US3986951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorine-based bleachery effluent treatment
Assignee: Champion International Corp
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Filing: 1975-11-18
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Granted: 1976-10-19
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Expires: 1995-11-18
Abstract
Abstract The method of treating a chlorine-based total bleachery effluent in which only a chlorine and sodium salts are used in the bleach sequence comprising the steps of adding aluminum ion to said effluent in an amount sufficient to precipitate substantially all of the organics and suspended solids therein, separating the solids from said effluent, electrodialyzing the treated effluent to provide two effluent streams, one containing 200 to 600 parts per million sodium chloride which can be returned to the bleachery, and a second concentrated stream containing 5 to 10% by weight sodium chloride, evaporating said concentrated stream to a concentration of about 25% sodium chloride by weight, and electrolyzing said concentrated sodium chloride solution to produce chlorine gas, sodium hydroxide, and sodium hypochlorite.
Inventors
- 👤 Henry A. Fremont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; C; C02; C02F; C02F9/00; D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; B01D2311/00; B01D2311/26; B01D2311/2642; B01D2311/2649; B01D2311/2673; C02F1/00; C02F1/02; C02F1/04; C02F1/46; C02F1/461; C02F1/467; C02F1/4672; C02F1/4674; C02F1/469; C02F1/4693; C02F1/52; C02F1/5236; C02F1/5245; C02F2103/00; C02F2103/26; C02F2103/28; Y; Y10; Y10S; Y10S162/00; Y10S162/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
The method of treating a chlorine-based bleachery effluent in which only a chlorine and sodium salts are used in the bleach sequence comprising the steps of adding aluminum ion to said effluent in an amount sufficient to precipitate substantially of the organics and suspended solids therein, separating the solids from said effluent, electrodialyzing the treated effluent to provide two effluent streams, one containing 200 to 600 parts per million sodium chloride which can be returned to the bleachery, and a second concentrated stream containing 5 to 10% by weight sodium chloride, evaporating said concentrated stream to a concentration of about 25% sodium chloride by weight, and electrolyzing said concentrated sodium chloride solution to produce chlorine gas, sodium hydroxide, and sodium hypochlorite.
Claim 2
Independent Claim
121 words
The method of treating a chlorine-based bleachery effluent in which only a chlorine and sodium salts are used in the bleach sequence comprising the steps of adding aluminum ion to said effluent in an amount sufficient to precipitate substantially of the organics and suspended solids therein, separating the solids from said effluent, electrodialyzing the treated effluent to provide two effluent streams, one containing 200 to 600 parts per million sodium chloride which can be returned to the bleachery, and a second concentrated stream containing 5 to 10% by weight sodium chloride, evaporating said concentrated stream to a concentration of about 25% sodium chloride by weight, and electrolyzing said concentrated sodium chloride solution to produce chlorine gas, sodium hydroxide, and sodium hypochlorite.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the aluminum ion is added in the form of aluminum chloride in an amount sufficient to give a level of 100 to 300 ppm aluminum ion.
Claim 4
Dependent Claim
15 words
The method of claim 2 including the step of filtering the effluent prior to electrodialysis.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the bleachery effluent is the total effluent.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the bleachery effluent is one or more of the bleachery stage effluents.
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |