Gas separations using high performance mixed matrix membranes
First Claim
1. A process for separating at least one gas from a mixture of gases comprising:
- a) providing a mixed matrix gas separation membrane comprising a polymer stabilized molecular sieves approximately uniformly dispersed in a continuous polymer matrix phase comprising at least two different polymers wherein said continuous polymer matrix is permeable to at least one gas in said mixture of gases wherein said polymer stabilized molecular sieves are stabilized by at least one polymer selected from the group consisting of polyethersulfones, sulfonated polyethersulfones, polyethers, polyether ketones, poly(ethylene imine)s, poly(amidoamine)s, polyetherimides cellulose acetate, cellulose triacetate, cellulose acetate-butyrate, cellulose propionate, ethyl cellulose, methyl cellulose, nitrocellulose, and then said polymer stabilized molecular sieves are dispersed in said continuous polymer matrix phase;
b) contacting the mixture of gases on one side of the mixed matrix gas separation membrane to cause said at least one gas to permeate the mixed matrix gas separation membrane; and
c) removing from a side opposite to said one side of the mixed matrix gas separation membrane a permeate gas composition comprising a portion of said at least one gas which has permeated said mixed matrix gas separation membrane.
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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.
79 Citations
12 Claims
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1. A process for separating at least one gas from a mixture of gases comprising:
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a) providing a mixed matrix gas separation membrane comprising a polymer stabilized molecular sieves approximately uniformly dispersed in a continuous polymer matrix phase comprising at least two different polymers wherein said continuous polymer matrix is permeable to at least one gas in said mixture of gases wherein said polymer stabilized molecular sieves are stabilized by at least one polymer selected from the group consisting of polyethersulfones, sulfonated polyethersulfones, polyethers, polyether ketones, poly(ethylene imine)s, poly(amidoamine)s, polyetherimides cellulose acetate, cellulose triacetate, cellulose acetate-butyrate, cellulose propionate, ethyl cellulose, methyl cellulose, nitrocellulose, and then said polymer stabilized molecular sieves are dispersed in said continuous polymer matrix phase; b) contacting the mixture of gases on one side of the mixed matrix gas separation membrane to cause said at least one gas to permeate the mixed matrix gas separation membrane; and c) removing from a side opposite to said one side of the mixed matrix gas separation membrane a permeate gas composition comprising a portion of said at least one gas which has permeated said mixed matrix gas separation membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification