Patent US4772394A successfully refreshed from Google Patents.
US4772394A
Expired / Lapsed
US
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Chlorine-resistant semipermeable membranes
Assignee: Honeywell UOP LLC
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Filing: 1986-08-20
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Granted: 1988-09-20
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Expires: 2006-08-20
Abstract
Abstract Chlorine-resistant semipermeable membranes which comprise an interfacial polymerized reaction product composited on a porous support backing material may be prepared by contacting a porous support material such as polysulfone with an aqueous solution of an aromatic polyamine containing a chlorine substituent on the aromatic ring. The coated support material is then contacted with an organic solvent solution of aromatic polycarboxylic acid chloride for a period of time sufficient to form an interfacial polymerized reaction product on the surface of the support material. The resultant membrane composite may be used in separation processes such as desalination of brackish or sea water, the membrane being resistant to attack by chlorine which is present in the water.
Inventors
- 👤 Raymond J. Swedo
- 👤 Joseph J. Zupancic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:57
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/1251; B01D71/00; B01D71/06; B01D71/56; C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G69/48; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536; Y10T428/31725
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
47 words
A chlorine-resistant semipermeable membrane comprising a porous support backing material having supported thereon an interfacial polymerized condensation reaction product formed by the process of reacting together a chlorinated aromatic polyamine selected from the group consisting of 4-chloro-m-phenylenediamine, 5-chloro-m-phenylenediamine and mixtures thereof and an aromatic polycarboxylic acid chloride.
Claim 2
Dependent Claim
47 words
A chlorine-resistant semipermeable membrane comprising a porous support backing material having supported thereon an interfacial polymerized condensation reaction product formed by the process of reacting together a chlorinated aromatic polyamine selected from the group consisting of 4-chloro-m-phenylenediamine, 5-chloro-m-phenylenediamine and mixtures thereof and an aromatic polycarboxylic acid chloride.
Claim 3
Dependent Claim
32 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said polycarboxylic acid chloride is selected from the group consisting of isophthaloyl chloride, terephthaloyl chloride, trimesoyl chloride and mixtures thereof.
Claim 4
Dependent Claim
59 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said aromatic polyamine containing a chlorine substituent on the aromatic ring is present in said interfacial polymerized condensation reaction product in a weight ratio of from about 0.1:1 to about 40:1 of aromatic polyamine containing a chlorine substituent on the aromatic ring to aromatic polycarboxylic acid chloride.
Claim 5
Dependent Claim
19 words
The chlorine-resistand semipermeable membrane as set forth in claim 1 in which said porous support backing material comprises polysulfone.
Claim 6
Dependent Claim
19 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said porous support backing material comprises polycarbonate.
Claim 7
Dependent Claim
20 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said porous support backing material comprises polyphenylene ether.
Claim 8
Dependent Claim
19 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said porous support backing material comprises polyamide.
Claim 9
Dependent Claim
33 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said polyamine containing a chlorine substituent on the aromatic ring comprises 4-chloro-m-phenylenediamine and said aromatic polycarboxylic acid chloride comprises trimesoyl chloride.
Claim 10
Dependent Claim
33 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said polyamine containing a chlorine substituent on the aromatic ring comprises 5-chloro-m-phenylenediamine and said aromatic polycarboxylic acid chloride comprises trimesoyl chloride.
Claim 11
Dependent Claim
33 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said polyamine containing a chlorine substituent on the aromatic ring comprises 5-chloro-m-phenylenediamine and said aromatic polycarboxylic acid chloride comprises terephthaloyl chloride.
Claim 12
Dependent Claim
33 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said polyamine containing a chlorine substituent on the aromatic ring comprises 4-chloro-m-phenylenediamine and said aromatic polycarboxylic acid chloride comprises terephthaloyl chloride.
Claim 13
Dependent Claim
44 words
The chlorine-resistant semipermeable membrane as set forth in claim 1 in which said polyamine containing a chlorine substituent on the aromatic ring comprises a mixture of 4-chloro-m-phenylenediamine and 5-chloro-m-phenylenediamine and said aromatic polycarboxylic acid chloride comprises a mixture of trimesoyl chloride and isophthaloyl chloride.
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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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |