Patent US4695295A successfully refreshed from Google Patents.
US4695295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation membranes from polymers containing a hydrocarbon backbone and pendant (hydrocarbylamido)alkyl ester moieties
Assignee: Dow Chemical Co
•
Filing: 1986-09-24
•
Granted: 1987-09-22
•
Expires: 2006-09-24
Abstract
Abstract The invention relates to improved gas separation membranes fabricated from cyclic iminoether modified alpha-olefin/carboxylic acid copolymers. The modified membranes possess improved gas selectivities and/or permeabilities over the unmodified membranes. The membranes may be used to separate gas mixtures containing such gases as oxygen, nitrogen, methane, and carbon dioxide.
Inventors
- 👤 Linneaus C. Dorman
- 👤 Victor E. Meyer
- 👤 Marinda L. Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:10
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/76; B01D71/82; B01D71/40; C; C08; C08F; C08F8/00; C08F8/30; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
21 words
A gas separation membrane comprising a semipermeable membrane fabricated from a polymer containing a hydrocarbon backbone and pendant (hydrocarbylamido)alkyl ester moieties.
Claim 2
Dependent Claim
21 words
A gas separation membrane comprising a semipermeable membrane fabricated from a polymer containing a hydrocarbon backbone and pendant (hydrocarbylamido)alkyl ester moieties.
Claim 3
Dependent Claim
220 words
The membrane of claim 1 wherein the semipermeable membrane is fabricated from a polymer containing units in the backbone described by the formula: ##STR6## wherein R is H, an inertly substituted or unsubstituted C 1-18 alkyl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or an inertly substituted or unsubstituted C 6-14 aryl; R 1 individually in each occurrence is H, an inertly substituted or unsubstituted C 1-18 alkyl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or an inertly substituted or unsubstituted C 6-14 aryl; R 2 is H, an inertly substituted or unsubstituted C 1-18 alkyl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or an inertly substituted or unsubstituted C 6-14 aryl, or a pendant moiety of the formula --(CR 2 1 ) n COOH or of the formula --(CR 2 1 ) n COO(CH 2 ) m NHCOR 3 ; R 3 is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted C 7-30 arylalkyl; x is individually in each occurrence an integer from about 10 to about 40; y is individually in each occurrence an integer from about 1 to about 10; m is individually in each occurrence an integer from about 2 to about 7; n is individually in each occurrence an integer from 0 to about 6.
Claim 4
Dependent Claim
26 words
The membrane of claim 2 wherein x is an integer between about 15 and about 25; y is an integer between about 1 and about 6.
Claim 5
Dependent Claim
25 words
The membrane of claim 3 wherein R 3 is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted benzyl.
Claim 6
Dependent Claim
79 words
The membrane of claim 4 wherein R 1 individually in each occurrence is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted C 7-30 arylaklyl; R 2 is H, an inertly substituted or unsubstituted C 1-18 alkyl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or a pendant moiety of formula --(CR 2 1 ) n COOH or of the formula --(CR 2 1 ) n COO(CH 2 ) m NHCOR 3 .
Claim 7
Dependent Claim
24 words
The membrane of claim 5 wherein R is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted benzyl.
Claim 8
Independent Claim
120 words
A method of separating gases comprising the steps of (a) contacting with a feed gas mixture under pressure one side of a semipermeable membrane comprising a membrane fabricated from a polymer containing a hydrocarbon backbone and pendant (hydrocarbylamido)alkyl ester moieties; (b) maintaining a pressure differential across the membrane under conditions such that a component(s) of the feed gas mixture 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 9
Independent Claim
120 words
A method of separating gases comprising the steps of (a) contacting with a feed gas mixture under pressure one side of a semipermeable membrane comprising a membrane fabricated from a polymer containing a hydrocarbon backbone and pendant (hydrocarbylamido)alkyl ester moieties; (b) maintaining a pressure differential across the membrane under conditions such that a component(s) of the feed gas mixture 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 10
Dependent Claim
219 words
The method of claim 7 wherein the membrane is fabricated from a polymer containing units in the backbone described by the formula ##STR7## wherein R is H, an inertly substituted or unsubstituted C 1-18 alkyl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or an inertly substituted or unsubstituted C 6-14 aryl; R 1 individually in each occurrence is H, an inertly substituted or unsubstituted C 1-18 alkyl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or an inertly substituted or unsubstituted C 6-14 aryl; R 2 is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted C 6-14 aryl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or a pendant moiety of the formula --(CR 2 1 ) n COOH or of the formula --(CR 2 1 ) n COO(CH 2 ) m NHCOR 3 ; R 3 is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted C 7-30 arylalkyl; x is individually in each occurrence an integer from about 10 to about 40; y is individually in each occurrence an integer from about 1 to about 10; m is individually in each occurrence an integer from about 2 to about 7; n is individually in each occurrence an integer from 0 to about 6.
Claim 11
Dependent Claim
26 words
The method of claim 8 wherein x is an integer between about 15 and about 25; y is an integer between about 1 and about 6.
Claim 12
Dependent Claim
25 words
The method of claim 9 wherein R 3 is H, an inertly substituted or unsubstituted C 1-8 alkyl, or an inertly substituted or unsubstituted benzyl.
Claim 13
Dependent Claim
80 words
The method of claim 10 wherein R 1 individually in each occurrence is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted C 7-30 arylalkyl; R 2 is H, an inertly substituted or unsubstituted C 1-18 alkyl, an inertly substituted or unsubstituted C 7-30 arylalkyl, or a pendant moiety of the formula --(CR 2 1 ) n COOH or of the formula --(CR 2 1 ) n COO(CH 2 ) m NHCOR 3 .
Claim 14
Dependent Claim
24 words
The membrane of claim 11 wherein R is H, an inertly substituted or unsubstituted C 1-18 alkyl, or an inertly substituted or unsubstituted benzyl.
Claim 15
Dependent Claim
28 words
The method of claim 12 wherein the feed gas mixture contains at least one of the gases chosen from the group of oxygen, nitrogen, methane, or carbon dioxide.
Claim 16
Dependent Claim
15 words
The method of claim 13 wherein the separation factor for oxygen/nitrogen is at least 3.0.
Claim 17
Dependent Claim
21 words
The method of claim 14 wherein the pressure differential across the membrane is between about 50 psi to about 850 psi.
Claim 18
Dependent Claim
19 words
The method of claim 15 wherein the temperature is between about 0 degrees C. and about 150 degrees C.
References Cited (Backward Citations)
US3758629A
Cited
US4033731A
Cited
US4245063A
Cited
US4056502A
Cited
US4001147A
Cited
US4020230A
Cited
US4082658A
Cited
US4137385A
Cited
US4156597A
Cited
US4297449A
Cited
JPS57159505A
Cited
JPS57170910A
Cited
JPS5837024A
Cited
US4439217A
Cited
JPS58166903A
Cited
US4451619A
Cited
US4486554A
Cited
US4608419A
Cited
US4547530A
Cited
JPS60125210A
Cited
US4595707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |