US4537683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trihalomethane precursor removal using ion exchange emulsions
Assignee: Rohm and Haas Co
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Filing: 1983-11-18
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Granted: 1985-08-27
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Expires: 2003-11-18
Abstract
Abstract To avoid formation of toxic trihalomethanes in drinking waters disinfected with halogens, these waters are treated with fine-particle-size ion exchange resin particles, optionally in the presence of a metal salt coagulant, to remove the trihalomethane precursors prior to halogenation.
Inventors
- 👤 Eric G. Isacoff
- 👤 James W. Neely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:14
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/42; B; B01; B01J; B01J41/00; B01J41/04; B01J47/00; B01J47/014; B01J47/12; B01J47/133; C02F2303/00; C02F2303/18; C02F2303/185; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
A process for removing trihalomethane precursors from water containing said precursors which comprises treating the water, at a rate of from about 1 to about 25 milligrams of resin per liter of water, with a fine-particle-size anion exchange resin having an equilibrium parameter of K e =6×10 5 cm 3 /g or greater, a kinetic parameter of K k =6 sec -1 or greater, and a combined value of K e /10 5 +K k of about 13 to about 22, and subsequently removing the resin from the water.
Claim 2
Dependent Claim
89 words
A process for removing trihalomethane precursors from water containing said precursors which comprises treating the water, at a rate of from about 1 to about 25 milligrams of resin per liter of water, with a fine-particle-size anion exchange resin having an equilibrium parameter of K e =6×10 5 cm 3 /g or greater, a kinetic parameter of K k =6 sec -1 or greater, and a combined value of K e /10 5 +K k of about 13 to about 22, and subsequently removing the resin from the water.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the equilibrium parameter is K e =7×10 5 cm 3 /g or greater and the kinetic parameter is K k =7 sec -1 or greater.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein the water is treated with the resin at a rate of 20 milligrams or less of resin per liter of water.
Claim 5
Dependent Claim
28 words
The process of claim 2 wherein the water is treated with the resin at a rate of about 15 milligrams or less of resin per liter of water.
Claim 6
Dependent Claim
28 words
The process of claim 2 wherein the water is treated with the resin at a rate of about 10 milligrams or less of resin per liter of water.
Claim 7
Dependent Claim
15 words
The process of claim 2 wherein the resin is removed from the water by filtration.
Claim 8
Dependent Claim
26 words
The process of claim 6 wherein removing the resin by filtration is facilitated by adding to the water, prior to filtration, a fine-particle-size cation exchange resin.
Claim 9
Dependent Claim
22 words
The process of claim 2 wherein the resin is introduced to the water in the form of an aqueous emulsion or suspension.
Claim 10
Dependent Claim
25 words
The process of claim 2 wherein the resin is introduced to the water in the form of a floc with a fine-particle-size cation exchange resin.
Claim 11
Dependent Claim
21 words
The process of claim 2 wherein the water is treated with the resin in the presence of a metal salt coagulant.
Claim 12
Dependent Claim
13 words
The process of claim 10 wherein the metal salt coagulant is a clay.
Claim 13
Dependent Claim
13 words
The process of claim 10 wherein the metal salt coagulant is ferric sulfate.
Claim 14
Dependent Claim
27 words
The process of claim 10 wherein the metal salt coagulant is present in the water at a level greater than about 5 milligrams per liter of water.
Claim 15
Dependent Claim
13 words
The process of claim 2 wherein the resin is in the hydroxyl form.
Claim 16
Dependent Claim
13 words
The process of claim 2 wherein the resin is in the halide form.
References Cited (Backward Citations)
US4200695A
Cited
US4385996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |