Patent US4287072A successfully refreshed from Google Patents.
US4287072A
Expired / Lapsed
US
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Water treatment by ion exchange resin
Assignee: Ashland Inc
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Filing: 1979-10-18
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Granted: 1981-09-01
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Expires: 1999-10-18
Abstract
Abstract In the treatment of water by the use of a cationic and/or anionic exchange resin, catalyzed hydrazine compound is added to the feed water to alleviate the iron fouling of the ion exchange resin.
Inventors
- 👤 Jesse S. Beecher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:57
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/60
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
In a process for treating water by passing the water through an ion exchange resin, the improvement comprising: adding a catalyzed hydrazine compound to the water being treated prior to passage through the ion exchange resin in an amount effective to reduce iron fouling of the ion exchange resin; and passing the water containing said catalyzed hydrazine through the ion exchange resin to effect treatment of the water.
Claim 2
Dependent Claim
68 words
In a process for treating water by passing the water through an ion exchange resin, the improvement comprising: adding a catalyzed hydrazine compound to the water being treated prior to passage through the ion exchange resin in an amount effective to reduce iron fouling of the ion exchange resin; and passing the water containing said catalyzed hydrazine through the ion exchange resin to effect treatment of the water.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the catalyzed hydrazine compound is present in the water in an amount of at least 0.02 ppm.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein the catalyzed hydrazine compound is present in the water in an amount of at least 0.2 ppm.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the hydrazine compound is catalyzed with a quinone.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the hydrazine compound is catalyzed with an organometallic complex.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein the hydrazine compound is hydrazine and catalyzed hydrazine is present in the water in an amount of at least 0.02 ppm.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the hydrazine is catalyzed with a quinone.
Claim 9
Dependent Claim
14 words
The process of claim 6 wherein the hydrazine is catalyzed with an organometallic complex.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the water treated is a water condensate generated in a steam turbine system.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |