US4284727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating anion exchange resins
Assignee: Rhone Poulenc Nederland BV
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Filing: 1979-09-28
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Granted: 1981-08-18
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Expires: 1999-09-28
Abstract
Abstract Process for treating anion exchange resins containing a major portion of weak-base groups in catalytically inactive salt form and a minor portion of strong-base groups in catalytically inactive salt form wherein the resin is contacted with an aqueous solution containing ammonium hydroxide and ammonium chloride.
Inventors
- 👤 Eugene J. Boros
- 👤 David W. Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:07
CPC Classifications
C; C07; C07C; C07C269/00; C07C269/02; B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; B01J31/40; B01J31/4007; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A process for treating anion exchange resins containing a major portion of weak-base groups in catalytically inactive salt form and a minor portion of strong-base groups in catalytically inactive salt form which comprises contacting said ion exchange resin with an aqueous solution containing ammonium hydroxide and ammonium chloride for a time sufficient to convert said weak-base groups to their catalytically active free amine form while maintaining said strong-base groups in their catalytically inactive salt form, wherein said aqueous solution contains from about 2 to about 12 percent by weight ammonium chloride and from about 1 to about 10 percent ammonium hydroxide. PG,16
Claim 2
Dependent Claim
102 words
A process for treating anion exchange resins containing a major portion of weak-base groups in catalytically inactive salt form and a minor portion of strong-base groups in catalytically inactive salt form which comprises contacting said ion exchange resin with an aqueous solution containing ammonium hydroxide and ammonium chloride for a time sufficient to convert said weak-base groups to their catalytically active free amine form while maintaining said strong-base groups in their catalytically inactive salt form, wherein said aqueous solution contains from about 2 to about 12 percent by weight ammonium chloride and from about 1 to about 10 percent ammonium hydroxide. PG,16
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein said catalytically inactive salt form of said weak-base groups is the chloride salt form.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein said anion exchange resin has a resin skeleton consisting essentially of a solid cross-linked polymer of a vinyl aromatic composition.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein said aqueous solution contains an ammonium chloride concentration by weight in excess of said ammonium hydroxide.
Claim 6
Dependent Claim
34 words
A process according to claim 4 wherein said aqueous solution contains from about 6 to about 10 percent by weight ammonium chloride and from about 3 to about 5 percent by weight ammonium hydroxide.
References Cited (Backward Citations)
US4159930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |