SEPARATING MEMBRANE MADE FROM POLYION COMPLEX

摘要

A novel separating membrane made from a polyion complex, which is excellent in separation factor, permeation rate and stability of performance and is usable for separating a water/organic mixture by the membrane separation technology. The membrane is made from a polyion complex comprising an anionic carboxylate polymer and, ionically bonded thereto, a cationic polymer having a divalent piperidinium salt group. It has a permeation rate of 100 g/m<2>.hr or above and a separation factor of 1,000 or above as evaluated by pervaporation conducted by feeding a 99 wt.% aqueous ethanol solution at 70 DEG C into the inside of a hollow fiber and evacuating the outside thereof. The membrane has a permeation rate of 110 g/m<2>.hr and a separation factor of 1,500 after the durability test conducted for one month, thus being stable.