Mixed matrix membrane with mesoporous particles and methods for making and using the same
First Claim
1. A mixed matrix membrane for separating fluids comprising:
- a continuous phase polymer with inorganic molecular sieves interspersed therein, the polymer having a CO2/CH4 selectivity of at least 20 and the molecular sieves having a mesoporosity of at least 0.1 cc STP/g wherein;
the CO2 permeability of the mixed matrix membrane is increased by at least 30% with any decrease in selectivity being no more than 10% relative to a membrane made of the neat polymer.
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Abstract
A mixed matrix membrane for separating gas components from a mixture of gas components is disclosed. The membrane comprises a continuous phase polymer with inorganic porous particles, preferably molecular sieves, interspersed in the polymer. The polymer has a CO2/CH4 selectivity of at least 20 and the porous particles have a mesoporosity of at least 0.1 cc STP/g. The mixed matrix membrane exhibits an increase in permeability of least 30% with any decrease in selectivity being no more than 10% relative to a membrane made of the neat polymer. The porous particles may include, but are not limited to, molecular sieves such as CVX-7 and SSZ-13, and/or other molecular sieves having the required mesoporosity. A method for making the mixed matrix membrane is also described. Further, a method is disclosed for separating gas components from a mixture of gas components using the mixed matrix membrane with mesoporous particles.
83 Citations
23 Claims
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1. A mixed matrix membrane for separating fluids comprising:
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a continuous phase polymer with inorganic molecular sieves interspersed therein, the polymer having a CO2/CH4 selectivity of at least 20 and the molecular sieves having a mesoporosity of at least 0.1 cc STP/g wherein;
the CO2 permeability of the mixed matrix membrane is increased by at least 30% with any decrease in selectivity being no more than 10% relative to a membrane made of the neat polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for separating gas components from a feedstream containing a mixture of gas components, the method comprising:
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(a) providing a mixed matrix membrane including a continuous phase polymer having molecular sieves interspersed therein, the membrane having feed and permeate sides, the polymer having a CO2/CH4 selectivity of at least 20 and the molecular sieves having a mesoporosity of at least 0.1 cc STP/g; and
(b) directing a feedstream containing a mixture of first and second gas components to the feed side of the membrane and withdrawing a retentate stream depleted in the first gas component from the feed side and withdrawing a permeate stream enriched in the first gas component from the permeate side;
wherein the CO2 permeability of the mixed matrix membrane is increased by at least 30% with any decrease in selectivity being no more than 10% relative to a membrane made of the neat polymer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method of making a mixed matrix membrane comprising:
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mixing inorganic molecular sieves with a polymer in a solution, the inorganic molecular sieves having a mesoporosity of at least 0.1 cc STP/g and the polymer having a CO2/CH4 selectivity of at least 20;
forming a mixed matrix membrane with the molecular sieves interspersed in a continuous phase of the polymer;
wherein the CO2 permeability of the mixed matrix membrane is increased by at least 30% with any decrease in selectivity being no more than 10% relative to a membrane made of the neat polymer. - View Dependent Claims (21, 22, 23)
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Specification