US4758250A
Expired / Lapsed
US
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Ammonia separation using ion exchange polymeric membranes and sorbents
Assignee: University of Pittsburgh
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Filing: 1987-06-01
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Granted: 1988-07-19
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Expires: 2007-06-01
Abstract
Abstract The present invention is a process for separating ammonia from mixtures of other gases or from aqueous streams. The ammonia containing mixture is contacted with an anion exchange polymer cast into membrane form, which selectively permeates NH 3 thereby providing a separation from the other components in the mixture. Alternatively, ammonia recovery may be achieved by employing the said anion exchange polymer as a selective, reversible NH 3 sorbent.
Inventors
- 👤 Daniel V. Laciak
- 👤 Guido P. Pez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:10
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; B; B01; B01D; B01D71/00; B01D71/06; B01D71/44; B01D71/76; B01D71/82; B01J; B01J47/00; B01J47/12; C01; C01C; C01C1/00; C01C1/02; C01C1/04; C01C1/0405; C01C1/0476; C08J2339/00; C08J2339/02; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S95/00; Y10S95/90
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
66 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component, said process comprising: contacting said mixture with an anion-exchange polymer, cast into membrane form, having the general structural formula: ##STR6## where R is methyl, phenyl or hydrogen, A + is any bound cationic species, X - is any anion and n is between 10 and 10 7 .
Claim 2
Dependent Claim
66 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component, said process comprising: contacting said mixture with an anion-exchange polymer, cast into membrane form, having the general structural formula: ##STR6## where R is methyl, phenyl or hydrogen, A + is any bound cationic species, X - is any anion and n is between 10 and 10 7 .
Claim 3
Dependent Claim
15 words
A process in accordance with claim 1 wherein A + is NH 3 + .
Claim 4
Dependent Claim
49 words
A process in accordance with claim 2 wherein X - is selected from the group consisting of SeCN - , TeCN - , SCN - , I - , NO 3 - , Br - , Cl - and R'COO - where R' is H or an alkyl group.
Claim 5
Dependent Claim
24 words
A process in accordance with claim 1 wherein said polymer has the structural formula: ##STR7## wherein "n" is between 10 and 10 7 .
Claim 6
Dependent Claim
32 words
A process in accordance with claim 1 wherein the anion-exchange polymer, cast into membrane form, is in the form of a flat sheet or disc, hollow fiber, or spiral wound flat sheet.
Claim 7
Dependent Claim
18 words
A process in accordance with claim 1 wherein the anion-exchange polymer also contains one or more copolymerizable monomers.
Claim 8
Dependent Claim
33 words
A process in accordance with claim 1 wherein ammonia is separated from an ammonia synthesis plant recycle loop gas comprising NH 3 , N 2 , H 2 , CH 4 and Ar.
Claim 9
Dependent Claim
53 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component, said process comprising: contacting said mixture with an ion-exchange polymer, cast into membrane form, having the general structural formula: ##STR8## wherein X - is any anion and n is between 10 and 10 7 .
Claim 10
Dependent Claim
53 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component, said process comprising: contacting said mixture with an ion-exchange polymer, cast into membrane form, having the general structural formula: ##STR8## wherein X - is any anion and n is between 10 and 10 7 .
Claim 11
Dependent Claim
49 words
A process in accordance with claim 8 wherein X - is selected from the group consisting of SeCN - , TeCN - , SCN - , I - , NO 3 - , Br - , Cl - and R'COO - where R' is H or an alkyl group.
Claim 12
Dependent Claim
38 words
A process in accordance with claim 8 wherein the anion-exchange polymer active element is present in an encapsulated form within a flat sheet, disc, spiral wound sheet membrane or encapsulated within the walls of a hollow fiber membrane.
Claim 13
Dependent Claim
28 words
A process in accordance with claim 8 wherein the membrane is in the form of a flat sheet or disc, a spiral wound sheet or a hollow fiber.
Claim 14
Dependent Claim
38 words
A process in accordance with claim 11 wherein the anion-exchange polymer active element is present in an encapsulated form within a flat sheet, disc, spiral wound sheet membrane or encapsulated within the walls of a hollow fiber membrane.
Claim 15
Dependent Claim
73 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component comprising: contacting said mixture with an anion exchange polymer, having the general structural formula: ##STR9## where R is methyl phenyl or hydrogen, A + is any bound cationic species, X - is any anion and n is between 10 and 10 7 , such that said polymer selectively and reversibly sorbs ammonia from the mixture.
Claim 16
Dependent Claim
73 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component comprising: contacting said mixture with an anion exchange polymer, having the general structural formula: ##STR9## where R is methyl phenyl or hydrogen, A + is any bound cationic species, X - is any anion and n is between 10 and 10 7 , such that said polymer selectively and reversibly sorbs ammonia from the mixture.
Claim 17
Dependent Claim
15 words
A process in accordance with claim 13 wherein A + is NH 3 + .
Claim 18
Dependent Claim
50 words
A process in accordance with claim 13 wherein X - is selected from the group consisting of SeCN - , TeCN - , SCN - , I - , NO 3 31 3, Br - , Cl - and R'COO - where R' is H or an alkyl hydrocarbon chain.
Claim 19
Dependent Claim
24 words
A process in accordance with claim 13 wherein said polymer has the structural formula: ##STR10## wherein n is between 10 and 10 7 .
Claim 20
Dependent Claim
28 words
A process of claim 13 wherein the ammonia is desorbed by lowering the ammonia pressure, heating the polymer containing the absorbed ammonia or a combination of the two.
Claim 21
Dependent Claim
24 words
A process in accordance with claim 13 wherein the said polymer is contained or encapsulated within a relatively gas permeable but water insoluble polymer.
Claim 22
Dependent Claim
60 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component comprising: contacting said mixture with an anion exchange polymer, having the general structural formula: ##STR11## wherein X - is any anion and n is between 10 and 10 7 , such that said polymer selectively and reversibly sorbs ammonia from the mixture.
Claim 23
Dependent Claim
60 words
A process for separating ammonia from a mixture of gases containing ammonia and at least one other component comprising: contacting said mixture with an anion exchange polymer, having the general structural formula: ##STR11## wherein X - is any anion and n is between 10 and 10 7 , such that said polymer selectively and reversibly sorbs ammonia from the mixture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |