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 continuous polymer matrix comprises at least two different 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
28 Claims
- 1. A mixed matrix membrane comprising a dispersion of polymer stabilized molecular sieves in a continuous polymer matrix wherein said continuous polymer matrix comprises at least two different polymers.
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14. A method of making a mixed matrix membrane comprising:
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a) dispersing molecular sieve particles in at least one solvent to form a slurry; b) dissolving a polymer to stabilize said molecular sieve particles in said slurry to form a polymer stabilized molecular sieve slurry; c) dissolve and mix two 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 (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification