de un área total de la sección transversal, y la fibra de intercambio iónico tiene una relación de hinchamiento del 50% o menos.
Abstract:
The present invention provides a composite semipermeable membrane achieving high permeate amount and having high capability to inhibit adhesion of foulants to the membrane surface. The present invention relates to a composite semipermeable membrane including: a supporting membrane which includes a substrate and a porous supporting layer; and a polyamide separation functional layer formed on the porous supporting layer, in which an acidic group-containing hydrophilic polymer is introduced onto the surface of the separation functional layer via amide linkage, and relates to a method for producing such a composite semipermeable membrane.
Abstract:
This composite semipermeable membrane provided with a substrate, a porous supporting layer formed on the substrate, and a separation functional layer formed on the porous supporting layer, wherein the separation functional layer has a crosslinked wholly aromatic polyamide as the main component and contains a carboxy group. Of the functional groups contained in the separation functional layer, the ratio (molar equivalent of carboxy groups) / (molar equivalent of amide groups) is 0.40 or greater, and the average of oxygen atom/nitrogen atom ratios on the front and back of the separation functional layer is 0.95 or less.
Abstract:
Provided is a composite semipermeable membrane having a high salt removal rate and a high water permeability. The composite semipermeable membrane comprises a substrate, a porous support layer formed on the substrate, and a separation functional layer formed on the porous support layer, the hydrophilic macromolecule concentration on the substrate-side surface of the porous support layer being higher than that on the separation functional layer-side surface.