Method for producing defect free composite membranes

Details Method for producing defect free composite membranes Method for producing defect free composite membranes

2006-07-25

2006-07-25

Fortuna, Ana (Department: 1723)

Coating processes

Vacuum utilized prior to or during coating

Organic base

C427S246000, C427S294000, C264S045100, C264S173170, C264S173180

Reexamination Certificate

active

07081273

ABSTRACT:
A defect free semipermeable composite membrane having excellent integrity and high water permeability is provided. Said composite membrane comprises an inside support layer to provide sufficient mechanical strength; an outside barrier layer to provide selective separation; and a middle layer to provide both physical adhesion and chemical binding between said support and said barrier layer to bond them together. Three different methods for making said defect free composite membrane are discovered. These methods have been successfully utilized to produce high quality coatings and defect free composite membranes, which are independent of chemical composition and physical structure of said support. In the present invention, ultrasonic sonication is discovered to be effective to speed up the phase inversion process of a membrane casting solution, thus allows produce a composite membrane at a speed much higher than those disclosed in the prior art. Said defect free composite membranes have broad applications, ranging from filtration of fruit juice, wine and milk to biotech down stream processing and purification of drinking water, municipal and industrial wastewater.

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