Composite membrane and method for making the same
First Claim
1. A method for making a composite membrane comprising the non-sequential steps of coating a porous support with:
- (i) a solution containing a polyfunctional amine and (ii) a solution containing a polyfunctional acyl halide, wherein the polyfunctional amine and polyfunctional acyl halide are contacted with each other and react to form a polyamide layer on the porous support, the process being characterized by the step of contacting a phosphorous containing compound with the polyfunctional acyl halide prior to the reaction between the polyfunctional acyl halide and polyfunctional amine wherein the phosphorous containing compound has a solubility parameter of from about 15 to about 26 J½
cm−
{fraction (3/2)}.
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Accused Products
Abstract
A composite membrane and method for making the same, comprising a porous support and a crosslinked polyamide surface. The subject membrane provides improved flux and/or rejection rates. The subject membrane is further capable of operating at lower operating pressures. The subject method includes reacting a polyfunctional amine with a polyfunctional acyl halide to form a polyamide. The method includes the step of contacting a phosphorous containing compound with the polyfunctional acyl halide prior to and/or during the reaction between the polyfunctional acyl halide and a polyfunctional amine. The subject process is easily adapted to commercial scale manufacturing processes and is particularly suited for making nanofiltration and reverse osmosis composite membranes.
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Citations
30 Claims
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1. A method for making a composite membrane comprising the non-sequential steps of coating a porous support with:
- (i) a solution containing a polyfunctional amine and (ii) a solution containing a polyfunctional acyl halide, wherein the polyfunctional amine and polyfunctional acyl halide are contacted with each other and react to form a polyamide layer on the porous support, the process being characterized by the step of contacting a phosphorous containing compound with the polyfunctional acyl halide prior to the reaction between the polyfunctional acyl halide and polyfunctional amine wherein the phosphorous containing compound has a solubility parameter of from about 15 to about 26 J½
cm−
{fraction (3/2)}. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
- (i) a solution containing a polyfunctional amine and (ii) a solution containing a polyfunctional acyl halide, wherein the polyfunctional amine and polyfunctional acyl halide are contacted with each other and react to form a polyamide layer on the porous support, the process being characterized by the step of contacting a phosphorous containing compound with the polyfunctional acyl halide prior to the reaction between the polyfunctional acyl halide and polyfunctional amine wherein the phosphorous containing compound has a solubility parameter of from about 15 to about 26 J½
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30. A method for making a composite membrane comprising the steps of coating a porous support with an aqueous solution containing a polyfunctional amine followed by subsequently coating an organic solution containing a polyfunctional acyl
halide such that the polyfunctional amine and polyfunctional acyl halide are contacted with each other and react to form a polyamide layer on the porous support, the process being characterized by the step of including from 0.001 to 10 weight volume percent of a non-pyrophoric phosphorous containing compound within the polyfunctional acyl halide solution, wherein the phosphorous containing compound has a solubility parameter of from about 15 to about 26 J½ - cm−
{fraction (3/2)}, an energy of interaction with the polyfunctional acyl halide of greater than 4.0 kcal/Mole and is represented by the formula;wherein Z is the same or different and is selected from;
X, O—
P—
(X)2, P(O)—
X2, (P(—
X))m—
P—
X2, (O—
P(—
X))m—
O—
P—
X2, (P(O)(—
X))m—
P(O)—
X2, and (O—
P(O)(—
X))m—
O—
P(O)—
X2;
P is phosphorous, O is oxygen, m is an integer from 1 to 5;
Y is O or a non-bonded pair of electrons, X is the same or different and is selected from;
R and R including one or more oxygen linkage(s), and R is the same or different and is selected from H (hydrogen), and a C1-C12 containing moiety.
- cm−
Specification