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US3878208A
Expired / Lapsed
US
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Treatment of aqueous waste streams with hydrogen peroxide to remove chlorinated isocyanurates therefrom
Assignee: Olin Corp
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Filing: 1973-12-14
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Granted: 1975-04-15
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Expires: 1993-12-14
Abstract
Abstract Aqueous waste streams containing dissolved chlorinated isocyanurates and sodium chloride are contacted with hydrogen peroxide at a pH of about 0.5 to 12.0 whereby the chlorinated isocyanurates are converted to substantially insoluble cyanurate values which are separated by filtration or otherwise removed. The cyanurate values consist mainly of cyanuric acid at the lower pH range and sodium cyanurates at the upper pH range. The resulting filtrate is much lower in organics than the original waste streams. The treatment constitutes an effective pollution control measure which can operate in conjunction with existing processes of manufacturing chlorinated isocyanurate chemicals.
Inventors
- 👤 Ronald H Carlson
- 👤 Raymond N Mesiah
- 👤 Harold R Chancey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:31
CPC Classifications
C; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/36; C02; C02F; C02F1/00; C02F1/66; C02F1/72; C02F1/76; C02F2209/00; C02F2209/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
IN THE MANUFACTURE OF CHLORINATED ISOCYANURATES WHEREIN THERE IS PRODUCED AN AQUEOUS WASTE STREAM HAVING A PH OF FROM ABOUT 0.5 TO ABOUT 7.0 AND CONTAINING DISSOLVED THEREIN CHLORINATED ISOCYANURATE VALUES, A METHOD OF REMOVING SUCH CHLORINATED ISOCYANURATE VALUES FROM THE WASTE STREAMS BY TREATING SAID STREAMS WITH HYDROGEN PEROXIDE AT A PH OF FROM ABOUT 0.5 TO ABOUT 12 WHEREBY THE CHLORINATED ISOCYANURATE VALUES ARE DECHLORINATED TO PRODUCE A PRECIPITATE OF CYANURATE VALUES AND RECOVERING THE PRECIPITATED CYANURATE VALUES FROM THE SO-TREATED STREAM.
Claim 2
Dependent Claim
84 words
IN THE MANUFACTURE OF CHLORINATED ISOCYANURATES WHEREIN THERE IS PRODUCED AN AQUEOUS WASTE STREAM HAVING A PH OF FROM ABOUT 0.5 TO ABOUT 7.0 AND CONTAINING DISSOLVED THEREIN CHLORINATED ISOCYANURATE VALUES, A METHOD OF REMOVING SUCH CHLORINATED ISOCYANURATE VALUES FROM THE WASTE STREAMS BY TREATING SAID STREAMS WITH HYDROGEN PEROXIDE AT A PH OF FROM ABOUT 0.5 TO ABOUT 12 WHEREBY THE CHLORINATED ISOCYANURATE VALUES ARE DECHLORINATED TO PRODUCE A PRECIPITATE OF CYANURATE VALUES AND RECOVERING THE PRECIPITATED CYANURATE VALUES FROM THE SO-TREATED STREAM.
Claim 3
Dependent Claim
79 words
The method according to claim 1 wherein the waste stream contains a mixture of (1) a substantially acid aqueous waste stream having a pH of from about 0.5 to 5.0 and containing dissolved therein chlorinated isocyanuric acids in a combined amount of up to about 2.0 percent and (2) a substantially neutral aqueous waste stream having a pH of from about 6.5 to 7.0 and containing dissolved therein sodium dichloroisocyanurate in an amount of up to about 25 percent.
Claim 4
Dependent Claim
24 words
A method according to claim 1 wherein the chlorinated isocyanurate values are selected from the class consisting of chlorinated cyanuric acids and sodium dichloroisocyanurate.
Claim 5
Dependent Claim
47 words
A method according to claim 3 wherein the cyanurate values consist predominately of sodium cyanurate salts when the treatment is carried out at the upper part of the pH range and cyanuric acid when the treatment is carried out at the lower part of the pH range.
References Cited (Backward Citations)
US3524853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |