US4292293A
Expired / Lapsed
US
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Method for the oxidation of water-soluble sulfide compounds to higher oxidation states
Assignee: ChampionX LLC
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Filing: 1980-07-28
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Granted: 1981-09-29
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Expires: 2000-07-28
Abstract
Abstract An improved method for the oxidation of water-soluble inorganic sulfide ions in aqueous systems is disclosed. The method uses a soluble metallic ion catalyst in the presence of an oxidizing agent. The improvement comprises adding to the system a water-soluble anionically-charged polymer having a molecular weight of from 1,000-100,000. Additionally, certain organic phosphonate materials can be used in combination with the polymer. By the use of the polymer or polymer-phosphonate treatment the efficiency of the metallic ion catalyst and the sulfide oxidation step is improved.
Inventors
- 👤 Donald A. Johnson
- 👤 Baker N. Nimry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:23
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/725; C01; C01B; C01B17/00; C01B17/02; C01B17/06; C02F1/722; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/13
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
An improved method for the oxidation of water-soluble inorganic sulfide ions found in aqueous systems to higher oxidation states which method utilizes a metallic ion catalyst selected from the group consisting of nickel, cobalt, magnesium, copper and iron in the presence of an oxidizing agent selected from the group consisting of oxygen, hydrogen peroxide and chlorine, the improvement comprising adding to the aqueous system a water-soluble anionically charged polymer having a molecular weight of from 1,000-100,000 in an effective amount to improve the efficiency of the metallic ion catalyst.
Claim 2
Dependent Claim
89 words
An improved method for the oxidation of water-soluble inorganic sulfide ions found in aqueous systems to higher oxidation states which method utilizes a metallic ion catalyst selected from the group consisting of nickel, cobalt, magnesium, copper and iron in the presence of an oxidizing agent selected from the group consisting of oxygen, hydrogen peroxide and chlorine, the improvement comprising adding to the aqueous system a water-soluble anionically charged polymer having a molecular weight of from 1,000-100,000 in an effective amount to improve the efficiency of the metallic ion catalyst.
Claim 3
Dependent Claim
15 words
The improvement of claim 1 wherein the metallic iron catalyst is in the ferric state.
Claim 4
Dependent Claim
12 words
The improvement of claim 1 wherein the metallic catalyst is ferrous sulfate.
Claim 5
Dependent Claim
15 words
The improvement of claim 1 wherein the metallic iron catalyst is in the ferrous state.
Claim 6
Dependent Claim
13 words
The improvement of claim 1 wherein the oxidizing agent compound is hydrogen peroxide.
Claim 7
Dependent Claim
35 words
The improvement of claim 1 wherein the water-soluble anionically charged polymer is selected from the group consisting of polyacrylic acid, polymethacrylic acid, acrylic acid, acrylamide copolymers, acrylic acid-methylacrylate copolymers, hydrolyzed polyacrylonitrile, and water-soluble salts thereof.
Claim 8
Dependent Claim
14 words
The improvement of claim 6 wherein the water-soluble anionically charged polymer is hydrolyzed polyacrylonitrile.
Claim 9
Dependent Claim
21 words
The improvement of claim 6 wherein the water-soluble anionically charged polymer is polyacrylic acid having a molecular weight of approximately 2,100.
Claim 10
Dependent Claim
111 words
An improved method for the oxidation of water-soluble inorganic sulfide ions found in aqueous systems to higher oxidation states, which method utilizes a metallic ion catalyst selected from the group consisting of nickel, cobalt, magnesium, copper and iron in the presence of an oxidizing agent selected from the group consisting of oxygen, hydrogen peroxide and chlorine, the improvement comprising adding to the aqueous system an anionically-charged water-soluble polymer having a molecular weight of from 1,000-100,000 in combination with an organic phosphonate selected from the group consisting of amino trismethylene phosphonic acid, 1, hydroxyethyidene 1,1-diphosphonic acid, hexamethylene-diaminetetramethylene phosphonic acid, in an effective amount to improve the efficiency of the metallic ion catalyst.
Claim 11
Dependent Claim
111 words
An improved method for the oxidation of water-soluble inorganic sulfide ions found in aqueous systems to higher oxidation states, which method utilizes a metallic ion catalyst selected from the group consisting of nickel, cobalt, magnesium, copper and iron in the presence of an oxidizing agent selected from the group consisting of oxygen, hydrogen peroxide and chlorine, the improvement comprising adding to the aqueous system an anionically-charged water-soluble polymer having a molecular weight of from 1,000-100,000 in combination with an organic phosphonate selected from the group consisting of amino trismethylene phosphonic acid, 1, hydroxyethyidene 1,1-diphosphonic acid, hexamethylene-diaminetetramethylene phosphonic acid, in an effective amount to improve the efficiency of the metallic ion catalyst.
Claim 12
Dependent Claim
26 words
The method of claim 9 wherein the anionically charged water-soluble polymer and the organic phosphonate material are used at weight ratios of from 1:1 to 50:1.
Claim 13
Dependent Claim
13 words
The method of claim 9 wherein the organic phosphonate is 1,1,-hydroxyethylidene diphonphonic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |