membrane for the separation of liquid water alcohol mixtures and methods for their manufacture.

摘要

A membrane, for the separation of a water-alcohol mixed liquid by the pervaporation method, composed of a chitosan having a molecular weight of 80,000 to 150,000 and a deacetylation degree adjusted to 80 to 95% is prepared by dissolving a chitosan in an acidic aqueous solution to form a dope having the chitosan concentration of 9 to 12% by weight, shaping the dope into a membrane and immersing the membrane in an alkaline solution. The membrane has excellent selective permeability to water and mechanical strength.