Crosslinked Membrane And Polymer For Making Same And Method Of Using Membrane
AssigneeChevron U.S.A. Inc.
InventorsWilliam J. Koros, David Wallace, John D. Wind, Stephen J. Miller, Claudia Staudt-Bickel
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Abstract
A composition of and a method of making high performance crosslinked membranes are described. The membranes have a high resistance to plasticization by use of crosslinking. The preferred polymer material for the membrane is a polyimide polymer comprising covalently bonded ester crosslinks. The resultant membrane exhibits a high permeability of CO2 in combination with a high CO2/CH4 selectivity. Another embodiment provides a method of making the membrane from a monesterified polymer followed by final crosslinking after the membrane is formed.
Claims7
A hollow fiber polymer membrane, comprising:
- a hollow fiber crosslinked polymer selected from the group consisting of polyimides, poyletherimides, polyethersulfones and polysulfones, having covalent ester crosslinks;
- and having a CO2 permeance of at least 20 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a pressure of 100 psia.
A method of making a crosslinked hollow fiber membrane comprising:
- preparing a polymer comprising a predetermined quantity of crosslinkable sites, the polymer selected from the group consisting of polyimides, poyletherimides, polyethersulfones and polysulfones, having covalent ester crosslinks having a CO2 permeance of at least 20 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a pressure of 100 psi;
- and
- forming a hollow fiber from the polymer.
A process for producing hydrocarbon products comprising:
- separating two gases having different molecular sizes in a feedstream including these two gas components, the process including:
- (a) providing a hollow fiber crosslinked polymer selected from the group consisting of polyimides, poyletherimides, polyethersulfones and polysulfones, having covalent ester crosslinks;
- and having a CO2 permeance of at least 20 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a pressure of 100 psi and
- (b) directing a feedstream including the first and second gas components to the feed side of the membrane and withdrawing a retentate stream depleted in the first gas component and withdrawing a permeate stream enriched in the first gas component from the permeate side of the membrane.
A hollow fiber polymer membrane, comprising:
- a hollow fiber polymer membrane including a porous support layer and a skin layer which is supported by the support layer, the skin layer including a crosslinked polymer selected from the group consisting of polyimides, poyletherimides, polyethersulfones and polysulfones and having covalent ester crosslinks;
- wherein the hollow fiber polymer membrane has a CO2 permeance of at least 20 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a pressure of 100 psia.
Dependencies are inferred from the claim text.