US5009679A
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Membranes formed from rigid aromatic polyimide polymers
Assignee: Air Products and Chemicals Inc
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Filing: 1990-05-25
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Granted: 1991-04-23
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Expires: 2010-05-25
Abstract
Abstract The present invention is a class of semi-permeable polymeric membranes and processes for using such membranes to separate one or more components of a gas mixture. The membranes are formed from aromatic polyimides derived from reaction of a 9,9-bis-(3,4-dicarboxyphenyl)-fluorene dianhydride and at least one aromatic diamine. These polyimide membranes exhibit high gas perm-selectivities and are especially useful in effecting the separation of oxygen and nitrogen from air.
Inventors
- 👤 Richard O. Angus
- 👤 Kahlil Yacoub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:37
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; B; B01; B01D; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64; C08G73/1039
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
167 words
A semi-permeable membrane formed from a polyimide obtained by the reaction of a 9,9-bis-(3,4-dicarboxyphenyl)fluorene represented by the formula: ##STR4## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl, alkenyl or alkoxy group having form 1 to about 8 carbon atoms, cyano or R 1 and R 1` , R 1 and R 2 , R 2 and R 3 , and R 3 and R 4 may together form part of cyclohydrocarbyl ring; and an aromatic diamine represented by the formulae: ##STR5## wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated; and L is a linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 2
Dependent Claim
167 words
A semi-permeable membrane formed from a polyimide obtained by the reaction of a 9,9-bis-(3,4-dicarboxyphenyl)fluorene represented by the formula: ##STR4## wherein R 1 through R 4 , inclusive, are independently selected from a hydrogen atom, a linear or branched alkyl, alkenyl or alkoxy group having form 1 to about 8 carbon atoms, cyano or R 1 and R 1` , R 1 and R 2 , R 2 and R 3 , and R 3 and R 4 may together form part of cyclohydrocarbyl ring; and an aromatic diamine represented by the formulae: ##STR5## wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated; and L is a linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 3
Dependent Claim
61 words
The semi-permeable membrane according to claim 1 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms; and L is a linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms.
Claim 4
Dependent Claim
69 words
The semi-permeable membrane according to claim 1 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a partially or fully fluorinated linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms; and L is a partially or fully fluorinated linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms.
Claim 5
Dependent Claim
37 words
The semi-permeable membrane according to claim 1 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl group having from 1 to about 8 carbon atoms.
Claim 6
Dependent Claim
36 words
The semi-permeable membrane according to claim 4 wherein L is selected from a linear or branched alkylene group having from 1 to about 6 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 7
Dependent Claim
41 words
The semi-permeable membrane according to claim 1 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a partially or fully fluorinated linear or branched alkyl group having from 1 to about 8 carbon atoms.
Claim 8
Dependent Claim
36 words
The semi-permeable membrane according to claim 5 wherein L is selected from a linear or branched alkylene group having from 1 to about 6 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 9
Dependent Claim
96 words
A semi-permeable membrane formed from a polyimide obtained by the reaction of 9,9-bis-(3,4-dicarboxyphenyl)fluorene and an aromatic diamine represented by the formulae: ##STR6## wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated; and L is a linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 10
Dependent Claim
96 words
A semi-permeable membrane formed from a polyimide obtained by the reaction of 9,9-bis-(3,4-dicarboxyphenyl)fluorene and an aromatic diamine represented by the formulae: ##STR6## wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated; and L is a linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 11
Dependent Claim
61 words
The semi-permeable membrane according to claim 8 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms; and L is a linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms.
Claim 12
Dependent Claim
69 words
The semi-permeable membrane according to claim 8 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a partially or fully fluorinated linear or branched alkyl, alkenyl or alkoxy group having from 1 to about 8 carbon atoms; and L is a partially or fully fluorinated linear or branched alkylene, alkenylene, phenylene or alkylphenylene group having from 1 to about 8 carbon atoms.
Claim 13
Dependent Claim
37 words
The semi-permeable membrane according to claim 8 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a linear or branched alkyl group having from 1 to about 8 carbon atoms.
Claim 14
Dependent Claim
36 words
The semi-permeable membrane according to claim 11 wherein L is selected from a linear or branched alkylene group having from 1 to about 6 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 15
Dependent Claim
41 words
The semi-permeable membrane according to claim 8 wherein R 5 through R 8 , inclusive, are independently selected from a hydrogen atom or a partially or fully fluorinated linear or branched alkyl group having from 1 to about 8 carbon atoms.
Claim 16
Dependent Claim
36 words
The semi-permeable membrane according to claim 12 wherein L is selected from a linear or branched alkylene group having from 1 to about 6 carbon atoms, each of which can optionally be partially or fully fluorinated.
Claim 17
Dependent Claim
14 words
A semi-permeable membrane formed from a polyimide containing polymerizable units of the formula: ##STR7##
Claim 18
Dependent Claim
14 words
A semi-permeable membrane formed from a polyimide containing polymerizable units of the formula: ##STR7##
Claim 19
Dependent Claim
39 words
A process for separating a component of a gas mixture containing at least one other component, said process comprising: bringing said gas mixture into contact with the membrane of claim 1 whereby one component selectively permeates through said membrane.
Claim 20
Dependent Claim
19 words
The process according to claim 16 wherein the gas mixture is air and oxygen selectively permeates through the membrane.
Claim 21
Dependent Claim
14 words
The process according to claim 16 wherein the gas mixture contains nitrogen and oxygen.
Claim 22
Dependent Claim
39 words
A process for separating a component of a gas mixture containing at least one other component, said process comprising: bringing said gas mixture into contact with the membrane of claim 8 whereby one component selectively permeates through said membrane.
Claim 23
Dependent Claim
19 words
The process according to claim 19 wherein the gas mixture is air and oxygen selectively permeates through the membrane.
Claim 24
Dependent Claim
14 words
The process according to claim 19 wherein the gas mixture contains nitrogen and oxygen.
Claim 25
Dependent Claim
39 words
A process for separating a component of a gas mixture containing at least one other component, said process comprising: bringing said gas mixture into contact with the membrane of claim 15 whereby one component selectively permeates through said membrane.
Claim 26
Dependent Claim
19 words
The process according to claim 22 wherein the gas mixture is air and oxygen selectively permeates through the membrane.
Claim 27
Dependent Claim
14 words
The process according to claim 22 wherein the gas mixture contains nitrogen and oxygen.
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