Method for producing highly permeable composite reverse osmosis

Details Method for producing highly permeable composite reverse osmosis Method for producing highly permeable composite reverse osmosis

1995-12-22

1998-03-31

Dudash, Diana

Coating processes

Foraminous product produced

Microporous coating

4272556, 427301, 427340, B05D 310, B05D 500, C23C 1600

Patent

active

057336024

ABSTRACT:
Disclosed is a method for producing a composite reverse osmosis membrane comprising the steps of coating a porous support with (A) a solution containing a compound having at least two reactive amino groups per molecule and bringing (B) a solution containing a polyfunctional acid halide into contact with the solution (A) to induce crosslinking to form a crosslinked polyamide skin layer, in which the crosslinking is carried out in the presence of a substance having a solubility parameter of 8 to 14 (cal/cm.sup.3).sup.1/2. The resulting composite reverse osmosis membrane exhibits high salt rejection and high water permeability.

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