Patent ID: 6024873
Filing Date: 2000-02-15
Classification: B01D

Abstract:
A highly permeable composite reverse osmosis membrane comprising:a thin film:a microporous support for supporting the thin film,wherein the thin film is a polyamide based skin layer obtained by polycondensation of a compound having two or more reactive amino groups and a polyfunctional acid halide having two or more reactive acid halide groups, the highly permeable composite reverse osmosis membrane having a salt rejection of 90% or more and a flux of 0.8 m.sup.3 /m.sup.2, day or more when evaluated by using a solution having pH 6.5 containing 500 ppm of sodium chloride at an operating pressure of 5 kgf/cm.sup.2 and a temperature of 25.degree. C., and having an isopropyl alcohol rejection of 60% or more when evaluated by using a solution having pH 6.5 containing 500 ppm of isopropyl alcohol at an operating pressure of 5 kgf/cm.sup.2 and a temperature of 25.degree. C.