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US4874401A
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Gas separation membranes from bisphenol AF polycarbonates and polyestercarbonates
Assignee: MG Generon Inc
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Filing: 1987-11-20
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Granted: 1989-10-17
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Expires: 2007-11-20
Abstract
Abstract The invention relates to a gas separation membrane comprsing a thin discriminating layer of bisphenol AF polycarbonate or polyestercarbonate. The invention further relates to a method of separating gases comprising (a) contacting with a feed gas mixture under pressure one side of a semi-permeable membrane comprising a thin discriminating layer of polycarbonate or polyestercarbonate, wherein the diphenolic residue in the polymer backbone is based on bisphenol AF; (b) maintaining a pressue differential across the membrane under conditions such that a component(s) of the feed gas selectively permeates through the membrane from the high pressure side to the low pressure side of the membrane; (c) removing the permeated gas which is enriched in the faster permeating component(s) from the low pressure side of the membrane; (d) removing the nonpermeated gas which is depleted in the faster permeating component(s) from the high pressure side of the membrane.
Inventors
- 👤 Thomas O. Jeanes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; B; B01; B01D; B01D71/00; B01D71/06; B01D71/48; B01D71/50; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
122 words
A method of separating gases comprising (a) contacting with a feed gas mixture under pressure one side of a semi-permeable membrane comprising a thin discriminating layer of polycarbonate or polyestercarbonate, wherein the diphenolic residue in the polymer backbone is based on bisphenol AF; (b) maintaining a pressure differential across the membrane under conditions such that a component(s) of the feed gas selectively permeates through the membrane from the high pressure side to the low pressure side of the membrane; (c) removing the permeated gas which is enriched in the faster permeating component(s) from the low pressure side of the membrane; and (d) removing the nonpermeated gas which is depleted in the faster permeating component(s) from the high pressure side of the membrane.
Claim 2
Independent Claim
122 words
A method of separating gases comprising (a) contacting with a feed gas mixture under pressure one side of a semi-permeable membrane comprising a thin discriminating layer of polycarbonate or polyestercarbonate, wherein the diphenolic residue in the polymer backbone is based on bisphenol AF; (b) maintaining a pressure differential across the membrane under conditions such that a component(s) of the feed gas selectively permeates through the membrane from the high pressure side to the low pressure side of the membrane; (c) removing the permeated gas which is enriched in the faster permeating component(s) from the low pressure side of the membrane; and (d) removing the nonpermeated gas which is depleted in the faster permeating component(s) from the high pressure side of the membrane.
Claim 3
Dependent Claim
113 words
The method of claim 1, wherein the membrane is comprised of a thin discriminating layer of polyestercarbonate corresponding to the formula: ##STR7## wherein R is independently in each occurrence hydrogen, a halogen, a C 1-6 alkyl, a C 1-6 haloalkyl, or a C 1-4 alkoxy; R 1 is independently in each occurrence a divalent unsubstituted or halo-substituted C 1-20 hydrocarbon; x is a positive real number from about 0.05 to 1.0, y is a positive real number from 0 to about 0.95, with the proviso that the ratio of ester to carbonate groups is between about 50 to about 0 percent; and n is a positive real number from about 20 or greater.
Claim 4
Dependent Claim
34 words
The method of claim 2, wherein R 1 is a divalent unsubstituted or halo-substituted C 1-18 aliphatic, a divalent unsubstituted or halo-substituted C 5-20 cycloaliphatic, or a divalent unsubstituted or halo-substituted C 6-20 aromatic.
Claim 5
Dependent Claim
54 words
The method of claim 3, wherein R 1 is ##STR8## wherein R 3 is independently in each occurrence a halogen, an unsubstituted or halo-substituted C 1-4 alkyl, or phenyl; m is independently in each occurrence a positive integer from 0 to 4; and R 4 is a C 1-6 divalent unsubstituted or halo-substituted alkyl.
Claim 6
Dependent Claim
27 words
The method of claim 4, wherein the polyestercarbonate is derived from bisphenol AF and terephthaloyl chloride, isophthaloyl chloride, or a mixture of terephthaloyl chloride and isophthaloyl chloride.
Claim 7
Dependent Claim
22 words
The method of claim 5, wherein R is independently in each occurrence fluorine, a C 1-6 haloalkyl, or a C 1-4 alkoxy.
Claim 8
Dependent Claim
31 words
The method of claim 6, wherein the feed gas mixture contains at least one gaseous component selected from the group of hydrogen, helium, oxygen, nitrogen, carbon dioxide, methane, or light hydrocarbons.
Claim 9
Dependent Claim
16 words
The method of claim 7, wherein the separation factor for oxygen/nitrogen is about 3.5 or greater.
Claim 10
Dependent Claim
17 words
The method of claim 7, wherein the separation factor for carbon dioxide/methane is about 16 or greater.
Claim 11
Dependent Claim
57 words
The method of claim 1, wherein the membrane is comprised of a thin discriminating layer of polycarbonate corresponding to the formula: ##STR9## wherein R is independently in each occurrence hydrogen, a halogen, a C 1-6 alkyl, a C 1-6 haloalkyl, or a C 1-4 alkoxy; and n is a positive real number from about 20 or greater.
Claim 12
Dependent Claim
22 words
The method of claim 10, wherein R is independently in each occurrence fluorine, a C 1-6 haloalkyl, or a C 1-4 alkoxy.
Claim 13
Dependent Claim
31 words
The method of claim 11, wherein the feed gas mixture contains at least one gaseous component selected from the group of hydrogen, helium, oxygen, nitrogen, carbon dioxide, methane, or light hydrocarbons.
Claim 14
Dependent Claim
17 words
The method of claim 12, wherein the separation factor for oxygen nitrogen is about 3.5 or greater.
Claim 15
Dependent Claim
17 words
The method of claim 12, wherein the separation factor for carbon dioxide/methane is about 16 or greater.
Claim 16
Dependent Claim
47 words
A gas separation membrane comprising a thin discriminating layer of polycarbonate or polyestercarbonate, wherein the diphenolic residue in the polymer backbone is based on bisphenol AF, wherein the gas separation membrane functions as a semi-permeable membrane capable of separating at least one gas from a gas mixture.
Claim 17
Dependent Claim
47 words
A gas separation membrane comprising a thin discriminating layer of polycarbonate or polyestercarbonate, wherein the diphenolic residue in the polymer backbone is based on bisphenol AF, wherein the gas separation membrane functions as a semi-permeable membrane capable of separating at least one gas from a gas mixture.
Claim 18
Dependent Claim
113 words
The membrane of claim 15, wherein the membrane is comprised of a thin discriminating layer of polyestercarbonate corresponding to the formula: ##STR10## wherein R is independently in each occurrence hydrogen, a halogen, a C 1-6 alkyl, a C 1-6 haloalkyl, or a C 1-4 alkoxy; R 1 is independently in each occurrence a divalent unsubstituted or halo-substituted C 1-20 hydrocarbon; x is a positive real number from about 0.05 to 1.0, y is a positive real number from 0 to about 0.95, with the proviso that the ratio of ester to carbonate groups is between about 50 to about 0 percent; and n is a positive real number from about 20 or greater.
Claim 19
Dependent Claim
34 words
The membrane of claim 16, wherein R 1 is a divalent unsubstituted or halo-substituted C 1-18 aliphatic, a divalent unsubstituted or halo-substituted C 5-20 cycloaliphatic, or a divalent unsubstituted or halo-substituted C 6-20 aromatic.
Claim 20
Dependent Claim
54 words
The membrane of claim 17, wherein R 1 is ##STR11## wherein R 3 is independently in each occurrence a halogen, an unsubstituted or halo-substituted C 1-4 alkyl, or phenyl; m is independently in each occurrence a positive integer from 0 to 4; and R 4 is a C 1-6 divalent unsubstituted or halo-substituted alkyl.
Claim 21
Dependent Claim
27 words
The membrane of claim 18, wherein the polyestercarbonate is derived from bisphenol AF and terephthaloyl choride, isophthaloyl chloride or a mixture of terephthaloyl chloride and isophthaloyl chloride.
Claim 22
Dependent Claim
22 words
The membrane of claim 19, wherein R is independently in each occurrence fluorine, a C 1-4 haloalkyl, or a C 1-4 alkoxy.
Claim 23
Dependent Claim
16 words
The membrane of claim 20, wherein the inherent viscosity is from about 0.25 to about 0.80.
Claim 24
Dependent Claim
20 words
The membrane of claim 21, wherein the separation factor for oxygen/nitrogen is about 3.5 or greater at 25 degrees Celsius.
Claim 25
Dependent Claim
21 words
The membrane of claim 21, wherein the separation factor for carbon dioxide/methane is about 16 or greater at 25 degrees Celsius.
Claim 26
Dependent Claim
57 words
The membrane of claim 15, wherein the membrane is comprised of a thin discriminating layer of polycarbonate corresponding to the formula: ##STR12## wherein R is independently in each occurrence hydrogen, a halogen, a C 1-6 alkyl, a C 1-6 haloalkyl, or a C 1-4 alkoxy; and n is a positive real number from about 20 or greater.
Claim 27
Dependent Claim
22 words
The membrane of claim 24, wherein R is independently in each occurrence fluorine, a C 1-6 haloalkyl, or a C 1-4 alkoxy.
Claim 28
Dependent Claim
16 words
The membrane of claim 25, wherein the inherent viscosity is from about 0.25 to about 0.80.
Claim 29
Dependent Claim
20 words
The membrane of claim 26, wherein the separation factor for oxygen/nitrogen is about 3.5 or greater at 25 degrees Celsius.
Claim 30
Dependent Claim
21 words
The membrane of claim 26, wherein the separation factor for carbon dioxide/methane is about 16 or greater at 25 degrees Celsius.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |