US4077879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sulfide-bearing waters with chlorine dioxide
Assignee: Olin Corp
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Filing: 1976-06-04
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Granted: 1978-03-07
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Expires: 1996-06-04
Abstract
Abstract The present invention is directed to a process of treating water contaminated with undesirable sulfides by adding chlorine dioxide to water in specified amounts and at specified rates of addition to oxidize the sulfides to sulfates and to simultaneously avoid or substantially retard the information of free colloidal sulfur therein. The invention is particularly useful for treating water which is or will be contaminated with petroleum oil containing undesirable sulfides, e.g., water-petroleum oil mixtures containing sulfate-reducing bacteria.
Inventors
- 👤 Carroll I. Smeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:18
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/722; Y; Y02; Y02W; Y02W10/00; Y02W10/30; Y02W10/37
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
115 words
In a process for purifying an aqueous solution containing sulfide compound contaminants wherein said aqueous solution is one in which free colloidal sulfur is formed upon treatment with a chlorine atom-containing compound, the improvement which comprises: treating said aqueous solution with chlorine dioxide by adding the chlorine dioxide: (i) in an amount of at least about 2.7 parts chlorine dioxide per part sulfides, measured on an unreacted chlorine dioxide weight basis; and (ii) at a rate of at least about 0.35 parts chlorine dioxide per part sulfides per second, so as to remove the sulfides by oxidation thereof, and so as to simultaneously substantially retard the formation of free colloidal sulfur in said aqueous solution.
Claim 2
Dependent Claim
115 words
In a process for purifying an aqueous solution containing sulfide compound contaminants wherein said aqueous solution is one in which free colloidal sulfur is formed upon treatment with a chlorine atom-containing compound, the improvement which comprises: treating said aqueous solution with chlorine dioxide by adding the chlorine dioxide: (i) in an amount of at least about 2.7 parts chlorine dioxide per part sulfides, measured on an unreacted chlorine dioxide weight basis; and (ii) at a rate of at least about 0.35 parts chlorine dioxide per part sulfides per second, so as to remove the sulfides by oxidation thereof, and so as to simultaneously substantially retard the formation of free colloidal sulfur in said aqueous solution.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said chlorine dioxide is added in an amount of at least about 3.0 parts chlorine dioxide per part sulfides.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein said chlorine dioxide is added at a rate of at least about 0.4 parts chlorine dioxide per part sulfides per second.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said chlorine dioxide is added in an amount of at least about 3.25 parts chlorine dioxide per part sulfides.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said chlorine dioxide is added in an amount of at least about 4.0 parts chlorine dioxide per part sulfides.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein said chlorine dioxide is added at a rate of at least about 0.5 parts chlorine dioxide per part sulfides per second.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein said aqueous solution contains sulfate-reducing bacteria and wherein said treating results in substantial elimination of said bacteria.
Claim 9
Dependent Claim
44 words
The process of claim 7 wherein said chlorine dioxide is added: (i) in an amount of at least about 3.0 parts chlorine dioxide per part sulfides; and (ii) at a rate of at least about 0.4 parts chlorine dioxide per part sulfides per second.
Claim 10
Dependent Claim
44 words
The process of claim 8 wherein said chlorine dioxide is added: (i) in an amount of at least about 3.25 parts chlorine dioxide per part sulfides; and (ii) at a rate of at least about 0.5 parts chlorine dioxide per part sulfides per second.
Claim 11
Dependent Claim
25 words
The process of claim 9 wherein said chlorine dioxide is added in an amount of at least about 4 parts chlorine dioxide per part sulfides.
Claim 12
Dependent Claim
25 words
The process of claim 1 wherein said aqueous solution is contaminated with petroleum oil and contains at least about 10 parts per million sulfide compounds.
Claim 13
Dependent Claim
44 words
The process of claim 11 wherein said chlorine dioxide is added: (i) in an amount of at least about 3.0 parts chlorine dioxide per part sulfides; and (ii) at a rate of at least about 0.4 parts chlorine dioxide per part sulfides per second.
Claim 14
Dependent Claim
44 words
The process of claim 12 wherein said chlorine dioxide is added: (i) in an amount of at least about 3.25 parts chlorine dioxide per part sulfides; and (ii) at a rate of at least about 0.5 parts chlorine dioxide per part sulfides per second.
Claim 15
Dependent Claim
25 words
The process of claim 13 wherein said chlorine dioxide is added in an amount of at least about 4 parts chlorine dioxide per part sulfides.
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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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |