CROSSLINKED MEMBRANE AND POLYMER FOR MAKING SAME AND METHOD OF USING MEMBRANE
First Claim
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1. A polymer membrane comprising:
- a crosslinked polymer having covalent ester crosslinks formed from a crosslinkable polymer; 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.
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Abstract
A composition of and a method of making high performances 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.
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Citations
18 Claims
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1. A polymer membrane comprising:
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a crosslinked polymer having covalent ester crosslinks formed from a crosslinkable polymer; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A polymer comprising:
a polymer which has been monoesterified with a diol to form a crosslinkable polymer having an average molecular weight of between 20,000 and 200,000 and which can be formed into a membrane and transesterified to provide a crosslinked membrane 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. - View Dependent Claims (15, 16, 17)
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18. 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 crosslinked polymer having covalent ester crosslinks and having a CO2 permeance of at least 200 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a pressure of 100 psia, the membrane having feed and permeate sides and which is selectively permeable to a first gas component over a second gas component; 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) providing a crosslinked polymer having covalent ester crosslinks and having a CO2 permeance of at least 200 GPU and a CO2/CH4 selectivity of greater than 20, at 35 degrees C. and a pressure of 100 psia, the membrane having feed and permeate sides and which is selectively permeable to a first gas component over a second gas component; and
Specification