US4595508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of sodium/ammonium alkalinity in industrial wastewater
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1984-05-07
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Granted: 1986-06-17
•
Expires: 2004-05-07
Abstract
Abstract Industrial wastewater is contacted with a weak acid cation exchange resin, in the hydrogen ion form, to substantially reduce the sodium and ammonium alkalinity levels rendering the wastewater suitable, for example, as an environmentally acceptable cooling medium.
Inventors
- 👤 Edward I. Wolfe
- 👤 David H. Wasserstrom
- 👤 Richard Kilpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:21
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/04; B01J39/07
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A process for reducing sodium and ammonium alkalinity of wastewater comprising the step of contracting said wastewater, possessing a sodium alkalinity/ammonium alkalinity greater than 1.0, and a hardness/alkalinity ratio less than 1.0, with a weak acid cation exchange resin, in hydrogen ion form, and continuing said contacting for a time sufficient to reduce the sum of said resulting sodium alkalinity and said ammonium alkalinity to about 10 mg./l as CaCO 3 or less.
Claim 2
Dependent Claim
73 words
A process for reducing sodium and ammonium alkalinity of wastewater comprising the step of contracting said wastewater, possessing a sodium alkalinity/ammonium alkalinity greater than 1.0, and a hardness/alkalinity ratio less than 1.0, with a weak acid cation exchange resin, in hydrogen ion form, and continuing said contacting for a time sufficient to reduce the sum of said resulting sodium alkalinity and said ammonium alkalinity to about 10 mg./l as CaCO 3 or less.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said sodium alkalinity is reduced by about 70%.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said ammonium alkalinity is reduced by about 80%.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said resin is an acrylic acid-divinylbenzene crosslinked copolymer.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein said wastewater is initially biologically treated and filtered to reduce the amount of organic materials present.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein said resulting wastewater is sufficient for use as makeup cooling water in an industrial process.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the resulting ammonium alkalinity is about 3 mg./l as CaCO 3 or less.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein said treated wastewater further contains about 1000 ppm or less total dissolved solids.
Claim 10
Dependent Claim
87 words
A process for reducing sodium and ammonium alkalinity in biologically treated and filtered wastewater comprising the step of contacting said wastewater, containing a sodium alkalinity/ammonium alkalinity ratio greater than 1.0 and a hardness/total alkalinity ratio less than 1.0, with a weak acid cation exchange resin in hydrogen ion form, and continuing said contacting for a time sufficient to reduce the combined sodium and ammonium alkalinity to about 10 mg/l as CaCO 3 , or less, and the ammonium alkalinity to about 3mg/l as CaCO 3 or less.
Claim 11
Dependent Claim
87 words
A process for reducing sodium and ammonium alkalinity in biologically treated and filtered wastewater comprising the step of contacting said wastewater, containing a sodium alkalinity/ammonium alkalinity ratio greater than 1.0 and a hardness/total alkalinity ratio less than 1.0, with a weak acid cation exchange resin in hydrogen ion form, and continuing said contacting for a time sufficient to reduce the combined sodium and ammonium alkalinity to about 10 mg/l as CaCO 3 , or less, and the ammonium alkalinity to about 3mg/l as CaCO 3 or less.
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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) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |