Method of making high performance mixed matrix membranes using suspensions containing polymers and polymer stabilized molecular sieves
First Claim
1. A mixed matrix membrane comprising a dispersion of polymer stabilized molecular sieves in a continuous polymer matrix wherein said molecular sieves are stabilized by a composition consisting essentially of at least one glassy polymer wherein said polymer is a hydroxyl or amino group-terminated polymer selected from the group consisting of polyethersulfones, sulfonated polyethersulfones, polyethers, polyether ketones, poly(ethylene imine)s, poly(amidoamine)s, and polyetherimides or said polymer is a hydroxyl group-containing glassy polymer selected from the group consisting of poly(vinyl alcohol)s, cellulose acetate, cellulose triacetate, cellulose acetate-butyrate, cellulose propionate, ethyl cellulose, methyl cellulose, and nitrocellulose, and wherein said continuous polymer matrix comprises at least two different glassy polymers.
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Abstract
The present invention discloses a novel method of making high performance mixed matrix membranes (MMMs) using stabilized concentrated suspensions of solvents, uniformly dispersed polymer stabilized molecular sieves, and at least two different types of polymers as the continuous blend polymer matrix. MMMs as dense films or asymmetric flat sheet or hollow fiber membranes fabricated by the method described in the current invention exhibit significantly enhanced permeation performance for separations over the polymer membranes made from the continuous blend polymer matrix. MMMs of the present invention are suitable for a wide range of gas, vapor, and liquid separations such as alcohol/water, CO2/CH4, H2/CH4, O2/N2, CO2/N2, olefin/paraffin, iso/normal paraffins, and other light gases separations.
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Citations
26 Claims
- 1. A mixed matrix membrane comprising a dispersion of polymer stabilized molecular sieves in a continuous polymer matrix wherein said molecular sieves are stabilized by a composition consisting essentially of at least one glassy polymer wherein said polymer is a hydroxyl or amino group-terminated polymer selected from the group consisting of polyethersulfones, sulfonated polyethersulfones, polyethers, polyether ketones, poly(ethylene imine)s, poly(amidoamine)s, and polyetherimides or said polymer is a hydroxyl group-containing glassy polymer selected from the group consisting of poly(vinyl alcohol)s, cellulose acetate, cellulose triacetate, cellulose acetate-butyrate, cellulose propionate, ethyl cellulose, methyl cellulose, and nitrocellulose, and wherein said continuous polymer matrix comprises at least two different glassy polymers.
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13. A method of making a mixed matrix membrane comprising:
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a) dispersing a composition consisting essentially of molecular sieve particles in at least one solvent to form a slurry; b) then dissolving a glassy polymer to stabilize said molecular sieve particles in said slurry to form a polymer stabilized molecular sieve slurry wherein said polymer is a hydroxyl or amino group-terminated polymer selected from the group consisting of polyethersulfones, sulfonated polyethersulfones, polyethers, polyether ketones, poly(ethylene imine)s, poly(amidoamine)s, and polyetherimides or is a hydroxyl group-containing glassy polymer selected from the group consisting of poly(vinyl alcohol)s, cellulose acetate, cellulose triacetate, cellulose acetate-butyrate, cellulose propionate, ethyl cellulose, methyl cellulose, and nitrocellulose; c) then dissolving and mixing two glassy polymers into said polymer stabilized molecular sieve slurry to form a stabilized concentrated suspension; and d) then fabricating a mixed matrix membrane from said stabilized concentrated suspension. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification