| CPC B01D 71/56 (2013.01) [B01D 61/025 (2013.01); B01D 67/0006 (2013.01); B01D 67/0083 (2013.01); B01D 69/02 (2013.01); B01D 69/12 (2013.01); B01D 69/1251 (2022.08); B01D 2323/081 (2022.08); B01D 2323/216 (2022.08); B01D 2323/219 (2022.08); B01D 2323/30 (2013.01); B01D 2323/48 (2013.01); B01D 2325/04 (2013.01); B01D 2325/06 (2013.01)] | 17 Claims |
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1. A process for fabricating a composite polyamide reverse osmosis membrane, comprising:
providing a microporous support;
coating the microporous support with an aqueous solution to form a liquid layer on the microporous support, wherein the aqueous solution comprises:
a monomeric polyamine having at least two functional amine groups; wherein the monomeric polyamine is in an amount in the range of 0.1 to 20 wt % of the aqueous solution;
a single tertiary amine, wherein the single tertiary amine is in an amount in the range of 1 to 10 wt % of the aqueous solution; and
an aliphatic sulfonic acids, wherein the aliphatic sulfonic acid is in an amount in the range of 0.25 to 10.0 wt % of the aqueous solution;
wherein the aqueous solution has a pH value in the range of 5.5 to 11;
contacting the liquid layer with an organic solution to form an organic layer on top of the liquid layer; wherein the organic solution comprises:
an amine-reactive reactant and an organic solvents, wherein the amine-reactive reactant is in the range of 0.01 to 5.0 wt/vol % of the organic solution; and
drying the microporous support together with the liquid layer and organic layer at a temperature of about 50° to 180° C.;
thereby a composite polyamide reverse osmosis membrane is fabricated.
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